JPH1141966A - Motor control device, washing machine to which motor control device is applied, and motor control method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To suppress the generation of an impact sound due to sudden application of a driving force to a rotating body. When a rotation speed of a motor reaches a target rotation speed, a zero-cross counter and a motor up / down flag are reset. Thereafter, until the value of the zero-cross counter 41 reaches 6, the triac 22
Are gradually increased. Then, after the value of the zero-cross counter 41 becomes 6, the conduction angle of the triac 22 is fixed, and a constant amount of power is continuously supplied to the motor 14. When a predetermined time has elapsed since the motor up / down flag 33 was reset, the zero-cross counter 41 is reset, and thereafter the conduction angle of the triac 22 is gradually reduced until the value of the zero-cross counter 41 becomes 10. Then, when the value of the zero-cross counter 41 becomes 11, the conduction angle of the triac 22 is set to 0 °.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor control device and a motor control method particularly suitable for controlling the driving of a motor provided in a washing machine. The present invention also relates to a washing machine provided with the motor control device.

[0002]

2. Description of the Related Art A washing machine is provided with a motor for rotating a pulsator and a dewatering tub, and in order to rotate this motor at a predetermined rotation speed, it is common practice to control the driving of the motor. ing. The following cases can be exemplified as a case where drive control is performed so that the motor rotates at a predetermined rotation speed. Some washing machines perform so-called low-speed dehydration, in particular, when dehydrating clothes that easily cause cloth pain, performing dehydration at a lower rotation speed of the dehydration tub than during normal dehydration. When performing the low-speed dehydration, drive control is performed so that the motor rotates at a predetermined low rotation speed.

A single-phase induction motor is widely used as a motor provided in a washing machine, and the maximum rotation speed of the single-phase induction motor varies depending on the frequency of a connected AC power supply. For example, at the time of dehydration, when connected to an AC power supply of 50 Hz, the dehydration tank is operated at a maximum of 1000 rpm.
The motor that rotates at m drives the dewatering tub at up to 1200 rpm when connected to a 60 Hz AC power supply. Therefore, for example, when a washing machine designed on the basis of being connected to an AC power supply of 50 Hz is used by being connected to the AC power supply of 60 Hz, the motor rotates at an appropriate rotation speed or more, and the pulsator and the dehydration tub are rotated. Rotation becomes faster,
There is a possibility that the cloth may be damaged by the laundry or the pulsator or the dehydration tub may be deteriorated.

Therefore, when the motor is connected to a 60 Hz AC power supply, the motor is rotated at the same speed as when the motor is connected to a 50 Hz AC power supply in order to prevent the above-mentioned problems from occurring. Is controlled. One of the prior arts for rotating the motor at a target rotation speed is to turn off the motor when the motor rotation speed reaches a first rotation speed higher than the target rotation speed, and to set a second rotation speed lower than the target rotation speed. A method of turning on the motor at the time when the number of rotations has been reduced to the number of rotations is given. In this method, the rotation speed of the motor fluctuates between the first rotation speed and the second rotation speed, and as a result, is maintained near the target rotation speed.

[0005]

However, in the above-mentioned prior art, when spinning the motor from the off state during dehydration, an impulsive sound "con" is generated, which is inconvenient for the user of the washing machine. There was pleasure. There are various possible reasons for the generation of the impact sound. One of the reasons is that the driving force of the motor suddenly acts on the dewatering tub at the moment when the motor is turned on.

In order to prevent the occurrence of such a striking sound, it is conceivable to control the phase of the motor so as to gradually increase the number of revolutions of the motor. However,
Even if the rotation speed of the motor is gradually increased, the above-described impact sound does not completely disappear, and if the rotation speed of the motor is controlled by phase control, a new electromagnetic sound of the motor may be generated, It gives more and more discomfort to the user.

Therefore, an object of the present invention is to generate a striking sound due to a sudden application of a driving force to a rotating body,
An object of the present invention is to provide a motor control device and a motor control method that can rotate a motor at a target rotation speed without giving a user discomfort. Another object of the present invention is to provide the user with no discomfort due to noise.
An object of the present invention is to provide a washing machine capable of rotating a motor at a target rotation speed.

[0008]

According to a first aspect of the present invention, there is provided an apparatus for controlling a motor for generating a driving force for rotating a rotating body, comprising: A triac element provided in a power supply path to the motor and controlled to be on / off to adjust the power supplied to the motor; a rotation number detection means for detecting the rotation number of the motor; and a rotation number detection means And a gate signal for turning on the triac element at a timing corresponding to the conduction angle set by the conduction angle setting means. And a gate signal output means for giving to the triac element, the conduction angle setting means, for a predetermined period from when the motor rotation speed reaches a preset rotation speed, Rotation speed reduction means for setting the conduction angle of the triac element to gradually increase to a predetermined angle, and after the predetermined period elapses, until the motor rotation speed reaches the predetermined rotation speed, And a rotation speed increasing means for setting the conduction angle to be gradually reduced.

According to the configuration of the first aspect, the conduction angle of the triac is gradually increased to a predetermined angle until a predetermined time period elapses after the motor rotation speed reaches a preset rotation speed. After the conduction angle of the triac is increased to the predetermined angle, the conduction angle of the triac is set to the predetermined angle, and a constant amount of power is continuously supplied to the motor.

Thus, after the motor speed reaches a preset speed, the motor speed gradually decreases, but the motor does not stop completely. Therefore, even if the power supplied to the motor to increase the rotation speed of the motor after the elapse of the predetermined period is increased,
The driving force of the motor does not suddenly act on the rotating body.
Therefore, it is possible to suppress the generation of an impact sound due to a sudden drive force of the motor acting on the rotating body.

Further, since the conduction angle of the triac is gradually increased, there is no large difference between the phase of the voltage supplied to the motor and the phase of the current, and the amount of electric power supplied to the motor becomes too small. It is less likely that such a problem will occur. Furthermore, after a predetermined period has elapsed,
The conduction angle of the triac element is gradually reduced, and the power supplied to the motor is gradually increased. Thus, the driving force of the motor is gradually transmitted to the rotating body, so that it is possible to more effectively suppress the generation of a striking sound due to the abrupt application of the driving force of the motor to the rotating body.

[0012] The invention according to claim 2 further comprises a timer for measuring an elapsed time from a point in time when the motor rotation speed detected by the rotation speed detection means reaches the preset rotation speed, and The motor control device according to claim 1, wherein the predetermined time is a predetermined time measured by the timer. According to the configuration of claim 2,
The control for increasing the rotation speed of the motor is started every time a predetermined time elapses after the rotation speed of the motor reaches the predetermined rotation speed, so that even if the driving force suddenly acts on the rotating body, Even if a sound is generated, the impact sound is generated periodically. Therefore, it is possible to reduce the risk of giving a discomfort due to the impact sound.

According to a third aspect of the present invention, the conduction angle setting means sets the conduction angle of the triac to an angle out of a predetermined angle range including 90 °. It is a motor control device. According to the configuration of the third aspect, the conduction angle of the triac is not set to an angle within a predetermined angle range around 90 °. As a result, it is possible to suppress the generation of electromagnetic noise due to conduction of the triac near the phase angle of 90 °.

According to a fourth aspect of the present invention, there is provided a washing tub capable of storing washing water, a pulsator rotatably disposed in the washing tub, and a dehydrating tub capable of storing laundry to be dehydrated. A motor for rotating and driving the pulsator and the dewatering tank, and a motor control means for controlling the rotation of the motor, wherein the motor control device according to any one of claims 1 to 3 includes: A washing machine characterized by being applied.

According to the fourth aspect of the present invention, since the motor control device according to any one of the first to third aspects is applied, the driving force of the motor suddenly acts on the dewatering tank and the pulsator. Thus, the washing machine is less likely to generate an impact sound. Claim 2
In the case where the motor control device described above is applied, even if a striking sound is generated, the striking sound is periodically generated, so that the user is less likely to feel distrust of the washing machine. be able to.

According to a fifth aspect of the present invention, there is provided a method for controlling a motor for generating a driving force for rotating a rotating body, wherein the step of detecting the number of rotations of the motor and the step of setting the number of rotations of the motor are preset. A step of gradually decreasing the number of rotations of the motor for a predetermined period after reaching the number of rotations, and a step of gradually reducing the number of rotations of the motor after the elapse of the predetermined period until the number of rotations of the motor reaches the predetermined number of rotations again. Gradually increasing the number of revolutions.

According to the fifth aspect of the present invention, when the rotation speed of the motor reaches a predetermined rotation speed, the motor is controlled so that the motor rotation speed gradually decreases. Also,
At a point in time when a predetermined period has elapsed since the start of the control for reducing the motor rotation speed, the control of the motor is switched to the control for increasing the motor rotation speed, and the rotation speed of the motor is gradually increased. .

Thus, since the driving force of the motor is gradually transmitted to the rotating body, it is possible to suppress the generation of an impact sound due to the sudden application of the driving force of the motor to the rotating body. Also, instead of controlling the rotation angle of the motor by controlling the conduction angle of the triac, for example, control is performed so as to gradually increase the signal width of the gate signal input to the triac in synchronization with the zero cross of the power supply voltage. With this method, generation of electromagnetic noise from the motor due to the phase control can be suppressed.

According to a sixth aspect of the present invention, the method further includes the step of starting to measure an elapsed time from the time when the rotation speed of the motor has reached the preset rotation speed. 6. The motor control method according to claim 5, wherein a predetermined time has elapsed since the start of the motor control. According to the method described in claim 6, the control for increasing the rotation speed of the motor is started every time a predetermined time elapses after the rotation speed of the motor reaches the predetermined rotation speed. Even when a striking sound is generated due to a sudden action of a force, the striking sound is periodically generated. Therefore, it is possible to reduce the risk of giving a discomfort due to the impact sound.

[0020]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a side sectional view showing a simplified configuration of a fully automatic washing machine according to one embodiment of the present invention. The appearance of this fully automatic washing machine is constituted by a box-shaped housing 1 having an opening on the upper surface. Inside the housing 1, there are provided an outer tub 2 suspended from the housing 1 by a suspension rod (not shown) with a spring, and an inner tub 3 provided in the outer tub 2. The laundry can be accommodated in the inner tub 3 through the upper surface opening of the housing 1. The inner tub 3 is formed with a number of small holes 3 a, and the washing water supplied to the inner tub 3 is stored in the outer tub 2.

Above the outer tub 2, a detergent accommodating portion 4 for storing a detergent used for washing is formed. The other end of the water supply channel 5 whose one end protrudes from the upper surface of the housing 1 is connected to the detergent accommodating portion 4. A water supply hose 6 extending from, for example, a water tap (not shown) is connected to a portion of the water supply channel 5 protruding from the upper surface of the housing 1. Further, a water supply valve 7 constituted by, for example, a solenoid valve is interposed in the middle of the water supply passage 5. With this configuration, when the water supply valve 7 is opened, tap water is supplied from the tap water tap (not shown) to the detergent container 4 through the water supply hose 6 and the water supply path 5. The tap water supplied to the detergent container 4 flows into the inner tank 3 together with the detergent contained in the detergent container 4, and is stored in the outer tank 2.

A drain port 8 is formed at the bottom of the outer tub 2 to discharge the washing water stored in the outer tub 2 to the outside of the machine. A drain pipe 9 extending outside the housing 1 is connected to the drain port 8. In the middle of the drain pipe 9, for example, a drain valve 1 opened and closed by a torque motor (not shown)
When the drain valve 10 is opened, the washing water stored in the outer tub 2 is discharged through the drain pipe 9 to the outside of the machine.

The inner tub 3 serves as both a washing tub and a dewatering tub, and as described above, a number of fine dewatering holes (small holes) 3a are formed on the peripheral surface thereof. At the bottom of the inner tank 3,
A pulsator 11 for stirring the washing water stored in the outer tub 2 to generate a water flow is provided. The inner tub 3 and the pulsator 11 are supported by an output shaft 13 of a bearing 12 provided below the outer tub 2 so as to be rotatable forward and backward.

At the bottom of the housing 1, there are provided a motor 14 for generating a driving force for rotating the inner tank 3 and the pulsator 11, and a drive transmitting mechanism 15 for transmitting the rotating force of the motor 14 to the bearing 12. Have been. The drive transmission mechanism 15 spans a small pulley 17 fixed to an output shaft 16 of the motor 14, a large pulley 19 fixed to a lower end of an input shaft 18 of the bearing 12, and a small pulley 17 and a large pulley 19. Belt 20 is included. Motor 14
Is transmitted to the large pulley 19 via the small pulley 17 and the belt 20, and further transmitted to the bearing 12 via the input shaft 18.

The bearing 12 has a built-in clutch (not shown) so that the inner tank 3 and the pulsator 11 can be driven individually. The output shaft 13 of the bearing 12 is constituted by a double shaft. ing. For example, at the time of washing and rinsing, the driving force of the motor 14 is transmitted to the pulsator 11 via the bearing 12, and the pulsator 11 is rotated forward and backward. At the time of dehydration, the driving force of the motor 14 is transmitted to both the inner tub 3 and the pulsator 11, and the inner tub 3 and the pulsator 11 are rotated in one direction at high speed, and the laundry in the inner tub 3 is dehydrated by centrifugal force. You.

FIG. 2 is a block diagram showing an electric configuration of the fully automatic washing machine, and particularly shows a portion related to driving of the motor 14. Motor 14 is a triac 2
The motor 14, the commercial AC power supply 21, and the triacs 22 and 23 form a series circuit. Specifically, the motor 14 and the right-turning triac 22 are connected in series to the commercial AC power supply 21 to form a circuit for rotating the motor 14 to the right. Further, the motor 14 and the left-rotating triac 23 are connected to the commercial AC power supply 2.
1 to form a circuit for rotating the motor 14 counterclockwise. Reference numeral 24 denotes a capacitor for smoothing the voltage from the AC power supply 21.

The AC power supply 21 has a zero cross detection circuit 2 for detecting a zero cross point of an AC voltage applied to the motor 14 from the AC power supply 21 and outputting a zero cross signal.
5 is connected in parallel with the motor 14. The zero cross signal from the zero cross detection circuit 25 is input to a microcomputer 26 for controlling the operation of each part of the washing machine. The microcomputer 26 is
By applying a gate signal to the triacs 22 and 23 at a predetermined timing based on the zero-cross signal input from the zero-cross detection circuit 25, the triac 2
2 and 23 are controlled on / off.

The AC power supply 21 further includes a 5 V power supply circuit 2.
7 is connected in parallel with the motor 14. The 5V power supply circuit 27 reduces the AC voltage (for example, 100V) from the AC power supply 21 to 5V DC and applies it to the microcomputer 26 as a drive voltage. It has become. The microcomputer 26 is connected to a rotation sensor 28 that outputs one pulse each time the motor 14 makes a half turn, for example. Rotation sensor 28
May be constituted by, for example, a magnet (not shown) fixed to the output shaft 16 or the small pulley 17 of the motor 14, and a reed switch (not shown) that is turned on each time the magnet passes near the magnet. it can.

The microcomputer 26 has a ROM 29 storing a program for controlling the operation of each unit,
A RAM 30 that functions as a work area when executing a program stored in the ROM 29 and a timer 31 that measures the operation time of each unit are built in. The ROM 29 stores a phase data table 32 used in a dehydration control process described later, in addition to the control program described above. The phase data table 32 is a table in which the output timing of the gate signal when the rotation speed of the motor 14 is increased or decreased is tabulated.
Is shown in The phase data table 32 is 50 Hz
Up time data table, 60 Hz Up time data table, 50 Hz Down time data table and 60 Hz
It includes four data tables of the downtime data table.

50 Hz Up Data Table and 60
The HzUp data table shows that the power supply frequency is 5
This is a table used when increasing the rotation speed of the motor 14 at 0 Hz and 60 Hz. 5
When the address X (X = 1 to 10) of the 0 Hz Up data table and the 60 Hz Up data table is designated, the data (the conduction angle of the triacs 22, 23) stored at the designated address is output.

The 50-Hz down-time data table and the 60-Hz down-time data table are tables used to reduce the rotation speed of the motor 14 when the power supply frequency is 50 Hz and 60 Hz, respectively. 50Hz Down time data table and 60H
Address X of the data table at the time of zDown (X = 1 to
When 5) is designated, the data (the conduction angle of the triacs 22, 23) stored at the designated address is output.

The RAM 30 has flags 33 to 38 and a counter 39 which are used in a dehydration control process described later.
To 41 are included. Motor up / down flag 33
Represents whether the rotation speed of the motor 14 is increased or decreased. When the motor up / down flag 33 is set, the control for reducing the rotation speed of the motor 14 is performed.
Is controlled to increase the number of rotations.

The Hz determination flag 34 is a flag indicating whether the frequency of the AC power supply 21 is 50 Hz or 60 Hz, and is set when the frequency is 50 Hz and reset when the frequency is 60 Hz. The motor right flag 35 indicates that the motor 1
4 is a flag indicating whether or not to rotate the motor 1 clockwise.
Set when rotating 4 clockwise. The motor left rotation flag 36 is a flag indicating whether or not the motor 14 is rotated left, and is set when the motor 14 is rotated left. In the dewatering process, only the motor right flag 35 is set, and the motor left flag 36 is not set.

The rotation interruption cancel flag 37 is a flag used in the rotation interruption processing shown in FIG. 6, and determines whether the rotation speed of the motor 14 has reached a predetermined minimum rotation speed (60 rpm in this embodiment). Represents. The rotation interrupt cancel flag 37 is set when the rotation speed of the motor 14 is equal to or lower than the minimum rotation speed, and is set when the rotation speed is equal to or higher than the minimum rotation speed.

The rotation interrupt start flag 38 is a flag that is set when new rotation width data is obtained in the rotation interrupt processing shown in FIG. 6, and in response to the setting of this flag, The rotation speed process shown in FIG. 7 is started. The motor down time counter 39 is a counter for measuring the time since the motor up / down flag 33 was set. The rotation up counter 40
In the rotation speed process shown in FIG. 7, this is a counter indicating the number of times that the rotation speed of the motor 14 is detected to be equal to or higher than a predetermined target rotation speed. Also, the zero-cross counter 41
Is a counter indicating the number of times the zero-cross signal has been input from the zero-cross detection circuit 25.

The timer 31 includes a phase timer 42 used in the phase control processing shown in FIGS. 9 to 11, a rotation width timer 43 used in the rotation interrupt processing shown in FIG. 6, and a time shown in FIG. A 0.1 second timer 44 used in the counting process is included. FIG. 4 is a flowchart illustrating an example of a control operation performed by the microcomputer 26.

When the power of the fully automatic washing machine is turned on, the microcomputer 26 stores the RAM 30 and the timer 31
(Step S1). In this initial setting, the flags 34 to 38 and the counters 39 to 41 in the RAM 30 are reset, and the phase timer 4
2. The rotation width timer 43 and the 0.1 second timer 43 are each reset.

When the initialization of the RAM 30 and the timer 31 is completed, the microcomputer 26 determines whether the frequency of the AC power supply 21 is 50 Hz or 60 Hz (step S2). And the AC power supply 21
Is 50 Hz, the Hz determination flag is set to 1 (step S3), and if the frequency is 60 Hz, the Hz determination flag is set to 0 (step S3).
4).

Thereafter, for example, when an operation unit (not shown) arranged on the front side of the upper surface of the housing 1 (see FIG. 1) is operated and a start signal is input to the microcomputer 26 (YES in step S5). The microcomputer 26 executes a series of washing operations including a washing step, a rinsing step, and a dehydration step in accordance with the program stored in the ROM 30 (step S6).

FIGS. 5 to 11 are flowcharts showing the flow of control of the motor 14 during the spin-drying process. Referring to FIG. 5, the washing operation proceeds in step S6 shown in FIG.
When the dehydration process is started, the motor right flag 35 and the rotation interrupt cancel flag 37 are set,
10 is set in the zero cross counter 41 (step T1). All flags and counters other than the motor right flag 35, the rotation interrupt cancel flag 37, and the zero-cross counter 41 are reset (cleared).

When the dewatering process is started, the drain valve 1
0 (see FIG. 1) is opened, and the measurement of the elapsed time from when the drain valve 10 is opened is started. And
When 10 seconds have elapsed since the opening of the drain valve 10 (YES in step T2), a dehydration control process described below is executed (step T3). FIG. 6 shows the dehydration control process.
, A rotation speed process shown in FIG. 7, a time counting process shown in FIG. 8, and a phase control process shown in FIGS. 9 to 11. These processes are performed in parallel by the microcomputer 26. It is done.

First, the rotation interrupt processing will be described with reference to FIG. The rotation interruption process is a process for acquiring the time required for the motor 14 to make a half rotation as rotation width data corresponding to the rotation speed of the motor 14. This rotation interruption processing corresponds to the function of the rotation speed detecting means. When the rotation interruption process is started, the microcomputer 26 checks the state of the rotation interruption cancel flag 37 indicating whether the rotation speed of the motor 14 has reached a predetermined minimum rotation speed (for example, 60 rpm) ( Step P1). Since the rotation cancel flag 37 is set in step T1 in FIG. 5, immediately after the rotation of the motor 14 is started, it is determined that the rotation cancel flag 37 is 1, and the process proceeds to step P2.

In step P2, the rotation width data is set to 0.5 seconds as an initial value.
Stored in the AM 30. The rotation width data is a time required for the motor 14 to make a half rotation, and 0.5 seconds set as an initial value is a value corresponding to a predetermined minimum rotation speed of 60 rpm. When the rotation width data is set to 0.5 seconds, the rotation interrupt cancel flag 37 is reset (step P3), and the rotation width timer 43 is set to 0.5 seconds (step P4). Then, the rotation width timer 43 is started (Step P5).

In steps P6 and P7, the remaining time of the rotation width timer 43 and the rotation state of the motor 14 are constantly monitored. That is, in step P6, it is determined whether or not the rotation width timer 43 has timed out.
If the time has not elapsed for No. 3 (NO in step P6), it is determined in step P7 whether the motor 14 has rotated by half. The determination as to whether or not the motor 14 has made a half rotation is made based on the input of the detection pulse from the rotation sensor 28.

When the rotation speed of the motor 14 is smaller than the minimum rotation speed of 60 rpm or less, for example, immediately after the rotation of the motor 14 is started, the rotation timer 43 times out before the motor 14 makes a half rotation (step). (YES at P6),
The rotation interrupt cancel flag 37 is set (step P8). Then, this rotation interrupt processing returns,
In step P1, the state of the rotation interrupt cancel flag 37 is checked again. At this time, since the rotation interrupt cancel flag 37 is set to 1, the subsequent steps P2 to P
8 is executed.

While the processes in steps P1 to P8 are repeated, the rotation speed of the motor 14 is reduced to the minimum rotation speed of 60.
When the rotation speed reaches not less than rpm, while the rotation width timer 43 measures 0.5 seconds (NO in step P6), the rotation sensor 28
Is input to the microcomputer 26. Then, the determination in step P7 is affirmed, and the rotation interrupt processing returns with the rotation interrupt cancel flag 37 being reset. Thereafter, when the rotation interrupt processing is started again, the rotation interrupt cancellation flag 37 is still reset. Therefore, it is determined in step P1 that the rotation interrupt cancellation flag is 0, and the process proceeds from step P1 to step P9. move on.

In step P9, a rotation interrupt start flag 38 indicating that the rotation width data (the number of rotations of the motor 14) has been obtained is set. Next, the rotation sensor 28
, The remaining time of the rotation width timer at the time when the detection pulse is input to the microcomputer 26 is subtracted from 0.5 seconds, and the obtained value is used as the rotation width data as RA.
It is stored in M30 (step P10). That is, in step P10, the time required for the motor 14 to make a half rotation is stored in the RAM 30 as rotation width data.

Thereafter, in step P4, the rotation width timer is set to 0.5 seconds again, and in steps P5 to P7,
It is checked whether or not the motor 14 makes a half turn within 0.5 seconds. Then, within 0.5 seconds, the motor 14
When the motor 14 rotates, the time required for the motor 14 to make a half rotation at this time is stored in the RAM 30 as new rotation width data.
Is stored in

By repeatedly executing the rotation interrupt processing in this manner, rotation width data corresponding to the rotation speed of the motor 14 is obtained every time the motor 14 is rotated by half at a rotation speed of 60 rpm or more. Is done. The rotation speed process shown in FIG. 7 is a process for detecting whether or not the rotation speed of the motor 14 has reached a predetermined target rotation speed. In the above-described rotation interruption process (see FIG. 6), a new rotation speed process is performed. It is executed every time the width data is acquired and the rotation interrupt start flag 38 is set.

Referring to FIG. 7, when the rotation interrupt start flag 38 is rewritten to 1 in the above-described rotation interrupt processing,
At step U1, it is detected that the rotation interrupt start flag 38 has been set, and the routine proceeds to step U2, where the rotation interrupt start flag 38 is reset. Then, a value corresponding to a predetermined target rotation speed is stored in the RAM 30 as the target rotation width data (step U3).

Next, the microcomputer 26 sets R
The target rotation width data stored in the AM 30 is compared with the rotation width data acquired in the above-described rotation interruption processing to determine whether the rotation width data is equal to or less than the target rotation width data (step U4). . If the rotation width data is larger than the target rotation width data (NO in step U4), it is determined that the rotation speed of the motor 14 has not reached the target rotation speed,
Skipping to step U10, the rotation up counter 40 of the RAM 30 is cleared. Then, the rotation speed process returns.

Thereafter, when the motor 14 rotates by １ ／ and the rotation interrupt start flag is rewritten to 1 in the above-described rotation interrupt processing, the rotation speed processing is executed again. When the rotation speed of the motor 14 reaches the target rotation speed and the rotation width data becomes equal to or smaller than the target rotation width data while the rotation speed processing is repeatedly executed, the rotation width data is equal to or smaller than the target rotation width data in step U4. Is affirmative, and the rotation up counter 40 is incremented in step U5.

In step U6, the rotation up counter 4
The count value of 0 is checked to determine whether the count value is 3 or more. At this time, since the count value of the rotation up counter 40 is 1, the determination in step U6 is denied, and the rotation speed process returns. When the rotation speed process is further repeatedly performed and the rotation width data is detected to be equal to or smaller than the target rotation width data three consecutive times, it is determined in step U6 whether the value of the rotation up counter 40 is 3 or more. Is affirmed. Then, the process proceeds to step U7, in which the motor up / down flag 33 is set.
Then, in step U8, the motor down time counter 39
Is cleared, and in step U9, the zero-cross counter 41
Is cleared and the rotation up counter 40 is cleared in step U10, and then the rotation speed process returns.

Next, the time counting process will be described with reference to FIG. The time counting process is performed when the elapsed time from when the motor up / down flag 33 is set in the above-described rotation speed process (see FIG. 7) reaches a predetermined time (2 seconds in this embodiment). This is a process for resetting the flag 33.

The time counting process is a process that is always executed while the spinning is being performed, and uses a 0.1 second timer 44 built in the microcomputer 26. When the time counting process is started, 0.1 second is set in the 0.1 second timer 44 (step V1), and this 0.1 second is set.
The second timer 44 is started (Step V2). When the 0.1 second timer 44 times out (YES in step V3), the motor up / down flag 33
Is checked (step V4).

As described above, the motor up / down flag 33 is in a reset state until the rotation speed of the motor 14 reaches the predetermined target rotation speed and is set in the rotation speed processing shown in FIG. Therefore, until the rotation speed of the motor 14 reaches the target rotation speed, it is determined in step V4 that the motor up / down 33 has been reset, and the time counting process returns.

When the number of revolutions of the motor 14 reaches the target number of revolutions, the motor up / down flag 33 is set, so that the process proceeds from step V4 to step V5, where the motor down time counter 39 is incremented. And
In step V6, it is checked whether or not the value of the motor down time counter 39 is larger than 20. This time counting process returns until the value of the motor down time counter 39 reaches 20.

When the time count process is repeatedly performed and the value of the motor down time counter 39 becomes larger than 20, it is determined in step V6 whether the value of the motor down time counter 39 is larger than 20. In step V7, the zero-cross counter 41 is reset.
Then, the motor up / down flag 33 is reset (step V8), and the time counting process returns.

As described above, in the time counting process, FIG.
Motor up / down flag 3
The elapsed time from when 3 is set is monitored, and when 2 seconds have elapsed since the motor up / down counter 33 was set, the motor up / down flag 33 is reset. The phase control process shown in FIGS. 9 to 11 is a process for controlling the output timing and output time of the gate signal given to the triacs 22 and 23. Is executed each time zero crossing is performed.

More specifically, the microcomputer 26 firstly executes the zero-cross detection circuit 2 in step E1.
It is determined from 5 whether a zero-cross signal has been input.
Until the input of the zero-cross signal is detected in step E1, the processing after step E2 is not performed, and the phase control processing returns. When a zero-cross signal is input from the zero-cross detection circuit 25 to the microcomputer 26, the zero-cross counter 41 is incremented (step E2). At the start of the dehydration process, 10 is set in the zero-cross counter 41, so that the zero-cross counter 41 is rewritten from 10 to 11 at this time. Thereafter, the microcomputer 26 checks the state of the motor up / down flag 33 indicating whether or not the rotation speed of the motor 14 has reached a predetermined target rotation speed (step E3).

Since the motor up / down flag 33 has been reset at the start of the dehydration process, immediately after the start of the dehydration process, the motor up / down flag is determined to be 0 in step E3, and then the zero cross counter is determined in step E4. It is determined whether 41 is greater than 10. Since the zero-cross counter 41 has been rewritten to 11 in step E2, the determination in step E4 is affirmed at this time, the process proceeds to step E5, and the zero-cross counter 41 is set to 1
Rewritten to 0. Thereafter, 0 is stored as an output start time of the gate signal in an On start time memo provided in the RAM 30 (step E6). The gate signal output start time is the time from when the power supply voltage crosses zero to when the gate signal starts to be output.
This output start time of the gate signal is simply referred to as “On start time”.

When the On start time is stored in the On start time memo in step E6, the process proceeds to step E7 in FIG. 10, and in steps E7 to E13, the output of the gate signal is started after the output of the gate signal is started. The time until the operation is stopped (hereinafter referred to as “On output time”) is stored in an On output time memo provided in the RAM 30. Specifically, in step E7, the microcomputer 2
6, the state of the Hz determination flag 34 is checked. H
When the z determination flag 34 is set (when the power supply frequency is 50 Hz), the On start time stored in the On start time memo indicates that the phase of the power supply voltage at the frequency 50 Hz advances from zero crossing to 90 °. It is determined whether the time is shorter or longer than the time (hereinafter referred to as “50 Hz 90 ° data”) (step E8). And On
If the start time is shorter than the 90 ° data at 50 Hz, the time obtained by subtracting the On start time from the time required for the phase of the power supply voltage at the frequency of 50 Hz to progress from zero cross to 95 ° is provided in the RAM 30 as the On output time. The stored On output time memo is stored (Step E9).
If the On start time is longer than the 90 ° data at 50 Hz, the time required for the phase of the AC voltage having the frequency of 50 Hz to advance by 5 ° is stored in the On output time memo as the On output time (step E10). ).

On the other hand, when the Hz determination flag 34 is reset (when the power supply frequency is 60 Hz), the process proceeds from step E7 to step E11, where the On start time stored in the On start time memo is set to the frequency of 60 Hz. It is determined whether the phase of the power supply voltage is longer or shorter than the time required for the phase to advance from zero crossing to 90 ° (hereinafter referred to as “60 Hz 90 ° data”). If the On start time is shorter than the 90 ° data of 60 Hz, the frequency 6
The time obtained by subtracting the On start time from the time required for the phase of the 0 Hz power supply voltage to advance from zero crossing to 95 ° is stored in the On output time memo provided in the RAM 30 as the On output time (step E12). Also, O
If the n start time is longer than the 90 ° data at 60 Hz, the time required for the phase of the power supply voltage at the frequency of 60 Hz to advance by 5 ° is stored in the On output time memo as the On output time (step E13).

For example, assuming that the frequency of the AC power supply 21 is, for example, 60 Hz, the On start time stored in the On start time memo is 0. Is determined to be shorter than the frequency of 60 Hz in step E12.
The time obtained by subtracting the On start time (= 0) from the time required for the phase of the power supply voltage to become 95 ° from the zero cross is set as the On output time.

When the On start time and the On output time are stored in the On start time memo and the On output time memo, respectively, the process proceeds to step E14 in FIG.
The O stored in the On start time memo in the phase timer 42
The n start time is set, and the phase timer 42 is started (step E15). At this time, since 0 is stored as the On start time in the On start time memo, 0 is set in the phase timer 42, and the phase timer 42 times out immediately after the start (step E1).
6). Then, when the time-up of the phase timer 42 is detected, the input of the gate signal to the right rotation triac 22 is started (steps E17 and E18). That is,
Immediately after the start of the dehydration process, a gate signal is started to be input to the right rotation triac 22 almost simultaneously with the zero cross of the power supply voltage, and the motor 14 starts rotating clockwise.

If the motor right flag 35 is reset in a step other than the dehydration step, the process proceeds from step E17 to step E19, where the motor left flag 3
The state of 6 is examined. If the motor left flag 36 is set, the input of the gate signal to the left rotation triac 23 is started (step E20), and the motor 14 starts rotating counterclockwise.

At step E18, the right rotation triac 2
When the input of the gate signal to 2 starts, the On output time stored in the On output time memo is newly set in the phase timer 42 (step E21), and the phase timer 42 is restarted (step E21). Step E22). When the phase timer restarted in step E22 times out (YES in step E23), the gate signal input to the triac 22 is turned off (step E24), and the phase control process returns.

Thereafter, in the rotation speed process shown in FIG. 7, it is detected that the motor rotation speed has reached the predetermined target rotation speed, and a zero-cross signal is sent to the microcomputer 26 until the motor down flag is rewritten to 0. Each time an input is made, the above-described phase control processing in steps E1 to E24 is performed. As described above, from the start of the dehydration process until the rotation speed of the motor 14 reaches the predetermined target rotation speed, the On start time is set to 0, and the gate signal is output at the same time as the zero cross of the power supply voltage.
, And is turned off when the phase angle of the AC voltage reaches 95 °. As a result, as shown in FIG. 12, the motor 14 is started with the maximum torque, and the rotation speed of the motor 14 rises sharply.

When the rotation speed of the motor 14 increases and the rotation speed of the motor 14 reaches a predetermined target rotation speed, the motor up / down flag 3
3 is rewritten to 1. After that, when the zero-cross signal is input to the microcomputer 26 and the phase control process shown in FIG. 9 is executed, the value of the zero-cross counter 41 cleared in step U9 of the rotation speed process is incremented in step E2. . Then, in step E3, it is determined that the motor up / down flag 33 is in the set state, and the process proceeds from step E3 to step E2.
Proceed to 5.

At step E25, the value of the zero-cross counter 41 is checked to determine whether or not the value of the zero-cross counter 41 is larger than 5. At this time, since the zero-cross counter 41 has been rewritten to 1 in step E2, the zero-cross counter becomes 5 in step P25.
The determination as to whether or not it is larger is denied. Then, in step E26, the value of the zero-cross counter (==) as the address value X to be given to the phase data table shown in FIG.
1) is set.

When the address value X of the phase data table is set at step E26, the microcomputer 26
Thereby, the state of the Hz determination flag is checked (step E27). And the frequency of the AC power supply 21 is 50 Hz
In the case of, 5 included in the phase data table 32
Data corresponding to the address X (the conduction angle of the triac 22.23) is read from the 0 Hz Down time data table, and the time corresponding to the read data is stored in the On start time memo (step E28). When the frequency of the AC power supply 21 is 60 Hz, data corresponding to the address X is read from the 60 Hz Down time data table included in the phase data table 32,
The time corresponding to the read data is stored in the On start time memo (step E29).

At this time, since the value of the zero cross counter 41 is 1, for example, the frequency of the AC power supply 21 is 60
In the case of Hz, data 20 ° corresponding to address 1 is read from the 60 Hz Down time data table shown in FIG. Then, the On start time corresponding to the read data 20 ° is stored in the On start time memo. When the On start time is stored in the On start time memo at step E24, the processes of steps E7 to E13 in FIG. 10 are performed, and the On output time corresponding to the On start time is stored in the On output time memo. . That is, the On start time is data 2
When set based on 0 °, the On start time is 6
Since the On output time memo is smaller than the 90 ° data of 0 Hz, the On start time (the time corresponding to the data of 20 °) is subtracted from the time required for the phase of the AC voltage having the frequency of 60 Hz to become 95 ° from the zero cross. Is stored.

Thereafter, the processing of steps E14 to E24 in FIG. 8 is performed, and the timing based on the On start time and the On output time stored in the On start time memo and the On output time memo, respectively, in the right rotation triac 22. Inputs a gate signal. That is, the gate signal input to the triac 22 is turned on at a time corresponding to the phase angle of 20 ° of the power supply voltage having a frequency of 60 Hz, and is turned off at a time corresponding to the phase angle of 95 ° of the power supply voltage. as a result,
Since the timing at which the gate signal is given to the triac 22 is later than immediately after the start of the spin-drying process, FIG.
As shown in (b), the power supplied to the motor 14 decreases.

After the processes of steps E14 to E24 in FIG. 11 are performed, the phase control process returns, and if the input of the zero-cross signal is detected in step E1, the zero-cross counter 41 is incremented in step E2. , The value of the zero-cross counter 41 becomes 2. afterwards,
At step E26, 2 is set to the address X, and the above-described processing after step E27 is performed. This allows
When the value of the zero-cross counter 41 is 2, the gate signal input to the triac 22 is turned on at a time corresponding to the phase angle 40 ° of the power supply voltage having a frequency of 60 Hz,
It is turned off at a time corresponding to a phase angle of 95 ° of the power supply voltage.

As described above, the phase control process is repeatedly executed, and when the value of the zero-cross counter 41 becomes 5, the address X is set to 5 in step E26. Then, the data 135 ° corresponding to the address 5 is read from the data table at the time of 60 Hz Down, and the data 1 is read.
The time corresponding to 35 ° is set as the On start time. Also,
At this time, since the On start time is longer than the 90 ° data of 60 Hz, the time required for the phase of the AC voltage having the frequency of 60 Hz to advance by 5 ° is set as the On output time. Thereafter, the gate signal input to the triac 22 is turned on at a time corresponding to the phase angle of the power supply voltage having a frequency of 60 Hz corresponding to 135 ° and turned off at a time corresponding to the phase angle 140 ° of the power supply voltage (step E14). To 24).

Thereafter, when the zero-cross signal is further input to the microcomputer 26 and the phase control process is started, the value of the zero-cross counter 41 is incremented to 6 at step E2. Then, step E2
At 5, the determination as to whether the value of the zero-cross counter 41 is greater than 5 is affirmed, and the process proceeds from step E <b> 25 to step E <b> 30, where the value of the zero-cross counter 41 is rewritten to 5.

Next, the state of the Hz determination flag 34 is checked (step E31). If the Hz determination flag 34 has been reset, it is necessary for the phase of the AC voltage having a frequency of 50 Hz to be 140 ° from the zero cross. The time is stored in the On start time memo of the RAM 30 as the On start time (step E32). When the Hz determination flag 34 is set, the time required for the phase of the AC voltage having the frequency of 60 Hz to change from zero cross to 135 ° is stored in the On start time memo of the RAM 30 as the On start time ( Step E33).

That is, when the value of the zero-cross counter 41 is 6
, The On start time is not set based on the data read from the phase data table 32 with the value of the zero cross counter 41 as the address X, but the frequency 60
The time required for the phase of the AC voltage of Hz to change from zero cross to 135 ° is set as the On start time. In other words, when the value of the zero-cross counter 41 becomes 6,
Thereafter, the gate signal is turned on at a fixed phase angle of 135 ° and turned off at a fixed phase angle of 140 °. afterwards,
The above-described control processing performed to reduce the rotation speed of the motor 14 is continued until a predetermined time (for example, 2 seconds) elapses after the rotation speed of the motor 14 reaches a predetermined target rotation speed.

According to the above-described control processing, as shown in FIG. 13A, the triac 2 is provided every time the power supply voltage crosses zero until the value of the zero cross counter 41 reaches 6.
2 is gradually increased. As a result, the motor 1
4, the amount of power supplied to the motor 4 decreases, and as shown in FIG. 12, the rotation speed of the motor 14 gradually decreases. Then, after the value of the zero-cross counter 41 becomes 6, the conduction angle of the triac 22 is fixed, and a constant amount of power is continuously supplied to the motor 14.

Accordingly, although the rotation speed of the motor 14 gradually decreases, the motor 14 does not stop completely, and thereafter, the power supplied to the motor 14 to increase the rotation speed of the motor 14 is increased. Even if is increased,
It is less likely that a striking sound is generated due to the driving force of the motor 14 acting on the inner tank 3 abruptly. FIG.
When the conduction angle of the triac 22 is suddenly changed from 0 ° to 140 ° as in the conventional motor control shown in FIG. 2B, the phase of the voltage supplied to the motor 14 and the phase of the current are greatly shifted. I will. As a result, depending on the conduction angle of the triac 22, the amount of electric current (the amount of electric power) supplied to the motor 14 becomes extremely small.

In the phase control processing according to this embodiment,
As shown in FIG. 13B, the conduction angle of the triac 22 is gradually increased from 0 °, and finally the conduction angle of the triac 22 is 140 ° (50 Hz) or 135 °.
(60HZ). As a result, since there is no large difference between the voltage phase and the current phase, it is possible to prevent the amount of power supplied to the motor 14 from becoming too small.

Further, as a result of repeated experiments of turning on the triac 22 at timings corresponding to various conduction angles from 0 ° to 180 °, the inventor of the present application has found that when the phase angle of the power supply voltage is around 90 °, the triac 22 is turned on. When a gate signal is given to the motor, the result that electromagnetic noise is generated from the motor 14 was obtained. Therefore, in the phase control process according to this embodiment, as apparent from FIG. 3 or FIG. 13A, for example, when the power supply frequency is 60 Hz, the value of the zero-cross counter 41 is 2 At times, the conduction angle of the triac 22 is set to 20 °, and when the value of the zero-cross counter 41 is 3, the conduction angle of the triac 22 is set to 110 °. In other words, triac 22
Is not set to an angle within a certain range around 90 °. Thereby, the triac 22
Can be suppressed from being generated due to conduction around the phase angle of 90 °.

In this embodiment, the processing in steps E25 to E33 described above corresponds to the function of the rotation speed reducing means. By the way, in the conventional motor control, after the motor rotation speed reaches the target rotation speed, control for lowering the motor rotation speed is executed, and when the motor rotation speed falls to the predetermined lower limit rotation speed, the motor is re-started. Control for increasing the rotation speed is executed. Therefore, in this conventional motor control, the time required for the motor rotation speed to drop to the predetermined lower limit rotation speed is not constant, and, for example, when the power supply to the motor is started, the driving force of the motor is suddenly applied to the dehydration tub. The impact sound produced by the action appears irregularly.
Then, a blow sound is suddenly generated during the dehydrating operation, and the user has a distrust of the washing machine.

Therefore, in the dehydration control process according to this embodiment, the motor 1 is used in the time counting process shown in FIG.
The time from the start of the control for lowering the rotation speed of the motor 4 is monitored, and when a predetermined time (for example, 2 seconds) has elapsed, the above-described control processing for lowering the motor rotation speed is terminated. Then, control processing for increasing the rotation speed of the motor 14 is performed. Accordingly, even if a striking sound is generated when the driving force of the motor 14 acts on the dewatering tub, the striking sound is periodically generated, so that the user may be less likely to feel distrust. . This is one of the features of this embodiment.

A specific description will be given. As described above, in the time counting process (see FIG. 8), when it is detected that a predetermined time has elapsed since the motor up / down flag 33 was set, the motor up / down flag 33 and the zero cross counter 41 are reset. . And
Thereafter, the zero-cross signal is sent to the microcomputer 26.
When the phase control process shown in FIGS. 9 to 11 is started, the zero-cross counter is changed from 0 to 1 in step E2. In step E3, it is determined that the motor up / down flag 33 has been reset. Then, the process proceeds to step E4, where it is determined whether or not the value of the zero-cross counter 41 is larger than 10. At this time, since the value of the zero-cross counter 41 is 1, the determination in step E4 is denied, and the value (= 1) of the zero-cross counter 41 is set to the address X in step E34.

When the value of the zero-cross counter 41 is set to the address X, the microcomputer 26 checks the state of the Hz determination flag (step E35). And
When the frequency of the AC power supply 21 is 50 Hz, data corresponding to the address X is read from the 50 Hz Up time data table included in the phase data table 32, and
The time corresponding to the read data is stored in the On start time memo (step E36). When the frequency of the AC power supply 21 is 60 Hz, the microcomputer 26
Reads the data corresponding to the address X from the 60 Hz Up data table included in the phase data table 32, and stores the time corresponding to the read data in the On start time memo (step E37).

At this time, the value of the zero cross counter 41 is 1
Therefore, for example, if the frequency of the AC power supply 21 is 60H
Assuming the case of z, data 134 ° corresponding to address 1 is read from the 60 Hz Up data table shown in FIG. Then, the time corresponding to the read data 134 ° is stored in the On start time memo. On
When the start time is stored in the On start time memo, the processing of steps E7 to E13 in FIG. 10 is performed, the On output time is determined according to the On start time, and the determined On output time is determined as On output time. Stored in memo.

When the On start time and the On output time are stored in the On start time memo and the On output time memo, respectively, the processing of steps E14 to E24 in FIG. On stored in the On start time memo and the On output time memo, respectively.
A gate signal is input at a timing based on the start time and the On output time. That is, in this case, the gate signal input to the triac 22 is turned on at a time corresponding to the phase angle of 134 ° of the power supply voltage having a frequency of 60 Hz, and is turned off at a time corresponding to the phase angle of 139 ° of the power supply voltage. You.

Thereafter, when the zero-cross signal is further input to the microcomputer 26 and the phase control process is started, the value of the zero-cross counter 41 is incremented to 2 in step E2, and the processes after step E3 are performed. Be executed. In this way, the phase control process for increasing the rotation speed of the motor 14 is repeatedly performed, and when the zero-cross counter 41 becomes 11 in step E2,
In step E4, the determination as to whether the value of the zero-cross counter 41 is greater than 10 is affirmed, and the process proceeds to step E
The process proceeds from step 4 to step E5, and the value of the zero cross counter 41 is rewritten to 10. Then, in step E6,
After 0 is stored in the On start time memo, steps E6 to
The process of E24 is performed. Thereby, the gate signal is
The input to the triac 22 is started simultaneously with the zero crossing of the power supply voltage, and is turned off when the phase angle of the power supply voltage becomes 95 °.

Thereafter, the control process for increasing the rotation speed of the motor 14 is as follows. When the rotation speed of the motor 14 reaches the predetermined target rotation speed, the motor up / down flag 33 is again set in the rotation speed process shown in FIG. Executed repeatedly until set. In the phase control process for increasing the rotation speed of the motor 14, the conduction angle of the triac 22 is gradually reduced until the value of the zero-cross counter 41 becomes 10 as shown in FIG. The power supplied to the power supply is gradually increased. When the value of the zero-cross counter 41 becomes 11, the conduction angle of the triac 22 is set to 0 °, and the gate signal starts to be input to the triac 22 at the same time as the zero cross of the power supply voltage.
The motor 14 is rotated at the maximum torque.

As a result, as shown in FIG. 12, for a while after the control for increasing the rotation speed of the motor 14 is started, the rotation speed of the motor 14 gradually increases.
Therefore, since the driving force of the motor 14 is gradually transmitted to the inner tub 3, it is possible to further effectively suppress the generation of a hitting sound due to the abrupt application of the driving force of the motor 14 to the inner tub 3.

The control process for increasing the rotation speed of the motor 14 is performed for two seconds after the rotation speed of the motor 14 reaches the target rotation speed and the control process for reducing the rotation speed of the motor 14 is started. Since it is started each time, even if a striking sound is generated due to a large rotational force acting on the inner tank 3, the striking sound is periodically generated.
Therefore, the user of the washing machine can be less likely to feel uncomfortable due to sudden occurrence of a blow sound.

Further, for example, when the power supply frequency is 60 Hz, as apparent from FIG. 3 or FIG. 14, when the value of the zero-cross counter 41 is 7, the conduction angle of the triac 22 becomes 110 °. Is set to
When the value of the zero-cross counter 41 is 8, the conduction angle of the triac 22 is set to 60 °. That is, the conduction angle of the triac 22 is not set to an angle within a certain range around 90 °. Therefore, generation of electromagnetic noise due to conduction of the triac 22 near the phase angle of 90 ° can be suppressed.

In this embodiment, the processing of steps E34 to E37 corresponds to the function of the rotation speed increasing means. FIG. 15 is a timing chart for explaining control of the motor according to the second embodiment of the present invention. In the first embodiment described above, the motor rotation speed is adjusted by controlling the conduction angle of the triac 22. On the other hand, in the second embodiment,
The gate signal applied to the triac 22 is output in synchronization with the zero cross of the power supply voltage, the conduction angle of the triac 22 is not controlled, and the signal amount of the gate signal is gradually changed to reduce the amount of power supplied to the motor 14. It controls and adjusts the motor speed.

Hereinafter, referring to FIG. 2 and FIG.
The motor control according to the embodiment
The control when raising the rotation speed of is described. When a predetermined time (for example, 2 seconds) elapses after the rotation speed of the motor 14 reaches the target rotation speed during the spin-drying process, the RAM 3
After the zero-cross counter 41 included in 0 is reset, control for increasing the rotation speed of the motor 14 is started. When the zero-cross signal is input from the zero-cross detection circuit 25 to the microcomputer 26, the zero-cross counter 41 is set to 1 and the output of the gate signal is started (t1).

Thereafter, when a two-pulse zero-cross signal is input to the microcomputer 26 and the count value of the zero-cross counter 41 becomes 3, the output of the gate signal to the triac 22 is stopped (t2). As a result, the triac 22 is turned on for the time (t2−t1), and the voltage of the waveform W1 is applied to the motor 14.

When the gate signal is turned off at time t2 and a zero-cross signal of, for example, four pulses is input and the count value of the zero-cross counter 41 becomes 7, the output of the gate signal is started again (t3). . When the value of the zero-cross counter 41 becomes 11, the output of the gate signal input to the triac 22 is stopped (t4). As a result, the waveform W
2 are applied.

Next, when the count value of the zero-cross counter 41 becomes 15, the output of the gate signal is started again (t5), and when the value of the zero-cross counter 41 becomes 21, the output of the gate signal is stopped (t6). As a result, the voltage of the waveform W3 is applied to the motor 14. Thereafter, a 4-pulse zero-cross signal is input to the microcomputer 26, and when the count value of the zero-cross counter 41 reaches 25 (t7), a gate signal is output until the rotation speed of the motor 14 reaches a predetermined target rotation speed. to continue.

After the rotation speed of the motor 14 reaches the target rotation speed, control for reducing the rotation speed of the motor 14 is performed for a predetermined time (for example, two seconds). In the control for reducing the rotation speed of the motor 14, the signal width of the gate signal is controlled so as to gradually decrease from the state where the gate signal is continuously output, and the rotation speed of the motor 14 gradually decreases. I do.

As described above, in the motor control according to the second embodiment, the output / stop of the gate signal is controlled in synchronization with the ON / OFF of the zero-cross signal. That is, this second
In the motor control according to the embodiment, the conduction angle of the triac 22 is not controlled. Therefore, unlike the case where the rotation speed of the motor 14 is controlled by the phase control, the motor 14 does not generate electromagnetic noise.

When increasing the rotation speed of the motor 14,
Instead of the gate signal being output continuously from the beginning,
During the period from t1 to t7, the gate signal is output intermittently, and the signal width of the gate signal is controlled so as to gradually increase.
Thereby, the electric power supplied to the motor 14 gradually increases, and the rotation speed of the motor 14 gradually increases. Therefore, the driving force of the motor 14 is gradually transmitted to the inner tub 3, so that it is possible to suppress the generation of an impact sound caused by the driving force of the motor 14 acting on the inner tub 3 abruptly.

Although the two embodiments of the present invention have been described above, the present invention is not limited to the above-described two embodiments. For example, in the above-described first embodiment, the control process for increasing or decreasing the rotation speed of the motor has been described using the specific numerical values (triac conduction angle) shown in FIG. 3 as an example. The numerical values shown are merely examples, and may be changed as appropriate. That is, one of the features of the phase control processing according to the first embodiment is that the control is performed such that the motor rotation speed is gradually decreased until a predetermined time elapses after the motor rotation speed reaches the target rotation speed. However, after the predetermined time has elapsed, the motor is controlled so as to gradually increase the rotation speed until the motor rotation speed reaches the target rotation speed. Therefore, the numerical values specifically exemplified in the above embodiment may be changed as long as this characteristic is satisfied.

In each of the above-described embodiments, when a predetermined time (for example, 2 seconds) elapses after the motor rotation speed reaches the target rotation speed, the motor rotation speed is reduced from the control for reducing the motor rotation speed. Although it is preferable to switch to control for increasing the motor speed, for example, when the motor speed decreases to a predetermined speed, the control is switched from control for decreasing the motor speed to control for increasing the motor speed. Is also good.

In each of the above embodiments, the control of the motor during the spin-drying process has been specifically described. However, the motor control device and the motor control method according to the present invention are not limited to the processes other than the spin-drying process such as the washing process and the rinsing process. The present invention may be applied to control of a motor in a washing process. Further, the case where the present invention is applied to a fully automatic washing machine has been described, but the present invention is also applicable to a so-called two-tub washing machine. Further, the present invention can be applied to any device other than the washing machine, as long as the device is provided with a motor that is supplied with power from an AC power supply and generates a driving force for rotating the rotating body. It is.

[0105]

According to the first and fifth aspects of the present invention,
It is possible to suppress the generation of an impact sound caused by the drive force of the motor suddenly acting on the rotating body. According to the second and sixth aspects of the present invention, even if a striking sound is generated due to the drive force of the motor suddenly acting on the rotating body, the striking sound is periodically generated, so that it is impractical for a person. Less likely to give a pleasant feeling.

According to the third aspect of the present invention, it is possible to suppress the generation of electromagnetic noise due to the conduction of the triac near the phase angle of 90 °. According to the fourth aspect of the present invention, it is possible to provide a washing machine that is less likely to generate a striking sound due to a sudden drive force of the motor acting on the dewatering tub and the pulsator. Further, in the case where the motor control device according to the second aspect is provided, even if a striking sound is generated, the striking sound is periodically generated, so that the user does not feel distrust of the washing machine. Can be reduced.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a simplified configuration of a fully automatic washing machine according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an electrical configuration of the fully automatic washing machine, particularly showing a portion related to motor control.

FIG. 3 is a diagram showing an example of a phase data table stored in a ROM.

FIG. 4 is a flowchart illustrating an example of a control operation executed by the microcomputer.

FIG. 5 is a flowchart illustrating a flow of control during a dehydration process.

FIG. 6 is a flowchart illustrating a flow of a rotation interruption process.

FIG. 7 is a flowchart illustrating a flow of a rotation speed process.

FIG. 8 is a flowchart illustrating a flow of a time counting process.

FIG. 9 is a flowchart illustrating a flow of a phase control process.

FIG. 10 is a flowchart illustrating a flow of a phase control process.

FIG. 11 is a flowchart illustrating a flow of a phase control process.

FIG. 12 is a diagram showing a change over time in the number of rotations of a motor.

FIG. 13 is a diagram showing current and voltage waveforms when a control process for lowering the motor rotation speed is being executed.

FIG. 14 is a diagram showing current and voltage waveforms when a control process for lowering the motor rotation speed is being executed.

FIG. 15 is a timing chart for describing control of a motor according to another embodiment of the present invention.

[Explanation of symbols]

 3 Inner Vessel 11 Pulsator 14 Motor 21 AC Power Supply 22, 23 Triac 25 Zero Cross Detection Circuit 26 Microcomputer 28 Rotation Sensor 29 ROM 30 RAM 31 Timer

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Yasushi Honda 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Hoyuki Murakami 2-chome Keihanhondori, Moriguchi-shi, Osaka No. 5-5 in Sanyo Electric Co., Ltd.

Claims (6)

[Claims] 1. An apparatus for controlling a motor that generates a driving force for rotating a rotating body, the apparatus being provided in a power supply path from an AC power supply to the motor, for adjusting power supplied to the motor. A triac element that is controlled to be turned on / off, a rotation number detection means for detecting a rotation number of the motor, and a conduction for setting a conduction angle of the triac element based on the motor rotation number detected by the rotation number detection means. An angle setting unit, and a gate signal output unit that provides a gate signal for turning on the triac element to the triac element at a timing corresponding to the conduction angle set by the conduction angle setting unit, and the conduction angle setting unit includes: For a predetermined period after the motor rotation speed reaches a preset rotation speed, the conduction angle of the triac element is gradually increased to a predetermined angle. Rotation speed reducing means for setting, and rotation speed increasing means for setting the conduction angle of the triac element to gradually decrease until the motor rotation speed reaches the preset rotation speed after the predetermined period elapses. A motor control device comprising: 2. The apparatus according to claim 1, further comprising a timer for measuring an elapsed time from a point in time when the motor rotation speed detected by the rotation speed detection means reaches the preset rotation speed, wherein the predetermined period is measured by the timer. The motor control device according to claim 1, wherein the predetermined time is a predetermined time. 3. The motor control device according to claim 1, wherein the conduction angle setting means sets the conduction angle of the triac to an angle out of a predetermined angle range including 90 °. 4. A washing tub capable of storing washing water, a pulsator rotatably disposed in the washing tub, a dehydrating tub capable of storing laundry to be dehydrated, and a pulsator and a spinning tub being rotated. A motor for driving; and motor control means for controlling rotation of the motor, wherein the motor control means comprises:
A washing machine to which the motor control device according to any one of the above is applied. 5. A method for controlling a motor for generating a driving force for rotating a rotating body, comprising: a step of detecting a number of rotations of the motor; and after the number of rotations of the motor reaches a predetermined number of rotations. Gradually lowering the motor speed during a predetermined period of time; and gradually increasing the motor speed until the motor speed reaches the preset speed again after the predetermined time has elapsed. A motor control method. 6. The method according to claim 6, further comprising the step of: starting a measurement of an elapsed time from a time point when the rotation speed of the motor reaches the preset rotation speed. 6. The motor control method according to claim 5, wherein the predetermined time is set.