JP2001009189A - Washing machine - Google Patents

Abstract

(57) [Summary] [PROBLEMS] If an abnormality occurs in a control means for driving a main motor without impairing conventional usability, power supply to only the main motor can be instantaneously cut off, and the user To provide a washing machine that can be easily recognized as abnormal. A motor switch (42) for supplying / cutting power to a main motor (7) is provided separately from a power switch (21) for supplying / cutting power to an entire control unit including a main motor control unit and a clutch switching device control unit. . The operation control unit 34 includes a forward drive triac 38 or a reverse drive triac 39 for driving the main motor 7.
If any one of them is detected as abnormal, the motor switch 42 is turned off, the power supply to the main motor 7 is cut off, the washing machine is stopped, and the stopped state is displayed on the display 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine, and more particularly to a control system for supplying power to a main motor for rotating a washing and dewatering tub.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 1-244798 discloses a method for shutting off the supply of power to a main motor when an abnormality occurs in a control means for driving a main motor of a fully automatic washing machine.
A method to prevent abnormal heating of the main motor and ensure product safety by shutting off the power to the main motor when the drive elements for the main motor forward and reverse rotation are simultaneously conducting. Is disclosed.

[0003]

However, as described in Japanese Patent Application Laid-Open No. 1-244798, the power supply to the motor is detected by detecting the case where the respective driving elements for forward / reverse rotation are simultaneously conducting. In the method of shutting off the supply of power, there is a case where an abnormality is not detected even if only one of the driving elements is insulated and short-circuited in an uncontrollable state.

For example, during the "dehydration" step, the main motor rotates only in one direction (positive rotation). At this time, the driving element for the positive rotation is broken and an uncontrollable short-circuit state occurs. Even so, the drive element for reverse rotation is not conducted, so that no abnormality is detected, and abnormal rotation continues at high speed, increasing the danger of user's convenience and causing damage to the laundry.

SUMMARY OF THE INVENTION It is an object of the present invention to supply power to only the main motor instantaneously when the control means for driving the main motor fails, without impairing the conventional usability. Is to provide a washing machine that can be easily recognized as abnormal.

[0006]

In order to achieve the above object, a feature of a washing machine according to the present invention is that a motor switch mechanism for turning on / off a power supply to a motor of the washing machine is provided with a control means as a whole. The operation control unit, which is provided separately from the overall switch mechanism for turning on / off the power supply to the washing machine and controls the operation of the washing machine, is configured such that one of the forward drive element and the reverse drive element that drives the electric motor is abnormal. Is detected, the electric motor switch mechanism is turned off to cut off the power supply to the electric motor.

More specifically, the present invention provides the following washing machines.

The present invention provides a washing machine having an outer frame, an outer tub suspended from and supported by four upper corners of the outer frame, and a rotatable wing provided at the center bottom and rotatable in the outer tub. A dewatering tub, a forward / reversely rotatable motor for rotating the rotor and the washing and dewatering tub, a motor control means for controlling a rotating operation including a rotation direction of the motor, a rotating blade rotation and a washing and dewatering tub rotation A switching device that switches between a switching device, a switching device control unit that controls a switching operation of the switching device, and a washing machine that includes an operation control unit that controls operation including activation of the motor control unit and the switching device control unit.
A motor switch mechanism for turning on / off the power supply to the motor is provided separately from an entire switch mechanism for turning on / off the power supply to the entire control means including the motor control means and the switching device control means. When one of the forward drive element and the reverse drive element that drives the motor is detected as abnormal, the control unit turns off the motor switch mechanism and cuts off power supply to the motor. A washing machine characterized by the following.

Further, the present invention provides an outer frame having a lid into which laundry is put, an outer tub suspended from four upper corners of the outer frame, and a central bottom portion rotatably provided in the outer tub. A washing and dewatering tub having rotatable rotating blades, a forward and reverse rotatable motor for rotating the rotating wing and the washing and dewatering tub, and a motor control means for controlling a rotating operation including a rotating direction of the motor. A switching device for switching between the rotation of the rotating blades and the rotation of the washing / dewatering tub, a switching device control unit for controlling a switching operation of the switching device, and an operation including activation of the motor control unit and the switching device control unit. In a washing machine having an operation control unit and a storage device for storing the operation state, a motor switch mechanism for turning on / off a power supply to the electric motor is provided by the electric motor control unit and the switching device control unit. Provided separately from the overall switch mechanism for turning on / off the power supply to the entire control means including the means, the operation control unit includes a drive element for driving the electric motor, either a forward drive element or a reverse drive element. When an abnormality is detected, the electric motor switch mechanism is turned off to cut off the power supply to the electric motor, and the stopped state of the washing machine at the time of the cutoff is stored in the storage device. Provided is a washing machine characterized by notification.

[0010] Preferably, the motor is a single-phase induction motor having a main coil and an auxiliary coil, and the motor switch mechanism simultaneously turns off power supply to the main coil and the auxiliary coil.

Preferably, the operation control unit releases the shut-off state of the electric motor switch mechanism and restarts power supply to the electric motor by re-operation of the washing machine, and is stored in the storage device. The process is restarted from the washing process after the process in the stopped state.

Preferably, when the lid is closed, the operation control section restarts the washing process after the process in the stopped state.

Preferably, the operation control section turns off the overall switch mechanism and shuts off the control when there is no re-operation of the washing machine within a set time after the power supply to the electric motor is cut off. Shut off power to the entire means.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a washing machine according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 4 is a schematic view of a fully automatic washing machine according to one embodiment of the present invention, and FIG. 5 is a longitudinal sectional view of the fully automatic washing machine of FIG. A fully automatic washing machine includes a suspension rod 2 and a vibration isolator 3 made of a coil spring or elastic rubber in an outer frame 1 made of steel plate.
Thus, the outer tank 4 made of synthetic resin is suspended. The outer tub 4 is suspended and supported from the upper four corners of the outer frame 1 by four sets of hanging rods and a vibration isolator. A stainless steel washing and dewatering tub 5 is rotatably provided in the outer tub 4 for storing water to be washed.

The washing and dewatering tub 5 is provided with a large number of dewatering holes 5a, and a rotary blade 6 is rotatably provided at the center bottom. During the washing and rinsing steps, the washing and dewatering tub 5 is stopped, and the rotary wing 6 is rotated clockwise (forward) and counterclockwise (reverse). During the spin-drying step, the washing and spin-drying tub 5 is rotated in one direction. The rotation of the rotating blades 6 and the washing and dewatering tub 5 is performed by a driving device.

The driving device is a main motor 7 which is an electric motor.
And a pulley 8a and a belt 8b for transmitting the rotation of the main motor 7 to the rotary blade 6 or the washing and dewatering tub 5.
And a clutch device 9 for rotating only the rotor 6 during the washing and rinsing steps, or rotating the washing and dewatering tub (hereinafter referred to as a washing tub) 5 during the dewatering step. It comprises a clutch solenoid 9a for switching.

These driving devices are fixed to the bottom surface of the outer tub 4 using a support plate 10 made of steel plate. The outer tub 4 is provided with a water level sensor tube 12 for transmitting water pressure in the outer tub to a water level sensor 11 and a drainage device 13 for draining washing water in the outer tub 4.

A drain valve 13a is provided in the drain unit 13 in the outer tank 4.
The outlet provided at the bottom immediately after the drain hole 14 is the drain device 13.
Open inside. An abnormal overflow pipe 15 having an open upper end is provided on the side surface of the outer tub 4.
Open in 3.

The abnormal overflow pipe 15 is provided in case of an abnormality in the water supply and the washing water overflows from the outer tub 4 or when the washing water jumps out of the outer tub due to the movement of the laundry during washing. The overflowing washing water is abnormal overflow pipe 1
5 flows into the drainage device 13 and is discharged out of the washing machine by the drainage hose 16.

In the upper part of the outer frame 1, an inlet 17a for charging laundry, a water faucet, a rear storage box 17 for storing a water supply valve and the like are provided.
b and a front cover 17 formed with a front operation box 17c for storing electrical components such as a microcomputer. A lid 18 made of synthetic resin is provided at the inlet 17a. Further, a lid switch 18a is provided in the top cover 17, and the lid 18 is forcibly connected to cut off the power supply to the clutch solenoid 9a when the lid 18 is opened. , Rotating washing tub 5
Can be stopped instantaneously.

An operation panel 19 is mounted on the upper surface of the front operation box 17c, and a controller 20 having a built-in microcomputer as a control unit is provided below the operation panel. In the front operation box 17c, there is provided a water level sensor 11 for detecting whether or not water has accumulated to a specified water level by detecting the water pressure in the outer tub 4.

The operation panel 19 includes a power switch 21, various indicators 22, various operation buttons 23, and the like. The user operates the washing machine with the operation buttons 23 and displays the operation state. Vessel 22 and controller 2
0 can be confirmed by a built-in buzzer or the like. Further, even when an abnormality occurs, it is possible to grasp the details of the abnormality that has occurred by checking the display 22 and the buzzer.

The rear storage box 17b is provided with a water tap 24 to which a hose from a water tap or the like is connected, through which washing water is supplied to the washing tub 5.

Next, FIG. 1 shows a circuit configuration of a control circuit of the fully automatic washing machine of FIG. By turning on / off the power switch 21, the power of the entire control circuit is supplied or cut off from the power obtained from the household AC power supply 30. Normally, it can be turned on and off arbitrarily by a user's operation. However, a power switch driving triac 35 is connected to the power switch 21 and an output signal from the operation control unit 34 outputs a signal to the entire control circuit at the end of the process or when an abnormality occurs It is possible to automatically shut off the supplied power.

A primary side of a power transformer 31 is connected to an AC power supply via the power switch 21, and a rectifying / smoothing circuit 32 is connected to a secondary side of the power transformer 31, and a constant voltage obtained by a constant voltage circuit 33. The voltage is used as a driving power source of the operation control unit 34 connected thereto. Furthermore,
The AC power supply via the power switch 21 is used as a power supply for each load.

The clutch solenoid 9a for switching the clutch device 9 for rotating only the rotor 6 during the washing and rinsing steps or for rotating the washing tub 5 during the spin-drying step is provided with a clutch solenoid 9 connected thereto. Operation control unit 34 via driving triac 36
Is controlled by an output signal from the power supply, but power is supplied via a lid switch 18a which is turned off when the lid 18 is open and turned on when the lid 18 is closed. Therefore, when the lid 18 is opened during the spin-drying process, the power supply to the clutch solenoid 9a is forcibly cut off regardless of the output signal from the operation control unit 34, and the rotating washing tub 5 is instantly stopped. Can be done.

The open / close state of the lid 18, that is, the lid switch 18
The information about the on / off state of “a” is transmitted to the operation control unit 34 through the lid state detection unit 37.

A main motor 7 constituted by a single-phase induction motor has a main coil 7a and an auxiliary coil 7b,
In the washing and rinsing steps, the power supply to the clutch solenoid 9a is cut off to keep the washing tub 5 stationary, and when the rotating blades 6 are rotated clockwise (positively), power is supplied to the main coil 7a and counterclockwise (reverse). To rotate the auxiliary coil 7b.

During the spin-drying step, the washing tub 5 is turned clockwise (positively).
In this case, the rotation of the main motor 7 is transmitted to the washing tub 5 by energizing the main coil 7a and energizing the clutch solenoid 9a. The drive of the main motor 7 is also performed by the operation control unit 34 via the triac 38 for forward drive and the triac 39 for reverse drive.
Controlled by the output signal from

The rotation state of the main motor 7 is determined by detecting the terminal voltage output from the motor capacitor 40 by the rotation detection unit 41.
The rotation state of the main motor 7 is grasped by transmitting a signal obtained by the detection to the operation control unit 34.

The main motor 7 is also energized by a motor switch 42 provided on a common line between the main coil 7a and the auxiliary coil 7b. Thus, regardless of the direction in which the main motor 7 is rotating, the on / off state of the motor switch 42 is controlled by the output signal from the operation control unit 34 through the motor switch driving unit 43. This makes it possible to forcibly shut off the power supply of only the main motor 7 independently of the control by the forward drive triac 38 and the reverse drive triac 39.

The operation control unit 34 includes a microcomputer, and includes a switch for selecting a washing process,
An input signal from the user is given by various operation buttons 23 composed of a switch for starting driving and the like. Further, a detection signal from the water level sensor 11 or the like is input to the operation control unit 34.

In accordance with these input signals, the operation control unit 34
In order to execute an appropriate operation program according to the amount of cloth and the quality of the cloth put into the washing tub based on data and the like stored in advance in the microcomputer in And the driving of each load. These operating states are indicated by LE
The information is displayed on the display 22 constituted by D or the like, and sometimes a notification sound is emitted by a buzzer 44 to make it easy for the user to understand.

The storage device 45 is constituted by a non-volatile storage element whose stored contents are not erased even after the power is cut off, so that information can be written and read as necessary by an input / output signal with the operation control unit 34. It is possible.

Therefore, the forward drive triac 3
8 or at least one of the reverse drive triacs 39 is short-circuited due to insulation breakdown, and when the terminal voltage output from the motor capacitor 40 is detected by the rotation detector 41 as abnormal rotation of the main motor 7,
First, the motor switch 42 is turned off to cut off the power supply to the main motor 7 to ensure the safety for the user. Next, the state at that time is determined by an input / output signal from the operation control unit 34 in the nonvolatile storage device 45. Is displayed on the display 22 or a buzzer 44 sounds a notification sound in order to notify the user of the occurrence of the abnormal state.

Thereafter, if the operation is not performed for a certain period of time, the power switch driving triac 35 is driven by the output signal from the operation control unit 34 to turn off the power switch 21 and the power supplied to the entire control circuit. Automatically shut off.

Since power is supplied to the entire control circuit except for the main motor even after the forced stop, when the user who notices that the power has been cut off during the washing process turns on the power again, First, since the information at the time of occurrence of the abnormality written in the storage device 45 is read out again by the operation control unit 34, it is possible to maintain the state where the motor switch 42 is turned off, so that the main motor 7 may suddenly start rotating. Absent. Thus, the user can easily confirm that the process has been interrupted.

Further, the user is alerted to the fact that the power has been shut down due to the occurrence of an abnormal condition by the display 22 and the buzzer 44.

Even when the power supply is shut down due to erroneous detection by the rotation detecting unit 41 during normal operation, the storage device 45 is required to restart the washing process.
By reading out the information written in, the operation can be restarted from the point of stop, so that it is possible to eliminate the waste caused by performing the setting again with the operation button 23 or repeating the already-completed intermediate process. It is possible to further improve the usability for the user.

According to the circuit configuration shown in the present embodiment as described above, even if the main motor driving triacs 38 and 39 become abnormal, the power supply of the main motor 7 is maintained without impairing the conventional usability. Supply can be instantaneously interrupted, safety can be ensured, and the user can easily confirm it by the notification sound of the display 22 or the buzzer 44, and the rotating blade 6 repeats abnormal rotation. Since the damage to the cloth can be reduced, a more secure and reliable washing machine can be provided.

According to the circuit configuration shown in this embodiment,
If the main motor is in a normal state, it is possible to operate the main motor irrespective of the opening and closing of the lid during a process that does not involve the operation of a clutch that rotates only the rotor blades. Therefore, when sensing the normal amount of cloth or "washing"
The operation such as time is performed even when the lid is open, so the user puts the laundry after opening the lid, and does not close the lid until the detergent is input through the cloth amount sensing operation. Without compromising the traditional usability of
A safer and more reliable washing machine can be provided.

FIG. 2 shows a flowchart of the processing operation when a rotation abnormality occurs, which is performed by the circuit configuration shown in FIG. First, after starting a series of washing steps, it is assumed that an abnormality occurs in the rotation of the main motor 7 during the steps, and this is defined as step S1. In the next step S2, the signal obtained by the rotation detection unit 41 is transmitted to the operation control unit 34,
As soon as it is determined that an abnormality has occurred, in step S3, the motor switch
Is turned off, and the rotation of the main motor 7 is forcibly stopped in step S4.

The rotation abnormality that has occurred at this time is determined by the triac 38 for forward drive or the triac 39 for reverse drive.
In the case where a short circuit occurs due to the insulation breakdown of the main motor 7 and the motor cannot be controlled, by providing the motor switch 42 on the common line of the main coil 7a and the auxiliary coil 7b, Only the power supply can be turned off.

Further, since power is still supplied to the entire control circuit except for the main motor 7, it is possible to write data into the storage device 45 constituted by nonvolatile storage elements, and the process is performed in the middle of the process. After the state at this time is stored in the storage device 45 in step S5, in step S6, the abnormality notification by the buzzer 44 or the display 2 is performed so that the user can recognize that the process has been interrupted.
2 and stand by in a suspended state.

In the next step S7, the open / closed state of the lid 18 at this time is transmitted to the operation control section 34 by the lid switch 18a and the lid state detecting section 37, and on condition that the lid 18 is closed. In the next step S8, restart from the stop state is enabled by the operation of the user.

This is intended to eliminate the danger of re-occurrence of abnormal rotation. When the user turns on the power again after the power to the main motor 7 is forcibly shut off. Even if you suddenly start abnormal rotation,
If the lid 18 is always closed, the washing tub will not be inadvertently touched, which is a great effect for improving safety.

Therefore, if the restart operation is not performed even if the cover 18 is in the open state or the cover 18 is in the closed state, in step S12, the elapsed time from the temporary stop is determined. If t seconds or more have elapsed as a certain period of time, in the next step S13, the power switch 2 is turned on via the power switch driving triac 35 in response to an output instruction from the operation control unit 34.
1 is turned off and the process ends.

As described above, if the power supply is automatically turned off due to the occurrence of a rotation abnormality of the main motor 7, the user who notices that the operation is interrupted in the middle of the washing process is suspicious. There is a high possibility that the power will be turned on again. Therefore, if it is assumed that the power is turned on again by the user in step S14 after the power is automatically turned off, the process returns to step S6, and the abnormal rotation of the main motor 7 is indicated by the display on the display 22 and the notification sound by the buzzer 44. By notifying the user that the process has been suspended due to the occurrence of
The content of the abnormality that has occurred can be confirmed, and attention can be given to restarting the washing process.

Even if the lid is opened in step S7, the lid 18 is closed by the user before elapse of at least t seconds from the time when the lid is temporarily stopped, and even if the restart operation is performed, the main motor is initially closed. The rotation state of 7 is checked, and safety is checked before restarting.

First, in step S 9, the motor switch 42 is turned on through the motor switch driving unit 43 in accordance with a command from the operation control unit 34. At this time, if the rotation abnormality occurs again, the process returns to step S2 without restarting, and after the abnormality is detected again based on the signal obtained from the rotation detection unit 41, the process proceeds from step S3 onward in the same manner as described above. Will do.

However, if the generated rotation abnormality is temporary due to malfunction such as noise, it is determined that the rotation is normal in step S10 based on the signal obtained from the rotation detection unit 41, and in the next step S11 Then, the contents stored in the storage device 45 in step S5 are read out, and the state at the time of the temporary stop during the washing process is reproduced. From there, the program automatically returns to the original main program, and performs the process from the point at which it was temporarily stopped.

In this way, by automatically reproducing the state at the time of the temporary stop and automatically restarting from that point, the setting can be performed again, or the already-completed intermediate process can be repeated. Although it is possible to eliminate waste due to the above, step S6 is performed according to the user's request.
It is also possible for the user to freely set by the operation button 23 in the temporary stop state in, and by restarting from the set state in step S11, there is an effect of improving usability.

In the above embodiment, the motor switch 42 is provided on the common line between the main coil 7a and the auxiliary coil 7b, but this is applicable when the main motor 7 is rotating in any direction. It is also possible to shut off only the power to the main motor 7 as necessary.

FIG. 3 shows another example of the circuit configuration of the control circuit of FIG. As shown in FIG. 3, the motor switch 42 is
Even if the main motor 7 is connected between the forward drive triac 38 and the reverse drive triac 39, the same effect as described above can be obtained as long as the two wires can be simultaneously cut off.

As long as it has a function as a switch, what is used as a motor switch may be, for example, a contact relay or a semiconductor element, or a switch using an optical element in consideration of electrical insulation. good.

Further, when an abnormality such as continuous energization occurs other than in the main motor 7, there is a risk that the user may easily touch the washing machine, or the put laundry may be damaged. The same effect can be obtained by providing the same switch mechanism according to the present invention for a certain load.

[0058]

According to the present invention, when an abnormality occurs in the control means for driving the main motor during a series of washing steps, a motor switch provided on a common line between the main coil and the auxiliary coil of the main motor is used. Since it is possible to instantly shut off only the power to the main motor and forcibly stop it, eliminate the danger of user convenience, reduce fabric damage due to abnormal rotation, and improve safety and reliability. Can be.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of a control circuit of a fully automatic washing machine according to one embodiment of the present invention.

FIG. 2 is a flowchart of a processing operation performed when a rotation abnormality occurs, which is performed by the circuit configuration shown in FIG. 1;

FIG. 3 is a diagram illustrating another example of the circuit configuration of the control circuit of FIG. 1;

FIG. 4 is a schematic view of a fully automatic washing machine according to one embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of the fully automatic washing machine of FIG.

[Explanation of symbols]

5 ... Washing and dewatering tub, 6 ... Rotary wing, 7 ... Main motor, 7
a: main coil, 7b: auxiliary coil, 9: clutch device,
9a: clutch solenoid, 11: water level sensor, 18:
Lid, 18a lid switch, 21 power switch, 22
Indicator 23, operation buttons 30, AC power supply 34, operation control unit 38, forward drive triac 39, reverse drive triac 41, rotation detection unit 42, motor switch 43, motor switch Drive unit, 44 buzzer, 45 storage device

Claims (6)

[Claims] 1. A washing and dewatering tub having an outer frame, an outer tub suspended from upper four corners of the outer frame, and a rotatable wing provided at a central bottom portion rotatably provided in the outer tub. A motor capable of rotating the rotor and the washing and dewatering tub forward and backward, a motor control means for controlling a rotation operation including a rotation direction of the motor, a rotating wing rotation and a washing and dewatering tub rotation. A washing machine comprising: a switching device for switching; a switching device control unit for controlling a switching operation of the switching device; and an operation control unit for controlling an operation including activation of the motor control unit and the switching device control unit. The motor switch mechanism for turning on / off the power supply to the motor is provided separately from the overall switch mechanism for turning on / off the power supply to the entire control means including the motor control means and the switching device control means. When one of the forward drive element and the reverse drive element for driving the motor is detected as abnormal, the operation control unit turns off the motor switch mechanism to supply power to the motor. A washing machine characterized in that it shuts off. 2. An outer frame having a lid into which laundry is put, an outer tub suspended from and supported by four upper corners of the outer frame, and a rotatable rotatably provided in the outer tub and rotatable at a central bottom portion. A washing and dewatering tub having rotating blades, a forward and reverse rotatable motor for rotating the rotating wing and the washing and dewatering tub, and a motor control means for controlling a rotating operation including a rotating direction of the motor;
A switching device for switching between the rotation of the rotating blades and the rotation of the washing and dewatering tub, a switching device control unit for controlling a switching operation of the switching device, and an operation for controlling an operation including activation of the motor control unit and the switching device control unit In a washing machine having a control unit and a storage device for storing the operation state, a control unit including an electric motor switch mechanism for turning on / off a power supply to the electric motor, the electric motor control unit and the switching device control unit Provided separately from the entire switch mechanism for turning on / off the power supply to the whole, the operation control unit detects that one of the forward drive element and the reverse drive element that drives the motor is abnormal. When the electric motor switch mechanism is turned off, the power supply to the electric motor is shut off, and the stopped state of the washing machine when the electric power is cut off is stored in the storage device. The washing machine notifies the stop state after storing in the washing machine. 3. The motor according to claim 1, wherein the motor is a single-phase induction motor having a main coil and an auxiliary coil, and the motor switch mechanism supplies power to the main coil and the auxiliary coil. A washing machine that is turned off at the same time. 4. The operation control section according to claim 2, wherein the operation control section releases the cutoff state of the electric motor switch mechanism and restarts power supply to the electric motor by re-operation of the washing machine,
The washing machine is restarted from a washing step after the step in the stopped state stored in the storage device. 5. The washing machine according to claim 4, wherein the operation control section restarts from a washing step after the step in the stopped state when the lid is closed. 6. The system according to claim 2, wherein the operation control section turns off the overall switch mechanism when a re-operation of the washing machine is not performed within a set time after power supply to the electric motor is cut off. The power supply to the entire control means is shut off.