WO2024014675A1 - 세탁기 및 세탁기의 제어방법 - Google Patents
세탁기 및 세탁기의 제어방법 Download PDFInfo
- Publication number
- WO2024014675A1 WO2024014675A1 PCT/KR2023/006151 KR2023006151W WO2024014675A1 WO 2024014675 A1 WO2024014675 A1 WO 2024014675A1 KR 2023006151 W KR2023006151 W KR 2023006151W WO 2024014675 A1 WO2024014675 A1 WO 2024014675A1
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- WO
- WIPO (PCT)
- Prior art keywords
- coil
- tub
- damper
- voltage
- vibration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
- D06F37/20—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations
- D06F37/22—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations in machines with a receptacle rotating or oscillating about a horizontal axis
- D06F37/225—Damping vibrations by displacing, supplying or ejecting a material, e.g. liquid, into or from counterbalancing pockets
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F33/00—Control of operations performed in washing machines or washer-dryers
- D06F33/30—Control of washing machines characterised by the purpose or target of the control
- D06F33/48—Preventing or reducing imbalance or noise
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
- D06F37/20—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations
- D06F37/22—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations in machines with a receptacle rotating or oscillating about a horizontal axis
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00
- D06F39/12—Casings; Tubs
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00
- D06F39/12—Casings; Tubs
- D06F39/125—Supporting arrangements for the casing, e.g. rollers or legs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
- F16F9/535—Magnetorheological [MR] fluid dampers
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/26—Imbalance; Noise level
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/44—Current or voltage
Definitions
- the disclosed invention relates to a washing machine and a control method of the washing machine, and more specifically, to a washing machine and a control method of the washing machine that reduce vibration of the tub using a magnetic damper.
- a washing machine may include a tub that accommodates water for washing, and a drum rotatably installed within the tub. Additionally, a washing machine can wash laundry by rotating a drum containing the laundry.
- the washing machine may perform a washing cycle including a washing cycle for washing laundry, a rinsing cycle for rinsing the washed laundry, and a dehydration cycle for dehydrating the laundry.
- the tub When a washing machine performs a washing cycle, the tub may vibrate according to the rotation of the drum.
- the washing machine may include a damper to support the tub and at the same time attenuate vibration and vibration occurring in the tub.
- the magnetorheological fluid changes viscosity in response to a magnetic field, and the damping force may change depending on the change in viscosity.
- magnetorheological fluid Since magnetorheological fluid is expensive, a method that can efficiently use a small amount of magnetorheological fluid would be advantageous.
- One aspect of the disclosed invention provides a washing machine and a control method for the washing machine that can efficiently control the damping force of an electromagnetic damper.
- a washing machine includes a cabinet; a tub disposed within the cabinet; a drum rotatably provided inside the tub; At least one damper coupled to the cabinet and the tub, the damper including a magneto-rheological fluid whose viscosity changes depending on a magnetic field, and at least one coil that generates the magnetic field; and the at least one coil based on the rotational speed of the drum and the vibration value of the tub to generate the magnetic field to change the viscosity of the magnetorheological fluid to reduce vibration of the tub due to rotation of the drum. It may include a control unit that controls the voltage applied to the.
- control unit adjusts the duty ratio of the voltage applied to the at least one coil to a first value based on the vibration value of the tub being less than the reference value, and adjusting the duty ratio of the voltage applied to the at least one coil to the first value based on the vibration value of the tub being greater than the reference value.
- the duty ratio of the voltage applied to the at least one coil can be adjusted to a second value greater than the first value.
- control unit adjusts the duty ratio of the voltage applied to the at least one coil based on a first look-up table in the first section of the washing machine stroke in which the drum accelerates from the first speed to the second speed, In the second section of the washing machine stroke in which the drum accelerates from the second speed to the third speed, the duty ratio of the voltage applied to the at least one coil may be adjusted based on a second look-up table that is different from the first look-up table.
- the at least one coil may include: a first coil receiving a first voltage from a first power source; and a second coil that receives a second voltage from a second power source, wherein the control unit controls each of the first coil and the second coil based on the rotational speed of the drum and the vibration value of the tub. 1 voltage and the second voltage can be selectively applied.
- control unit applies the first voltage to the first coil based on the vibration value of the tub falling within the first reference range, and the control unit applies the first voltage to the first coil based on the vibration value of the tub falling within the second reference range.
- the second voltage is applied to the second coil, and the first voltage and the second voltage are applied to the first coil and the second coil, respectively, based on the vibration value of the tub falling within a third reference range. You can.
- the at least one damper includes: at least one front damper including a first coil and disposed closer to the front of the front and rear of the tub; and at least one rear damper that includes a second coil and is disposed closer to the rear of the front and rear of the tub, wherein the control unit controls a washing machine stroke in which the drum accelerates from a first speed to a second speed.
- the voltage applied to the first coil and the second coil is controlled so that the damping force of the rear damper is greater than the damping force of the front damper, and the drum accelerates from the second speed to the third speed.
- the voltage applied to the first coil and the second coil may be controlled so that the damping force of the front damper is greater than the damping force of the rear damper in the second section of the washing machine stroke.
- the washing machine further includes a vibration sensor that detects a vibration value of the tub, and the at least one damper includes a first coil, and at least one damper is disposed closer to the front of the front and rear of the tub. front damper; and at least one rear damper, which includes a second coil and is disposed closer to the rear of the front and rear of the tub, wherein the control unit controls the vibration of the tub based on the vibration value of the tub detected by the vibration sensor. Determine a first vibration value occurring at the front and a second vibration value occurring at the back of the tub, control the voltage applied to the first coil based on the first vibration value, and adjust the second vibration value to the first vibration value. Based on this, the voltage applied to the second coil can be controlled.
- control unit adjusts the voltage applied to the first coil and the second coil so that the damping force of the front damper is greater than the damping force of the rear damper based on the fact that the first vibration value is greater than the second vibration value. and control the voltage applied to the first coil and the second coil so that the damping force of the rear damper is greater than the damping force of the front damper based on the fact that the second vibration value is greater than the first vibration value.
- control unit adjusts the duty ratio of the voltage applied to the first coil to be higher than the duty ratio of the voltage applied to the second coil so that the damping force of the front damper is greater than the damping force of the rear damper, and the control unit adjusts the duty ratio of the voltage applied to the first coil to be higher than the duty ratio of the voltage applied to the second coil.
- the duty ratio of the voltage applied to the second coil may be adjusted to be higher than the duty ratio of the voltage applied to the first coil so that the damping force of the damper is greater than the damping force of the front damper.
- a method of controlling a washing machine includes a magneto-rheological fluid whose viscosity changes depending on a magnetic field, at least one coil generating the magnetic field, and at least one coupled to a cabinet and a tub.
- a magneto-rheological fluid whose viscosity changes depending on a magnetic field
- at least one coil generating the magnetic field and at least one coupled to a cabinet and a tub.
- the control method of a washing machine including one damper to generate the magnetic field to reduce vibration of the tub due to rotation of the drum by changing the viscosity of the magnetorheological fluid, It may include controlling the voltage applied to the at least one coil based on the vibration value of the tub.
- controlling the voltage applied to the at least one coil may include adjusting the duty ratio of the voltage applied to the at least one coil to a first value based on the vibration value of the tub being less than a reference value; It may include adjusting the duty ratio of the voltage applied to the at least one coil to a second value greater than the first value based on the vibration value of the tub being greater than the reference value.
- the voltage applied to the at least one coil is controlled by applying the voltage to the at least one coil based on a first lookup table in a first section of the washing machine stroke in which the drum accelerates from the first speed to the second speed. adjusting the duty ratio of the voltage; In the second section of the washing machine stroke in which the drum accelerates from the second speed to the third speed, the duty ratio of the voltage applied to the at least one coil is adjusted based on a second look-up table that is different from the first look-up table. It may include;
- the at least one coil may include: a first coil receiving a first voltage from a first power source; and a second coil receiving a second voltage from a second power source, wherein the voltage applied to the at least one coil is controlled based on the rotational speed of the drum and the vibration value of the tub. It may include selectively applying the first voltage and the second voltage to each of the coil and the second coil.
- selectively applying the first voltage and the second voltage to each of the first coil and the second coil is based on the fact that the vibration value of the tub falls within the first reference range. apply a first voltage; applying the second voltage to the second coil based on the vibration value of the tub falling within a second reference range; It may include applying the first voltage and the second voltage to the first coil and the second coil, respectively, based on the vibration value of the tub falling within a third reference range.
- the at least one damper includes: at least one front damper including a first coil and disposed closer to the front of the front and rear of the tub; and at least one rear damper, which includes a second coil and is disposed closer to the rear of the front and rear of the tub.
- Controlling the voltage applied to the at least one coil includes: controlling the voltage applied to the at least one coil, controlling the voltage applied to the first coil and the second coil so that the damping force of the rear damper is greater than the damping force of the front damper in the first section of the washing machine stroke accelerated at a second speed; In the second section of the washing machine stroke in which the drum accelerates from the second speed to the third speed, the voltage applied to the first coil and the second coil is adjusted so that the damping force of the front damper is greater than the damping force of the rear damper. It may include controlling;
- the washing machine further includes a vibration sensor that detects a vibration value of the tub, and the at least one damper includes a first coil, and at least one damper is disposed closer to the front of the front and rear of the tub. front damper; and at least one rear damper, which includes a second coil and is disposed closer to the rear of the front and rear of the tub.
- Controlling the voltage applied to the at least one coil comprises: a voltage detected from the vibration sensor; determining a first vibration value occurring at the front of the tub and a second vibration value occurring at the rear of the tub based on the vibration value of the tub; Controlling the voltage applied to the first coil based on the first vibration value; It may include controlling the voltage applied to the second coil based on the second vibration value.
- controlling the voltage applied to the at least one coil may include controlling the voltage applied to the at least one coil so that the damping force of the front damper is greater than the damping force of the rear damper based on the first vibration value being greater than the second vibration value. and controlling the voltage applied to the second coil; Controlling the voltage applied to the first coil and the second coil so that the damping force of the rear damper is greater than the damping force of the front damper based on the second vibration value being greater than the first vibration value. can do.
- controlling the voltage applied to the first coil and the second coil so that the damping force of the front damper is greater than the damping force of the rear damper is to adjust the duty ratio of the voltage applied to the first coil to the second coil. and controlling the voltage applied to the first coil and the second coil so that the damping force of the rear damper is greater than the damping force of the front damper. It may include adjusting the duty ratio of the voltage applied to the second coil to be higher than the duty ratio of the voltage applied to the first coil.
- the damper includes a piston; and a cylinder in which an internal space is formed so that the piston can move inside, a cylinder including a yoke and a bobbin disposed on one side of the yoke, wherein the magnetorheological fluid is applied to the outer surface of the piston and the cylinder. It is accommodated in the receiving space between the inner surface of the, the at least one coil is wound around the bobbin, and the thickness of the magnetorheological fluid disposed between the piston and the bobbin is the magnetic flux disposed between the piston and the yoke. It may be thinner than the thickness of the rheological fluid.
- an electromagnetic damper with excellent damping performance compared to the amount of magnetorheological fluid can be provided.
- the damping force of the electromagnetic damper can be efficiently controlled by considering the ongoing stroke and the vibration value of the tub.
- a washing machine with reduced vibration of the tub can be provided.
- the damping force of the electromagnetic damper is controlled based on the amount of vibration of the tub, and in a normal section in which a relatively small vibration occurs in the tub, the damping force of the electromagnetic damper is lowered. By controlling this, you can minimize the noise generated by the washing machine.
- the damping force of the electromagnetic damper can be controlled in stages.
- FIG. 1 is a perspective view showing a washing machine according to an embodiment of the present disclosure.
- FIG. 2 is a perspective view showing some components of a washing machine according to an embodiment of the present disclosure shown in FIG. 1.
- Figure 3 is a perspective view of a damper in the washing machine according to an embodiment of the present disclosure shown in Figure 2.
- Figure 4 is an exploded perspective view of the damper according to an embodiment of the present disclosure shown in Figure 3.
- Figure 5 is an exploded perspective view showing some components of the damper according to an embodiment of the present disclosure shown in Figure 4.
- FIG. 6 is a cross-sectional view of the damper according to an embodiment of the present disclosure shown in FIG. 3.
- FIG. 7 is a cross-sectional view of the damper according to an embodiment of the present disclosure shown in FIG. 3.
- Figure 8 is a cross-sectional view of a damper in a washing machine according to an embodiment of the present disclosure.
- Figure 9 is a cross-sectional view of a damper in a washing machine according to an embodiment of the present disclosure.
- Figure 10 is a block diagram showing the configuration of a washing machine according to an embodiment of the present disclosure.
- Figure 11 is a flowchart showing an example of a washing machine control method according to an embodiment of the present disclosure.
- Figure 12 shows an example of a drum speed profile of a washing machine according to an embodiment of the present disclosure.
- FIG. 13 shows an example of a lookup table for controlling the damping force of a damper based on the vibration value of the tub, according to an embodiment of the present disclosure.
- Figure 14 is a block diagram showing the configuration of a washing machine according to another embodiment of the present disclosure.
- Figure 15 shows another example of a lookup table for controlling the damping force of the damper based on the vibration value of the tub, according to an embodiment of the present disclosure.
- Figure 16 is a block diagram showing the configuration of a washing machine according to another embodiment of the present disclosure.
- Figure 17 shows another example of a lookup table for controlling the damping force of the damper based on the vibration value of the tub, according to an embodiment of the present disclosure.
- Figure 18 shows an example of the amount of vibration occurring at the front of the tub according to an embodiment of the present disclosure.
- Figure 19 shows an example of the amount of vibration occurring at the rear of the tub according to an embodiment of the present disclosure.
- Figure 20 shows an example of the duty ratio of the voltage applied to the front damper and the rear damper according to an embodiment of the present disclosure.
- ⁇ unit may refer to a unit that processes at least one function or operation.
- the terms may mean at least one piece of hardware such as a field-programmable gate array (FPGA)/application specific integrated circuit (ASIC), at least one software stored in memory, or at least one process processed by a processor. there is.
- FPGA field-programmable gate array
- ASIC application specific integrated circuit
- a washing machine includes a vortex type washing machine in which a pulsator provided inside a drum rotates to generate a water current and laundry is washed by the generated water current, and a lifter formed on the inner peripheral surface of the drum lifts the laundry and then drops it. It is classified as a drum-type washing machine that washes laundry by washing it.
- FIG. 1 is a perspective view showing a washing machine according to an embodiment of the present disclosure.
- FIG. 2 is a perspective view showing some components of the washing machine shown in FIG. 1.
- a washing machine 1 may include a washing machine 1 .
- the washing machine (1) includes a cabinet (10) forming the exterior, a tub (12) installed inside the cabinet (10) and storing washing water, and rotatably installed inside the tub (12), with a plurality of fixtures on the wall. It includes a cylindrical drum 11 in which dehydration holes are formed.
- the cabinet 10 is provided in an approximately hexahedral shape.
- the cabinet 10 may include a front (10a) and a rear (not shown), side surfaces (10b), a top (10c), and a bottom plate (10d) forming the bottom.
- the front 10a of the cabinet 10 may be the front panel 10a.
- An opening 13 may be formed in the front 10a of the cabinet 10 to allow laundry to be put in or taken out. Openings are formed in the tub 12 and the drum 11 to allow laundry to be put in or taken out from the front of the cabinet 10, and the openings of the tub 12 and the drum 11 are connected to the opening 13 of the front 10a. It can be positioned correspondingly.
- a door 20 is installed in the opening 13 of the cabinet 10 to open and close the openings of the tub 12 and the drum 11.
- a control panel 14 may be provided on the upper part of the front 10a of the cabinet 10 to control the operation of the washing machine 1.
- the control panel 14 may be a component included in the front panel 10a.
- the control panel 14 may include a display unit that displays washing settings and/or washing operation information in response to user input, and an input unit that receives user input.
- the control panel 14 may provide a user interface for interaction between a user and the washing machine.
- the input unit may include, for example, a power button, an operation button, a course selection dial, and a detailed settings button. Additionally, the input unit may be provided as a tact switch, push switch, slide switch, toggle switch, micro switch, or touch switch.
- the display unit may include a screen displaying various information and an indicator displaying detailed settings selected by a setting button.
- the display unit may include, for example, a liquid crystal display (LCD) panel and/or a light emitting diode (LED).
- LCD liquid crystal display
- LED light emitting diode
- the washing course of the washing machine 1 has predetermined administrative conditions ( For example, washing temperature, number of rinses, spin strength) may be included.
- a standard wash cycle may include general wash conditions for laundry.
- the blanket washing course may include administrative conditions optimized for washing the blanket.
- the washing course includes various courses such as standard washing, power washing, wool washing, blanket washing, general clothes washing, baby clothes washing, towel washing, small quantity washing, boiling washing, power saving washing, outdoor washing, rinsing + spin, and spin. can do.
- a driving unit (not shown) may be provided at the rear of the drum 11.
- the drive unit is configured to rotate the drum 11, and may be provided to rotate the drum 11 by transmitting the driving force generated by the motor to the rotation shaft.
- the drive unit may include a motor and a drive circuit.
- the drive circuit may supply a drive current to drive the motor in response to a drive signal (motor control signal).
- the driving circuit may rectify alternating current power from an external power source and convert it into direct current power, and convert the direct current power into driving power in the form of a sinusoidal wave.
- the driving circuit may include an inverter that outputs the converted driving power to the motor.
- the inverter may include a plurality of switching elements and may open (off) or close (on) the plurality of switches based on a driving signal.
- Drive current may be supplied to the motor depending on the opening or closing of the switching elements.
- the driving circuit may include a current sensor capable of measuring the driving current output from the inverter.
- a water supply valve (not shown) and water supply pipes that control water supply may be provided on the tub 12.
- a detergent supply device 30 may be installed on the tub 12 to supply detergent into the tub 12 during the water supply process.
- a drainage device including a drain pipe (not shown) and a drain valve (not shown) for draining water inside the tub 12 may be installed below the tub 12.
- the front, rear, side sides, top, and bottom forming the cabinet 10 are shown as examples of being separately prepared and assembled, but the present disclosure is not limited thereto.
- at least a portion of the front, rear, both sides, top, and bottom of the cabinet 10 may be formed as one body.
- the tub 12 can be elastically supported from the cabinet 10 by a spring (not shown) provided above and vibration reduction devices 100 provided below.
- the vibration reduction device 100 may be referred to as a damper 100.
- the spring and damper 100 transmit vibration energy between the tub 12 and the cabinet 10 when the vibration generated when the drum 11 rotates is transmitted to the tub 12 and the cabinet 10. Vibration transmitted to the cabinet 10 can be attenuated by absorption.
- a plurality of dampers 100 supporting the lower portion of the tub 12 may be provided. For example, there may be four dampers 100 supporting the tub 12.
- the plurality of dampers 100 include a portion of the bottom surface of the cabinet 10 close to the front of the tub 12 and at least one first damper 100-1 coupled to the tub 12, and a portion of the cabinet 10. It may include a portion of the bottom surface close to the rear of the tub 12 and at least one second damper 100-2 coupled to the tub 12.
- At least one first damper 100-1 is disposed closer to the front of the front and rear of the tub 12, and can effectively attenuate vibration occurring at the front of the tub 12, and at least one first damper 100-1 is disposed closer to the front of the tub 12.
- the second damper 100-2 is disposed closer to the rear of the tub 12 and can effectively attenuate vibration occurring at the rear of the tub 12.
- At least one first damper 100-1 may be called a front damper, and at least one second damper 100-2 may be called a rear damper.
- At least one first damper (100-1) is a 1-1 damper (100-1a) coupled to the left portion of the bottom surface of the cabinet 10 and the tub 12, and the right side of the bottom surface of the cabinet 10. It may include a first-second damper (100-1b) coupled to the portion and the tub (12).
- At least one second damper (100-2) is a 2-1 damper (100-2a) coupled to the left portion of the bottom surface of the cabinet 10 and the tub 12, and the right side of the bottom surface of the cabinet 10. It may include a 2-2 damper (100-2b) coupled to the portion and the tub (12).
- the 1-1 damper 100-1a may be coupled to the front left corner of the bottom of the cabinet 10, and the 1-2 damper 100-1b may be coupled to the bottom of the cabinet 10. It may be coupled to the front right corner of the surface, and the 2-1 damper (100-2a) may be coupled to the rear left corner of the bottom surface of the cabinet 10, and the 2-2 damper (100-2b) ) may be coupled to the rear right corner of the bottom surface of the cabinet 10.
- the damper 100 can prevent the vibration and vibration of the tub 12 generated during the washing process from being transmitted to the cabinet 10.
- the damper 100 may include a first fixing part 101 formed at the top and a second fixing part 102 formed at the bottom.
- a damper coupling portion 12a that can be coupled to the top of the dampers 100 may be provided on the outer surface of the tub 12.
- the first fixing part 101 of the damper 100 may be supported on the damper fixing part 12a of the tub 12.
- the damper fixing part 12a of the tub 12 may be provided to correspond to the first fixing part 201 of the damper 100.
- the second fixing part 102 of the damper 100 may be supported on the damper fixing part 10e formed on the bottom plate 10d.
- first fixing part 101 is shown at the top of the damper 100
- second fixing part 102 is shown at the bottom of the damper 100, but they are not limited thereto.
- first fixing part 101 may be provided at the bottom of the damper 100
- second fixing part 102 may be provided at the top of the damper 100.
- Figure 3 is a perspective view of the damper in the washing machine shown in Figure 2.
- Figure 4 is an exploded perspective view of the damper shown in Figure 3.
- Figure 5 is an exploded perspective view showing some components of the damper shown in Figure 4.
- the washing machine 1 may include a damper 100.
- the damper 100 may include a piston 120, a cylinder 100a, and a friction member 160.
- Piston 120 may extend in one direction.
- the piston 120 may be provided to be movable inside the cylinder 100a.
- Piston 120 may be referred to as rod 120.
- the vibration of the tub 12 may be damped by friction between the piston 120 and the cylinder 100a, which occurs as the piston 120 moves forward and backward in the inner space 100b of the cylinder 100a. .
- a second fixing part 102 may be provided at one end of the piston 120.
- the second fixing part 102 may be formed at one end of the piston 120 that is not inserted into the internal space 100b of the cylinder 100a.
- the second fixing part 102 may be fixed to the bottom plate. However, it is not limited to this, and it is possible for the second fixing part 102 to be fixed to the tub 12.
- the cylinder 100a can accommodate the piston 120 and allow the piston 120 to advance and retreat within the cylinder 100a.
- the cylinder 100a may include an internal space 100b.
- the internal space 100b may be formed inside the cylinder 100a.
- the cylinder 100a may be provided to surround the piston 120.
- the cylinder 100a may further include a case 110.
- Case 110 may form the exterior of the cylinder 100a.
- Case 110 may be referred to as cylinder case 110.
- a plurality of cases 110 may be provided.
- the plurality of cases 110 include a first case 111, a second case 112, a third case 113, a fourth case 114, a fifth case 115, and It may include a sixth case (116).
- the first case 111, the second case 112, the third case 113, the fourth case 114, the fifth case 115, and the sixth case 116 are formed in various ways. can be combined
- the first case 111, the second case 112, the third case 113, the fourth case 114, the fifth case 115, and the sixth case 116 are It can be welded or screwed, and it is also possible to bend a part of each case 110 and insert it into another case 110 to be joined.
- first case 111, the second case 112, the third case 113, the fourth case 114, the fifth case 115, and the sixth case 116 are separate Although shown as a component, it is not limited thereto and includes a first case 111, a second case 112, a third case 113, a fourth case 114, a fifth case 115, and The sixth case 116 can also be formed integrally.
- the first case 111 may be placed at one end of the cylinder case 110.
- the first case 111 may be combined with the second case 112.
- a first fixing part 101 may be formed at one end of the first case 111.
- the first case 111 may accommodate a portion of the piston 120 therein.
- the second case 112 may be combined with the first case 111.
- the second case 112 may cover a portion of the third case 113 and the piston 120.
- the piston 120 may penetrate the hollow portion 112a of the second case 112.
- the third case 113 may be combined with the second case 112 and the fourth case 114.
- the third case 113 covers a portion of the piston 120 and can accommodate the sealing member 170.
- the piston 120 may penetrate the hollow portion 113a of the third case 113.
- the fourth case 114 may be combined with the second case 112 or the fifth case 115.
- the fourth case 114 may include a receiving space 114a and a guide hole 114b.
- the fourth case 114 may cover the bobbin 140, the yoke 130, and the piston 120.
- the bobbin 140, yoke 130, and piston 120 can be accommodated in the receiving space 114a.
- the guide hole 114b may guide the coil 150 as it is wound around the bobbin 140, which will be described later.
- the guide hole 114b may extend from one end of the wall of the fourth case 114.
- the fifth case 115 may be combined with the fourth case 114 and the sixth case 116.
- the fifth case 115 covers a portion of the piston 120 and can accommodate the sealing member 170.
- the piston 120 may penetrate the hollow portion 115a of the fifth case 115.
- the sixth case 116 may be placed at the other end of the cylinder case 110.
- the sixth case 116 may be combined with the fifth case 115.
- the sixth case 116 can accommodate a portion of the piston 120 therein.
- the piston 120 may penetrate the hollow portion 116a of the sixth case 116.
- the cylinder 100a may further include a yoke 130 and a bobbin 140.
- the yoke 130 may interact with the friction member 160 containing magnetorheological fluid, which will be described later. Friction may occur between the cylinder 100a and the piston 120 due to the interaction between the yoke 130 and the magnetorheological fluid.
- the yoke 130 may be a magnetic material.
- the yoke 130 may be hollow to form the internal space 100b of the cylinder 100a.
- the yoke 130 may include a hollow portion 133.
- the hollow portion 133 may be formed by the inner surface 131.
- the hollow portion 133 may be referred to as the internal space 133 of the yoke 130.
- the internal space 100b of the cylinder 100a may include the hollow portion 133 of the yoke 130.
- the piston 120 may be accommodated and/or inserted into the hollow portion 133.
- the yokes 130 may be provided in plural numbers.
- the plurality of yokes 130 may include a first yoke 130a, a second yoke 130b, a third yoke 130c, and a fourth yoke 130d.
- a bobbin 140 may be disposed between the plurality of yokes 130.
- the first bobbin (140a) is disposed between the first yoke (130a) and the second yoke (130b), and the second bobbin (140a) is disposed between the second yoke (130b) and the third yoke (130c) 140b) may be disposed, and a third bobbin 140c may be disposed between the third yoke 130c and the fourth yoke 130d.
- the yoke 130 may further include a coil guide 132 and a coupling protrusion (not shown).
- the coil guide 132 may guide the coil 150 wound on the bobbin 140.
- the coil guide 132 may be recessed inward from the outer peripheral surface of the yoke 130 along the radial direction of the yoke 130 and/or the cylinder 100a.
- the coupling protrusion may couple the bobbin 140 and the yoke 130.
- the bobbin 140 and the yoke 130 may be coupled to each other due to a coupling portion formed on the bobbin 140 and a coupling protrusion formed on the yoke 130.
- the coil guide 132 is shown only on the second yoke 130b and the third yoke 130c, but the formation position of the coil guide 132 is not limited thereto. Additionally, the coil guide 132 and the coupling protrusion may be optional components. For example, the coil guide 132 and the coupling protrusion may be omitted.
- the bobbin 140 may be disposed between the plurality of yokes 130 to space the plurality of yokes 130 apart.
- a coil 150 may be wound around the bobbin 140.
- the coil 150 may be wound around the extension portion 147 of the bobbin 140 (see FIG. 6).
- the bobbin 140 may be a non-magnetic material.
- the bobbin 140 may be an injection molded plastic product.
- the bobbin 140 may be hollow to form the internal space 100b of the cylinder 100a.
- the bobbin 140 may include a hollow portion 145.
- the hollow portion 145 may be formed by the inner surface 141.
- the hollow portion 145 may be referred to as the internal space 145 of the bobbin 140.
- the internal space 100b of the cylinder 100a may include the hollow portion 145 of the bobbin 140.
- the piston 120 may be accommodated and/or inserted into the hollow portion 145.
- a plurality of bobbins 140 may be provided.
- the plurality of bobbins 140 may include a first bobbin 140a, a second bobbin 140b, and a third bobbin 140c.
- Each of the plurality of bobbins 140 may be disposed between the plurality of yokes 130.
- the bobbin 140 may further include a radius protrusion 142.
- the radial protrusion 142 may protrude along the radial direction from the inner surface 141 forming the hollow portion 145 of the bobbin 140.
- the radius protrusion 142 may protrude toward the center of the hollow portion 145.
- the inner surface 141 of the bobbin 140 on which the radius projections 142 are not formed are Less friction members 160 can be accommodated between the pistons 120. Details will be described later.
- the bobbin 140 may further include a coil guide 144.
- the coil guide 144 may guide the coil 150 wound around the outer periphery of the extension portion 147.
- the coil guide 144 may be recessed inward from the outer peripheral surface of the support plate 146 along the radial direction of the bobbin 140 and/or the cylinder 100a (see FIG. 6).
- the bobbin 140 may further include a coupling portion.
- the coupling portion may couple the bobbin 140 and the yoke 130.
- the bobbin 140 and the yoke 130 may be coupled to each other due to a coupling portion formed on the bobbin 140 and a coupling protrusion formed on the yoke 130.
- the bobbin 140 may include a through hole or groove.
- the radius protrusion 142, the coil guide 144, and the coupling portion may be optional components.
- the radius protrusion 142, the coil guide 144, and the coupling portion may be omitted.
- the friction member 160 may include magnetorheological fluid. Details will be described later.
- Figure 6 is a cross-sectional view of the damper shown in Figure 3.
- Figure 7 is a cross-sectional view of the damper shown in Figure 3.
- the washing machine 1 may include a damper 100.
- the damper 100 may include a cylinder 100a, a piston 120, a coil 150, and a friction member 160.
- the cylinder 100a may include a bobbin 140 and a yoke 130.
- the bobbin 140 may include a support plate 146, an extension portion 147, and a radius protrusion 142.
- the support plate 146 may be disposed between the plurality of yokes 130 to support the plurality of yokes 130.
- a plurality of support plates 146 may be provided.
- the first support plate 146a supports the yoke 130 by contacting the yoke 130 disposed on one side of the bobbin 140 along the longitudinal direction (and/or extension direction) of the piston 120.
- the second support plate 146b may support the yoke 130 by contacting the yoke 130 disposed on the other side of the bobbin 140 along the longitudinal direction of the piston 120.
- Support plate 146 may be referred to as contact plate 146.
- the extension portion 147 may be disposed between the plurality of support plates 146.
- the extension portion 147 may be disposed between the first support plate 146a and the second support plate 146b and extend along the longitudinal direction (and/or extension direction) of the piston 120.
- the radius R2 of the extension portion 147 may be set to be smaller than the radius R1 of the support plate 146.
- the extension portion 147 may connect the middle portions of the plurality of support plates 146.
- a coil 150 may be wound around the outer peripheral surface of the extension portion 147.
- the radius protrusion 142 may protrude from the inner surface 141 of the bobbin 140 toward the piston 120.
- the radial protrusion 142 may protrude from the inner surface 141 of the bobbin 140 toward the hollow portion 145 along the radial direction of the bobbin 140.
- a plurality of radius protrusions 142 may be provided.
- the plurality of radius protrusions 142 may protrude in directions facing each other.
- the present invention is not limited to this, and the plurality of radius protrusions 142 may protrude so as not to face each other.
- the radius protrusion 142 may include a protruding surface 142a and a connecting surface 142b.
- the protruding surface 142a may protrude from the inner surface 141 of the bobbin 140.
- the protruding surface 142a may have a step difference from the inner surface 141 of the bobbin 140.
- the connection surface 142b may connect the protruding surface 142a and the inner surface 141 of the bobbin 140.
- the connection surface 142b may be provided on both sides of the protruding surface 142a.
- the coil 150 may surround the outer circumference of the bobbin 140.
- coil 150 may surround extension portion 147.
- the coil 150 may be disposed between a plurality of support plates 146. When a current is applied to the coil 150, a magnetic field is formed, so the viscosity and friction force of the friction member 160 containing magnetorheological fluid may change.
- the friction member 160 is disposed between the cylinder 100a and the piston 120 and is generated as the drum 11 rotates during operation of the washing machine 1 due to friction between the cylinder 100a and the piston 120. Vibration can be reduced.
- the friction member 160 may be disposed between the outer surface 121 of the piston 120 and the inner surface of the cylinder 100a.
- the friction member 160 may include magneto-rheological fluid.
- a current flows through the coil 150 wound around the bobbin 140, a magnetic field may be generated, and the viscosity of the magnetorheological fluid may change due to the magnetic field.
- the viscosity of the magnetorheological fluid can be increased by applying a current to the coil 150, and thus the friction force applied to the friction member 160 can increase.
- the viscosity of the magnetorheological fluid may be low because no current is applied to the coil 150, and thus the frictional force applied to the friction member 160 may be reduced.
- the viscosity of the magnetorheological fluid may change in the area where a magnetic field is formed by the coil 150, but the viscosity of the magnetorheological fluid does not change in the area where the magnetic field is not formed, so it may not affect the change in friction force. Accordingly, a large number of friction members 160 containing magnetorheological fluid can be placed in areas where a magnetic field is formed, and a small number of friction members 160 can be placed in areas where a magnetic field is not formed.
- the friction member 160 may be disposed between the protruding surface 142a and the outer surface 121 of the piston 120 and/or between the inner surface 141 of the bobbin 140 and the outer surface 121 of the piston 120. .
- a part of the friction member 160 is disposed between the protruding surface 142a and the outer surface 121 of the piston 120, and the other part of the friction member 160 is disposed on the inner surface 141 of the bobbin 140. It may be disposed between the outer surface 121 of the piston 120.
- the magnetic field may mainly occur between the yoke 130 and the piston 120.
- a small number of friction members 160 containing magnetorheological fluid may be disposed between the bobbin 140 and the piston 120, which is an area where a magnetic field is not formed or where a small magnetic field is formed.
- a portion of the friction member 160 disposed between the protruding surface 142a and the outer surface 121 of the piston 120 is the inner surface 141 of the bobbin 140 and the outer surface 121 of the piston 120. It may be less than other parts of the friction member 160 disposed between them.
- the length and/or thickness between the protruding surface 142a and the outer surface 121 of the piston 120 and the distance between the inner surface 141 of the bobbin 140 and the outer surface 121 of the piston 120 may be 1:2.4. However, the above ratio is not limited to this.
- the amount of friction member 160 containing magnetorheological fluid can be reduced while maintaining the same damping force. Since magnetorheological fluid is expensive, the production cost and/or manufacturing cost of the damper 100 can be reduced, which in turn can reduce the production cost and/or manufacturing cost of the washing machine 1.
- the damper 100 may further include a sealing member 170.
- the sealing member 170 may be accommodated within the case.
- the sealing member 170 may seal the space between the piston 120 and the cylinder 100a.
- the sealing member 170 may be disposed between the piston 120 and the third case 113 and/or between the piston 120 and the fifth case 115.
- a plurality of sealing members 170 may be provided.
- Figure 8 is a cross-sectional view of a damper in a washing machine according to an embodiment of the present disclosure.
- the damper 100 may include a piston 120, a cylinder 100a, and a friction member 160.
- the piston 120 may include a radius protrusion 122.
- the cylinder 100a may include a bobbin 140.
- the radius protrusion 122 may protrude from the piston 120 toward the bobbin 140.
- the radial protrusion 122 may protrude from the outer surface 121 of the piston 120 toward the inner surface 141 of the bobbin 140 along the radial direction of the piston 120.
- a plurality of radius protrusions 122 may be provided.
- the plurality of radius protrusions 122 may protrude in opposite directions. However, it is not limited to this.
- the radius protrusion 122 may include a protruding surface 122a and a connecting surface 122b.
- the protruding surface 122a may protrude from the outer surface 121 of the piston 120.
- the protruding surface 122a may have a step difference from the outer surface 121 of the piston 120.
- the connection surface 122b may connect the protruding surface 122a and the outer surface 121 of the piston 120.
- the connection surface 122b may be provided on both sides of the protruding surface 122a.
- the friction member 160 is disposed between the cylinder 100a and the piston 120 and is generated as the drum 11 rotates during operation of the washing machine 1 due to friction between the cylinder 100a and the piston 120. Vibration can be reduced.
- the friction member 160 may be disposed between the outer surface 121 of the piston 120 and the inner surface of the cylinder 100a.
- the friction member 160 may be disposed between the protruding surface 122a and the inner surface 141 of the bobbin 140 and/or between the outer surface 121 of the piston 120 and the inner surface 141 of the bobbin 140. .
- part of the friction member 160 is disposed between the protruding surface 122a and the inner surface 141 of the bobbin 140, and another part of the friction member 160 is disposed between the inner surface 141 of the bobbin 140. It may be disposed between the outer surface 121 of the piston 120.
- a small number of friction members 160 containing magnetorheological fluid may be disposed between the bobbin 140 and the piston 120, which is an area where a magnetic field is not formed or where a small magnetic field is formed.
- a portion of the friction member 160 disposed between the protruding surface 122a and the inner surface 141 of the bobbin 140 is connected to the outer surface 121 of the piston 120 and the inner surface 141 of the bobbin 140. It may be less than other parts of the friction member 160 disposed between them.
- the length and/or thickness between the protruding surface 122a and the inner surface 141 of the bobbin 140 is the distance between the inner surface 141 of the bobbin 140 and the outer surface 121 of the piston 120. It may be less than the length and/or thickness.
- the amount of friction member 160 containing magnetorheological fluid can be reduced while maintaining the same damping force. Since magnetorheological fluid is expensive, the production cost and/or manufacturing cost of the damper 100 can be reduced, which in turn can reduce the production cost and/or manufacturing cost of the washing machine 1.
- Figure 9 is a cross-sectional view of a damper in a washing machine according to an embodiment of the present disclosure.
- the damper 100 may include a bobbin 140.
- the bobbin 140 may include a plurality of radial protrusions 142. In FIG. 7, there are four radius protrusions 142, but the number is not limited thereto. Since the number of radius protrusions 142 increases, the amount of friction member 160 disposed between the piston 120 and the bobbin 140 can be reduced while maintaining the same damping force.
- Figure 10 is a block diagram showing the configuration of a washing machine according to an embodiment of the present disclosure.
- the washing machine 1 is electrically connected to the vibration sensor 180 that detects the vibration value of the tub 12 and the components of the washing machine 1 to control the operation of each component. It may include a control unit 190 for controlling and at least one damper 100 coupled to the cabinet 10 and the tub 12 to reduce vibration of the tub 12.
- the vibration sensor 180 can detect vibration of the tub 12. Specifically, the vibration sensor 180 may detect vibration of the tub 12 generated by rotation of the drum 11 during a washing cycle (eg, spin-drying cycle). Due to the unbalance of the laundry placed inside the drum 11, eccentricity of the drum 11 may occur, and vibration of the tub 12 may occur due to the eccentricity of the drum 11. If the rotational speed of the drum 11 increases while the laundry is unbalanced, the vibration of the tub 12 may also increase, and noise due to the vibration of the tub 12 may also increase.
- a washing cycle eg, spin-drying cycle
- the vibration sensor 180 may output a vibration signal related to the vibration of the tub 12.
- the amplitude of the vibration signal may be defined as the vibration value when the tub 12 vibrates.
- control unit 190 may convert a time domain vibration signal output from the vibration sensor 180 into a frequency domain vibration signal and process the frequency domain vibration signal.
- the vibration sensor 180 may include a 6-axis sensor capable of detecting displacement in 6 axes (X, Y, Z, Pitch, Roll, Yaw).
- control unit 190 determines the vibration value occurring at the front of the tub 12 and the vibration value occurring at the rear of the tub 12 based on the 6-axis displacement (vibration value of the tub) detected by the vibration sensor 180.
- the vibration value can be determined.
- a method of estimating the vibration value occurring at the front of the tub 12 and the vibration value occurring at the rear of the tub 12 based on the displacement of the six-axis sensor may include various methods known to those skilled in the art.
- the vibration sensor 180 may be implemented as a driving unit for rotating the drum 11.
- the drive unit may indirectly sense the vibration of the tub 12 based on the drive current value for driving the motor and/or the driving voltage for driving the motor and/or the speed of the rotor of the motor. .
- the drive unit determines the vibration value of the tub 12 based on the drive current value for driving the motor and/or the drive voltage for driving the motor and/or the speed of the rotor of the motor, and provides information about the determined vibration value. Can be transmitted to the control unit 190.
- the vibration sensor 180 may be implemented as a separate sensor for directly measuring the vibration of the tub 12, and may also be implemented as a drive unit for rotating the drum 11.
- the control unit 190 includes a processor 191 that generates control signals related to the operation of the washing machine 1, and a memory 192 that stores programs, applications, instructions, and/or data for the operation of the washing machine 1. can do.
- the processor 191 and the memory 192 may be implemented as separate semiconductor devices or as a single semiconductor device. Additionally, the control unit 190 may include a plurality of processors or a plurality of memories.
- the control unit 190 may be provided at various locations inside the washing machine 1. For example, the control unit 190 may be included in a printed circuit board provided inside the control panel 14.
- the processor 191 may include an operation circuit, a memory circuit, and a control circuit.
- the processor 191 may include one chip or a plurality of chips. Additionally, the processor 191 may include one core or a plurality of cores.
- the memory 192 may store data including a program for performing a wash cycle according to the wash course and wash settings according to the wash course. Additionally, the memory 192 may store the currently selected wash course and wash settings (eg, spin-dry mode) based on user input.
- the memory 192 includes an algorithm for performing a wash cycle according to the wash course and wash settings, drum speed profile data for controlling the speed of the drum 11 during the spin-drying cycle, and a vibration value of the tub 12. Based on this, a look-up table, etc. for controlling the damping force of the damper 100 can be stored.
- the memory 192 includes volatile memories such as Static Random Access Memory (S-RAM) and Dynamic Random Access Memory (D-RAM), Read Only Memory (ROM), and EP-ROM ( It may include non-volatile memory such as Erasable Programmable Read Only Memory (EPROM).
- S-RAM Static Random Access Memory
- D-RAM Dynamic Random Access Memory
- ROM Read Only Memory
- EP-ROM It may include non-volatile memory such as Erasable Programmable Read Only Memory (EPROM).
- the memory 192 may include one memory element or a plurality of memory elements.
- the processor 191 may process data and/or signals using a program provided from the memory 192, and may transmit control signals to each component of the washing machine 1 based on the processing results. For example, the processor 191 may process user input received through the control panel 14. The processor 191 adjusts the voltage applied to the control panel 14, the motor for rotating the drum 11, the water supply valve, the drain pump, and the coil 150 of the damper 100 in response to user input. A control signal that controls the driving circuit 149 can be output.
- the processor 191 may control the damping force of the damper 100 based on the vibration value in a preset section of the washing cycle using a program provided from the memory 192.
- the processor 191 applies a driving unit for rotating the drum 11, a water supply valve, a drain pump, and a coil 150 of the damper 100 to perform a washing cycle consisting of a washing cycle, a rinsing cycle, and a spin-drying cycle.
- the voltage can be controlled.
- the damper 100 may include a piston 120, a cylinder 100a, a friction member 160, and at least one coil 150 that generates a magnetic field.
- At least one coil 150 may generate a magnetic field when a voltage is applied from the driving circuit 149.
- the viscosity of the friction member 160 may change depending on the magnetic field generated by at least one coil 150, and the damping force of the damper 100 may change accordingly.
- the frictional force of the friction member 160 increases, thereby increasing the damping force of the damper 100.
- the driving circuit 149 includes a power supply unit that supplies a preset voltage (e.g., 12V) and at least one switch that blocks power supplied from the power supply unit or supplies power supplied from the power supply unit to at least one coil 150. can do.
- a preset voltage e.g. 12V
- the driving circuit 149 may supply a preset voltage to at least one coil 150 or block the voltage supplied to at least one coil 150 based on a control signal from the controller 190.
- the control unit 190 may control the duty ratio of the voltage supplied to at least one coil 150 by applying a driving signal to the driving circuit 149.
- control unit 190 can control the driving circuit 149 to adjust the duty ratio of the voltage applied to at least one coil 150.
- the duty ratio of the voltage supplied to at least one coil 150 is the on-off ratio of at least one switch that blocks power supplied from the power supply unit or supplies power supplied from the power supply unit to at least one coil 150. It can mean.
- the duty ratio of the voltage supplied to at least one coil 150 means the ratio of the period in which voltage is supplied to at least one coil 150 and the period in which voltage is not supplied to at least one coil 150. You can. For example, when the duty ratio of the voltage applied to at least one coil 150 is adjusted to 40%, the driving circuit 149 applies the voltage to the at least one coil 150 for a first time and then operates for the first time. The operation of not applying voltage is repeated for 2 hours, and at this time, the ratio of the first time to the second time may be 4:6.
- the damping force of the damper 100 may change.
- the control unit 190 may control the voltage applied to at least one coil 150 based on the rotational speed of the drum 11 and the vibration value of the tub 12. That is, the control unit 190 can control the damping force of the damper 100 based on the rotational speed of the drum 11 and the vibration value of the tub 12.
- a method of controlling the voltage applied to at least one coil 150 includes not only a method of controlling the duty ratio of the voltage applied to at least one coil 150 as described above, but also a method of controlling the voltage applied to at least one coil 150, as will be described later. There may be a multi-stage control method that supplies power in stages from different power sources.
- the damping force of the damper 100 can be controlled more efficiently by controlling the voltage applied to at least one coil 150 using a duty ratio control method or a multi-stage control method.
- a desired magnitude of damping force can be secured by controlling the duty ratio of the voltage applied to at least one coil 150.
- Figure 11 is a flowchart showing an example of a washing machine control method according to an embodiment of the present disclosure.
- Figure 12 shows an example of a drum speed profile of a washing machine according to an embodiment of the present disclosure.
- Figure 13 shows an example of a lookup table for controlling the damping force of the damper based on the vibration value of the tub.
- control unit 190 may start a wash cycle based on receiving a command to start a wash cycle from the user through the control panel 14 (1000).
- the control unit 190 can control each component of the washing machine 1 to perform a washing cycle consisting of a washing cycle, a rinsing cycle, and a spin-drying cycle according to the cycle conditions set by the user.
- the washing cycle may further include a weight sensing stroke for detecting the weight of the laundry and/or an unbalance sensing stroke for detecting the amount of eccentricity of the laundry.
- the control unit 190 can control the drive unit to repeatedly turn on/off the motor (hereinafter referred to as 'drum motor') for rotating the drum 11 to perform the weight sensing stroke, which occurs when the drum motor is turned off.
- the load (weight of laundry) inside the drum 11 can be measured based on the back electromotive force value.
- the control unit 190 may provide a target speed command to the drive unit to rotate the drum 11 at a first target speed, and the time it takes for the drum 11 to reach the first target speed Based on this, the load (weight of laundry) inside the drum 11 can be measured.
- the weight sensing process may be performed before starting the washing process, but the timing of performing the weight sensing process is not limited to this.
- the weight sensing process may be performed to measure the weight of laundry subject to spin-drying after the spin-drying process begins.
- the control unit 190 can control the drive unit so that the drum motor rotates at a constant speed for a certain time to perform an unbalance detection stroke, and can detect the unbalance value based on the value of the drive current detected for a certain time. .
- control unit 190 may determine the unbalance value based on the ratio of the ripple value of the driving current detected for a certain period of time and the average value of the driving current.
- the imbalance detection process may be performed at the start of the dehydration process, but the timing of the imbalance detection process is not limited to this.
- laundry By a washing process, laundry can be washed. Specifically, foreign substances attached to laundry may be separated by the chemical action of detergent and/or mechanical action such as falling.
- the washing process includes supplying water to the tub 12, washing laundry by rotating the drum 11 at low speed, draining the water contained in the tub 12, and rotating the drum 11 at high speed. It may include intermediate spin-drying to separate water from laundry by rotating it.
- control unit 190 can control the drive unit to rotate the drum motor in the forward or reverse direction. As the drum 11 rotates, the laundry falls from the upper side of the drum 11 to the lower side, and the laundry can be washed by falling.
- control unit 190 can control the drive unit to rotate the drum motor at high speed. Due to the high-speed rotation of the drum 11, water may be separated from the laundry contained in the drum 11 and discharged to the outside of the washing machine 1.
- the rotation speed of the drum 11 may be increased stepwise.
- the control unit 190 may control the drive unit to rotate the drum motor at a first rotation speed, and may control the drum motor based on a change in the driving current of the drum motor while the drum motor rotates at the first rotation speed.
- the drum motor may be controlled so that the rotation speed of the motor increases to the second rotation speed.
- the control unit 190 controls the drum motor to increase the rotation speed of the drum motor to the third rotation speed based on the change in the driving current of the drum motor or the rotation speed of the drum motor.
- the drum motor can be controlled to reduce to the first rotation speed.
- laundry By means of a rinse cycle, laundry can be rinsed. Specifically, detergent or foreign substances left in laundry can be washed away with water.
- the rinsing cycle includes water supplying water to the tub 12, rinsing for rinsing laundry by driving the drum 11, drainage for discharging water contained in the tub 12, and driving the drum 11 to remove laundry. It may include intermediate dehydration to separate the water.
- the water supply, drainage, and intermediate dewatering of the rinsing cycle may be the same as the water supply, drainage, and intermediate dehydration of the washing cycle, respectively.
- watering, rinsing, draining, and intermediate dewatering may be performed once or multiple times.
- laundry can be dehydrated. Specifically, water is separated from laundry by high-speed rotation of the drum 11, and the separated water can be discharged to the outside of the washing machine 1.
- the spin-drying process may include a final spin-drying process in which water is separated from the laundry by rotating the drum 11 at high speed. Due to the final dehydration, the final intermediate dehydration of the rinse cycle can be omitted.
- control unit 190 can control the drive unit to rotate the drum motor at high speed. Due to the high-speed rotation of the drum 11, water may be separated from the laundry contained in the drum 11 and discharged to the outside of the washing machine 1. Additionally, the rotation speed of the drum motor can be increased stepwise.
- the performance time of the final spin-drying 1031 may be longer than the intermediate spin-drying time.
- the washing machine 1 can perform a wash cycle to wash laundry.
- the washing machine 1 can increase the rotational speed of the drum motor step by step and increase or decrease the rotational speed of the drum motor based on the change in the driving current of the drum motor. there is.
- the stroke in which relatively large vibration occurs in the tub 12 may be the dewatering stroke in which the drum 11 is rotated from low speed to high speed. Accordingly, the control unit 190 needs to reduce the vibration of the tub 12 by controlling the damping force of the damper 100 during the washing cycle, especially during the dehydration cycle.
- the dehydration process described later may include an intermediate dehydration performed in the washing process, an intermediate dehydration process performed in the rinse process, and a dehydration process performed after the rinse process.
- the spin-drying process includes a weight sensing section (SWS) to detect the weight of the laundry, an unbalance sensing section (SUB) to detect the eccentricity of the laundry, and a resonance in which vibration occurs due to the rotation of the drum 11.
- SWS weight sensing section
- SPS free spin section
- SRB rebalancing section
- SH high-speed rotation section
- the controller 190 may accelerate the drum 11 from a first reference speed (e.g., about 120 RPM) to a third reference speed (e.g., about 500 RPM).
- a first reference speed e.g., about 120 RPM
- a third reference speed e.g., about 500 RPM
- the frequency of vibration occurring as the drum 11 rotates at a low speed matches the resonance frequency of the tub 12, so the tub 12 may vibrate violently.
- the tub 12 may vibrate relatively more severely. there is.
- the tub ( 12) Vibration can be effectively reduced.
- the tub 12 is relatively more severely decelerated in the deceleration section (d2) in which the drum 11 is decelerated from the second reference speed to the first reference speed. It can vibrate.
- vibration of the tub 12 may occur due to rotation of the drum 11 in the weight detection section (SWS) and/or the unbalance detection section (SUB).
- relatively no vibration of the tub 12 may occur in sections other than the sections described above (e.g., free spin section (SPS)).
- SPS free spin section
- the transmission force of the vibration generated by the drum 11 may increase, causing the tub 12 to vibrate more severely.
- the control unit 190 may control the duty ratio of the voltage applied to at least one coil 150 based on the stroke that the washing machine 1 is performing.
- control unit 190 sets the duty ratio of the voltage applied to at least one coil 150 in the weight sensing section (SWS) (example of 1100) to a preset value (a1). It can be adjusted (1150).
- the control unit 190 determines the duty ratio of the voltage applied to at least one coil 150 in advance regardless of the vibration value of the tub 12 detected by the vibration sensor 180. It can be adjusted to the set value (a1).
- the preset value (a1) may be preset to the most efficient value that can reduce vibration occurring in the weight sensing section (SWS).
- the preset value a1 may be set to about 15% to 25%.
- control unit 190 may adjust the duty ratio of the voltage applied to at least one coil 150 in the unbalance detection section (SUB) (example of 1200) to a preset value (a2) (1250) ).
- the control unit 190 sets the duty ratio of the voltage applied to at least one coil 150 in advance regardless of the vibration value of the tub 12 detected by the vibration sensor 180. It can be adjusted to the set value (a2).
- the preset value (a2) may be preset to the most efficient value that can reduce vibration occurring in the unbalance detection section (SUB). More specifically, the preset value (a2) may be smaller than the preset value (a1). For example, the preset value (a2) may be set to about 5% to 15%.
- the vibration of the tub 12 in the weight detection section (SWS) and unbalance detection section (SUB) is relatively unrelated to the amount or type of laundry. Accordingly, by adjusting the duty ratio to a preset value in the weight detection section (SWS) and unbalance detection section (SUB), the vibration of the tub 12 can be efficiently reduced without a complicated algorithm.
- the duty ratio of the voltage applied to at least one coil 150 in the weight detection section (SWS) and the unbalance detection section (SUB) is adjusted to be different from each other, thereby efficiently reducing the vibration of the tub 12. You can.
- control unit 190 determines the duty of the voltage applied to at least one coil 150 based on the vibration value of the tub 12 in the acceleration section SR of the drum 11 (example of 1300). Rain can be controlled (1350).
- vibrations of various sizes may occur depending on the amount or type of laundry, and accordingly, an optimal damping force of the damper 100 that can efficiently reduce vibrations of various sizes is required. do.
- vibration occurs in the acceleration section d1 in which the drum 11 accelerates from the first reference speed to the second reference speed.
- it is required to change the damping force of the damper 100 according to the vibration value of the tub 12.
- the resonance acceleration section SR may be divided into a first section through an nth section (n is a natural number of 3 or more).
- the first section may mean a section in which the drum 11 accelerates from the first reference speed to the 1-2 reference speed
- the second section may mean a section in which the drum 11 accelerates from the 1-2 reference speed. It may refer to a section in which the drum 11 is accelerated from the 1-3 standard speed to the 1-4 reference speed.
- the mth section (m is a natural number of 3 or more smaller than n) may mean a section in which the drum 11 accelerates from the 1st-m reference speed to the second reference speed, and the nth section is the section in which the drum 11 accelerates from the 1st-m reference speed to the 2nd reference speed. It may refer to a section that accelerates from the 2 standard speed to the 3rd standard speed.
- the control unit 190 determines the vibration value of the tub 12. Based on this, the duty ratio of the voltage applied to at least one coil 150 can be controlled, and in the remaining sections excluding the acceleration section d1, at least one coil 150 is applied regardless of the vibration value of the tub 12. The duty ratio of the applied voltage can be controlled.
- control unit 190 adjusts the duty ratio of the voltage applied to at least one coil 150 to the first value when the vibration value of the tub 12 is less than the reference value in the acceleration section d1. , if the vibration value of the tub 12 is greater than the reference value, the duty ratio of the voltage applied to at least one coil 150 may be adjusted to a second value greater than the first value.
- the control unit 190 operates at least one coil ( 150) can be adjusted to b14, and if the vibration value (V) of the tub 12 is smaller than the 1-2 reference value (V12) and greater than the 1-3 reference value (V13), at least one The duty ratio of the voltage applied to the coil 150 can be adjusted to b13, and if the vibration value (V) of the tub 12 is smaller than the 1-1 reference value (V11) and greater than the 1-2 reference value (V12), at least The duty ratio of the voltage applied to one coil 150 can be adjusted to b12, and if the vibration value (V) of the tub 12 is greater than the 1-1 reference value (V11), it is applied to at least one coil 150.
- the duty ratio of the voltage can be adjusted with b11.
- the sizes of the reference values are larger in the order of the 1-1st reference value (V11), the 1-2nd reference value (V12), the 1-3th reference value (V13), and the 1-4th reference value (V14).
- the size of the duty ratio is large in the following order: b11, b12, b13, and b14.
- b11 may be 45% to 55%
- b12 may be 35% to 45%
- b13 may be 25% to 35%
- b14 may be 15% to 25%, but the value of the duty ratio is not limited thereto.
- the control unit 190 operates at least one vibration value (V).
- the duty ratio of the voltage applied to the coil 150 can be adjusted to b24, and if the vibration value (V) of the tub 12 is smaller than the 2-2 reference value (V22) and greater than the 2-3 reference value (V23), at least The duty ratio of the voltage applied to one coil 150 can be adjusted to b23, and the vibration value (V) of the tub 12 is smaller than the 2-1 reference value (V21) and less than the 2-2 reference value (V22).
- the duty ratio of the voltage applied to at least one coil 150 can be adjusted to b22, and if the vibration value (V) of the tub 12 is greater than the 2-1 reference value (V21), at least one coil 150 The duty ratio of the voltage applied to can be adjusted with b21.
- the sizes of the reference values are larger in the order of the 2-1st reference value (V21), the 2-2nd reference value (V22), the 2-3rd reference value (V23), and the 2-4th reference value (V24).
- the size of the duty ratio may be large in the following order: b21, b22, b23, and b24.
- the controller 190 adjusts the duty ratio of the voltage applied to at least one coil 150 based on the vibration value of the tub 12 to the 3-1 value to the 3-i value (i is It can be adjusted by natural number).
- the reference values (V11, V12, V13, and V14) in the first section may be the same as the reference values (V21, V22, V23, and V24) in the second section.
- the damper 100 can be controlled to have optimal damping force by applying the same standard to sections in which the vibration characteristics of the tub 12 are similar among the acceleration sections.
- the reference values (V11, V12, V13, and V14) in the first section may be different from the reference values (V21, V22, V23, and V24) in the second section.
- the damper 100 can be controlled to have optimal damping force by applying different standards to sections in which the vibration characteristics of the tub 12 are different among the acceleration sections.
- the duty ratio values (b11, b12, b13, b14) in the first section may be different from or the same as the duty ratio values (b21, b22, b23, b24) in the second section.
- first lookup table applied in the first section and the second lookup table applied in the second section may be different from each other.
- control unit 190 adjusts the duty ratio of the voltage applied to at least one coil 150 based on the vibration value of the first lookup table and the tub 12 in the first section, and adjusts the duty ratio of the voltage applied to the at least one coil 150 in the first section.
- the duty ratio of the voltage applied to at least one coil 150 may be adjusted based on the second look-up table that is different from the first look-up table and the vibration value of the tub 12 in the section.
- the first look-up table and the second look-up table may include a duty ratio setting value corresponding to the vibration value of the tub 12 in each section of the washing cycle.
- control unit 190 may adjust the duty ratio of the voltage applied to at least one coil 150 in the deceleration section d2 of the drum 11 (example 1400) to a preset value a3. You can.
- the control unit 190 sets the duty ratio of the voltage applied to at least one coil 150 to a preset value regardless of the vibration value of the tub 12 detected by the vibration sensor 180. It can be adjusted with the value (a3).
- the deceleration section d2 may refer to a section in which the drum 11 is decelerated from the second reference speed to the first reference speed.
- the frequency of vibration occurring due to the low-speed rotation of the drum 11 matches the resonance frequency of the tub 12, causing the tub 12 to be severely damaged. It can vibrate.
- the deceleration section (d2) is a section in which the drum 11 is decelerated after spin-drying of the laundry is already completed, the vibration caused by the unbalance of the laundry does not occur in the deceleration section (d2), but rather the vibration of the tub 12 itself. This can be seen to occur.
- the vibration of the tub 12 in the deceleration section d2 is relatively unrelated to the amount or type of laundry. Accordingly, by adjusting the duty ratio to a preset value in the deceleration section d2, the vibration of the tub 12 can be efficiently reduced without a complicated algorithm.
- the preset value (a3) may be preset to the most efficient value that can reduce vibration occurring in the deceleration section (d2).
- the preset value (a3) may be set to about 45% to 55%.
- the control unit 190 controls the remaining sections (No of 1100, No of 1200, No of 1300) that do not correspond to the weight detection section (SWS), unbalance detection section (SUB), acceleration section (d1), and deceleration section (d2) during the washing cycle. No, in 1400 (No), current may not be applied to at least one coil 150 (1500).
- control unit 190 operates on at least one coil 150 in the remaining sections that do not correspond to the weight detection section (SWS), unbalance detection section (SUB), acceleration section (d1), and deceleration section (d2) during the washing cycle.
- the duty ratio of the applied voltage can be set to 0%.
- the damping force of the damper 100 is minimized, thereby increasing the transmission force of vibration generated in the drum 11, thereby preventing the tub 12 from vibrating more severely.
- the control unit 190 may unlock the door lock based on the fact that the washing cycle has ended (1600) and notify the user that the washing cycle has ended through the user interface.
- At least one coil By controlling the duty ratio of the voltage applied to 150), noise caused by vibration of the tub 12 can be effectively prevented.
- the duty ratio of the voltage applied to at least one coil 150 in a section where a specific damping force of the damper 100 is required is adjusted to a preset value regardless of the vibration value of the tub 12, thereby Noise caused by vibration in (12) can be effectively prevented.
- noise caused by vibration of the tub 12 can be efficiently prevented by minimizing the damping force of the damper 100 in the section where the vibration transmission force between the drum 11 and the tub 12 must be reduced. there is.
- Figure 14 is a block diagram showing the configuration of a washing machine according to another embodiment of the present disclosure.
- the damper 100 may include a plurality of coils (eg, a first coil C1, a second coil C2, and a third coil C3).
- each of the plurality of coils C1, C2 C3 may receive voltage from different driving circuits 149-1, 149-2, and 149-3.
- the first coil (C1) can generate a magnetic field when a voltage is applied from the first driving circuit (149-1), and the second coil (C2) can generate a magnetic field when the voltage is applied from the second driving circuit (149-2).
- a magnetic field can be generated.
- the third coil C3 can generate a magnetic field when voltage is applied from the third driving circuit 149-3.
- the first driving circuit 149-1 has a first power supply unit that supplies a preset voltage (e.g., 6V), and blocks power supplied from the first power unit or turns off power supplied from the first power unit to the first coil C1. It may include at least one switch that supplies power to
- the second driving circuit 149-2 includes a second power unit that supplies a preset voltage (e.g., 12V), and blocks power supplied from the second power unit or turns off power supplied from the second power unit to the second coil C2. It may include at least one switch that supplies power to
- the third driving circuit 149-3 has a third power supply unit that supplies a preset voltage (e.g., 24V), and blocks power supplied from the third power unit or turns power supplied from the third power unit to the third coil C3. It may include at least one switch that supplies power to
- the preset first voltage supplied by the first power unit, the preset second voltage supplied by the second power unit, and the preset third voltage supplied by the third power unit may have different sizes, or may have the same size. You can also have
- the control unit 190 may control the first driving circuit 149-1 to supply a first voltage to the first coil C1, and the second driving circuit 149-1 to supply a second voltage to the second coil C2. (149-2) can be controlled, and the third driving circuit (149-3) can be controlled to supply the third voltage to the third coil (C3).
- control unit 190 can independently control the first driving circuit 149-1, the second driving circuit 149-2, and the third driving circuit 149-3.
- control unit 190 may apply the first voltage to only the first coil (C1) among the first coil (C1), the second coil (C2), and the third coil (C3). 1), and the second driving circuit 149-2 so that the second voltage is applied only to the second coil (C2) among the first coil (C1), the second coil (C2), and the third coil (C3). ) can be controlled, and the third driving circuit (149-3) is configured so that the third voltage is applied only to the third coil (C2) among the first coil (C1), the second coil (C2), and the third coil (C3). can be controlled.
- control unit 190 applies the first and second voltages only to the first coil (C1) and the second coil (C2) among the first coil (C1), the second coil (C2), and the third coil (C3).
- the first driving circuit (149-1) and the second driving circuit (149-2) can be controlled to apply the power, and the first among the first coil (C1), the second coil (C2), and the third coil (C3)
- the first driving circuit (149-1) and the third driving circuit (149-3) can be controlled so that the first and third voltages are applied only to the coil (C1) and the third coil (C3), and the first coil (C1) and the third coil (C3) can be controlled.
- a second driving circuit (149-2) so that the second voltage and the third voltage are applied only to the second coil (C2) and the third coil (C3) among (C1), the second coil (C2), and the third coil (C3). ) and the third driving circuit (149-3) can be controlled.
- control unit 190 operates the first driving circuit (149- 1), the second driving circuit 149-2 and the third driving circuit 149-3 can be controlled.
- Figure 15 shows another example of a lookup table for controlling the damping force of the damper based on the vibration value of the tub.
- control unit 190 applies a first voltage and a second voltage to each of the first coil C1, the second coil C2, and the third coil C3 based on the vibration value of the tub 12. And a third voltage may be selectively applied.
- one damper includes three coils, but the number of coils may be two or more than three.
- the controller 190 may operate only the first coil C1 in the acceleration section d1 based on the fact that the vibration value K of the tub 12 is less than the first reference value K1.
- control unit 190 operates the first driving circuit 149-1 to apply the first voltage to the first coil C1 when the vibration value K of the tub 12 is less than the first reference value K1. can be controlled.
- controller 190 may operate only the second coil C2 based on the fact that the vibration value K of the tub 12 is greater than the first reference value K1 and less than the second reference value K2.
- control unit 190 applies the second voltage to the second coil C2 based on the fact that the vibration value K of the tub 12 is greater than the first reference value K1 and less than the second reference value K2.
- the second driving circuit 149-2 can be controlled to do so.
- the magnitude of the first voltage and the second voltage may be different from each other, and the magnitude of the second voltage (e.g., about 12V) may be larger than the magnitude of the first voltage (e.g., about 6V).
- control unit 190 applies the third voltage to the third coil C3 based on the fact that the vibration value K of the tub 12 is greater than the second reference value K2 and less than the third reference value K3.
- the third driving circuit (149-3) can be controlled.
- the magnitude of the second voltage and the third voltage may be different from each other, and the magnitude of the third voltage (e.g., about 24V) may be larger than the magnitude of the second voltage (e.g., about 12V).
- control unit 190 applies current only to the first coil (C1) and the second coil (C2) or only the first coil (C1) and the third coil (C3) depending on the vibration value of the tub 12. can be applied, the current can be applied only to the second coil (C2) and the third coil (C3), or the current can be applied to all of the first coil (C1), the second coil (C2), and the third coil (C3). there is.
- the control unit 190 applies the first voltage to the first coil C1 and controls the vibration of the tub 12. If the vibration value falls within the second reference range (e.g. K2>K>K1), a second voltage is applied to the second coil C2, and the vibration value of the tub 12 falls within the third reference range (e.g. K3> If K>K2), the first voltage and the second voltage can be applied to the first coil C1 and the second coil C2, respectively.
- the vibration value corresponding to the first reference range may be smaller than the vibration value corresponding to the second reference range, and the vibration value corresponding to the second reference range may be smaller than the vibration value corresponding to the third reference range.
- control unit 190 selectively applies voltage to the first coil (C1), the second coil (C2), and/or the third coil (C3) based on the vibration value of the tub 12, thereby damping ( 100) damping force can be adjusted flexibly.
- the damping force of the damper 100 is gradually increased by selectively applying voltages with different or the same magnitude to each coil 150. It can be adjusted.
- Figure 16 is a block diagram showing the configuration of a washing machine according to another embodiment of the present disclosure.
- At least one damper 100 may include a first damper 100-1 and a second damper 100-2 (see FIG. 2).
- the first damper 100-1 may refer to a damper coupled to the tub 12 and the portion close to the front of the cabinet 10 among the bottom surface of the cabinet 10 among the plurality of dampers 100.
- the second damper 100-2 may refer to a damper coupled to the tub 12 and a portion of the bottom surface of the cabinet 10 that is close to the rear of the cabinet 10 among the plurality of dampers 100.
- the first damper 100-1 and the second damper 100-2 may each include coils 150-1a and 150-2a that generate magnetic fields based on applied current.
- the coil 150-1a of the first damper 100-1 may receive voltage from the first driving circuit 149-1a, and the coil 150-2a of the second damper 100-2 may receive voltage from the first driving circuit 149-1a. 2 Voltage can be applied from the driving circuit (149-2a).
- the control unit 190 independently controls the first driving circuit (149-1a) and the second driving circuit (149-2a) to control the damping force of the first damper (100-1) and the damping force of the second damper (100-2). Damping force can be adjusted independently.
- greater vibration may occur at the rear of the tub 12 than at the front
- greater vibration may occur at the front of the tub 12 rather than at the rear.
- FIG. 17 shows another example of a lookup table for controlling the damping force of the damper 100 based on the vibration value of the tub.
- control unit 190 may control the damping force of the first damper 100-1 and the damping force of the second damper 100-2 to be different from each other in some sections of the acceleration section.
- control unit 190 adjusts the duty ratio of the voltage applied to the coil 150-1a of the first damper 100-1 based on the vibration value of the first lookup table and the tub 12, and
- the duty ratio of the voltage applied to the coil 150-2a of the second damper 100-2 may be adjusted based on the vibration value of the tub 12 and the second look-up table, which is different from the first look-up table.
- the control unit 190 controls the coil 150-1a of the first damper 100-1 and the second damper (The voltage applied to the coil 150-2a of the first damper 100-1 can be adjusted, but even if the vibration value of the tub 12 is the same in the same section, the coil 150-1a of the first damper 100-1 and The voltage duty ratio applied to the coil 150-2a of the second damper 100-2 may be different.
- the control unit 190 controls the first damper 100 when the vibration value (V) of the tub 12 is smaller than the 1-3 reference value (V13) and greater than the 1-4 reference value (V14).
- the duty ratio of the voltage applied to the coil 150-1a of -1) can be adjusted to b14, and the vibration value (V) of the tub 12 is smaller than the 1-2 reference value (V12) and the 1-3 reference value. If it is greater than (V13), the duty ratio of the voltage applied to the coil (150-1a) of the first damper (100-1) can be adjusted to b13, and the vibration value (V) of the tub (12) is the 1-1 reference value.
- the duty ratio of the voltage applied to the coil (150-1a) of the first damper (100-1) can be adjusted to b12, and the vibration of the tub (12) If the value (V) is greater than the 1-1 reference value (V11), the duty ratio of the voltage applied to the coil (150-1a) of the first damper (100-1) can be adjusted to b11.
- the control unit 190 controls the second damper 100-
- the duty ratio of the voltage applied to the coil 150-2a of 2) can be adjusted to e14, and the vibration value (V) of the tub 12 is smaller than the 1-2 reference value (V12) and the 1-3 reference value ( If it is greater than V13), the duty ratio of the voltage applied to the coil 150-2a of the second damper 100-2 can be adjusted to e13, and the vibration value V of the tub 12 is set to the 1-1 reference value ( If it is smaller than V11) and larger than the 1-2 reference value (V12), the duty ratio of the voltage applied to the coil 150-2a of the second damper 100-2 can be adjusted to e12, and the vibration value of the tub 12 If (V) is greater than the 1-1 reference value (V11), the duty ratio of the voltage applied to the coil (150-2a) of the second damper (100-2) can be adjusted to e11.
- At this time, at least one of b11 to b14 may be different from a value belonging to the same reference range among e11 to e14.
- the second damper 100-1 may be set to e21, e22, e23, e24, e31, e32, e33, and e34.
- each of b11 to b14 may be smaller than or equal to each of e11 to e14, and may be smaller than each of e11 to e14 than at the rear of the tub 12.
- each of b21 to b24 may be greater than or equal to each of e21 to e24.
- the vibration of the tub 12 can be optimally reduced by adjusting the damping force differently depending on the coupling position of each of the plurality of dampers 100.
- the voltage applied to the coil 150-1a of the first damper 100-1 and the coil 150-2a of the second damper 100-2 The duty ratio can be matched.
- the vibration of the tub 12 can be efficiently reduced without a complicated algorithm.
- the first damper 100-1 is defined as the front damper
- the second damper 100-2 is defined as the rear damper
- Figure 18 shows an example of the amount of vibration occurring at the front of the tub
- Figure 19 shows an example of the amount of vibration occurring at the rear of the tub.
- the vibration mode of the tub 12 in the resonance acceleration section SR of the drum 11 can be broadly defined into three modes (e.g., lateral mode, yawing mode, and pitching mode).
- the lateral mode refers to a mode in which the tub 12 translates left and right
- the yawing mode refers to a mode in which the front of the tub 12 rotates left and right
- the pitching mode refers to a mode in which the front of the tub 12 rotates left and right.
- mode refers to a mode in which the front of the tub 12 rotates up and down.
- the vibration mode of the tub 12 changes depending on the rotation speed of the drum 11.
- the rotation speed of the drum 11 is about 150 RPM, it is mainly a lateral mode, and when the rotation speed of the drum 11 is about 220 RPM.
- the vibration mode of the tub 12 is mainly changed to the yawing mode, and when the rotation speed of the drum 11 is about 250 RPM, the vibration mode of the tub 12 is mainly changed to the pitching mode.
- the vibration mode of the tub 12 may correspond to a lateral mode, and accordingly, the tub ( The magnitude of the vibration value occurring at the rear of the tub 12) may be greater than the vibration value occurring at the front of the tub 12.
- the vibration mode of the tub 12 may correspond to a yawing mode or a pitching mode, , Accordingly, the magnitude of the vibration value occurring at the front of the tub 12 may be greater than the vibration value occurring at the rear of the tub 12.
- the front damper (100-1) in the resonance acceleration section SR If the damping force of ) and the damping force of the rear damper 100-2 are adjusted differently, the vibration value occurring in the tub 12 can be efficiently attenuated.
- Figure 20 shows an example of the duty ratio of the voltage applied to the front damper and the rear damper according to an embodiment.
- the coil included in the front damper 100-1 is assumed to be the first coil
- the coil included in the rear damper 100-2 is assumed to be the second coil.
- the first coil and the second coil may each include at least one coil.
- the control unit 190 determines the damping force of the rear damper 100-2 in the first section in which the drum 11 accelerates from the first speed (e.g., 120 RPM) to the second speed (e.g., 200 RPM).
- the voltage applied to the first coil and the second coil can be controlled to be greater than the damping force of the front damper 100-1.
- control unit 190 may set the duty ratio of the voltage applied to the second coil in the first section in which the drum 11 is accelerated from the first speed (e.g., 120 RPM) to the second speed (e.g., 200 RPM) to the first speed. It can be adjusted to be higher than the duty ratio of the voltage applied to the coil.
- control unit 190 may set the total voltage applied to the plurality of second coils in the first section in which the drum 11 is accelerated from the first speed (e.g., 120 RPM) to the second speed (e.g., 200 RPM). can be adjusted to be higher than the total voltage applied to the plurality of first coils.
- the first section may include a point in time when the rotation speed of the drum 11 is 160 RPM. That is, in the first section, the rotation speed of the drum 11 can reach 160 RPM.
- the rear damper 100-2 disposed close to the rear of the tub 12 Vibration of the tub 12 can be minimized by greatly controlling the friction force.
- control unit 190 determines that the damping force of the front damper 100-1 is adjusted to the rear damper 100 in the second section in which the drum 11 accelerates from the second speed (e.g., 200 RPM) to the third speed (e.g., 260 RPM).
- the voltage applied to the first coil and the second coil can be controlled to be greater than the damping force of -2).
- control unit 190 adjusts the duty ratio of the voltage applied to the first coil in the second section in which the drum 11 is accelerated from the second speed (e.g., 200 RPM) to the third speed (e.g., 260 RPM) to the second speed. It can be adjusted to be higher than the duty ratio of the voltage applied to the coil.
- control unit 190 may set the total voltage applied to the plurality of first coils in the second section in which the drum 11 is accelerated from the second speed (e.g., 200 RPM) to the third speed (e.g., 260 RPM). can be adjusted to be higher than the total voltage applied to the plurality of second coils.
- the second section may include a point in time when the rotation speed of the drum 11 is 230 RPM. That is, in the second section, the rotation speed of the drum 11 can reach 230 RPM.
- first section and the second section are not limited to the above-described examples, and are sections in which the magnitude of vibration occurring at the rear of the tub 12 is greater than the magnitude of vibration occurring at the front of the tub 12. All may be included in the first section, and all sections in which the magnitude of vibration occurring in the front of the tub 12 is greater than the magnitude of vibration occurring in the rear of the tub 12 may be included in the second section.
- the front damper 100-1 disposed close to the front of the tub 12 Vibration of the tub 12 can be minimized by greatly controlling the friction force.
- the damping force of the front damper 100-1 and the rear damper 100-2 can be controlled differently depending on the vibration mode of the tub 12 according to the rotation speed of the drum 11.
- the control unit 190 detects vibration generated at the front of the tub 12 based on the vibration value of the tub 12 obtained from the vibration sensor 180.
- the vibration value occurring at the rear of the tub 12 (hereinafter referred to as 'first vibration value') and the vibration value occurring at the rear of the tub 12 (hereinafter referred to as 'second vibration value') can be determined.
- control unit 190 may independently control the damping force of the front damper 100-1 and the damping force of the rear damper 100-2 based on the first vibration value and the second vibration value.
- control unit 190 controls the voltage applied to the first coil included in the front damper 100-1 based on the first vibration value, and controls the voltage applied to the rear damper 100-2 based on the second vibration value.
- the voltage applied to the second coil included in can be controlled.
- control unit 190 may control the duty ratio of the voltage applied to the first coil according to the look-up table shown in FIG. 13 based on the rotation speed and first vibration value of the drum 11. .
- control unit 190 may control the duty ratio of the voltage applied to the second coil according to the look-up table shown in FIG. 13 based on the rotation speed and second vibration value of the drum 11.
- control unit 190 may selectively supply power to a plurality of first coils according to the look-up table shown in FIG. 15 based on the rotation speed and first vibration value of the drum 11.
- control unit 190 may selectively supply power to a plurality of second coils according to the look-up table shown in FIG. 15 based on the rotation speed and second vibration value of the drum 11.
- control unit 190 controls the first coil and the second coil so that when the first vibration value is greater than the second vibration value, the damping force of the front damper 100-1 becomes greater than the damping force of the rear damper 100-2.
- the voltage applied to the coil is controlled, and when the second vibration value is greater than the first vibration value, the damping force of the rear damper (100-2) is greater than the damping force of the front damper (100-1).
- the applied voltage can be controlled.
- the control unit 190 may adjust the duty ratio of the voltage applied to the first coil to be higher than the duty ratio of the voltage applied to the second coil, and If the value is greater than the first vibration value, the duty ratio of the voltage applied to the second coil can be adjusted to be higher than the duty ratio of the voltage applied to the first coil.
- the control unit 190 may adjust the total voltage applied to the plurality of first coils to be greater than the total voltage applied to the plurality of second coils.
- the magnitude of the total voltage applied to the plurality of second coils can be adjusted to be greater than the magnitude of the total voltage applied to the plurality of first coils.
- vibration occurring at the front and rear of the tub 12 can be identified and the vibration of the tub 12 can be efficiently reduced.
- the disclosed embodiments can be applied not only to the dehydration process, but also to the washing process and rinsing process.
- the disclosed embodiments may be implemented in the form of a recording medium that stores instructions executable by a computer. Instructions may be stored in the form of program code, and when executed by a processor, may create program modules to perform operations of the disclosed embodiments.
- the recording medium may be implemented as a computer-readable recording medium.
- Computer-readable recording media include all types of recording media storing instructions that can be decoded by a computer. For example, there may be read only memory (ROM), random access memory (RAM), magnetic tape, magnetic disk, flash memory, optical data storage, etc.
- ROM read only memory
- RAM random access memory
- magnetic tape magnetic tape
- magnetic disk magnetic disk
- flash memory optical data storage
- computer-readable recording media may be provided in the form of non-transitory storage media.
- 'non-transitory storage medium' simply means that it is a tangible device and does not contain signals (e.g. electromagnetic waves). This term refers to cases where data is semi-permanently stored in a storage medium and temporary storage media. It does not distinguish between cases where it is stored as .
- a 'non-transitory storage medium' may include a buffer where data is temporarily stored.
- Computer program products are commodities and can be traded between sellers and buyers.
- the computer program product may be distributed in the form of a machine-readable recording medium (e.g. compact disc read only memory (CD-ROM)) or via an application store (e.g. Play StoreTM) or on two user devices (e.g. It can be distributed (e.g. downloaded or uploaded) directly between smartphones) or online.
- a machine-readable recording medium e.g. compact disc read only memory (CD-ROM)
- an application store e.g. Play StoreTM
- two user devices e.g. It can be distributed (e.g. downloaded or uploaded) directly between smartphones) or online.
- at least a portion of the computer program product e.g., a downloadable app
- a machine-readable recording medium such as the memory of a manufacturer's server, an application store's server, or a relay server. It can be temporarily stored or created temporarily.
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- Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
Abstract
Description
Claims (15)
- 캐비닛;상기 캐비닛 내에 배치되는 터브;상기 터브의 내부에 회전 가능하게 마련되는 드럼;상기 캐비닛과 상기 터브에 결합되는 적어도 하나의 댐퍼에 있어서, 자기장에 따라 점성이 변하는 자기유변유체(Magneto-Rheological Fluid)와, 상기 자기장을 생성하는 적어도 하나의 코일을 포함하는 적어도 하나의 댐퍼; 및상기 자기유변유체의 점성을 변화시켜 상기 드럼의 회전에 따른 상기 터브의 진동을 저감하도록 하는 상기 자기장을 발생시키기 위해, 상기 드럼의 회전 속도 및 상기 터브의 진동값에 기초하여 상기 적어도 하나의 코일에 인가되는 전압을 제어하는 제어부;를 포함하는 세탁기.
- 제1항에 있어서,상기 제어부는,상기 터브의 진동값이 기준값보다 작은 것에 기초하여 상기 적어도 하나의 코일에 인가되는 전압의 듀티비를 제1 값으로 조절하고, 상기 터브의 진동값이 상기 기준값보다 큰 것에 기초하여 상기 적어도 하나의 코일에 인가되는 전압의 듀티비를 상기 제1 값보다 큰 제2 값으로 조절하는 세탁기.
- 제1항에 있어서,상기 제어부는,상기 드럼이 제1 속도에서 제2 속도로 가속되는 세탁기 행정의 제1 구간에서 제1 룩업 테이블에 기초하여 상기 적어도 하나의 코일에 인가되는 전압의 듀티비를 조절하고,상기 드럼이 상기 제2 속도에서 제3 속도로 가속되는 상기 세탁기 행정의 제2 구간에서 상기 제1 룩업 테이블과 상이한 제2 룩업 테이블에 기초하여 상기 적어도 하나의 코일에 인가되는 전압의 듀티비를 조절하는 세탁기.
- 제1항에 있어서,상기 적어도 하나의 코일은,제1 전원으로부터 제1 전압을 공급 받는 제1 코일; 및제2 전원으로부터 제2 전압을 공급 받는 제2 코일;을 포함하고,상기 제어부는,상기 드럼의 회전 속도 및 상기 터브의 진동값에 기초하여 상기 제1 코일 및 상기 제2 코일 각각에 상기 제1 전압 및 상기 제2 전압을 선택적으로 인가하는 세탁기.
- 제4항에 있어서,상기 제어부는,상기 터브의 진동값이 제1 기준 범위에 속하는 것에 기초하여 상기 제1 코일에 상기 제1 전압을 인가하고, 상기 터브의 진동값이 제2 기준 범위에 속하는 것에 기초하여 상기 제2 코일에 상기 제2 전압을 인가하고, 상기 터브의 진동값이 제3 기준 범위에 속하는 것에 기초하여 상기 제1 코일 및 상기 제2 코일에 각각 상기 제1 전압 및 상기 제2 전압을 인가하는 세탁기.
- 제1항에 있어서,상기 적어도 하나의 댐퍼는,제1 코일을 포함하고, 상기 터브의 전면과 후면 중 전면에 가깝게 배치되는 적어도 하나의 전면 댐퍼; 및제2 코일을 포함하고, 상기 터브의 전면과 후면 중 후면에 가깝게 배치되는 적어도 하나의 후면 댐퍼;를 포함하고,상기 제어부는,상기 드럼이 제1 속도에서 제2 속도로 가속되는 세탁기 행정의 제1 구간에서 상기 후면 댐퍼의 감쇠력이 상기 전면 댐퍼의 감쇠력보다 커지도록 상기 제1 코일 및 상기 제2 코일에 인가되는 전압을 제어하고,상기 드럼이 상기 제2 속도에서 제3 속도로 가속되는 상기 세탁기 행정의 제2 구간에서 상기 전면 댐퍼의 감쇠력이 상기 후면 댐퍼의 감쇠력보다 커지도록 상기 제1 코일 및 상기 제2 코일에 인가되는 전압을 제어하는 세탁기.
- 제6항에 있어서,상기 제1 속도와 상기 제2 속도 사이에는 160RPM이 있고, 상기 제2 속도와 상기 제3 속도 사이에는 230RPM이 있는 세탁기.
- 제1항에 있어서,상기 세탁기는, 상기 터브의 진동값을 감지하는 진동센서;를 더 포함하고,상기 적어도 하나의 댐퍼는,제1 코일을 포함하고, 상기 터브의 전면과 후면 중 전면에 가깝게 배치되는 적어도 하나의 전면 댐퍼; 및제2 코일을 포함하고, 상기 터브의 전면과 후면 중 후면에 가깝게 배치되는 적어도 하나의 후면 댐퍼;를 포함하고,상기 제어부는,상기 진동센서로부터 감지된 터브의 진동값에 기초하여 상기 터브의 전면에서 발생하는 제1 진동값과 상기 터브의 후면에서 발생하는 제2 진동값을 결정하고, 상기 제1 진동값에 기초하여 상기 제1 코일에 인가되는 전압을 제어하고, 상기 제2 진동값에 기초하여 상기 제2 코일에 인가되는 전압을 제어하는 세탁기.
- 제8항에 있어서,상기 제어부는,상기 제1 진동값이 상기 제2 진동값보다 큰 것에 기초하여 상기 전면 댐퍼의 감쇠력이 상기 후면 댐퍼의 감쇠력보다 커지도록 상기 제1 코일 및 상기 제2 코일에 인가되는 전압을 제어하고, 상기 제2 진동값이 상기 제1 진동값보다 큰 것에 기초하여 상기 후면 댐퍼의 감쇠력이 상기 전면 댐퍼의 감쇠력보다 커지도록 상기 제1 코일 및 상기 제2 코일에 인가되는 전압을 제어하는 세탁기.
- 제9항에 있어서,상기 제어부는,상기 전면 댐퍼의 감쇠력이 상기 후면 댐퍼의 감쇠력보다 커지도록 상기 제1 코일에 인가되는 전압의 듀티비를 상기 제2 코일에 인가되는 전압의 듀티비보다 높게 조절하고,상기 후면 댐퍼의 감쇠력이 상기 전면 댐퍼의 감쇠력보다 커지도록 상기 제2 코일에 인가되는 전압의 듀티비를 상기 제1 코일에 인가되는 전압의 듀티비보다 높게 조절하는 세탁기.
- 자기장에 따라 점성이 변하는 자기유변유체(Magneto-Rheological Fluid)와, 상기 자기장을 생성하는 적어도 하나의 코일을 포함하고, 캐비닛과 터브에 결합되는 적어도 하나의 댐퍼를 포함하는 세탁기의 제어방법에 있어서,상기 자기유변유체의 점성을 변화시켜 상기 드럼의 회전에 따른 상기 터브의 진동을 저감하도록 하는 상기 자기장을 발생시키기 위해, 상기 드럼의 회전 속도 및 상기 터브의 진동값에 기초하여 상기 적어도 하나의 코일에 인가되는 전압을 제어하는 것;을 포함하는 세탁기의 제어방법.
- 제11항에 있어서,상기 적어도 하나의 코일에 인가되는 전압을 제어하는 것은,상기 터브의 진동값이 기준값보다 작은 것에 기초하여 상기 적어도 하나의 코일에 인가되는 전압의 듀티비를 제1 값으로 조절하고;상기 터브의 진동값이 상기 기준값보다 큰 것에 기초하여 상기 적어도 하나의 코일에 인가되는 전압의 듀티비를 상기 제1 값보다 큰 제2 값으로 조절하는 것;을 포함하는 세탁기의 제어방법.
- 제11항에 있어서,상기 적어도 하나의 코일에 인가되는 전압을 제어하는 것은,상기 드럼이 제1 속도에서 제2 속도로 가속되는 세탁기 행정의 제1 구간에서 제1 룩업 테이블에 기초하여 상기 적어도 하나의 코일에 인가되는 전압의 듀티비를 조절하고;상기 드럼이 상기 제2 속도에서 제3 속도로 가속되는 상기 세탁기 행정의 제2 구간에서 상기 제1 룩업 테이블과 상이한 제2 룩업 테이블에 기초하여 상기 적어도 하나의 코일에 인가되는 전압의 듀티비를 조절하는 것;을 포함하는 세탁기의 제어방법.
- 제11항에 있어서,상기 적어도 하나의 코일은,제1 전원으로부터 제1 전압을 공급 받는 제1 코일; 및제2 전원으로부터 제2 전압을 공급 받는 제2 코일;을 포함하고,상기 적어도 하나의 코일에 인가되는 전압을 제어하는 것은,상기 드럼의 회전 속도 및 상기 터브의 진동값에 기초하여 상기 제1 코일 및 상기 제2 코일 각각에 상기 제1 전압 및 상기 제2 전압을 선택적으로 인가하는 것;을 포함하는 세탁기의 제어방법.
- 제14항에 있어서,상기 제1 코일 및 상기 제2 코일 각각에 상기 제1 전압 및 상기 제2 전압을 선택적으로 인가하는 것은,상기 터브의 진동값이 제1 기준 범위에 속하는 것에 기초하여 상기 제1 코일에 상기 제1 전압을 인가하고;상기 터브의 진동값이 제2 기준 범위에 속하는 것에 기초하여 상기 제2 코일에 상기 제2 전압을 인가하고;상기 터브의 진동값이 제3 기준 범위에 속하는 것에 기초하여 상기 제1 코일 및 상기 제2 코일에 각각 상기 제1 전압 및 상기 제2 전압을 인가하는 것;을 포함하는 세탁기의 제어방법.
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| CN202380025589.8A CN118829754A (zh) | 2022-07-13 | 2023-05-04 | 洗衣机和用于控制该洗衣机的方法 |
| EP23839769.9A EP4464834A4 (en) | 2022-07-13 | 2023-05-04 | WASHING MACHINE AND METHOD FOR CONTROLLING THE SAME |
| US18/210,321 US12565725B2 (en) | 2022-07-13 | 2023-06-15 | Washing machine and controlling method for the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20100050382A (ko) * | 2009-08-18 | 2010-05-13 | 주식회사 썬 프레인 코 | 자기식 댐퍼 및 이를 구비한 세탁기 |
| KR20130014058A (ko) * | 2010-05-06 | 2013-02-06 | 가부시끼가이샤 도시바 | 세탁기 |
| CN106757991A (zh) * | 2015-11-25 | 2017-05-31 | 青岛海尔智能技术研发有限公司 | 波轮洗衣机及其振动控制方法 |
| JP2020089404A (ja) * | 2018-12-03 | 2020-06-11 | 日立グローバルライフソリューションズ株式会社 | ドラム式洗濯機 |
| CN112921587A (zh) * | 2021-01-08 | 2021-06-08 | 珠海格力电器股份有限公司 | 洗衣机的减震控制方法、系统和洗衣机 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100050382A (ko) * | 2009-08-18 | 2010-05-13 | 주식회사 썬 프레인 코 | 자기식 댐퍼 및 이를 구비한 세탁기 |
| KR20130014058A (ko) * | 2010-05-06 | 2013-02-06 | 가부시끼가이샤 도시바 | 세탁기 |
| CN106757991A (zh) * | 2015-11-25 | 2017-05-31 | 青岛海尔智能技术研发有限公司 | 波轮洗衣机及其振动控制方法 |
| JP2020089404A (ja) * | 2018-12-03 | 2020-06-11 | 日立グローバルライフソリューションズ株式会社 | ドラム式洗濯機 |
| CN112921587A (zh) * | 2021-01-08 | 2021-06-08 | 珠海格力电器股份有限公司 | 洗衣机的减震控制方法、系统和洗衣机 |
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