JPH1119381A - Control method of fully automatic washing machine - Google Patents

Abstract

(57) [Summary] Conventionally, since a motor is started and operated by a single condenser, the starting torque is always constant, and when washing thin clothes at a low water level, the rotational force of the stirring blade causes the resistance of the clothes to decrease. When washing heavy clothes at a high water level, the rotating force of the stirring blade is too weak against the resistance of the clothes.
Since the rotation speeds of z and 60 Hz were adjusted, it was difficult to share 50 Hz and 60 Hz. A plurality of capacitor parallel circuits are provided in a motor circuit, and the connection of each capacitor is switched so that the water flow and the state of the clothes determined by the laundry amount / cloth detection control during washing are more reliable. By controlling the number of rotations in the same manner at the time of dehydration, the power supply frequency 50H
Control of a fully automatic washing machine that shares z and 60 Hz.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor circuit of a washing machine, and more particularly to a control method of a fully automatic washing machine for controlling a motor starting torque and a motor rotation speed by switching connection of a plurality of capacitors.

[0002]

2. Description of the Related Art In a conventional washing machine, a motor is started and operated by a single condenser. As shown in FIG. 4, a motor circuit connects triacs 8b and 8c to a motor 8 and a control unit as shown in FIG. Triac 8 by command
Signals are sent to the gates b and 8c to turn them on and off.

[0003]

In the conventional washing machine, the motor is started and operated by one condenser, and the motor torque is always constant. This is because, for example, when washing thin clothing (such as lingerie) at a low water level, the rotational force of the stirring blade is too strong against the resistance of the clothing, the friction between the clothing and the stirring blade increases, and the damage to the clothing increases. Cases arise.
Conversely, heavy clothes (bath towels, jeans, etc.) at high water levels
When washing clothes, the rotating force of the stirring blade is too weak against the resistance of the clothes, and the washing effect may be impaired.

At the time of dehydration, the power supply frequency is 50 Hz.
When the motor starting characteristics at 60 Hz are compared with those at 60 Hz, the rotational speed is 6
0 Hz is higher. Conventionally, the spinning speed at 50 Hz and 60 Hz has been adjusted by using components dedicated to each frequency in the motor drive system. Therefore, it was difficult to share 50 Hz and 60 Hz.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a washing machine which controls the flow of water more reliably for the condition of clothes during washing, controls the spinning speed during spinning, and shares 50 Hz and 60 Hz. I do.

[0006]

The gist of the present invention to achieve the above object is to provide a motor circuit having a plurality of capacitor parallel circuits, and to detect the water level and the clothing determined by the control unit after detecting the amount of cloth and the quality of the cloth. For example, when switching the connection of each capacitor for the state of, for example, when washing thin clothing at a low water level, control the water flow that is gentle to the clothing by reducing the capacitor capacity, and conversely, when washing heavy clothing at a high water level Controls the strong water flow that increases the capacity of the condenser and strongly wash the clothes.

At the time of dehydration, the power supply frequency is 60 Hz.
In the case of dehydration, the condenser capacity is increased at the start of dehydration, that is, the motor is started with a high starting torque, and after reaching the set number of revolutions, the condenser capacity is reduced by switching the connection of the condenser to suppress the increase in the number of revolutions to thereby increase the dehydration rotation. Stabilize numbers. According to this control method, the components of the motor drive system can be unified, and 50 Hz and 60 Hz can be shared.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a basic structure of a fully automatic washing machine, wherein 1 is a frame body containing an internal mechanism, 2 is a washing and dewatering tub, and a fluid balancer 3 is provided on an upper part thereof, and a fluid balancer 3 is provided on a central bottom part. The stirring blade 4 is provided rotatably.

An outer tub 5 made of synthetic resin is provided outside the washing and dewatering tub 2, and a drive unit is fixed to the bottom of the outer tub 5 via a steel plate-made center base 6, and is protected from four corners at the upper end of the frame 1. It is suspended by the vibration device 7.

The driving device is roughly composed of a motor 8, a motor driving capacitor 8a, a clutch 9, and a V-belt. The rotation of the motor 8 is transmitted to the clutch 9 via a motor pulley 11, a V-belt 10, and a P-pulley 12. introduce.
The clutch 9 transmits the rotational force to the stirring blade 4 via the internal reduction gear during washing, and transmits the rotational force to the washing and dewatering layer 2 without the reduction gear during dehydration, thereby performing dehydration.

Reference numeral 13 denotes a water supply electromagnetic valve, one end of which is connected to a faucet, and one end of which is connected to an inlet 14.

Reference numeral 15 denotes an upper surface cover having a panel box portion, in which a control unit 16 for controlling energization of each electric component, a water level sensor 17 for detecting a water level, a power switch 18, an input switch portion 19, The display substrate 20 and the like are stored.

The panel box section 21 is provided at two front and rear places, and has a front panel 22 and a back panel 23 mounted thereon, respectively. The top cover 15 has an opening 24 for putting in clothes, and a lid 25 for opening and closing the opening 24.
Is provided on the upper portion of the frame via a front panel 22 and a back panel 23 so as to cover the upper opening of the frame 1,
It is fixed to the frame 1 with mounting screws from above.

Reference numeral 27 denotes a drainage device, which comprises a drainage valve 28, an internal drainage hose 29, and an external drainage hose 30. One end of the drain valve 28 is attached to a drain port 5 a provided at the bottom of the outer tub 5, and the other end is connected to an internal drain hose 29.

The water level is detected by a water level sensor 17 via an air tube 31 from an air trap 5b provided in the outer tank 5.

A base 34 made of a synthetic resin having legs is mounted on the lower surface of the frame 1. One leg is formed at each of the four corners of the base 34, and the right side facing the front of the washing machine is a height-adjustable leg 35, and the other three are fixed legs 33 having a constant height. Have been.

FIG. 2 shows a cloth amount / water quality sensor circuit for detecting the cloth amount / cloth quality. Here, the cloth amount detection control will be described. First, put appropriate clothes into the washing and dewatering tub 2,
The motor 8 is operated by pressing the power switch button 18 and then pressing the washing start button. The operation of the motor 8 is performed by alternately sending a signal to the gate of the triac according to a command from the control unit 16 so that the motor 8 rotates forward and backward.

From the forward / reverse rotation of the motor 8, the clothes are moved by rotating the stirring blade 4 forward / reverse by the rotation transmission system shown in FIG. At this time, the counter electromotive force of the motor generated by the inertial rotation of the stirring blade 4 immediately after the motor 8 is turned off is supplied to the motor driving capacitor 8.
As shown in FIG. 3, the signal is detected by the voltage between the terminals a, and the attenuation waveform of the voltage between the terminals is converted into a DC rectangular wave pulse, and the signal is sent to the control unit 16. By this control, the resistance applied to the stirring blade 4 changes depending on the size of the clothes, and the degree of this change is detected to determine the amount of the cloth.

After the cloth amount is determined by the above control, the cloth quality detection control is started. The water supply solenoid valve 13 is energized by a signal from the control unit 16, and water is supplied into the washing and dewatering tub 2. When the water level sensor 17 detects that the water has been supplied to the specified water level, the motor 8 rotates forward and backward in the same manner as in the cloth amount detection control, and the generated counter electromotive force of the motor is used as the driving capacitor 8.
The signal is converted into a signal (T1) of the terminal voltage a and sent to the control unit 16, and the water supply is started again.

When the water level sensor 17 detects that water has been supplied to the water level determined by the cloth amount detection control, the motor 8 rotates forward and backward in the same manner as described above, and the generated counter electromotive force of the motor is applied between the terminals of the driving capacitor 8a. Voltage signal (T2)
And sends it to the control unit 16. These T
The cloth quality is determined from the changes in the signals 1 and T2, and the process proceeds to the next washing step.

FIG. 5 is a diagram showing one embodiment of a circuit for driving a motor of a washing machine according to the present invention. The difference from FIG.
A parallel circuit of a number of capacitors is provided in the motor circuit, and the connection of each capacitor is switched so that the electric capacity of the capacitor is 20 μF (capacitor 8a) and 40 μF (
d) and 60 μF (capacitor 8a + capacitor 8d).

The operation of the above configuration will be described. First, in the washing process, when the water level / cloth determined by the above-described cloth amount / cloth detection control is, for example, a thin clothing (such as lingerie) at a low water level, as shown in FIG. The friction between the clothes and the agitating blades 4 is too large, so that the clothes are easily damaged and the life of the clothes is shortened.

In such a case, a signal is sent to the triac 8f shown in FIG.
The motor is started and operated only with a (20 μF). That is, as shown in FIG. 7, the motor torque is reduced, and the rotational force of the stirring blade 4 is weakened against the resistance of the clothes, so that the thin clothes are gently washed with a water flow that reduces damage to the thin clothes, that is, a soft water flow. be able to.

Conversely, when washing heavy clothes (bath towels, jeans, etc.) at a high water level, the rotating force of the stirring blade 4 becomes weak against the resistance of the clothes, and the washing effect is impaired. In this case, the conventional washing machine responds by increasing the ON time of the reversal cycle of the stirring blade 4, but the washing time is longer.

Therefore, both the capacitor 8a and the capacitor 8d (60 μF) are used, and the motor is started and operated with a high motor torque. As a result, the rotating force of the stirring blade 4 becomes stronger against the resistance of the clothes, and a water flow for washing thick clothes with a strong force, that is, a strong water flow is generated, thereby maintaining the washing effect without prolonging the washing time. Can be.

In the dehydration step, the power supply frequency 50H
Comparing the motor starting characteristics at z and 60 Hz, the rotation speed is higher at 60 Hz as shown in FIG. Conventionally 60Hz
In order to suppress the increase in the spinning speed of the dehydration and obtain a spinning speed equivalent to 50 Hz, a motor pulley 11a dedicated to 60 Hz is newly provided in the motor drive system shown in FIG. 1 to adjust the spinning speed. Therefore, the specifications of the drive system of 50 Hz and 60 Hz are different, and it is difficult to share 50 Hz and 60 Hz.

Therefore, at the start of dehydration at 60 Hz, both the capacitors 8a and 8d (60 μF) shown in FIG. 5 are used, the motor is started at a high motor torque, and after reaching the set number of revolutions, the connection of the capacitor 8a is switched. (20 μF) only. That is, as shown in FIG. 9, by reducing the condenser capacity and suppressing the increase in the spin-drying speed, the spinning speed at 60 Hz can be stabilized. With this control method, the specifications of the motor drive system are unified, and 50 Hz and 60 Hz can be shared.

[0029]

According to the present invention, by providing a plurality of capacitor parallel circuits for starting and operating the motor, a more reliable water flow can be controlled with respect to the state of the clothes during washing, and the spinning rotation can be performed during spinning. By controlling the number, it is possible to provide a washing machine capable of sharing the power supply frequencies of 50 Hz and 60 Hz.

[Brief description of the drawings]

FIG. 1 is a sectional view of a basic structure showing one embodiment of the present invention.

FIG. 2 is a circuit diagram for detecting the amount of cloth and the quality of clothing according to an embodiment of the present invention.

FIG. 3 is an output diagram of cloth amount / cloth detection according to an embodiment of the present invention.

FIG. 4 is an electric circuit diagram of a capacitor start operation motor showing a conventional example.

FIG. 5 is a circuit diagram of a capacitor start operation motor showing one embodiment of the present invention.

FIG. 6 is a diagram showing a relationship between a capacitor capacity and a motor torque according to an embodiment of the present invention.

FIG. 7 is a diagram showing the relationship between the capacitance of a capacitor and damage to clothing according to an embodiment of the present invention.

FIG. 8 is a diagram showing a relation between a power supply frequency and a spinning speed in a conventional example.

FIG. 9 is a diagram showing the relationship between the capacity of a condenser and the number of rotations for dehydration according to an embodiment of the present invention.

[Explanation of symbols]

2 ... Washing and dewatering tank, 4 ... Stirring blade, 8 ... Motor, 8a, 8
d: motor starting and operating capacitors, 8b, 8c, 8
e, 8f: triac, 9: clutch, 16: control unit.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Yoshio Niwase 1-1-1, Higashitaga-cho, Hitachi City, Ibaraki Prefecture Inside the Taga Headquarters, Electrical Equipment Division, Hitachi, Ltd. 1-1-1, Machi, Hitachi, Ltd.Electrical Equipment Division, Taga Headquarters

Claims (6)

[Claims] 1. A motor for driving a washing and dewatering tub and a stirring blade, control means for controlling energization of the motor, and a water level / cloth / cloth detecting device, wherein a plurality of capacitor parallel circuits are connected to the motor circuit. A method of controlling a fully automatic washing machine, comprising: changing a capacitor capacity by switching connection of each capacitor. 2. A method for controlling a fully automatic washing machine according to claim 1, wherein the strength of the water flow during washing is controlled by changing the motor starting torque by changing the capacitor capacity by switching connection of each capacitor. . 3. The method according to claim 2, wherein when washing thin clothes (such as lingerie), the motor starting torque is reduced by reducing the capacity of the capacitors by switching the connection of each capacitor, thereby providing a water flow (soft water flow) that is gentle on the clothes. A method for controlling a fully automatic washing machine, characterized by controlling. 4. In the case of washing heavy clothes (bath towels, jeans, etc.) according to claim 2, the motor starting torque is increased by increasing the capacity of the capacitors by switching the connection of each capacitor, and the water flow for washing the clothes. A method for controlling a fully automatic washing machine, characterized by controlling (strong water flow). 5. The motor torque according to claim 1, wherein the motor is started with a strong torque using a plurality of capacitors at the start of dehydration, and after reaching a set number of revolutions, the capacitor capacity is reduced by switching connection of the capacitors to reduce the motor torque. A method for controlling a fully automatic washing machine characterized by suppressing an increase in the spinning speed and stabilizing the spinning speed. 6. The power supply frequency of 50 Hz and 60 Hz can be shared by suppressing an increase in the spinning speed after reaching the set speed and stabilizing the spinning speed. And a fully automatic washing machine control method.