JP2003326086A - Washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stop a motor driving when an AC power source stops or a voltage drops during a dehydrating operation or a dehydration braking, to surely stop a washing-cum-dehydrating tub by a simple and inexpensive constitution after the restoration of the AC power source, and to increase safety in a washing machine which drives the motor by an inverter circuit. <P>SOLUTION: A DC power source is constituted by connecting a rectification circuit 3 with the AC power source 1, and the motor 6 is driven by inverting DC power into AC power by the inverter circuit 5. A voltage state of the AC power source 1 is detected by power source voltage-detecting means 4 and 15, and the inverter circuit 5 is controlled by a controlling means 10. The controlling means 10 stops the driving of the motor 6 when the power source voltage- detecting means 4 and 15 detect the voltage decrease or the voltage stop of the AC power source 1 when the motor 6 is driven. Then, the rotation of the motor 6 is stopped by short-circuit braking when the returning to the normal voltage state of the AC power source 1 is detected. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor drive device for a washing machine in which a motor is driven by an inverter circuit.

[0002]

2. Description of the Related Art In recent years, there has been proposed a motor of a washing machine driven by an inverter circuit to improve motor performance, and a motor for braking is driven by the inverter circuit.

Conventionally, this type of washing machine is disclosed in Japanese Patent Laid-Open No. 11-2.
It had a configuration as shown in Japanese Patent No. 75889. That is, the brushless motor drives the stirring blade at the bottom of the washing tub or the washing / dehydrating tub, and the motor position detecting means detects the rotor position to control the voltage applied to the motor and the phase command to apply the dewatering brake. I was trying to control it.

Further, in this type of washing machine, even if a momentary power failure occurs, the control circuit is kept operating by the electric power stored by the capacitor in the control circuit.
In addition, in order to lengthen the supply time of this electric power, during this period, driving of a load such as a motor is stopped so as to suppress a rapid decrease in power consumption.

[0005]

However, in such a conventional structure, a momentary power failure or the like occurs during the dehydration operation or during the dehydration brake, and then the power failure or the like is eliminated, and the dehydration operation or the dehydration operation is performed. When attempting to restart the brake, the problem is that the dehydration operation or the dehydration brake operation cannot be performed correctly due to reasons such as it is difficult to detect the motor position correctly because the motor drive was once stopped. As a result, there is a problem that an unsafe state occurs due to the inability to stop the washing / dehydrating tub properly, and a problem with respect to the basic performance of the washing machine that the dehydrating performance decreases.

The present invention solves the above conventional problems.
Even if the AC power supply stops due to a power failure during the dehydration operation or the dehydration brake, the power consumption is reduced by stopping the motor drive during the stop, and the operation of the control circuit stops due to a momentary power failure. By avoiding this, and by performing a short-circuit brake that can brake regardless of the rotor position after the power failure is restored, the washing and dehydrating tub can be reliably stopped with a simple and inexpensive structure, improving safety. The first purpose is to propose a washing machine.

Even when the dehydration operation is stopped due to a momentary power failure or the like, particularly during the dehydration operation, the dehydration operation can be carried out again to avoid the deterioration of the dehydration performance, thereby improving the basic performance. The second purpose is to propose a washing machine that does.

Further, a washing machine is proposed in which, even when the dehydration brake is stopped due to a momentary power failure or the like, particularly during the dehydration brake, the laundry operation is performed to the end and the laundry operation is terminated at a predetermined time. This is the third purpose.

[0009]

In order to achieve the first object, a washing machine of the present invention includes a rectifier circuit which is connected to an AC power source and converts the AC power into DC power, and the rectifier circuit. An inverter circuit for converting the supplied DC power into AC power, a motor driven by the inverter circuit, a rotor position detecting means for detecting a rotor position of the motor, and a power supply voltage detecting means for detecting a voltage state of an AC power supply. And a control means for controlling the inverter circuit, wherein the control means detects the voltage drop of the AC power supply or the stop of the AC power supply while the motor is driving. , When the driving of the motor is stopped, and then the power supply voltage detection means detects again that the AC power supply has returned to a normal voltage state, the rotation of the motor is short-circuited. In which it was to stop by the rake.

As a result, even if a momentary power failure or the like occurs while the motor is being driven, and then the power failure or the like is resolved,
The motor can be reliably stopped with a simple and inexpensive structure to improve safety.

Further, in order to achieve the second object,
In the washing machine of the present invention, when a momentary power failure or the like occurs during the dehydration operation and then the power failure or the like is resolved, the rotation of the washing and dehydration tank is stopped by the short-circuit brake, and then the dehydration operation is performed again. It is the one.

This causes a momentary power failure,
Even if the power failure or the like is resolved thereafter, it is possible to avoid the deterioration of the dehydration performance and maintain the basic performance.

Further, in order to achieve the third object,
The washing machine of the present invention, during the dehydration brake, when a momentary power failure or the like occurs, and then the power failure or the like is resolved, after stopping the rotation of the washing and dehydrating tub by the short-circuit brake, continuously,
The next process is continued.

As a result, a momentary power failure or the like occurs,
After that, even if the power outage is resolved, the washing operation is performed to the end and the wasteful operation is not repeated.
The washing operation can be completed within a predetermined time without increasing the operation time.

[0015]

A first aspect of the present invention is a rectifier circuit connected to an AC power source for converting the AC power into DC power, and an inverter circuit for converting the DC power converted by the rectifier circuit into AC power. A motor driven by the inverter circuit, rotor position detection means for detecting the rotor position of the motor, power supply voltage detection means for detecting the voltage state of the AC power supply, and control means for controlling the inverter circuit. The control means, when the power supply voltage detection means detects a voltage drop of the AC power supply or a stop of the AC power supply while the motor is being driven, stops the driving of the motor, and thereafter, A washing machine in which the rotation of the motor is stopped by a short-circuit brake when the power supply voltage detecting means detects again that the AC power supply has returned to a normal voltage state. By doing so, even if a momentary power failure occurs while the motor is driving, and then the power failure is resolved, the motor being driven is stopped with a simple and inexpensive configuration. be able to.

According to a second aspect of the present invention, a rectifier circuit connected to an AC power source for converting the AC power into DC power, an inverter circuit for converting the DC power converted by the rectifier circuit into AC power, and the inverter. A motor driven by a circuit, a rotor position detecting means for detecting a rotor position of the motor, a power supply voltage detecting means for detecting a voltage state of an AC power supply, and a control means for controlling the inverter circuit. Means, during the braking operation of the motor, when the power supply voltage detection means detects the voltage drop of the AC power supply or the stop of the AC power supply, the braking operation of the motor is stopped, and then the power supply voltage detection means, A washing machine in which the rotation of the motor is stopped by a short-circuit brake when it is detected that the AC power supply has returned to a normal voltage state again More, during braking operation of the motor, and momentary power failure or the like occurs, then even if the power failure has been eliminated, it is possible to stop the motor during a braking operation in a simple and inexpensive construction.

According to a third aspect of the present invention, in particular, in the washing machine according to the first aspect, a washing and dehydrating tub which is rotatably provided in the outer tub and is driven by a motor is driven by the motor. In the middle of being, during the spin-drying operation of rotating the washing and spin-drying tub by the motor, during the spin-drying operation, a momentary power failure or the like occurs, and even after the power failure or the like is resolved, The rotation of the washing and dewatering tub during the dewatering operation can be stopped with a simple and inexpensive structure.

According to a fourth aspect of the present invention, in particular, in the washing machine according to the third aspect, the control means is a washing machine in which the rotation of the washing / dehydrating tub is stopped and the dehydration operation is performed again. By doing so, it is possible to provide a washing machine that secures a dehydration time even when a momentary power failure or the like occurs during the dehydration operation and then the power failure or the like is resolved.

According to a fifth aspect of the present invention, in particular, in the washing machine according to the second aspect, a washing and dehydrating tub which is rotatably provided in the outer tub and is driven by a motor is provided, and the braking operation of the motor is performed. Medium means that during the dehydration brake for stopping the rotation of the washing and dehydration tub by the motor, during the dehydration brake, a momentary power failure or the like occurs, and even after the power failure is resolved, It is possible to stop the rotation of the washing and dewatering tub during the dewatering brake with a simple and inexpensive structure.

According to a sixth aspect of the present invention, in particular, in the washing machine according to the fifth aspect, the control means stops the rotation of the washing / dehydrating tub and then continues the next step. After stopping the rotation of the washing and dewatering tub, by using a washing machine that continues the washing operation, even if a sudden accident such as a power outage occurs,
It is possible to provide a washing machine that can perform a washing operation until the end, does not repeatedly perform an unnecessary operation, and can end the washing operation at a predetermined time without increasing the operation time.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a block circuit diagram of a washing machine in a first embodiment of the present invention, FIG. 2 is a sectional view of the washing machine, and FIG. 3 is an inverter circuit of the washing machine. 2 is a circuit diagram of FIG.

In FIG. 1, an AC power supply 1 applies AC power to a rectifier circuit 3 via a line filter 2 and is converted into DC power by the rectifier circuit 3. The rectifier circuit 3 constitutes a voltage doubler rectifier circuit, and when the AC power source 1 has a positive voltage,
The capacitor 3b is charged by the full-wave rectifier diode 3a, and when the AC power supply 1 has a negative voltage, the capacitor 3c is charged, whereby the capacitors 3b, 3 connected in series are connected.
A double voltage DC voltage is generated at both ends of c.

The DC voltage detecting means 4 outputs a value divided by a resistor and detects the DC voltage across the capacitors 3b and 3c. The DC voltage detected here is the AC power supply 1
Since it is a voltage value obtained by rectifying the double voltage, it is possible to easily calculate the voltage value of the AC power supply 1 by detecting the DC voltage value.

The double voltage DC voltage generated across the capacitors 3b and 3c is applied to the inverter circuit 5.

The inverter circuit 5 is composed of a three-phase full-bridge inverter circuit composed of six power switching semiconductors and an antiparallel diode. Usually, a power transistor (similar to an IGBT), an antiparallel diode, a drive circuit thereof and a protection circuit. It is composed of an intelligent power module (hereinafter referred to as IPM) with built-in.
A motor 6 is connected to the output terminal of the inverter circuit 5.

The motor 6 is composed of a DC brushless motor, and as shown in FIG. 2, the rotor position detecting means 7 detects the relative position (rotor position) between the permanent magnet 61 and the stator 62 which form the rotor 60. To do. The rotor position detecting means 7 is usually three Hall ICs (7a, 7b, 7c)
The position is detected every 60 degrees of electrical angle.

The control circuit 8 controls the inverter circuit 5 and the switching means 9. The control circuit 10 controls the IPM of the inverter circuit 5 by the output signal of the control means 10 and the motor 6 by the control means 10 composed of a microcomputer.
Inverter drive circuit 11 for controlling the rotational drive of the switching means and switching means drive circuit 1 for controlling the switching means 9.
2, a current detection circuit 14 for detecting the current of the inverter circuit 5 by the output signal of the current detection means 13 and applying a signal according to the motor current to the control means 10, and a signal according to the presence or absence of the AC power supply 1 for the control means 10. And a power supply voltage detection circuit 15 for outputting Further, the control circuit 8 controls the switching means 9 by the switching means drive circuit 12 to control the operations of the water supply valve 16, the drain valve 17, the clutch 18, the lid lock device 19 and the like, and a series of washing, rinsing and dehydration. Control the process.

Although not shown in detail in FIG. 1, the control circuit 8 operates based on the electric power stored in the capacitors 3b and 3c. Even if the power of the AC power supply 1 is temporarily stopped, the power stored in the capacitors 3b and 3c does not drop sharply unless the motor 6 is driven by the inverter circuit 5. That is, even if the power from the AC power supply 1 is stopped for a predetermined time (for example, about 3 seconds) due to a power failure or the like, the control circuit 8 can continue to operate by the power stored in the capacitors 3b and 3c.

In FIG. 2, a water supply valve 16 supplies tap water into a water receiving tank 21 provided outside the washing / dehydrating tank 20. The lid lock device 19 is a washing / dehydrating tank 20.
The opening and closing of the lid 22 that covers the clothes inlet of the item is prohibited during the dehydration operation, and is composed of a solenoid and a lever. The drain valve 17 drains the wash water in the water receiving tub 21.

The clutch 18 is a motor shaft 63 of the motor 6.
Is connected to a drive shaft 24 of a stirring blade 25 rotatably provided on the inner bottom of the washing / dehydrating tub 20 via a reduction mechanism 23, or directly connected to a drive shaft 26 of the washing / dehydrating tub 20. The motor 6 drives the washing / dehydrating tub 20 or the stirring blades 25 by switching between these. The water receiving tank 21 is elastically suspended on an outer frame 28 via a suspension 27.

The switching means 9 is connected between the lines L1 and L2 of the AC power source 1 to control the applied voltage.
It consists of a relay or a bidirectional thyristor,
The water supply valve 16, the drain valve 17, the clutch 18, and the lid lock device 19 are respectively controlled.

The inverter circuit 5 is constructed as shown in FIG. 3 and comprises a U-phase switching unit 50A, a V-phase switching unit 50B and a W-phase switching unit 50C.

The U-phase switching unit 50A includes an upper arm transistor 51a and a lower arm transistor 51.
a pair of transistors (IGBTs) composed of a'and anti-parallel diodes 5 connected in anti-parallel to the respective IGBTs
2a, 52a ', an upper arm drive circuit 53a for driving the upper arm transistor 51a, and a lower arm transistor 5
1a ′ is driven by a lower arm drive circuit 53a ′, a current limiting resistor 54a, a bootstrap diode 55a and a bootstrap capacitor 56a, and a lower arm drive circuit capacitor 57a. Since the V-phase switching unit 50B and the W-phase switching unit 50C have the same configuration, the description thereof will be omitted.

The input signal of the upper arm drive circuit 53a is U
p, the input signal of the lower arm drive circuit 53a 'is Un, B3
Is an upper arm drive circuit 53a and a lower arm drive circuit 53a '
Is usually connected to a 15V power source. When a drive signal is applied to the lower arm drive circuit 53a ', the lower arm transistor 51a' becomes conductive, and the bootstrap capacitor 56a is charged by the power supply B3 via the current limiting resistor 54a and the bootstrap diode 55a. Therefore, before driving the upper arm transistor 51a, the inverter circuit 5 is operated and the motor 6 is driven after the bootstrap operation of driving the lower arm transistor 51a 'and charging the bootstrap capacitor 56a.

When the inverter circuit 5 is stopped, the bootstrap capacitor 56a is not charged and the upper arm drive circuit 53a cannot operate. Therefore, the upper arm transistor 51a does not conduct. Usually, the upper arm drive circuit 53a has a built-in power supply voltage drop detection circuit, which prevents the IGBT from conducting when the bootstrap voltage is equal to or lower than a predetermined value.

FIG. 4 is a waveform diagram of each part when the motor of the washing machine is driven according to the first embodiment of the present invention.
The waveform relation of each part of sine wave drive by M control is shown. Output signals H1, H2, H3 of the rotor position detecting means 7
The edge signal of 1 changes every 60 degrees, and the angle obtained by dividing 360 degrees into 6 can be discriminated from each state signal. A high edge where the signal H1 changes from low to high is shown as a reference electrical angle of 0 degree, and the U-phase winding induced voltage Ec of the motor 6 is equal to the reference signal H.
The waveform is delayed by 1 to 30 degrees. Maximum efficiency is obtained when the phases of the U-phase motor current Iu and the motor-induced voltage Ec are the same.

In FIG. 4, the U-phase motor current Iu is U
The motor applied voltage Vu has a waveform slightly advanced from the phase winding induction voltage Ec and advanced from the U phase winding induction voltage Ec by 30 degrees.

Vc is a sawtooth-shaped carrier signal generated in the inverter circuit 4, vu is a sinusoidal U-phase control voltage, and the PWM signal Up obtained by comparing the carrier signal vc with the U-phase control voltage vu is an inverter circuit. 5, and is added as a control signal for the U-phase upper arm transistor of the inverter circuit 5. ck is a synchronization signal of the carrier signal vc,
This is an interrupt signal when the carrier counter counts up and overflows.

From the output signals H1, H2, and H3 of the rotor position detecting means 7, the time point at which the output signal H1 of the rotor position detecting means 7 changes from low to high is set to 0 ° as the reference electrical angle.
Electrical angles such as degrees, 90 degrees, and 150 degrees are detected, and the electrical angle θ is estimated from the rotation cycle except every 60 degrees.

FIG. 5 shows a waveform diagram of each part when the motor of the washing machine is braked according to the first embodiment of the present invention. The electrical angle is detected from the output signal of the rotor position detecting means 7 to the motor. The waveforms of various parts during braking operation for controlling the applied voltage and the phase command are shown, and a timing chart for braking the motor 6 by passing a current in a phase opposite to the induced voltage Ec is shown. In the case of sine wave drive, the torque can be controlled by controlling the phase of the motor current and the induced voltage, so not only can torque ripple be reduced to reduce vibration, but torque control is also better than square wave drive. It is advantageous.

On the other hand, in the braking method for controlling the current phase, the braking performance is deteriorated unless the electrical angle is correctly estimated from the output signal of the rotor position detecting means 7, and when the rotor position detecting means 7 fails. Has the problem of being unable to brake.

Further, when the inverter circuit 5 is stopped (when a certain time has elapsed after the stop), the bootstrap capacitor 56a is not charged, so the upper arm drive circuit 53a cannot operate. For example, even if the motor drive is stopped during the dehydration operation and the inertial rotation of the washing / dehydrating tub 20 is stopped by the braking control after a predetermined time (about 1 second) has elapsed, the upper arm drive circuit 53a cannot operate and is controlled. There is a problem that it is impossible.

Next, the operation of the first embodiment will be described with reference to FIGS. 6 and 7 are flowcharts of a motor drive device for a washing machine according to the first embodiment of the present invention, FIG. 8 is a graph of motor rotation speed and time in a dehydration process of the washing machine, and FIG. 9 is the same. The output signal waveform diagram of the power supply voltage detection circuit with respect to the AC power supply voltage of the washing machine, and FIG.
It is a washing process diagram of the washing machine.

In FIG. 6, the dehydration process is started in step 300, and the lid lock device 19 is driven in step 301 to prevent the lid 22 from opening during the dehydration process. Next, in step 302, the motor 6 is started. As a start control method, a rectangular wave drive or the like is performed because a larger start torque can be obtained. After the motor 6 is started, the routine proceeds to step 303, where it is switched to the sine wave drive. Thereafter, in step 304, the rotation speed control is performed. In the case of the dehydration operation, the final rotation speed N3 (900 r / min) is targeted, and the rotation speed is increased stepwise as shown in FIG. 8 (for example,
N1: 160 r / min, N2: 220 r / min, N
3: 900 r / min, t1: 5s, t2: 20s, t
3: 80s). During the dehydration operation, in step 305, the state of the AC power supply 1 is detected by the output signal of the power supply voltage detection circuit 15. As shown in FIG. 9, the power supply voltage detection circuit 15 forms a pulse signal when power is normally supplied from the AC power supply 1, and a pulse signal when the power supply of the AC power supply 1 is stopped. Are configured to be stopped, and output this signal to the control circuit 10. Even if the voltage value of the AC power supply 1 is about 25% of the steady state, it is assumed that power is supplied, a pulse signal is formed, and when the supply is completely stopped, the pulse signal is stopped.

At step 306, due to a power failure or the like,
When it is detected that the power supply from the AC power supply 1 is stopped, the process proceeds to step 320 of the flowchart shown in FIG. 7 and the process during the power stop is performed. When it is detected that the AC power supply 1 is not stopped, the process proceeds to step 307, and the DC voltage detection means 4 detects the DC voltage VDC1. The DC voltage detected by the DC voltage detection means 4 is
Since it corresponds to the AC voltage 1, the voltage value of the AC voltage 1 can be calculated from the DC voltage VDC1. In the configuration in which the double voltage DC voltage is generated across both ends of the capacitors 3b and 3c described above, for example, when the AC voltage 1 is 100V (effective value), the DC voltage is about 280V (because it is twice the peak voltage of the AC voltage). Becomes In step 308, it is determined whether or not the DC voltage VDC1 is equal to or lower than a first predetermined voltage value (for example, 70V). When it is determined that the DC voltage VDC1 is equal to or lower than the first predetermined voltage value, the process proceeds to step 320, and the same processing during the power stop is performed as when it is determined that the AC power supply 1 is stopped.

Generally, the AC power supply 1 supplied to a home may be momentarily stopped or its voltage value may be lowered due to a lightning strike or the like. Even if such a situation occurs during the operation of the device, it is necessary to continue the operation of the device. Therefore, as described above, the operation is continued even if the AC power supply is momentarily stopped or the voltage value is lowered.

When it is determined in steps 306 and 308 that the AC power supply 1 has not stopped or the voltage value has not dropped, it is determined in step 309 whether the first predetermined time (for example, 5 minutes of dehydration time) has elapsed. The dehydration operation is continued until a predetermined time has passed. After the lapse of a predetermined time, in order to stop the washing and dehydrating tub 20, in step 310, as shown in FIG.
Perform the brake control shown in. After that, washing and dewatering tank 2
After detecting and confirming that 0 has stopped, step 31
Go to 1 and unlock the lid lock. Then, the process proceeds to the next step shown in FIG. That is, the water supply process is performed in the rinsing process, and the washing operation is ended in the dehydration process.

On the other hand, in steps 306 and 308, when it is detected that the AC power supply 1 is stopped or the voltage value is lowered, the processing during the power stop of steps 320 to 333 shown in FIG. 7 is performed.

That is, in step 320, all the transistors of the inverter circuit 5 are turned off in order to stop the driving of the motor 6. If the motor 6 is continuously driven with the AC power supply 1 stopped or the voltage value lowered, the electric power stored in the capacitors 3b and 3c is instantly consumed,
The power supply to the control circuit 10 is stopped and the operation of the control circuit 10 is stopped. Therefore, even if a power failure occurs for a predetermined time (for example, 3 seconds), after recovering from the power failure, the driving of the motor 6 and the like is stopped so that the washing operation can be continued. In step 321, the state of the AC power supply 1 is detected by the output signal of the power supply voltage detection circuit 15. In step 322, it is determined whether or not the AC power source 1 has power. If it is determined that the AC power supply 1 is stopped, step 32
If the time from the start of the processing during the power stop does not reach the second predetermined time (for example, 5 seconds), the process returns to step 321 and then the AC power supply 1 is restored in step 322. To detect. When it is detected in step 322 that the power supply from the AC power supply 1 is restarted, next,
In step 323, the DC voltage detection means 4 causes
The DC voltage value VDC2 is detected to determine how much power is restored. In step 324, the DC voltage value VDC2
However, if it is determined that the voltage is equal to or higher than the second predetermined voltage value (for example, 140 V, 50 V in the AC voltage), it is determined that the AC power source 1 supplies normal power, and the process proceeds to step 330, and the motor 6 is operated during the dehydration operation. The short-circuit brake control for stopping the washing / dehydrating tub 20 which is rotating by inertia rotation due to the suspension of the above operation is started.

The short-circuit brake is the lower arm transistor 51.
a ', 51b', 51c 'or upper arm transistor 5
By conducting all of 1a, 51b, 51c, a back electromotive force is generated in the motor 6, and the back electromotive force causes a motor current to flow through the motor coil, which results in a braking operation. As described in FIG. 3, the upper arm transistors 51a and 51a
Bootstrap operation is required to make b and 51c conductive, but lower arm transistors 51a ', 5
To make 1b 'and 51c' conductive, it is sufficient to add the lower arm drive signals Un, Vn, Wn. Since making the lower arm transistors 51a ′, 51b ′, 51c ′ conductive is the same as the bootstrap operation, making the lower arm transistors 51a ′, 51b ′, 51c ′ conductive and then the upper arm transistors 51a, 51b, 51c. No procedure is required to conduct the. However, the operation is the same even if the lower arm transistors 51a ', 51b', 51c 'are all made conductive and then the upper arm transistors 51a, 51b, 51c are driven.

The short-circuit brake control is continued until the washing / dehydrating tub 20 is stopped. In step 331, the output signal from the rotor position detecting means 7 is detected, and in step 332,
It is determined whether or not there is a change in the output signal, and if there is no change in the output signal, it is determined that the motor 6 (washing / dehydrating tub 20) has stopped. If it is determined that the motor 6 has stopped, the process proceeds to step 333, all transistors are turned off, and the short-circuit braking is finished. Since the dehydration operation is stopped due to a power failure or the like, the dehydration step is performed again during the dehydration step shown in FIG. In the flow chart of FIG.
Returning to step 302, the dehydration operation is performed again. And
The dehydration operation is performed until the first predetermined time, that is, the time newly counted from the restart.

In the above embodiment, the first predetermined time is the time newly measured from the restart, but the same effect can be obtained by subtracting the time until the AC power supply is stopped from the initially set dehydration time. It goes without saying that you can get

On the other hand, in step 324, the AC power source 1
If it is determined that the normal power is still not supplied, the process from step 321 to step 324 is repeated until the power is normally supplied.
In step 325, it is determined whether or not the time from the start of the processing during the power stop has passed a second predetermined time (for example, 5 seconds) or more, and if the second predetermined time or more has passed, the AC power source 1 It judges that there is no possibility that the normal supply of electric power will be resumed, and proceeds to step 326 to stop all operations of the control circuit 10 and the like by itself. Then, in step 327, the operation of the washing operation is ended.

As described above, in this embodiment, when a momentary power failure or the like occurs during the dehydration operation, the operation of the dehydration is stopped, and when the power failure or the like is resolved thereafter, the rotation of the dehydration is short-circuited. Since the rotation of the washing / dehydrating tub during the dewatering operation can be stopped with a simple and inexpensive structure by stopping with the brake, it is possible to provide a washing machine with improved safety.

Further, during the dehydration operation, the rotation of the washing / dehydrating tub is stopped by an accident such as a power failure, and the dehydration operation is performed again, so that even if the dehydration operation is interrupted, the dehydration operation is performed again. Therefore, it is possible to avoid deterioration of performance such as dehydration.

Furthermore, by setting the time for performing the dehydration operation again to the time that is obtained by subtracting the time until the AC power supply is stopped from the initially set dehydration time, the extension of the time required for the laundry operation can be suppressed as much as possible. The waste of energy consumption can be suppressed.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

FIG. 11 is a flow chart of a motor drive device for a washing machine according to the second embodiment of the present invention, and FIG.
It is a flow chart of a motor drive of the washing machine.

In FIG. 11, the dehydration process starts in step 400, and the lid lock device 19 is driven in step 401 to prevent the lid 22 from opening during the dehydration process. Next, in step 402, the motor 6 is started. As a method for starting control, rectangular wave drive or the like is performed because a larger starting torque can be obtained. After the motor is started, the process proceeds to step 403 to switch to sine wave drive. Step 40
Rotation speed control is performed from 4. In the case of the dehydration operation, the final rotation speed N3 (900 r / min) is targeted, and the rotation speed is increased stepwise as shown in FIG. 8 (for example, N1: 160 r).
/ Min, N2: 220r / min, N3: 900r /
min, t1: 5s, t2: 20s, t3: 80s).
In step 405, it is determined whether or not a first predetermined time (for example, 5 minutes) has elapsed. If it is determined that the predetermined time has elapsed, the dehydration operation is ended, the process proceeds to step 406, and the washing / dehydrating tub 20
Brake control is performed to stop. The brake control method is as shown in FIG. Even during brake control,
In the same manner as described in the first embodiment, the stop determination of the AC voltage 1 and the detection of the voltage drop are performed in steps 407 to 4
Do 10

In step 411, the output signal from the rotor position detecting means 7 is detected, and in step 412 it is judged whether or not there is an output signal. If there is an output signal, the motor 6 (washing / dehydrating tub 20) is detected. ) Is stopped (no output signal), it is determined from step 406 to step 4
12 processing is performed.

When it is determined that the motor 6 (washing / dehydrating tub 20) has stopped, the routine proceeds to step 413, where all the transistors are turned off and the brake control is ended. Then, in step 414, the lid lock is released, and the process proceeds to the next step shown in FIG.

On the other hand, step 406 during brake control.
From Step 412 to Step 412, when the stop of the AC voltage 1 or the detection of the voltage drop is detected, Step 42
The process proceeds to 0 and the processing during the power stop is performed.

Incidentally, steps 407 to 410
6 is the same as the processing contents of step 305 to step 308 of FIG. 6 shown in the first embodiment, detailed description thereof will be omitted.

FIG. 12 shows the processing during the power stop. The contents of the processing during the power stoppage are the same as step 32 in FIG. 7 of the first embodiment.
Since the processing contents are the same as the processing contents from 0 to step 333, detailed description thereof will be omitted.

When it is detected in steps 421 to 424 that the supply of normal power from the AC power source 1 is restarted, short-circuit brake control is performed in steps 430 to 433 to stop the washing / dehydrating tub 20. After completion of the short-circuit brake control, step 414 in FIG.
Then, the lid lock is released and the process proceeds to the next step shown in FIG. When the power stop is detected during the braking process in the rinse step, it is not necessary to perform the dehydration operation again, so it is confirmed that the washing / dehydrating tub 20 has stopped, and the process proceeds to the next process, that is, the water supply process. , Continue washing operation.
Also, during the braking process in the dehydration process, if the power stop is detected, it is not necessary to perform the dehydration operation again,
After confirming that the washing / dehydrating tub 20 has stopped, the operation of the washing operation is ended.

As described above, in the present embodiment, even if a momentary power failure or the like occurs during the dehydration brake and then the power failure is resolved, the rotation of the washing / dehydrating tub during the dehydration brake is simplified. Since it can be stopped with an inexpensive structure, it is possible to provide a washing machine with improved safety.

Even if a sudden accident such as a power failure occurs, the washing / dehydrating tub is stopped from rotating and the next step is continued so that the washing operation is performed to the end. In addition, since a wasteful operation is not repeatedly performed, it is possible to provide a washing machine that can end the laundry operation within a predetermined time without increasing the operation time.

[0069]

As described above, according to the first, second, and third aspects of the present invention.
According to the inventions described in (5) and (5), when a momentary power failure or the like occurs, the dehydration operation or the dehydration brake is stopped, and when the power failure or the like is resolved after that, the rotation of the dehydration is stopped by the short-circuit brake. As a result, the rotation of the washing / dehydrating tub during the dehydration operation can be stopped with a simple and inexpensive structure, and thus a washing machine with improved safety can be provided.

Further, according to the invention described in claim 4 of the present invention, even if the dehydration operation is interrupted, the dehydration operation of the same step is performed again, so that it is possible to avoid a decrease in performance such as dehydration.

Further, according to the invention described in claim 6 of the present invention, even if a sudden accident such as a power failure occurs,
Since the washing operation is performed to the end and the wasteful operation is not repeatedly performed, it is possible to provide a washing machine that can finish the washing operation at a predetermined time without increasing the operation time.

[Brief description of drawings]

FIG. 1 is a block circuit diagram of a washing machine according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the washing machine.

FIG. 3 is a circuit diagram of an inverter circuit of the washing machine.

FIG. 4 is a waveform diagram of each part when the washing machine is driven by a motor.

FIG. 5 is a waveform chart of each part of the washing machine when the motor is braked.

FIG. 6 is a flowchart of a motor drive device of the washing machine.

FIG. 7 is a flowchart of a motor drive device of the washing machine.

FIG. 8 is a graph of motor rotation speed and time during a dehydration process of the washing machine.

FIG. 9 is an output signal waveform diagram of the power supply voltage detection circuit with respect to the AC power supply voltage of the washing machine.

[Figure 10] Washing process diagram of the washing machine

FIG. 11 is a flowchart of a motor drive device for a washing machine according to a second embodiment of the present invention.

FIG. 12 is a flowchart of a motor drive device of the washing machine.

[Explanation of symbols]

1 AC power supply 3 rectifier circuit 4 DC voltage detection means (power supply voltage detection means) 5 Inverter circuit 6 motor 7 Rotor position detection means 10 Control means 15 Power supply voltage detection circuit (power supply voltage detection means)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Miho Kubo             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Shoichi Matsui             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F term (reference) 3B155 AA06 BA01 BA21 BB10 CA06                       CA16 CB06 DA09 HB10 HB24                       KA33 KA36 LA04 LC02 LC15                       LC28 MA01 MA05 MA09                 5H560 AA10 BB04 BB12 DA03 DA19                       DB20 DC12 DC13 EB01 EC01                       EC10 GG04 HB05 JJ09 JJ20                       RR10 SS07 TT01 TT15 UA03                       UA06 XA12

Claims (6)

[Claims] 1. A rectifier circuit which is connected to an AC power source and converts the AC power into DC power, and an inverter circuit which converts the DC power converted by the rectifier circuit into AC power.
A motor driven by the inverter circuit; rotor position detecting means for detecting a rotor position of the motor; power supply voltage detecting means for detecting a voltage state of an AC power supply; and control means for controlling the inverter circuit, When the power supply voltage detection means detects a voltage drop of the AC power supply or a stop of the AC power supply while the motor is being driven, the control means stops the driving of the motor and then the power supply voltage. A washing machine in which the rotation of the motor is stopped by a short-circuit brake when the detection means detects again that the AC power supply has returned to a normal voltage state. 2. A rectifier circuit which is connected to an AC power source and converts the AC power into DC power, and an inverter circuit which converts the DC power converted by the rectifier circuit into AC power.
A motor driven by the inverter circuit; rotor position detecting means for detecting a rotor position of the motor; power supply voltage detecting means for detecting a voltage state of an AC power supply; and control means for controlling the inverter circuit, The control means, during the braking operation of the motor, when the power supply voltage detection means detects a voltage drop of the AC power supply or a stop of the AC power supply, the braking operation of the motor is stopped, and thereafter,
A washing machine in which rotation of the motor is stopped by a short-circuit brake when the power supply voltage detecting means detects again that the AC power supply has returned to a normal voltage state. 3. A washing / dehydrating tub that is rotatably provided in an outer tub and is driven by a motor. While the motor is being driven, the washing / dehydrating tub is rotated by the motor. The washing machine according to claim 1, which is in a dehydration operation. 4. The washing machine according to claim 3, wherein the control means performs the dehydration operation again after stopping the rotation of the washing and dehydrating tub. 5. A washing / dehydrating tub rotatably provided in the outer tub and driven by a motor, wherein the rotation of the washing / dehydrating tub by the motor is stopped during the braking operation of the motor. The washing machine according to claim 2, wherein the washing brake is being used. 6. The washing machine according to claim 5, wherein the control means continues the next step after stopping the rotation of the washing and dehydrating tub.