JPH1127985A - Inverter device and washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inverter-controlled washing machine which can be inverted quickly by skillfully detecting the position of a rotor, when a DC brushless motor is controlled. SOLUTION: An inverter device is provided with a motor 21 which can be braked electrically, a transmitter which transmits the rotation of the motor 21 and has a play, and switching elements 35a-35f which are respectively attached to upper and lOer arms in threes respectively for supplying a drive current to the motor 21. The inverter device also has a rotation mode in which the motor 21 is rotated and a stop mode in which the motor 21 is braked. In the stop mode, periods during which the switching elements 35a-35f are turned off are respectively provided, before and after the braking period of the motor 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an inverter device for driving a motor and a washing machine.

[0002]

2. Description of the Related Art A conventional general washing machine uses a single-phase induction motor, which rotates a pulsator or a dehydration tub at a rotation speed determined by a commercial power supply frequency. In this case, the number of revolutions is switched by using, for example, a clutch according to the frequency of the commercial power supply, and the number of revolutions is variably controlled by a reduction gear and a pulley or a belt provided for adjusting the number of revolutions and torque. .

[0003] Control methods such as an on / off method and a phase control method have been proposed to vary the number of revolutions of the single-phase induction motor.
There was a problem that the variable width was also narrow. In order to eliminate these disadvantages, recently, an inverter control type washing machine using a three-phase motor has been proposed. The three-phase motor refers to an induction motor or a three-phase DC brushless motor.

In order to drive the three-phase motor, it is necessary to apply a three-phase alternating current having a phase difference of 120 ° to the three-phase motor. Therefore, as shown in FIG. 20, a power transistor or an IGBT (Insulated
6 switching elements such as Gate Bipolar Transistor)
The arm configuration corresponding to each phase using
It has a phase full-wave bridge configuration. FIG. 20 shows the case where the transistors 35a to 35f are used. Upper arm transistors 35a to 35c and lower arm transistor 35
d to 35f are connected to each phase (U phase, V phase) of the motor 21.
Phase, W phase).

[0007] Referring briefly to FIG. 20, a commercial power supply 54 is once converted to a DC voltage by a rectifier circuit 53 and a smoothing capacitor 52. Then, this DC voltage is supplied to each of the arms. Transistor 3 constituting each arm
5a to 35f are on / off controlled by drive circuits 36a to 36f. The drive circuits 36a to 36f include a control unit 90.
Sends a drive signal.

Thus, three-phase alternating current is generated by a signal from the control unit 90. Then, the three-phase alternating current is supplied to the three-phase motor 21 to drive the three-phase motor 21. Note that diodes 34a to 34f for freewheeling are connected in parallel with the transistors 35a to 35f, respectively.

The lower arm drive circuits 36d to 36d
f is supplied with power by a common power supply circuit 37d. On the other hand, in the upper arm drive circuits 36a to 36c, the emitters of the transistors 35a to 35c are connected to the respective phase windings (U phase, V phase, (W phase) and is in a floating state.
7c is provided.

When a DC brushless motor is used as the three-phase motor 21, there is an advantage that noise can be reduced and vibration can be reduced as compared with an induction motor. In general, a DC brushless motor includes a three-phase armature winding, a rotor formed of permanent magnets, and Hall elements 40a to 40c for detecting a rotational position of the rotor. DC brushless motors are different from induction motors in that Hall elements 40a to 40c
A three-phase alternating current is generated based on a signal synchronized with the rotor position detected in step (1), and the three-phase alternating current is supplied to the armature winding to rotate.

In a washing machine, as shown in FIG. 21, the pulsator is operated so as to rotate intermittently in a forward rotation, a stop, a reverse rotation, a stop, and so on. In order to completely stop the motor, for example, the upper arm transistors 35a to 35c are turned off and the lower arm transistors 35d to 35f are turned on to apply a brake. In FIG. 21, signals HU,
HV, HW, HW, LU, LV, LW are transistors 35a, 35b, 35c, 35d, 35e, 35, respectively.
represents a drive signal output from the control unit 90 for controlling f.

[0010]

In the above-mentioned conventional washing machine (FIG. 20), to drive the upper arm transistors 35a-35c, three different reference levels are used.
Since the independent drive power supply circuits 37a to 37c are required, four power supply circuits 37a to 37d are required for the inverter unit constituting the arm. Also, in order to adapt the signal level of the drive signal output from the control unit 90 such as a microcomputer to the inverter unit, an insulating circuit 55 such as photocouplers 55a to 55f is usually required at the interface between the inverter unit and the control unit 90. Had become.

Further, since a power supply circuit 37e for the control unit 90 is required, at least five independent power supply circuits are required in the above-mentioned conventional washing machine. In addition, since the insulating circuit 55 is indispensable in the interface portion, the circuit becomes complicated, the circuit board becomes large, and the number of components increases, which causes a decrease in reliability. This has also caused an increase in the cost of the circuit.

When the DC brushless motor 21 is used as the three-phase motor, it is indispensable to detect the rotor position using the Hall elements 40a to 40c. Failure to start.

In the above-mentioned conventional washing machine, the pulsator repeats forward rotation, stop, reverse rotation, stop... At the time of easy washing, etc., so that the electric brake is applied as shown in FIG. Thus, the motor is completely stopped so that the rotor does not fluctuate so that the rotor position can be detected well. However, in practice, when the motor is connected to the pulsator or the dehydration tub via a pulley, a belt, or a reduction gear, the deviation of the rotor position detection occurs due to the deflection of the belt and the play of the reduction gear, and the starting failure occurs. And a step-out phenomenon had occurred.

SUMMARY OF THE INVENTION The present invention solves the above-described problems. In an inverter control type washing machine, the number of independent power supply circuits is reduced to reduce the size of the circuit. An object of the present invention is to provide a washing machine capable of detecting a position and quickly performing a reversing operation.

[0015]

According to a first aspect of the present invention, there is provided a motor capable of applying an electric brake, a play device for transmitting rotation of the motor, In an inverter device including switching elements respectively connected to an upper arm and a lower arm for supplying a drive current to each phase of the motor, a rotation mode for rotating the motor and a stop mode having a period for applying the electric brake. In the stop mode, a period for turning off all the switching elements is provided before and after a period for applying the electric brake to the motor.

According to such a configuration, the inverter device drives the motor by supplying the drive current. When the motor is intermittently rotated, such as in the washing process and the rinsing process of the washing machine, the inverter device has a stop mode in which the electric brake is applied during the rotation mode. Are turned off for a certain period. Next, for example, by turning off all the switching elements of the upper arm and turning on all the lower arms, the electric brake is applied to stop the motor. And
After turning off all the switching elements again, the mode shifts to the rotation mode. The play includes not only a mechanical margin such as a backlash of a gear but also a bending of a belt or the like under tension.

Further, in the second configuration of the present invention, the first
In the configuration, the electric brake is performed by turning off all the switching elements of the upper arm and turning on all the switching elements of the lower arm.

According to such a configuration, the inverter device applies the electric brake by turning off all the switching elements of the upper arm and turning on the switching elements of the lower arm in the stop mode. That is, since the switching elements are provided with the freewheel diodes so as to be in parallel with each other, the brake is applied because the regenerative current is attenuated on the lower arm side.

Further, in the third configuration of the present invention, the first
In the above configuration, the electric brake is performed by turning on all switching elements of the upper arm and turning off all switching elements of the lower arm.

According to such a configuration, the inverter device turns on the upper arm and turns off the lower arm in the stop mode, so that the regenerative current flows to the upper arm side to apply a brake.

Further, in the fourth configuration of the present invention, the first
In the configuration, a brake arm including a resistor and a switching element is connected to both ends of the upper arm and the lower arm, and the electric brake turns off all the switching elements of the upper arm and the lower arm,
This is performed by turning on the switching element of the brake arm.

According to such a configuration, the inverter device turns on the switching element of the brake arm in the stop mode to loop the regenerative current, and attenuates the current by the resistance provided on the brake arm to reduce the electric current. Apply the brake.

Also, in the fifth configuration of the present invention, the first
In any one of the fourth to fourth configurations, the apparatus further includes means for detecting a rotor position of the motor, wherein in the stop mode, the rotor position is detected after the electric brake is applied for a predetermined time, and the rotor position is detected for a predetermined time. If they do not match, the electric brake is applied for a certain period of time until the rotor positions match.

According to such a configuration, when the inverter shifts from the rotation mode to the stop mode, first, all the switching elements of the upper arm and the lower arm are turned off.
Next, the electric brake is applied by turning off the upper arm and turning on the lower arm for a certain period of time, for example, and after all the switching elements are turned off, the rotor position is detected. Thereafter, the brake is applied again for a predetermined time, and all the switching elements are turned off, and then the rotor position is detected. If the rotor position has not changed before and after the brake, the rotor has completely stopped, and the mode shifts from the stop mode to the rotation mode to rotate the motor, for example, by reversing the rotation direction.

In the sixth configuration of the present invention, the first
Any one of the fourth to fourth configurations, further comprising a unit for detecting a rotation speed of the motor, wherein a period for turning off all the switching elements is provided immediately after shifting from the rotation mode to the stop mode. The time for applying the electric brake is determined based on the rotation speed of the motor.

According to such a configuration, the inverter device detects the rotation speed of the motor at the end of the OFF period of all the switching elements provided at the start of the stop mode, for example, and increases the brake time when the rotation speed is high, Conversely, when the rotation speed is low, the braking time is shortened. As a result, the brake time is determined until the vehicle completely stops according to the rotation speed.

Further, in the seventh configuration of the present invention, the sixth configuration is used.
Immediately after shifting from the rotation mode to the stop mode, a period for turning off all the switching elements is provided, and before and after the start of the period, the rotation speeds of the motors are detected. From the acceleration, and the time to apply the electric brake is determined based on the acceleration.

According to such a configuration, the inverter device detects the rotational speed of the motor at the start and end of the period in which all the switching elements provided first are turned off at the time of transition to the stop mode, and detects the rotational speed of the motor from these rotational speeds. Find the acceleration. When the acceleration is large, a large brake is applied by the resistance of the transmission mechanism or the like without applying the brake, so that the braking time is shortened to shorten the braking time. On the other hand, when the acceleration is small, the brake time is lengthened to completely stop the motor.

Further, in the eighth configuration of the present invention, the first
In any one of the fourth to fourth configurations, when shifting from the rotation mode to the stop mode, a current of the motor is detected, and a time for applying the electric brake is determined based on the current.

According to such a configuration, the inverter device detects the current flowing through the motor when shifting to the stop mode, and determines the braking time based on the current value. For example, when the current value is large, the rotation speed is high, so the braking time is lengthened. Conversely, when the current value is small, the rotation speed is low, so the braking time is shortened.

Also, in the ninth configuration of the present invention, the first
In any one of the fourth to fourth configurations, the time for applying the electric brake is determined based on the regenerative current of the motor in the stop mode.

According to such a configuration, the inverter device detects the regenerative current in the stop mode, and if the regenerative current is large, the inverter rotates faster, so that the braking time is lengthened. Shorten.

In a tenth aspect of the present invention, in any of the first to ninth aspects, the transmission device transmits the rotation of the motor via a belt.

In such a configuration, the transmission device is provided with, for example, a pulley on the rotating shaft of the motor, and a belt is hanged on the pulley to transmit the rotation of the motor. As a result, the rotation mode is set after the tension applied to the belt is removed, so that the inverter device can detect the rotor position well even if a transmission mechanism using the belt is provided.

According to an eleventh aspect of the present invention, in a washing machine having an inverter for driving a three-phase motor, the washing machine is connected to an upper arm and a lower arm for supplying a drive current to each phase of the three-phase motor. Switching element, a driving circuit for driving each of the switching elements, a power supply circuit for applying power to each of the driving circuits for the lower arm, and a driving circuit for each of the upper arms via diodes from the power supply circuit. And a bootstrap type power supply circuit for charging the capacitor.

According to such a configuration, the washing machine controls the on / off state of the switching element provided on the arm to perform the control.
Generate a phase alternating current and drive a three-phase motor. Among the drive circuits for driving these switching elements, the one on the lower arm side has a common ground side, so that a single power supply circuit supplies power to the drive circuit. On the other hand, the upper arm side has a bootstrap system circuit, which charges capacitors via diodes, and supplies power to each drive circuit by these capacitors.

According to a twelfth configuration of the present invention, in the eleventh configuration, a control circuit for outputting a drive signal to each of the drive circuits is provided, and the power supply circuit supplies power to the control circuit. .

In such a configuration, the control circuit and the power circuit of the drive circuit need only be a single power circuit.

According to a thirteenth configuration of the present invention, in the eleventh configuration, a control circuit for outputting a drive signal to each of the drive circuits is provided, and the drive circuit is a high withstand voltage IC. Is provided with a level shift circuit for level-shifting the drive signal to a reference potential of each drive circuit of the upper arm.

In such a configuration, a high withstand voltage IC in which a drive drive circuit is integrated in a washing machine is used. In the upper arm, the drive signal from the control circuit is set to the reference level of the drive circuit in the upper arm. The signal level is changed using a level shift circuit such as a high breakdown voltage transistor to be adapted, and is input to the drive circuit.

According to a fourteenth configuration of the present invention, in any one of the eleventh to thirteenth configurations, the inverter device is any one of the first to tenth configurations.

According to such a configuration, when the washing machine performs the braking operation, for example, all the upper arms are turned off and all the lower arms are turned on. At this time, the capacitors of the bootstrap circuit are charged, and Power can be supplied to the drive circuit.

[0043]

BEST MODE FOR CARRYING OUT THE INVENTION

<First Embodiment> Hereinafter, a first embodiment of a washing machine to which the present invention is applied will be described with reference to the drawings. FIG.
2 shows a schematic configuration of the inside of the washing machine of the present embodiment. The washing machine 1 is a one-tub type fully automatic washing machine, and includes a dehydration tub 12 and a water tub 13 which also serve as a washing tub inside a main body 11. The water tank 13 is formed by the suspension unit 14 and the main body 11.
The dewatering tank 12 is rotatably installed inside the water tank 13. A pulsator 15 is provided at the bottom of the dewatering tank 12. The main body 11 has a lid 11a for taking in and out laundry.

The washing machine 1 includes a water supply pipe 16 for supplying water to a water tank 13, a water supply valve 17 for controlling water supply, and a water tank 13.
A water distribution pipe 18 for draining water from the water, a drain valve 19 for controlling drainage, and a circulation pump 20 for circulating water in the water tank 13 are provided. Normally, the water supply pipe 16 is connected to a water supply, but it is also possible to connect the water supply pipe 16 to a bath pump (not shown) to inject bath water into the water tank 13.
In addition, by operating the circulation pump 20, air can be mixed into the water in the water tank 13 to promote the dissolution of the detergent and enhance the washing effect.

A motor 21 and a transmission mechanism 22 having a rotating shaft 22a are fixed below the water tank 13. The rotation of the motor 21 is transmitted to the transmission mechanism 22 via a belt 23 hung between a pulley 21b provided on the rotation shaft 21a and a pulley 22b provided on the rotation shaft 22a. The transmission mechanism 22 incorporates a reduction gear and a clutch, and reduces the rotation of the motor 21 to transmit the rotation to the dewatering tank 12 and the pulsator 15.

In the washing step and the rinsing step, the pulsator 15 to which the rotation of the motor 21 is transmitted rotates to generate a rotating water flow in the water tank 13. In the dehydration step, the dehydration tub 12 to which the rotation of the motor 21 is transmitted rotates at the same speed as the pulsator 15, and the centrifugal force generated thereby removes water from the laundry in the dehydration tub 12. The dewatering tank 12 is provided with a number of small holes for discharging the separated water. However, the dewatering tank 12 can be a holeless tank.

The dewatering tub 12 and the pulsator 15 rotate in synchronization with the rotation of the motor 21 when they are connected to the rotating shaft 22a by the clutch, and stop when the motor 21 is stopped. The load applied to the spinning dewatering tank 12 and the pulsator 15 is the load of the motor 21.

An operation unit 24, a display unit 25, a buzzer 26, and a lid sensor 27 for detecting the opening and closing of the lid 11a are provided on the upper part of the main body 11, and a water level in the water tank 13 is provided beside the water tank 13. Is provided. A main control unit (control means) 31 composed of a microcomputer for controlling the entire operation of the washing machine 1 is provided below the operation unit 24. And a control unit (control means) 33 composed of a microcomputer for controlling the rotation of the motor 21 via the drive unit 32. Note that the washing machine may be configured without the circulation pump 20 or the like.

FIG. 2 schematically shows a configuration relating to the operation control of the washing machine 1. The main control unit 31 stores a program describing the operation contents of each step such as washing, rinsing, and dehydration, and the order of execution of the steps, that is, a processing course, and according to this program, the water supply valve 17 and the drain valve 19 are stored. Opening / closing, operation of circulation pump 20, and motor 21 in transmission mechanism 22
The switching of the transmission destination of the rotation is controlled, and the sub control unit 3
3 to control the rotation of the motor 21.

The main controller 31 judges the state of the lid 11a based on the output of the lid sensor 27, and does not start the dehydration step of rotating the dehydration tub 12 at high speed when the lid 11a is open. When the lid 11a is opened in the middle of the dehydrating step, the motor 21 is stopped to stop the rotation of the dehydrating tub 12 immediately.

The processing course includes, in addition to a fully automatic course in which washing, intermediate dehydration, rinsing, and dehydration steps are performed in this order, processing is stopped up to an intermediate step, or processing is started from an intermediate step. There are several courses. The user can wash a desired course by operating the operation unit 24. It is also possible to give an instruction to perform only one arbitrary step.

In the fully automatic course, the cloth amount is detected prior to the washing step. This is a process for calculating an appropriate value of the water level and the number of revolutions of the motor 21. The main control unit 31 sets the pulsator before the water is supplied to the water tub 13 in a state where the laundry is put in the washing tub 12. 15 is rotated for a short time, and the cloth amount is determined from the load applied to the motor 21 at this time. Main controller 31
In the subsequent washing step and rinsing step, the amount of water supplied is controlled while monitoring the output of the water level sensor 28 in accordance with the detected amount of cloth. When rotating the motor 21, the target rotation speed is determined based on the detected cloth amount.

By operating the operation unit 24, the user can specify a desired water level, and can specify the intensity and time of washing, rinsing and dehydration. These manual operations are useful when washing a course other than the fully automatic course. When the intensity of the washing or the like is designated, the main control unit 31 sets the target rotation speed of the motor 21 based on the designation.

The display unit 25 is for displaying information for assisting the user's operation, a process in progress, a remaining time until completion of all processes, and the like. When the lid 11a is open at the start of the spin-drying step or when any abnormality occurs, the main control unit 31 displays the fact on the display unit 25 and emits an alarm sound from the buzzer 26.

In the washing machine 1 of this embodiment, a three-phase four-pole DC brushless motor is used as the motor 21, and drive power is supplied to the motor 21 from an inverter circuit 41 having six switching elements in a three-phase full-wave bridge configuration. I am trying to supply. The drive unit 32 includes the inverter circuit 41,
A drive circuit 45 drives a switching element of the inverter circuit 41 based on a drive signal (inverter signal IS) provided from the sub control unit 25.

As shown in FIG. 2, the main control section 31 transmits control data S1 for controlling the rotation of the motor 21 together with a clock CL indicating the timing thereof, and a sub-control section 33.
Send to The clock CL is not particularly limited, but is 250 Hz in the present embodiment. Clock CL at 250Hz
The reason is that the inverter signal IS is a high frequency of about 3 to 5 kHz, while the commercial power supply 50 Hz or 60 Hz
Therefore, if the frequency is far from these, the influence of noise and the like is reduced.

The sub control unit 33 reads the signal S1 in synchronization with the clock CL. Further, the sub control unit 33 transmits the signal S1 in synchronization with the clock CL. In places where there are many restrictions on wiring such as the washing machine 1 due to waterproofing or the like, serial communication is more efficient than parallel communication because it requires fewer signal lines.

The main control section 31 uses a delay means such as a timer to make the inverter signal IS and the clock CL asynchronous. As a result, noise induced on the line of the clock CL and the signals S1 and S2 by the inverter signal IS is not taken in by the sub-control unit 33, so that there is an effect of preventing malfunction. When the lid is opened during spin-drying, the main control unit 31 stops the supply of the clock CL. When the sub-control unit 33 detects this, the output of the inverter signal IS is immediately stopped, and the motor 21 is stopped immediately. I do. This prevents dangers such as the user's reaching into the spinning tub rotating at high speed.

Next, the configuration of the inverter device incorporated in the washing machine will be described in detail with reference to FIG. The commercial power supply 54 is converted into a pulsating DC by the rectifier 53. For example, a diode bridge is used for the rectification unit 53. The DC voltage rectified by the rectifier 53 is applied to the smoothing capacitor 52.
Is smoothed. Then, this DC voltage is supplied to the drive unit 32 and is converted into three-phase AC by the drive unit 32. When the three-phase AC drive current is supplied to the DC brushless motor 21, the DC brushless motor 21 rotates.

The driving circuit 32 has an inverter circuit 41 (FIG. 2).
Three pairs of arms corresponding to the three phases are formed,
Six transistors 35a, 3 as switching elements
5b, 35c, 35d, 35e, and 35f are provided. As described above, the three transistors 35a to 35c connected to the (+) side of the smoothing capacitor 52 are called upper arms, and the three transistors 35a to 35c connected to the (-) side are called lower arms. .

Then, the six transistors 35a to 35a
f is a freewheel diode 34a in parallel with each other.
To 34f are connected. The connection point between the upper arm and the lower arm corresponds to each phase (U
, V-phase, and W-phase). A drive circuit 36 is provided at the base of each of the transistors 35a to 35f.
a to 36f are connected, and drive the transistors 35a to 35f under the control of the sub control unit 33.

The DC brushless motor 21 is provided with Hall elements 40a to 40c for detecting the rotor position. The rotor position is obtained by the rotor position detection circuit 43 based on signals from the Hall elements 40a to 40c, and the rotor position information is transmitted to the sub control unit 33. A power supply circuit 37b for supplying power to the sub control unit 33 is provided. The power for the drive circuits 36d to 36f on the lower arm side is supplied by a power supply circuit 37a. The power supply circuit 37
A voltage reduced by a transformer or the like is supplied from a commercial power supply 54 to the terminals a and 37b.

For the upper arm, the diodes 50a to 50a are supplied from the power supply circuit 37a by the bootstrap circuit.
The capacitors 51a to 51c are charged through the capacitor 50c. Voltages at both ends of the capacitors 51a to 51c are applied as power supply voltages to the drive circuits 36a to 36c, respectively. Thereby, one power supply circuit 37
a serves as a power supply for the six drive circuits 36a to 36f.

Next, the bootstrap circuit will be described. FIG. 4 is a circuit diagram for explaining the operation of the bootstrap circuit, and shows only one phase (U phase) for simplicity. The diode 50a has an anode connected to the (+) side of the power supply circuit 37a via the resistor R, and a capacitor 51a connected to the cathode.

The voltage across capacitor 51a is applied as the power supply voltage for drive circuit 36a, and its (-) side is connected to the midpoint of transistors 35a and 35d. The resistor R is inserted to limit the charging current of the capacitor 51a. The end point 56 indicates that it is connected to another bootstrap circuit.

To charge the capacitor 51a, the transistor 35d is turned on while the transistor 35a is off. Then, as shown by the arrow G, the capacitor 5 is supplied from the power supply circuit 37a through the diode 50a.
A current flows through 1a, and the capacitor 51a is charged. Thereafter, when the transistor 35d is turned off, the drive circuit 36a operates in the upper arm by the charged electric charge of the capacitor 51a, and the transistor 35a can be turned on.

For continuous operation, the condenser 51a
It is necessary to turn on and charge the transistor 35d at an appropriate timing according to the amount of electric charge discharged. Although the power supply circuits 37a and 37b are provided separately in FIG. 2, a single power supply circuit may be used in common as long as the power supply capacity can be secured.

The circuit of the washing machine normally uses a triac or the like to operate loads such as the drain valve 19, the water supply valve 17, and the bath water pump. The ground of the sub control unit 33 and the inverter circuit side are used. There is no problem in making the ground and the power supply common, so that there is no problem in making the power supply common.

The photocoupler 55 that was required in the above-described conventional washing machine (FIG. 20) is not required in the present embodiment. However, as shown in FIG.
This is because the voltage is internally adjusted by the (high voltage IC) 60 configuration. Input terminal 67 of HVIC 60
Is input with a drive signal from the sub control unit 33. The drive signal is stored in the input buffer 61 so as to cope with the dead time.

The HVIC 60 has driving circuits 36a to 36f
Is built-in. Power for the upper arm is provided by a bootstrap circuit including diodes 50a to 50c and capacitors 51a to 51c provided outside the HVIC 60. In the upper arm, although the reference voltage changes, the signal from the input buffer 61 is adapted to the reference level of the drive circuit 36a by the level shift circuit 62 composed of a high-voltage transistor. In the drive circuit 36 a, the U-phase voltage is monitored by the undervoltage protection circuit 79 and adjusted by the upper arm logic 77. The driving circuits 36b and 36c for the V and W phases have the same configuration.

The transistors 35a to 35a
35f is controlled to generate a three-phase alternating current and drive the motor 21 (see FIG. 3) connected to the terminal 68. The terminals 75 and 76 are terminals to which a DC voltage generated by the rectifier circuit 53 (see FIG. 3) and the smoothing capacitor 52 (see FIG. 3) is input. The HVIC 60 is provided with an overcurrent protection circuit 63 and an undervoltage protection circuit 65, and outputs a warning signal from the circuit 64 when the value exceeds a range such as a rating. Although the power supply circuit 37a and the ground of the power supply of the inverter circuit 41 are made common, there is no problem as described above.

In the present embodiment, the pulsator 15 (see FIG. 1) is intermittently repeatedly rotated forward and backward in the washing and rinsing process, during which the DC brushless motor 21 is electrically braked to stop the motor 21 temporarily. The mode is inserted. Immediately after shifting from the normal mode to the stop mode, as shown in FIG. 6, all the transistors 35a to 35f are turned off, and this switching pattern is continued for a certain period K1. In the period K1, the motor 21 gradually decelerates due to loss due to mechanical friction of a reduction gear, a pulley, etc., and the rotation speed decreases. The period K1 is about 0.1 to 0.8 millisecond, depending on the gear case and the like.

Next, the upper arm transistors 35a-35
35c are all turned off, and the lower arm transistor 35d is turned off.
To 35f are all turned on. In FIG. 6, this is indicated by setting the drive signals (HU, HV, HW) output from the sub-control unit 33 to a low level and setting the drive signals (LU, LV, LW) to a high level. Thereby, the electric brake is applied and the motor 21 is completely stopped as described later. The period K2 is not particularly limited, but may be 0.3 to 0.
It is about 5 milliseconds.

Since the motor 21 is forcibly stopped by the electric brake, an excessive tension is generated in the belt 23 for transmitting the rotation to the gear case 22 of the motor 21, and the deflection occurs. When the mode is shifted to the reverse rotation mode as it is, the rotor of the motor 21 slightly moves due to the bending due to the tension at the moment when the brake is released, and the rotor position is shifted. For this reason, when starting the motor 21, a start failure or a step-out phenomenon occurs.

Therefore, in the present embodiment, as shown in FIG. 6, after the braking period K2, the transistors 36a to 36a-3
A period K3 for turning off all the gates 6f again is provided. As a result, the motor 21 enters the free state, so that the tension applied to the belt 23 is reduced, and the rotor position is not shifted.

After that, if the rotor position is detected at the end of the period K3, the rotor position does not shift, so that it is possible to start up well. In addition, even when shifting from the reverse rotation mode to the stop mode and entering the forward rotation mode,
Periods K1 to K3 are provided, and the same switching pattern is continued.

FIG. 8 shows how the electric brake is applied by the regenerative current. Transistor 35a in rotation mode
In the brake period K2 (see FIG. 6), the upper arm transistors 35a to 35c are turned off and the lower arm transistors 35d to 35f are turned on during the brake period K2 (see FIG. 6). Thereby, the motor 2
The current flowing into one U phase flows out of the V phase and the W phase, passes through the transistors 35e and 35f, respectively, and loops through the freewheel diode 34d. Since the current is attenuated by looping, the motor 21 is braked.

Next, the processing of the sub-control unit 33 for performing the above-described operation will be described. FIG. 7 is a flowchart of the process. First, in step S1, it is determined whether the washing or rinsing process is completed. When the washing or rinsing step is completed by a timer or the like, this processing is completed.

Next, in step S2, the rotation direction of the motor 21 is determined based on the normal rotation flag and the reverse rotation flag. In the case of normal rotation, the process proceeds to step S3, and processing is performed in a predetermined normal rotation sequence. On the other hand, in the case of reversal, the process proceeds to step S13, and processing is performed in a predetermined reverse sequence. In the forward rotation sequence (S3) and the reverse rotation sequence (S13), the U-phase, V-phase, and W-phase are synchronized with the rotor position detection signal.
The drive signals (HU, HV, HW, LU, LV, LW) are output so that a signal having a phase shift of 0 ° is generated. The rotation direction of the motor 21 can be changed by the drive current flowing in each phase (U phase, V phase, W phase).

In the case of normal rotation, the normal rotation sequence of step S3 is continued until the normal rotation mode ends in step S4. When the normal rotation mode ends, the mode shifts to the stop mode. First, the upper arm and the lower arm are all turned off in step S5, and the period K1 is set in step S6.
Until the end of the switching pattern.
When the period K1 ends in step S6, the upper arm is turned off and the lower arm is turned on (ON) in step S7. Then, in step S8, the switching pattern is set to the period K.
2 Continue.

After the end of the period K2, the upper arm and the lower arm are all turned off again in step S9, and the switching pattern is continued in step S10 so as to be in the period K3. After the end of the period K3, the rotor position is detected in step S11. Then, in step S12, the normal rotation flag is set to 0 and the reverse rotation flag is set to 1. Then, the process returns to step S1.

If the normal rotation flag is 0 and the reverse rotation flag is 1, it is determined in step S2 that the rotation mode is the reverse rotation mode, and the flow advances to step S13. In step S11 at the end of the above-described stop mode, the rotor position is detected after the tension of the belt 23 (see FIG. 1) is removed, so that the process proceeds to the reverse rotation sequence of step S13 without causing start-up failure or the like. be able to.

The reverse rotation sequence (S13) is performed in step S
By 14, the rotation is continued until the reverse rotation mode ends. After the reverse rotation mode ends, the mode shifts to the stop mode,
In step S15, all of the upper arm and the lower arm are turned off. Then, this switching pattern is determined in step S1.
At 6, the period K1 is continued. Next, in step S17, the upper arm is turned off and the lower arm is turned on. Then, this switching pattern is continued for a period K2 in step S18.

Next, in step S19, the upper arm and the lower arm are all turned off, and this switching pattern is continued for a period K3 in step S20. Then, step S21
To detect the rotor position, and set the forward rotation flag to 1 and the reverse rotation flag to 0 in step S22. Then, step S1
The process returns to. If the normal rotation flag is 1 and the reverse rotation flag is 0, it is determined in step S2 that the rotation mode is the normal rotation mode.

As described above, according to the present embodiment,
As shown in FIG. 1, the upper arm and the lower arm drive circuits 36a to 36a through a single power supply 37a using a bootstrap circuit.
Since power is supplied to 36f, the number of power supply circuits is reduced,
Cost can be reduced. In addition, since the number of parts is reduced, reliability against a failure or the like is improved. At the same time as the brake operation, the capacitors 51a to 51c
In the rotation mode, the drive circuits 36a to 36c on the upper arm side can be reliably operated.

A switching element such as an IGBT can be used for the transistors 35a to 35f.
Further, in the washing machine of this embodiment (FIG. 1), rotation is transmitted by the belt 23. However, even if a transmission mechanism having a backlash such as a gear is used, there is an effect of alleviating the play due to the backlash. In addition, the accuracy of position detection can be improved. At the time of braking, it is possible to apply a brake by turning on a part of the lower arm, but the maximum effect is obtained when all the lower arms are turned on.

<Second Embodiment> A second embodiment of the present invention will be described. Since it is almost the same as the first embodiment, the description of the overlapping parts will be omitted. In the first embodiment, the regenerative brake is applied by the lower arm. However, in the present embodiment, a part of the processing is changed, and the regenerative brake is applied by the upper arm.

FIG. 9 shows a flowchart of the processing in the sub-control section 33 (see FIGS. 1 and 2). The upper arm is turned on and the lower arm is turned off in steps S25 and S26 in the period K2. Only the processing is different from the processing of the first embodiment (FIG. 7), and the other processing is the same.

In the braking period K2, a regenerative current flows through the upper arm as shown in FIG. FIG. 10 shows an example of a case in which the transistor 35a is turned on in the rotation mode and the mode is shifted to the stop mode. After shifting to the stop mode, the upper arm transistor 35a
To 35c are turned on, and the lower arm transistors 35d to 35d are turned on.
5f turns off. Accordingly, the current flowing into the U phase of the motor 21 flows out of the V phase and the W phase, passes through the freewheel diodes 34b and 34c, and loops through the transistor 35a. The brake is applied in this way.

After the brake operation, the upper arm may be turned off and the lower arm may be turned on to charge the capacitors 51a to 51c (see FIG. 3) constituting the bootstrap circuit. At this time, charging ends immediately, so that no large time loss occurs.

<Third Embodiment> A third embodiment of the present invention will be described. In FIG. 11, a braking arm comprising a resistor 70 and a switching element transistor 71 is connected to both ends of the (+) side and the (-) side of the DC voltage supplied to the transistors 35a to 35f of the upper arm and the lower arm. It is a partial circuit diagram of an inverter device. Other parts are almost the same as those in the first embodiment, and there are some changes in the processing. This processing will be described.

FIG. 12 is a flowchart of the processing of this embodiment, which is almost the same as the processing shown in FIG.
The only difference is that the switching patterns of 1 to K3 (see FIG. 6) are changed. Since the other processes are the same, the same reference numerals are given and the description is omitted.

When the mode is shifted from the normal rotation mode to the stop mode, the upper arm, the lower arm, and the brake arm are turned off in the period K1 as in step S30. next,
The brake operation in the period K2 is performed by turning off the upper arm and the lower arm and turning on the brake arm as in step S31. Then, in period K3, step S
At 32, the upper arm, the lower arm, and the brake arm are turned off, and the motor is set in a free state.

Also in the case where the mode is shifted from the reverse rotation mode to the stop mode, in the period K1, the switching pattern is the same as that in the step S30 in step S33 in step S33. Period K2
In step S34, the same switching pattern as in step S31 is used. In the period K3, step S35
And the same switching pattern as in step S32.

After the braking operation, a switching pattern may be added in which the upper arm is turned off and the lower arm is turned on to charge the capacitors 51a to 51c constituting the bootstrap circuit.

<Fourth Embodiment> A fourth embodiment of the present invention will be described. In the washing machine of the present embodiment, the motor 21 (see FIG. 3) is improved so as to apply a plurality of brakes and check whether or not the motor 21 (see FIG. 3) has been completely stopped. Note that the other parts are the same as those in the first embodiment, and a duplicate description will be omitted.

As shown in FIG. 13, when the mode is shifted from the normal rotation mode to the stop mode, the motor 21 is first set to the free-run state in the period T1. This period T1 is about 0.1 to 0.5 millisecond as described above, and is uniquely determined in the washing step. In the next period T2, all upper arms are turned off and all lower arms are turned on. The period T2 is about 0.3 to 0.5 millisecond as described above. Subsequent period T
3 Turn off all the upper arm and lower arm again and
To a free state, and relax the belt tension. This prevents the rotor position from moving, but the rotor position may shift due to external factors such as remaining tension and vibration.

Therefore, in the present embodiment, the rotor position is detected at the end point t1 of the period T3, and is temporarily stored in a memory built in the sub control unit 33 (see FIG. 3). Then, the brake is applied again in the period T2a, and the motor 21 is set in the free state in the period T3a. At the end time t2 of the period T3a, the rotor position is detected and compared with the rotor position at time t1 stored in the memory.

If the rotor positions match, it is determined that the rotor is not moving, the stop mode is ended, and the mode shifts to the reverse rotation mode. If they are different, the sub-controller 33 replaces and stores the rotor position detected at the time point t2 with the previous position information. And the braking period T again
2b and a free period T3b of the motor 21 are provided, the rotor is detected at the end point t3 of the period T3b, and compared with the rotor position information stored last time.

If they match, the mode shifts to the rotation mode. If they are different, the information of the rotor position stored in the memory is updated, and a braking period and a free period are provided. Thus, this operation is repeated until the rotor positions match. If the braking time is sufficient in the braking period T2, the braking periods T2a, T2b, etc., can be sufficiently shorter than the initial braking period T2.

FIG. 14 shows a flowchart of the processing for performing the above-mentioned operation. In this figure, only the processing part in the case of shifting from the rotation mode by the normal rotation sequence to the stop mode is shown.

The normal rotation sequence of step S40 is continued until it is determined in step S41 that the rotation has ended. When the normal rotation sequence (S40) ends, the upper arm and the lower arm are all turned off in step S42, and the switching pattern continues for a period T1 in step S43. Next, in step S44, the upper arm is turned off, the lower arm is turned on, and the brake is applied. The period during which the brake is applied in step S45 is T2.

Next, in step S46, the upper arm and the lower arm are all turned off, and this switching pattern is changed to step S46.
At 47, the period T3 is continued. Next, in step S48, the rotor position is detected and stored in a memory built in the sub control unit 33. Then, in step S49, the upper arm is turned off and the lower arm is turned on to apply the brake, and step S49 is performed.
At 50, the period T2a continues. Then, in step S51, the upper arm and the lower arm are all turned off, and this switching pattern is continued for a period T3a in step S52.

Then, in step S53, the rotor position is detected, and in step S54, the rotor position is compared with the previously detected rotor position stored in the memory. If they match, the normal rotation flag is set to 0 and the reverse rotation flag is set to 1 in step S55, and steps S1 and S2 in FIG.
Make a judgment. On the other hand, if the rotor positions do not match in step S54, the rotor position (contents of the memory) detected in step S56 is updated, and the process returns to step S49.
A brake period T2a (T2b in FIG. 13) and a free period T3a (T3b in FIG. 13) are provided. Thereafter, the process is repeated until the rotor completely stops.

It should be noted that when the mode is shifted from the reverse rotation sequence (not shown) to the stop mode, steps S42 to S54,
The process of S56 is performed as it is, and at the end of the stop mode, the normal rotation flag is set to 1 and the reverse rotation flag is set to 0. In this embodiment, the brake is applied in the same manner as in the first embodiment. However, the same effect can be obtained by applying the brake in the second or third embodiment.

As described above, in the present embodiment, the rotor is completely stopped in the stop mode, and then the mode shifts to the next rotation mode. And a step-out phenomenon are prevented.

<Fifth Embodiment> A fifth embodiment of the present invention will be described. In the present embodiment, the braking amount is controlled by the rotation speed of the motor 21 to optimize the braking time. The other parts are the same as those in the first embodiment, and the description thereof will not be repeated.

As shown in FIG. 15, when the mode is shifted from the normal rotation mode to the stop mode, first, a free period K1 for turning off all the upper arm and the lower arm is provided. The period K1 is, for example, about 0.1 to 0.5 millisecond, and is uniquely determined in the washing process. Then, at the end point t1 of the period K1, the rotation speed of the motor 21 (see FIG. 3) is detected by the rotor position detection circuit 43, a rotation speed detection circuit (not shown), or the like. The next braking period K2 is determined based on the rotation speed. When the rotation speed of the motor 21 is high, FIG.
As shown in FIG. 15A, the period K2 is made longer, and conversely, when the rotation speed is slower, the length of the period K2 is made shorter as shown in FIG.

Then, the upper arm and the lower arm are turned off to provide a free period K3, and the tension applied to the belt 23 (see FIG. 1) is reduced. Then, the mode shifts to the next reverse rotation mode. Specifically, the characteristics of the rotation speed and the time until the motor 21 is stopped by the brake are experimentally obtained, and a period K2 during which the motor 21 can be stopped according to the rotation speed is provided.

FIG. 16 shows a flowchart of the processing for performing the above operation. In this figure, only the processing part in the case of shifting from the rotation mode by the normal rotation sequence to the stop mode is shown.

The normal rotation sequence in step S60 is continued until it is determined in step S61 that it is the end point. When the normal rotation sequence (S60) ends, the upper arm and the lower arm are all turned off in step S62, and the switching pattern is continued for a period K1 in step S63. Next, in step S64, the rotation speed of the motor 21 is detected. Based on this detection result, the time of the period K2 for applying the brake is determined in step S65 as described above. Then, in step S66, the upper arm is turned off, the lower arm is turned on, and the brake is applied. In step S67, the brake period is set to K2.

Next, in step S68, the upper arm and the lower arm are all turned off, and this switching pattern is changed to step S68.
At 69, the period K3 continues. Then, the rotor position is detected in step S70. Last step S7 of the stop mode
At 1, the normal rotation flag is set to 0, and the reverse rotation flag is set to 1. The subsequent processing, the case where the mode is shifted from the reverse rotation sequence to the stop mode, and the like are as described in the above-described embodiment.

As described above, according to the present embodiment,
Since the brake period K2 is provided so that the rotor can be completely stopped regardless of whether the rotation speed is high or low, no extra brake is applied. If the accuracy of rotation speed detection is high, the brake period K2 may not be determined at the end point t1 of the period K1, the rotation speed may be detected at any time, and the brake period may be continued until the rotation speed becomes zero. . In addition, regarding the method of the brake,
Alternatively, the method described in the third embodiment may be used.

<Sixth Embodiment> A sixth embodiment of the present invention will be described. The difference between the present embodiment and the fifth embodiment is that the regenerative current of the motor 21 is detected instead of detecting the rotation speed of the motor 21 in order to determine the length of the brake period K2 (see FIG. 15). Is what you do. The rest is the same as in the fifth embodiment, and a description thereof will be omitted. Since the regenerative current has a property of increasing as the rotational speed of the motor increases, the sub-control unit 33 (see FIG. 3) determines the time of the brake period K2 based on the magnitude of the regenerative current. As in the present embodiment, an appropriate braking period K2 can be determined by detecting the regenerative current.

<Seventh Embodiment> A seventh embodiment of the present invention will be described. In the present embodiment, the fifth or sixth
As in the embodiment, the length of the brake period K2 is determined during the stop mode. However, the current of the motor 21 (see FIG. 3) immediately before shifting from the rotation mode to the stop mode is detected and the brake period K2 is determined. Is determined.

FIG. 17 shows a flowchart of the processing for performing the above operation. In this figure, only the processing part in the case of shifting from the rotation mode by the normal rotation sequence to the stop mode is shown.

[0117] The normal rotation sequence of step S75 is continued until it is determined to end in step S76. When the normal rotation sequence (S75) ends, the motor current is detected in step S77 before the motor is set in the free state. Then, in step S78, the time of the brake period K2 is determined. Then, the upper arm and the lower arm are all turned off in step S79, and the switching pattern is continued for a period K1 in step S80. Next, in step S81, the upper arm is turned off, the lower arm is turned on, and the brake is applied.
In step S82, the brake period is set to K2.

Next, in step S83, the upper arm and the lower arm are all turned off, and this switching pattern is changed to step S83.
At 84, the period K3 is continued. Then, the rotor position is detected in step S85. Step S8 at the end of the stop mode
In step 6, the normal rotation flag is set to 0, and the reverse rotation flag is set to 1. The subsequent processing and the case where the mode is shifted from the reverse rotation sequence to the stop mode are the same as the processing described in the above embodiment, and the description of the other parts is omitted.

<Eighth Embodiment> An eighth embodiment of the present invention will be described. In the present embodiment, the speed of the motor is detected before and after the free period K1 of the motor provided at the beginning of the transition to the stop mode, and the brake period K2 is determined from the state where the rotation speed decreases.

FIG. 18 shows a flowchart of the processing of this embodiment. In this figure, only the processing part in the case of shifting from the rotation mode by the normal rotation sequence to the stop mode is shown.

The normal rotation sequence in step S91 is continued until it is determined in step S92 that the rotation is completed. When the normal rotation sequence (S91) is completed, the upper arm and the lower arm are all turned off in step S92. At this time, in step S94, the rotation speed (N1) of the motor is detected by the rotor position detection circuit 43, a rotation speed detection circuit (not shown), or the like. Then, change the switching pattern to step S
At 95, the period K1 is continued. Next, in step S96, the rotation speed (N2) of the motor 21 is detected.

Then, in a step S97, the acceleration α is calculated. α = (N1−N2) / t0. Where t0
Is a time interval when two motor rotation speeds are detected as shown in FIG. In step S98, the length of the brake period K2 is determined based on the acceleration α. If the acceleration α is large, the braking effect is strong even in the free state of the motor, so that the motor can be completely stopped even if the braking period K2 is reduced. Conversely, if the acceleration α is small, the brake period K2 is made longer.

Then, in step S99, the upper arm is turned off, the lower arm is turned on, and the brake is applied. Step S
At 100, a brake period K2 is provided. Although the subsequent processing is not shown, a free period K3 is provided as in the above-described embodiment. Similar processing is performed on the reverse rotation sequence side. The other parts are the same as those in the above-described embodiment, and the description thereof will not be repeated.

As described above, according to the present embodiment,
The brake period K2 is determined by calculating the acceleration α in the free period K1. That is, the inertia of the rotor is required. Therefore, even if the degree of application of the electric brake changes due to an external condition or the like, it is possible to appropriately apply the brake in response thereto.

[0125]

【The invention's effect】

<Effect of Claim 1> As described above, according to the present invention, a period for turning off the switching element is provided before and after the braking operation, and in this period, the electric brake is released. At this time, the tension applied to the belt or the like of the transmission device is removed. Thereby, occurrence of a start failure is prevented. In particular, in the case of a DC brushless motor, the occurrence of a step-out phenomenon is prevented because the rotor position can be detected well.

<Effect of Claim 2> By turning off all the upper arms and turning on all the lower arms, a higher braking effect can be obtained as compared with a case where some switching elements are turned on.

<Effect of Claim 3> Conversely, the maximum braking effect can be obtained by turning off all the lower arms and turning on the upper arms.

<Effect of Claim 4> By turning off the upper arm and the lower arm and turning on the switching element provided on the brake arm, a regenerative current flows through the brake arm and is provided on the brake arm. Since the current is attenuated by the resistance, the brake is applied.

<Effect of Claim 5> In the state where the brake is applied, tension is applied to the belt or the like, and even if the motor is started as it is, the rotor position is shifted at the time of starting, which may cause a start failure. However, according to the present invention, after the brake is released, the brake is released to remove the tension and the like, and the rotor is completely stopped before shifting to the rotation mode, so that start-up failure and step-out phenomenon do not occur. become.

<Effect of Claim 6> For example, since an appropriate brake time is set based on the rotation speed at the time of shifting to the stop mode, the brake time is optimized.

<Effect of Claim 7> The acceleration in the free period of the motor provided at the time of shifting to the stop mode is calculated, and the braking time until the complete stop is determined based on the acceleration to perform the braking. Time can be optimized.

<Effect of Claim 8> The current flowing through the motor at the time of shifting to the stop mode is detected, and the braking time is determined based on the current value. Is provided, so that the braking time is optimized.

<Effect of Claim 9> Since the rotation speed can be obtained also by the regenerative current of the motor, an appropriate braking time can be determined, and the braking period can be shortened.

<Effect of Claim 10> Even when the rotation of the motor is transmitted via the belt, the tension applied to the belt at the time of braking is removed, and the rotor position can be detected well. Is prevented.

<Effect of Claim 11> One power supply circuit is provided for the drive circuit on the lower arm side, and power is supplied from this power supply circuit to the drive circuit on the upper arm side by a bootstrap type circuit. , There is only one power supply circuit for supplying power to the drive circuit. Therefore, the number of parts is reduced, and the reliability of the device is improved. Also, there is an effect of cost reduction.

<Effect of Claim 12> With one power supply circuit,
Since the power supply voltage can be supplied to the control circuit and the six drive circuits, the number of power supply circuits in the inverter type washing machine is reduced, and further, there is an effect of improving reliability and reducing costs.

<Effect of Claim 13> Since the level shift is performed in the high breakdown voltage IC, components such as a photocoupler are not required.

<Effect of Claim 14> Since the capacitor of the bootstrap circuit is charged by the braking operation of the washing machine, the power is reliably supplied to the drive circuit at the time of transition to the rotation mode.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an entire washing machine according to a first embodiment of the present invention.

FIG. 2 is a block diagram thereof.

FIG. 3 is a circuit diagram of the inverter device.

FIG. 4 is a diagram showing a flow of a charging current of the capacitor 51a.

FIG. 5 is a block diagram when the driving circuit has an HVIC configuration.

FIG. 6 is a waveform chart for explaining the operation.

FIG. 7 is a flowchart of the process.

FIG. 8 is a diagram showing a flow of a regenerative current during the braking period.

FIG. 9 is a flowchart of processing of the washing machine according to the second embodiment of the present invention.

FIG. 10 is a diagram showing a flow of a regenerative current during the braking period.

FIG. 11 is a diagram showing a flow of a regenerative current during a braking period of the washing machine according to the third embodiment of the present invention.

FIG. 12 is a diagram showing a flow of a regenerative current during the braking period.

FIG. 13 is a waveform chart for explaining an operation according to the fourth embodiment of the present invention.

FIG. 14 is a flowchart of the process.

FIG. 15 is a waveform chart for explaining the operation in the fifth embodiment of the present invention.

FIG. 16 is a flowchart of the process.

FIG. 17 is a waveform chart for explaining an operation in the seventh embodiment of the present invention.

FIG. 18 is a waveform chart for explaining an operation in the eighth embodiment of the present invention.

FIG. 19 is a waveform chart for explaining the operation.

FIG. 20 is a circuit diagram of a conventional inverter device.

FIG. 21 is a waveform chart for explaining the operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Washing machine 11a Lid 12 Dehydration tub 15 Pulsator 21 Motor 24 Operation part 25 Display part 27 Lid sensor 31 Main control part 32 Drive part 33 Sub-control part 41 Inverter circuit 43 Rotor position detection circuit

Claims (14)

[Claims] 1. A motor capable of applying an electric brake, an idle transmission device for transmitting the rotation of the motor, and an upper arm and a lower arm connected to supply a driving current to each phase of the motor. In the inverter device comprising a switching element, a rotation mode for rotating the motor, and a stop mode having a period for applying the electric brake, in the stop mode before and after the period for applying the electric brake to the motor, respectively A period during which the switching element is turned off. 2. The inverter according to claim 1, wherein the electric brake is performed by turning off all switching elements of the upper arm and turning on all switching elements of the lower arm. apparatus. 3. The inverter according to claim 1, wherein the electric brake is performed by turning on all switching elements of the upper arm and turning off all switching elements of the lower arm. apparatus. 4. A brake arm comprising a resistor and a switching element is connected to both ends of the upper arm and the lower arm, and the electric brake turns off all the switching elements of the upper arm and the lower arm, and The inverter device according to claim 1, wherein the switching is performed by turning on a switching element of a brake arm. 5. In the stop mode, the motor position is detected after the electric brake is applied for a certain time, and the rotor position is detected before and after the certain time. The inverter device according to any one of claims 1 to 4, wherein the electric brake is further applied for a predetermined time until the rotor positions match. 6. A means for detecting a rotation speed of the motor, wherein a period is provided for turning off all the switching elements immediately after shifting from the rotation mode to the stop mode, and the rotation of the motor after the lapse of the period is provided. The inverter device according to any one of claims 1 to 4, wherein a time for applying the electric brake is determined based on a speed. 7. Immediately after shifting from the rotation mode to the stop mode, a period for turning off all the switching elements is provided, and before and after the start of the period, the rotation speed of each of the motors is detected. The inverter device according to claim 6, wherein an acceleration is calculated from a speed, and a time for applying the electric brake is determined based on the acceleration. 8. The motor according to claim 1, wherein when the mode is shifted from the rotation mode to the stop mode, a current of the motor is detected, and a time for applying the electric brake is determined based on the current. Item 5. The inverter device according to any one of Items 4. 9. The inverter device according to claim 1, wherein a time for applying the electric brake is determined based on a regenerative current of the motor in the stop mode. 10. The inverter device according to claim 1, wherein the transmission device transmits the rotation of the motor via a belt. 11. A washing machine having an inverter device for driving a three-phase motor, comprising: a switching element connected to an upper arm and a lower arm for supplying a drive current to each phase of the three-phase motor;
A drive circuit for driving each of the switching elements;
A power supply circuit for applying power to each of the drive circuits of the lower arm, and a bootstrap type power supply circuit for charging each of the drive circuits of the upper arm via a diode from the power supply circuit via a diode. A washing machine comprising: 12. The washing machine according to claim 11, further comprising a control circuit for outputting a drive signal to each of the drive circuits, wherein the power supply circuit supplies power to the control circuit. 13. A washing machine having an inverter device for driving a three-phase motor, comprising: a switching element connected to an upper arm and a lower arm for supplying a drive current to each phase of the three-phase motor;
A drive circuit for driving each of the switching elements;
A power supply circuit that applies power to each drive circuit of the lower arm, and a bootstrap type power supply circuit that charges a capacitor via a diode from the power supply circuit to each drive circuit of the upper arm, A control circuit for outputting a drive signal to each of the drive circuits, wherein the drive circuit is a high-withstand-voltage IC, and the high-withstand-voltage IC has a level for level-shifting the drive signal to a reference potential of each of the drive circuits of the upper arm; The washing machine according to claim 11, further comprising a shift circuit. 14. The washing machine according to claim 11, wherein the inverter device is the inverter device according to any one of claims 1 to 10.