JP2001046778A - Electric washer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently conduct washing by effectively utilizing characteristics of a drive motor. SOLUTION: Power of a main microcomputer 17a is supplied, and power of a brushless motor 51 is supplied by action of the microcomputer 17a. Especially, a commercial AC voltage is rectified or boosted by a DC voltage generating circuit 29a to be fed to a three-phase inverter circuit 29b, and after the microcomputer 17a is started, power is supplied to the DC voltage generating circuit 29a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an electric washing machine.

[0002]

2. Description of the Related Art An electric washing machine generally includes a washing tub and a dewatering tub rotatably installed in an outer tub, a stirring blade rotatably installed at the bottom of the washing tub and dehydration tub, and a washing machine. An electric drive device for rotating and driving the tub / dewatering tub and the stirring blades is provided, and the laundry in the washing tub / dewatering tub is selectively driven by the electric drive device to rotate the washing tub / dehydration tub and the stirring blades. The washing step and the rinsing step are performed by stirring, and then the washing / dehydrating tub is rotated at a high speed to centrifugally dehydrate the laundry.

[0003] The electric drive device generally uses an induction motor as a power source. Recently, an electric drive device having a configuration in which an electric power is supplied to the electric motor by an inverter circuit has been proposed. Also, there has been proposed an electric washing machine which can realize various washing and dehydrating operations by using a brushless electric motor as the electric motor. An inverter-controlled washing machine is disclosed, for example, in Japanese Patent Application Laid-Open No. 9-121584. The washing machine is generally controlled by a microcomputer.

[0004]

The control of electric washing machines is becoming increasingly sophisticated, and the control circuits are becoming more complicated. When the power of the washing machine is connected, the microcomputer is started up, and power is also supplied to the control circuit. Various measures have been taken to suppress the power consumption of the washing machine, but the temporary resistance value at the start of power supply is low. In such a situation, it is necessary to operate the microcomputer accurately and maintain the reliability of the control of the washing machine.

One object of the present invention is to propose a highly reliable electric washing machine.

Other objects will be described in the following description of embodiments.

[0007]

SUMMARY OF THE INVENTION In the present invention, brake control is performed while suppressing the voltage on the power supply side of the motor. Specific solutions will be described in the following embodiments.

[0008]

Embodiments of the present invention will be described.
FIG. 1 is a vertical sectional side view of a washing machine showing one embodiment of the present invention. In this embodiment, a basic configuration of a fully automatic washing machine is shown as an example of the washing machine.

Reference numeral 1 denotes an outer frame of the washing machine, which is a frame of the washing machine that includes the periphery of the internal mechanism. Reference numeral 2 denotes a washing tub provided inside the outer frame of the washing machine, specifically, a washing tub and a dewatering tub. A fluid balancer 3 is provided at the upper edge of the washing tub (or the washing / dewatering tub). A stirring blade 4 is rotatably provided inside the bottom of the washing tub (or washing / dehydrating tub) 2. Reference numeral 5 denotes an outer tub, in which a washing tub (or a washing tub and a dewatering tub) 2 is rotatably provided. An electric driving device 6 having a motor (electric motor) is attached to the outside of the bottom of the outer tub 5 by a steel-plated mounting base 7, and is suspended from four corners at the upper end of the outer frame 1 by an anti-vibration support device 8. The internal configuration of the electric drive device 6 will be described later.

The upper cover 9 provided with the clothes input opening 9a is provided on the washing tub (or washing tub and dewatering tub) 2. The upper cover 9 is fitted to the opening edge so as to cover the upper opening of the frame 1, and is attached to the frame 1 together with the front panel 10 and the back panel 11 by mounting screws (not shown).

In front of the upper cover 9, a front panel 10
The front panel box 12 formed below the power switch 13 includes a power switch 13 and an input switch group 1 as an operation switch.
4, a display element group 15, a water level sensor 16 for generating a water level signal according to the water level in the outer tank 5, and a first control device 17 as a main control device. Although not shown, the input switch group 14 sets a degree of dirt on the laundry (more dirt, standard dirt, less dirt), a switch for setting dry mark clothing washing, and a futon washing. Switch and a start switch. In addition, a switch for selecting the strength of the water flow for washing or rinsing is provided, and a switch for indicating the cloth quality is provided.

A back panel box 18 formed below the back panel 11 behind the upper cover 9 is provided. The back panel box 18 incorporates a water supply solenoid valve 21 that connects the water inlet side to the faucet 19 and connects the water outlet side to the water inlet 20. The water injection port 20 is formed so as to discharge water toward an opening of the washing tub (or washing tub and dehydration tub) 2. The back panel box 18 is further provided with a pump for supplying water such as bath water to the washing tub (or washing tub and dewatering tub) 2 via a pump. Water from the water supply solenoid valve 21 is guided to the water inlet 20 through a filter for removing metal ions. The clothing input opening 9 a formed in the upper cover 9 is configured to be openably and closably covered by a lid 22.

A drain port 5 a formed at the bottom of the outer tub 5 is connected to a drain hose 24 via a drain solenoid valve 23. An air trap 5b is provided below the outer tank 5, and the air trap 5b is connected to the water level sensor 16 via an air tube 25. The water level sensor 16 detects the water level by the above configuration, and inputs a signal representing the water level to the first control device 17.

A synthetic resin base 27 having legs 26 attached to the four corners is mounted below the frame 1. The electric driving device 6 is covered with a cover 28 to be waterproof. The electric driving device 6 includes a driving motor, that is, a motor. In the present embodiment, a brushless motor having excellent controllability is provided. The power supply to the motor is performed by a second control device 29 which is an auxiliary control device having a built-in inverter circuit. A second control device 29 described below is configured to supply power to the motor from a built-in inverter circuit in accordance with an instruction from the first control device 17. First
Of the washing tub (or washing tub and dehydration tub) 2
And the electric drive device 6.

On the other hand, the second control device 29 is provided below the washing tub (or washing tub and dewatering tub) 2. With such a configuration, protection from water and safety from high voltage can be ensured. That is, the first control device 17 is provided with a microcomputer for performing control, and is provided on the washing tub (or washing tub and dewatering tub) 2 which is easily protected from water. Further, the second control device 29 has a DC voltage generating circuit for supplying a high voltage, and is therefore arranged below the washing tub (or washing tub and dewatering tub) 2 far from a person's position. In this embodiment, the base 27 made of synthetic resin is used.
It is installed on the top, further improving safety.

FIG. 2 is a longitudinal sectional side view showing a specific structure of the fully automatic washing machine, and a part of the structure is expanded. Since this fully automatic washing machine has basically the same configuration as the fully automatic washing machine shown in FIG. 1, the same reference numerals as those corresponding to the components of the fully automatic washing machine shown in FIG. The same reference numerals are given and duplicate description is omitted. Electric drive 6
Incorporates a brushless motor 51 as a drive power source.

FIG. 3 shows the electric driving device 6 shown in FIG. 1 and FIG.
It is a vertical side view which shows the internal structure of. 4 and 5 are side views in which a part of FIG. 3 is enlarged. The electric drive device 6 includes a reduction gear mechanism, a meshing clutch mechanism 47, and a reversible rotation type brushless electric motor 51 concentrically arranged in a vertical direction about the drive rotation axis of the washing / dewatering tub 2 and the stirring blade 4 as an axis. It is the structure arranged in.

The reduction gear mechanism is driven by a double inner / outer structure by means of ball bearings 33a, 33b inside a split reduction mechanism outer case 32a, 32b mounted on the mounting base 7 with the connecting flange together with the connecting flange. The shaft system 34 is supported. This drive rotating shaft system 34
Comprises a hollow outer rotating shaft system and an inner rotating shaft system disposed inside the hollow.

The outer rotating shaft system is a rotating shaft system that transmits the rotation of the electric motor directly to the washing tub / dewatering tub 2 to drive the washing tub / dewatering tub 2. The outer rotating shaft system extends in the axial direction from the inside of the ball bearing 33a to the outside of the outer case 32a, penetrates the outer tub 5, and the outer output shaft portion 35a, which is the tip end, is connected to the washing tub and dewatering tub 2 so that To rotate. When the washing tub (or washing tub and dewatering tub) 2 is rotating, the annular gear 35f, the planetary gear 36i, the carrier 36h, and the inner output shaft 36c are simultaneously rotated, and the stirring blade 4 is rotated by the washing tub (or washing tub and dewatering tub). (Water tank) 2 at the same speed. A serration 35b that engages with the meshing clutch mechanism 47 is formed in a cylindrical portion that extends in the lower axial direction outside the outer case 32b. Outer input shaft portion 35d having a flange 35c formed at the inner end of outer case 32b of serration 35b
Is mechanically connected to the gear case 35e. An annular gear 35f is fixed to the inner periphery of the gear case 35e. A plurality of planet gears 36i are provided between the ring gear 35f and the sun gear 36f. Note that the planetary gear 36i forms a reduction mechanism that transmits rotation while reducing the speed together with the ring gear 35f and the sun gear 36f. This reduction mechanism is housed in the gear case 35e.

An inner rotating shaft system provided inside the outer rotating shaft system is a rotating shaft system for reducing the rotation of the electric motor and transmitting the reduced rotation to the stirring blades 4 to drive the stirring blades 4.
A seal 37, metal bearings 38a and 38b, and a grip retaining ring (push nut) 39 are provided in the 35a in a watertight and slip-proof state. The inner rotating shaft system protrudes from the tip of the outer output shaft portion 35a into the washing / dewatering tub 2 and is attached to the outer end where the stirring blade 4 is attached.
Attached by The inner rotation shaft system is the inner output shaft 3
6c, an inner input shaft portion 36g, and a planetary gear 36i. The inner output shaft portion 36c communicates with the inside of the gear case portion 35e from the inside of the outer output shaft portion 35a, and has a structure that is coupled to the above-described planetary gear reduction mechanism. A serration 36b is formed at an inner end portion thereof. . 36g inside input shaft
Is a ball bearing 40 inside the outer input shaft portion 35d.
a, 40b. Outer input shaft 35
36 g of inner input shaft part extending in a cantilever state from the outer end of d
A fitting portion 36d is formed at an outer end portion of the mounting portion 36a to which a rotor of a motor, that is, an electric motor is fixed by a set screw 36e. The inner input shaft portion 36g extending into the gear case portion 35e
A sun gear 36f is formed on the inner end side of the. In the gear case 35e, the planetary gear 36i is configured so that its shaft is supported by a carrier 36h fitted to the serration 36b of the inner output shaft 36c. Planetary gear 36
i rotates while meshing with the gears 35f and 36f, and the planetary gear 36i transmits a rotational force to the carrier 36h. Since the planetary gear 36i rotates while the rotation speed of the gear 36f is reduced, the rotational force is transmitted at a reduced speed.

The ball bearings 40a and 40b are mounted in the outer input shaft portion 35d in a state of being press-fitted into the outer input shaft portion 35d so as to support the inner input shaft portion 36g, which is the shaft of the motor, that is, the rotor of the brushless motor 51, with high accuracy. As described later, the inner input shaft portion 36g supports the rotor of the brushless electric motor 51 in a cantilever state. Therefore, the bearing supporting the inner input shaft portion 36g has a small loss and a large radial direction. Ball bearings 40a and 40b, which are typical rolling bearings suitable for supporting a load, were used. However, it can be replaced with a roller bearing.

The brushless motor 51 includes an outer case 32b.
An insulating member 41 is interposed on the lower end surface of the
Thus, the motor housing 43 attached in an insulated state is opened downward, the stator 52 is fitted from the opening end, and is fixed so as to be sandwiched by the plurality of cut-out projections 43a and the bending claws 43b. The rotor 54 assembled to the stator 52 is fitted to a rotor fitting portion 36d formed on the inner input shaft portion 36g, and is fixed by a lock nut 46 screwed to a set screw 36e.

More specifically, the brushless electric motor 51 according to the present embodiment forms a stator 52 by winding a stator winding 52b around a stator core 52a.
2a is inserted into the motor housing 43 and the projection 4
3a and the folding claw 43b are fixed so as to be sandwiched therebetween. The spacing member 53 compensates for the difference between the axial dimension of the stator core 52a and the dimension between the cut-out projection 43a and the bending claw 43b.

The rotor 54 includes a rotor core (yoke) 54.
A permanent magnet magnetic pole 54b is attached to the outer circumference of the motor shaft a, and the motor rotor fitting portion 36g on the inner input shaft portion 36g is attached by a mounting boss 54c made of insulating resin integrally formed with the permanent magnet magnetic pole 54b.
Attach to d.

Slider 47c of meshing clutch mechanism 47
The mating projections and recesses 54d into which the mating projections 47f are formed are resin-molded integrally with the mounting boss 54c on the upper surface of the mounting boss 54c. Mounting boss 54c
Is formed in such a size that it can be fitted and attached to the motor rotor fitting portion 36d, the rotor iron core 54a is exposed at the inner end side tightening end, and the outer end side tightening end portion is formed. Is embedded with a metal ring 54e.

The rotor mounting boss 54c can also be formed short by using a dedicated inner input shaft having a short motor rotor fitting portion. The permanent magnet magnetic pole 54b is configured to protrude outside the stator winding 52b, and the magnetic pole detecting element 55 is installed so as to face the rotation orbit of the protruding portion. Is configured to be detected. The magnetic pole detection element 55 is attached to the cover 48.

The brushless motor 51 includes a stator winding 52
Since the power supply to each phase of the stator winding 52b is controlled by detecting the relative position of the magnetic pole 54b of the rotor 54 with respect to each phase b, detailed description thereof will be omitted. The dog clutch mechanism 47 connects the outer rotating shaft system 35 to the rotor 5 of the electric motor.
4 by meshing engagement with the outer rotating shaft system 35.
The rotational force of the forward rotation and the reverse rotation of the rotor 54 is transmitted to the outer rotating shaft system 35, or the outer rotating shaft system 35 is prevented from rotating by being disengaged and engaged.

In order to reduce the overall size of the electric driving device 6 in the axial direction, the meshing clutch mechanism 47 includes an annular electromagnetic iron core 47b containing an annular electromagnetic coil 47a inside the motor housing 43 by the mounting screw 42. And is installed so as to surround the outer input shaft portion 35d. A slider 47c made of insulating resin, which is slidably engaged in the axial direction with a serration 35b formed on the outer input shaft portion 35d, is engaged with the meshing uneven portion 54d of the rotor 54 by a coil spring 47d. And the slider 47c is lifted up against the pressing force of the coil spring 47d by the electromagnetic force of the electromagnetic coil 47a to release the meshing and the electromagnetic core 47b.
Adsorb to and stop.

The slider 47c is provided with an iron adsorber 47e that is attracted by the electromagnetic iron core 47b and integrally formed by resin molding. It is formed.

The adsorber 47e of the slider 47c is
A plurality of radial locking grooves 47b1 are formed on the suction surface of the electromagnetic iron core 47b to lock the slider 47c and prevent rotation when the slider 47c is attracted to the slider 7b. A plurality of radial locking projections 47 that fit into the stopping grooves 47b1
e1 is formed. The locking groove 47b1 is formed such that the side wall surface for locking the locking ridge 47e1 widens at an angle of 1 to 2 degrees in the depth direction, and the locking ridge 47e1 contacts the side wall surface of the locking groove 47b1. By forming the contacting side surface so as to widen at an inclination of 1 to 2 degrees in the tip direction, a component force in the retaining direction is generated when meshing and engaging.

The lower end of the motor housing 43 is
8 is fitted and covered. Then, a rotation detecting element (magnetic sensing element) 55 of the rotation detecting sensor is attached to the cover 48,
The rotation detecting element 55 is connected to the permanent magnet 54 of the rotor 54.
b.

In such an electric drive device 6, the mounting base 7 is mounted on the outside of the bottom of the outer tub 5 by the mounting screw 50. The outside of the electric driving device 6 is covered by an outer cover 28 attached together with the electric driving device 6 by the mounting screw 50.

Power is supplied to the brushless motor 51 by PWM (pulse width modulation) control and PAM by the second controller 29 in accordance with an instruction from the first controller 17.
(Pulse voltage modulation) control. PAM (pulse voltage modulation) control will be described later in detail.

FIG. 6 shows a control device of the electric washing machine. This control device comprises a first control device 17 and a second control device 29, and FIG. 6 is a block diagram of a specific internal configuration thereof. In this figure, a power supply switch (operation switch) 13, a first relay, and a second relay, which will be described later in detail with reference to FIG. The power supply circuit described with reference to FIG. 16 is omitted.

A first microcomputer (hereinafter referred to as a main microcomputer) 17a and a second microcomputer (hereinafter referred to as an auxiliary microcomputer) 2
9h constitutes a control circuit, and a DC voltage generation circuit 2
9a generates a first control signal for controlling the value of the DC voltage supplied to the inverter circuit 29b. The terminal voltage of the capacitor c based on the first control signal, that is,
The supply voltage to the inverter circuit 29b is controlled. The control circuit generates a second control signal. The second control signal controls the operation of the inverter circuit 29b and controls the pulse width to the brushless motor 51. The rotation direction (forward rotation and reverse rotation) of the brushless electric motor 51 is also controlled based on the second control signal.

The illustration and description of the low-voltage power supply circuit and the power supply switch 13 for operating the microcomputer and other circuits in the first control device 17 and the second control device 29 are omitted.

The first control device 17 is composed mainly of a main microcomputer 17a, and engages with the water supply solenoid valve 21, the drain solenoid valve 23 and the electromagnetic coil of the clutch mechanism 47.
The power supply circuit includes drive circuits 17b to 17d composed of semiconductor AC switching elements (FLS) for controlling power supply to the power supply circuit 47a, and a line filter 17e for preventing high frequency noise from leaking to the commercial power supply circuit.

Then, the main microcomputer 17a
Captures input signals from the input switch group 14 and the water level sensor 16 according to a control processing program incorporated in advance, communicates with the second control device 29, and displays the display element group 1
5, the drive circuits 17b to 17d, and the DC voltage control circuit 29c for controlling the charging of the capacitor, that is, the terminal voltage of the capacitor, and the inverter circuit 29b for supplying power to the brushless motor 51.

The second control device 29 includes a DC voltage generation circuit 29a and a three-phase inverter circuit 29b, and controls power supply to the brushless motor 51. That is, the magnitude and time of the pulse voltage or current supplied to the brushless motor 51 are controlled. The magnitude is a voltage value or a current value. In this embodiment, a voltage is applied, which supplies a current to the brushless motor 51. The voltage is based on the voltage supplied from the capacitor c to the inverter circuit 29b, and the pulse width, that is, the time during which the voltage is applied, is controlled by a second signal applied to the inverter circuit 29b via the inverter drive circuit 29g. The DC voltage supplied to the inverter circuit 29b is controlled by a first control signal from the auxiliary microcomputer 29h. A specific circuit for controlling the DC voltage by the first control signal is as follows:
It includes a DC voltage control circuit 29c, an output voltage feedback resistor 29d, and a voltage control resistor 29e.

The DC voltage generating circuit 29a is connected to the outlet 1
A full-wave rectifier diode bridge DB is provided, which is a rectifier circuit that rectifies the commercial AC power from 502 and outputs a DC voltage. This DC voltage generation circuit 29a has a built-in step-up converter circuit, which is a type of a switching regulator, which functions as a charging circuit for a capacitor c. Is turned off, the voltage is converted to a voltage, and the voltage is superimposed on the input voltage to supply a boosted voltage to the capacitor C and store the charge. Note that the diode D1 stabilizes the DC output voltage by preventing reverse flow of the charge stored in the capacitor C. The boosting amount changes depending on the ON time ratio of the switching element S1 to the ON / OFF cycle. The DC voltage obtained by full-wave rectification by the full-wave rectification diode bridge DB is about 140V. The DC voltage generation circuit 29a variably controls the full-wave rectified voltage in an output voltage range up to about 300 V and outputs the rectified voltage. As the switching element S1, I
A semiconductor element having a function of turning off by itself, such as GBT or GTO, is preferable.

A DC voltage control circuit 29c for controlling the DC voltage generation circuit 29a refers to a detection voltage which divides an output voltage of the DC voltage generation circuit 29a by an output voltage feedback resistor 29d and a voltage control resistor 29e and feeds back. The on / off time ratio of the switching element S1 is controlled so that this detection voltage becomes a predetermined value. In this embodiment, the predetermined value of the detection voltage is a value corresponding to the detection voltage obtained at a predetermined output voltage (155 V in this embodiment). Auxiliary microcomputer 2
The lowest supply voltage to the inverter circuit 29b controlled by the second control signal from 9h is about 155V in this embodiment. Considering soft washing etc., 1
It is desirable that about 40V to 170V can be supplied as the minimum supply voltage.

The three-phase inverter circuit 29b includes a switching element S2 and an anti-parallel diode D2.
The brushless motor 51 includes a phase bridge circuit, and supplies an electric power to a three-phase stator winding 52b of the brushless electric motor 51 using an output voltage of the DC voltage generation circuit 29a as an input. As the switching element S2, a semiconductor element having a function of turning off by itself, such as an IGBT or a GTO, is preferable. The power is supplied from the three-phase inverter circuit 29b to the inverter drive circuit 29g under the control of the auxiliary microcomputer 29h.
This is performed by turning on / off the switching element S2. In order to operate the brushless motor 51 quietly and efficiently, sine wave power supply is preferable. The three-phase inverter circuit 29g realizes sine wave power supply by sine wave PWM control, and suppresses generation of overload current by voltage suppression PWM control.

The sine-wave PWM control includes a V-constant sine-wave PWM control method for keeping the effective value of the output voltage V constant, and a V / F constant sine-wave P for keeping the relationship between the output voltage V and the frequency F constant.
There is a WM control method. V constant sine wave PWM control method is 3
Power supply can be realized by making maximum use of the input voltage of the phase inverter circuit 29b. According to the constant V / F sine wave PWM control method, efficient power supply to the brushless motor 51 can be realized.

FIG. 7 exemplifies a waveform diagram of V / F constant control by sine wave PWM control. In order to make V / F constant, a sine wave and a triangular wave are compared as shown in FIG.
By using a pulse waveform train as shown in (b) obtained when the peak value of the sine wave is changed with reference to the triangular wave for the on / off control of the switching element S2 of the three-phase inverter circuit 29g, the sine wave is obtained. A wave approximation PWM control method can be realized.

The triangular wave is transmitted to the auxiliary microcomputer 29h.
Integrated timer pulse unit (I
TU), and a sine wave is created as internal data of the auxiliary microcomputer 29h. The internal data of the sine wave for each frequency is not calculated every time in order to increase the carrier frequency of the triangular wave (for example, 16 KHz), but the result calculated for each frequency is stored in a table in advance and used. To

The V-constant sine wave PWM control maximizes the input voltage by setting the magnitude of the sine wave to be compared with the triangular wave to a constant value such that the maximum output voltage can be obtained with respect to the input voltage. The sine wave power supply that is used can be realized.

In FIG. 6, the auxiliary microcomputer 29h
Supplies power to the corresponding stator winding 52b by referring to the rotation position signal of the rotor 54 output from the position detection circuit 29f based on the detection signal from the magnetic pole detection element 55 in accordance with an instruction from the main microcomputer 17a. In this manner, the inverter driving circuit 29g is controlled so as to control the voltage control resistor 29e to change the DC output voltage of the DC voltage generating circuit 29a. The current flowing through the winding of the motor 51 is detected by the current detection circuit 205.

As described above, DC voltage control circuit 29c controls DC voltage generation circuit 29a so that the detected voltage becomes a predetermined value (corresponding to 155 V of the output voltage). Then, at a predetermined output voltage (155 V), the voltage control resistor 29e
Circuit constants are set so that the detection voltage when all of the control terminals are in the open state has a predetermined value. Accordingly, the auxiliary microcomputer 29h opens all control terminals of the voltage control resistor 29e, so that the DC voltage control circuit 29c controls the DC voltage variable circuit 29c so as to obtain a predetermined output voltage (155 V). I do. And
When increasing the output voltage, the auxiliary microcomputer 29h short-circuits (connects) an arbitrary control terminal of the voltage control resistor 29g to thereby control the DC voltage control circuit 29c.
The detection voltage that is fed back to is reduced. This way,
The DC voltage control circuit 29c controls the DC voltage generation circuit 29a to increase the lowered detection voltage to a predetermined detection voltage.
Is executed to increase the output voltage. In this embodiment, the output voltage of the DC voltage generation circuit 29a is multi-stage (for example, 155V, 185V, 190V, 210V) by opening and closing the control terminal of the voltage control resistor 29e.
V, 230 V, 270 V). In this embodiment, the first control signal is represented by which of the voltage control resistors 29e is opened. That is, it is provided as a bias voltage of the DC voltage control circuit 29c. Instead, a method of generating the first control signal as a digital signal may be used. Finally, the ON / OFF time (or duty) of the semiconductor switch S1 is controlled so that a desired voltage appears between the terminals of the capacitor C.

When the main microcomputer 17a is instructed to start washing by the input switch group 14, the main microcomputer 17a manually or automatically sets the washing mode and the dehydration mode based on the instruction input from the input switch group 14, and sets the set washing mode. Mode and dehydration mode. The washing mode is, for example, a detection step, a washing step, and a rinsing step as shown in FIG. The dehydration mode is a dehydration step.

FIG. 8 shows a control process executed by the main microcomputer 17a in the basic washing / dewatering mode.

Step 801 (Detection of Cloth Quantity or Cloth) Detection of the cloth quantity or cloth quality is performed. The result of this detection is
It is used for setting the amount of washing water supplied and various conditions in the washing mode and the dehydration mode. First, when the laundry put into the washing / dewatering tub 2 is in a dry state before being supplied with water, power is supplied to the brushless electric motor 51 to rotate the stirring blades 4, and the cloth is dried based on the load resistance at that time. The cloth amount is detected (s1 in FIG. 9). The detection of the load resistance is performed by detecting the rotation speed when the rotation speed of the brushless electric motor 51 becomes stable. When the amount of cloth is large, the load resistance increases and the rotation speed decreases, so the relationship between the rotation speed and the load resistance (dry cloth amount) is determined in advance, and the dry cloth amount is detected from the rotation speed at this time. can do. In this embodiment, the detection result of the dry cloth amount is used to determine the supply amount of the washing water.

Next, the electromagnetic water supply valve 21 is opened to supply water to the washing / dewatering tub 2 (outer tub 5) to a predetermined water level. The predetermined water level is a low water level for moistening the laundry.
Then, power is supplied to the brushless motor 51 again, and
Is rotated, and the first wet cloth amount is detected based on the load resistance value at that time (s2 in FIG. 9). After that, the water level is raised by supplying water, the power is again supplied to the brushless electric motor 51, and the stirring blade 4 is rotated, and the second wet cloth amount is detected based on the load resistance value at that time (s3 in FIG. 9). The water level detection at this time is performed by monitoring a water level detection signal output from the water level sensor 16.

The cloth quality is detected based on the difference between the first wet cloth amount detection result and the second wet cloth amount detection result, and is used to determine the conditions in the washing and dehydrating modes. The DC output voltage of the DC voltage generation circuit 29a when supplying power to the brushless motor 51 to rotate the stirring blade 4 in the detection of the cloth amount or the cloth is determined by the DC voltage generation circuit 29.
a minimum output voltage v1 (155 V in this embodiment)
T1 to t2 in FIG. 9). At this time, it is advantageous that the DC output voltage to the inverter circuit 29b is lower in order to increase the detection accuracy.

The causes are as follows.
Urges the electromagnetic coil 47a of the meshing clutch mechanism 47 to electromagnetically attract the adsorber 47e, so that the slider
47c is pulled up against the coil spring 47d to separate the engaging projection 47f of the slider 47c from the engaging concave and convex portion 45c3 of the rotor 45 of the electric motor. Lock groove 47
When the b1 is engaged, the outer rotation shaft system 35 (the washing tub and the dewatering tub 2) is locked so as to suppress the rotation thereof. In this state, power is supplied to the stator coil 52b of the brushless motor 51 to rotate the rotor 54, and after the speed is reduced from the inner input shaft portion 36g via the planetary gear 36i, the inner output shaft portion 36c
To rotate the stirring blade 4.

During the detection operation and until the next washing step (t1
To t2) As shown in FIG. 9 (M), the output voltage of the DC voltage generation circuit 29a is maintained at a predetermined voltage v1. It is preferable to maintain the voltage at or above the minimum voltage v1.

In step 802, the washing water level is determined according to the detected amount of dry cloth, and water is supplied up to the determined washing water level. Step 803, a washing mode (t2 to t3 in FIG. 9) is executed by setting a washing mode according to the cloth quality and the degree of dirt. The washing mode is prepared as a variety of washing mode control programs configured by combining washing intensity (the intensity of stirring with the stirring blade 4 and the washing / dewatering tub 2 and means the intensity of washing water flow) and washing time. Automatically, based on the cloth detection result and the degree of dirt input from the input switch group 14, or based on an instruction input from the input switch group 14, one of which is selected and executed. I do. This also inputs the strength of the washing water flow.

In this embodiment, the washing intensity is classified into strong washing (large washing) A, standard washing B, medium washing (low load washing) C, and weak washing D. Depending on the washing intensity (A1 to D1) for more stains and the standard, and the washing intensity for less stains (A2 to
D2) divided into two types of washing intensity (washing water flow) and a weaker fine washing intensity (washing water flow) category E and a washing tub suitable for washing dry mark clothing and delicate clothing so as not to lose their shape. Washing strength (washing water flow) category F for rotating the dewatering tub 2 forward and reverse, and washing strength (washing water flow) category G for gently rotating the dewatering tub 2 in one direction suitable for washing large items such as futons. Was prepared. Fig. 9
The capacitor voltage v2 is selected. When the water flow is strong, v2 is made higher than when the water flow is weak. Further, as indicated by a broken line, the strength may be temporarily increased to v10 and then decreased to v11. In this way, the strength of the water flow can be reduced,
Further, the torque at the start of rotation can be increased.

In the operation in the washing strength category in which the stirring blade 4 is rotated forward and backward, the electromagnetic coil 47 of the meshing clutch mechanism 47 is operated.
a to lift the slider 47c to raise the slider 47c.
The rotor 47 is disengaged from the rotor 45, the attracting element 47e is attracted to the electromagnetic iron core 47b, and the locking ridge 47e1 is engaged with the locking groove 47b.
1, the outer input shaft 35d is prevented from rotating, the washing / dewatering tub 2 is brought into a stationary state, and power is supplied to the stator coil 52b so as to rotate the rotor 54 in the forward and reverse directions. The power is transmitted to the stirring blade 4 via the inner input shaft 36g, the planetary gear 36i, and the inner output shaft 36c. The power supply from the inverter to the motor 51 is temporarily stopped during the normal rotation and the reverse rotation of the stirring blade 4, but the output voltage of the DC voltage generation circuit 29a is not reduced to zero. It is maintained at v1 or more in FIG. In this embodiment, t2 to t3 are maintained at set values based on the result of the detection process of t1 to t2. This makes it easier to secure the starting torque.

In the washing strength category in which the washing / dehydrating tub 2 is rotated forward and backward, the electromagnetic coil 4 of the meshing clutch mechanism 47 is provided.
The slider 47c is deenergized and the slider 47c is pushed down by the coil spring 47d, and the meshing projection 47f of the slider 47c is fitted into the meshing concave and convex portion 54d of the rotor 54 and meshed to be connected to the rotor 54. By feeding power to the stator coil 52b so as to rotate the rotor 54 forward and reverse,
This rotation is applied to the outer input shaft 35d, the gear case 35e,
The power is transmitted to the washing / dewatering tub 2 via the outer output shaft 35a. At this time, since the planetary gear mechanism loses the speed reduction function,
The stirring blade 4 rotates integrally with the washing / dewatering tub 2 in synchronism. In this case, the efficiency can be improved by setting the voltage of the condenser higher than the operation in the washing intensity section in which the stirring blade 4 is rotated forward and backward. The supply voltage to the brushless motor 51 can be increased, and the current can be supplied even when the rotation speed of the brushless motor 51 increases. The three-phase inverter circuit 29 is provided between the forward rotation and the reverse rotation of the washing / dewatering tub 2.
Although the power supply from b to the brushless motor 51 is temporarily stopped, the output voltage of the DC voltage generation circuit 29a is not reduced to zero. It is maintained at v1 or more in FIG. In this embodiment, t2
T3 is maintained at a set value based on the result of the detection process of t1 to t2. This makes it easier to secure the starting torque.

In the washing strength section where the washing and dewatering tub 2 is continuously rotated in one direction, the brushless motor 51 is fixed so as to be continuously rotated in one direction when the meshing clutch mechanism 47 is engaged. Power is supplied to the child coil 52b. DC voltage generating circuit 29a in this state
Is higher than when the agitating blade 4 rotates in the normal or reverse direction unless there is a large difference in the amount of washing water. In addition, washing tub and dehydration tub 2
Is higher than that in the operation of the washing strength section in which the rotation is performed in the forward and reverse directions.

The washing intensity (washing water flow) changes depending on the output torque of the brushless motor 51 and the rotation time period (power on / off time ratio). The magnitude (large or small) of the output torque of the brushless electric motor 51 depends on the level control of the DC output voltage of the DC voltage generation circuit 29a and the PW of the three-phase inverter circuit 29b.
This can be realized by voltage suppression (peak value) control of the sine wave voltage in the M control. The rotation time period can be controlled by a control program set in advance.

For example, in the heavy washing A1 with a large amount of dirt, the DC output voltage of the DC voltage generation circuit 29a is set to a constant value of 210 V, the three-phase inverter circuit 29b supplies power to the brushless motor 51 (sine wave PWM) and pauses. Time between forward and reverse rotation of 1.4 seconds (forward rotation power supply) /0.9 seconds (pause)
/1.4 seconds (power supply in the reverse rotation direction) /0.9 seconds (pause)... Similarly, in the standard washing B1 with a large amount of dirt, the DC output voltage of the DC voltage generation circuit 29a is set to 230V.
And the power supply to the brushless motor 51 and the pause by the three-phase inverter circuit 29b are repeated at 1.1 seconds (power supply) /0.9 seconds (pause). Also,
In the washing C1 with a large amount of dirt, the DC output voltage of the DC voltage generation circuit 29a is set to a constant value of 190 V, and the power supply to the brushless motor 51 by the three-phase inverter circuit 29b and the pause are set to 0.8 seconds (power supply) / 1. Repeat every 0.0 seconds (pause). Further, in the dirt-rich weak washing D1, the DC output voltage of the DC voltage generating circuit 29a is set to a constant value of 190 V, and the three-phase inverter circuit 29b supplies power to the brushless motor 51 and stops for 0.5 seconds (power supply). /0.7
Repeat every second (pause).

On the other hand, in the strong washing A2 with less contamination, the DC output voltage of the DC voltage generation circuit 29a is reduced to 210V.
, The power is supplied to the brushless motor 51 by the three-phase inverter circuit 29b for 0.3 seconds to start the motor with a large output torque. Subsequently, the DC output voltage of the DC voltage generation circuit 29a is reduced to 185V to 1.1. The power supply for two seconds is executed, the rotation is continued with a small output torque, and then the control for pausing for one second is repeated in the forward and reverse rotation directions. Further, in the standard washing B2 with less dirt, the DC output voltage of the DC voltage generating circuit 29a is set to 210 V, and power is supplied to the brushless motor 51 by the three-phase inverter circuit 29b for 0.3 seconds to start with a large output torque. Then, by adding a voltage limiting PWM control to the sine wave PWM control of the three-phase inverter circuit 29b, power supply is performed for 1.5 seconds so that the peak value of the sine wave voltage supplied to the brushless motor 51 becomes 140V. The control is executed to continue the rotation with the small output torque, and thereafter, the control of pausing for 1.0 second is repeated in the forward and reverse rotation directions. Further, in the low-contamination middle washing C2, the DC output voltage of the DC voltage generation circuit 29a is set to 210 V, and the power is supplied to the brushless motor 51 by the three-phase inverter circuit 29b for 0.3 seconds to start the motor with a large output torque. Then, by adding voltage limiting PWM control to the sine wave PWM control of the three-phase inverter circuit 29b, power supply is performed for 1.5 seconds so that the peak value of the sine wave voltage supplied to the brushless motor 51 becomes 115V. To continue rotation with small output torque,
Thereafter, the control for pausing for 1.0 second is repeated in the forward and reverse rotation directions. And with less dirt less washing D2,
The DC output voltage of the DC voltage generation circuit 29a is set to 210 V, the power is supplied to the brushless motor 51 by the three-phase inverter circuit 29b for 0.3 seconds, the motor is started with a large output torque, and subsequently the three-phase inverter circuit 29b is activated. By adding the voltage limit PWM control to the sine wave PWM control, power supply is performed for 1.5 seconds so that the peak value of the sine wave voltage supplied to the brushless motor 51 becomes 90 V, and rotation with a small output torque is performed. The control that continues and then pauses for 1.0 second is repeated in the forward and reverse rotation directions.

According to the control for lowering the voltage in the course of power supply to the brushless motor 51, the stirring blade 4 is started to rotate with a large torque, and thereafter the stirring force acting on the laundry is reduced. The effect of reducing the damage to the cloth by reducing the size can be obtained.

In the fine washing E, the DC voltage generating circuit 2
The DC output voltage 9a is set to a constant value of 190 V, and the power supply and the pause to the brushless motor 51 by the three-phase inverter circuit 29b are repeated at 0.5 seconds (power supply) /1.0 seconds (pause).

In the washing strength category F in which the washing / dewatering tub 2 is rotated in the normal and reverse directions, for example, the DC voltage generating circuit 29a
Is set to 155 V, and the peak value of the sine wave voltage supplied to the brushless motor 51 is set to 80 V by adding the voltage limit PWM control to the sine wave PWM control by the three-phase inverter circuit 29b. Power supply is performed for 6 seconds to continue gentle rotation with small output torque, then control to pause for 3.0 seconds is repeated in the forward and reverse rotation direction. The rotating washing F2 and the tank rotating washing F3 in which power was supplied for 3 seconds and then stopped for 2 seconds were performed.

In the washing strength category G in which the washing / dewatering tub 2 is continuously rotated in one direction, for example, the DC output voltage of the DC voltage generating circuit 29a is set to 155 V and the sine wave generated by the three-phase inverter circuit 29b is set. By adding the voltage limit PWM control to the wave PWM control, power supply is performed for 6 seconds so that the peak value of the sine wave voltage supplied to the brushless motor 51 becomes 35 V, and the gentle rotation is continued with a small output torque. After that, a tank rotation washing in which the control of pausing for 6.0 seconds was repeated in one direction was prepared.

In the washing mode, seven levels are set for each degree of soiling based on a combination of the degree of soiling and the washing intensity and washing time described above, and one of them is selected and executed. When the automatic selection is instructed by the input switch group 14, the degree of dirt (more dirt, standard, less dirt) and the cloth set based on the instruction input from the input switch group 14 or based on dirt detection Automatic selection is performed based on the detection result, and when manual selection is input from the input switch group 14, manual selection is performed based on the input.

The first washing mode group M1 is a washing mode group for laundry with a large amount of dirt.
Washing mode M11 for 5 minutes, washing mode M12 for 12 minutes in heavy washing A1, washing mode M13 for 12 minutes in standard washing B1, washing mode M14 for 10 minutes in standard washing B1, and 8 minutes for medium washing C1. Wash mode M
15, and a washing mode M16 of washing for 6 minutes with a weak washing D1,
Seven stages of washing mode M17 in which washing was carried out for 6 minutes in the fine washing E were prepared.

The second washing mode group M2 is a washing mode group for washing laundry with standard dirt.
Washing mode M21 for washing for 0 minutes, washing mode M22 for washing for 6 minutes with strong washing A1, washing mode M23 for washing for 6 minutes with standard washing B1, washing mode M24 for washing for 5 minutes with standard washing B1, and washing for 5 minutes with medium washing C1. Washing wash mode M25,
Wash mode M26 for 4 minutes with mild wash D1 and fine wash E
7 steps of washing mode M27 in which washing is performed for 3 minutes.

The third washing mode group M3 is a washing mode group for washing the laundry with less dirt, wherein each washing mode is constituted by combining a plurality of washing intensities. Washing for 1 minute and 30 seconds in the tank rotating wash F2, further washing for 4 minutes in the standard washing B2, and washing mode M31 for washing for 1 minute and 30 seconds in the tank rotating washing F2, and washing for 4 minutes in the strong washing A2, and then rotating the tank. Wash F2 for 1 minute 3
Washing mode M3 for 0 seconds, further washing for 3 minutes in standard washing B2, and washing for 1 minute and 30 seconds in rotating bath F2
2 and 4 minutes in the standard wash B2, and then for 1 minute and 30 seconds in the tumbler wash F2, and then for 3 minutes in the standard wash B2 and 1 minute and 30 seconds in the tumbler wash F2. , Wash for 4 minutes in middle wash C2, then for 1 minute and 30 seconds in tank rotation wash F2, and then for standard wash B2
Washing mode for 3 minutes and washing in the bath F2 for 1 minute and 30 seconds. Washing mode M34, washing in the middle C2 for 4 minutes, then washing in the bath washing F1 for 1 minute and 30 seconds, and further washing in the standard washing B2 for 2 minutes. Washing for 1 minute and then for 1 minute and 30 seconds in the rotating tank F1 and washing for 4 minutes in the mild washing D2, then washing for 1 minute and 30 seconds in the rotating tank F1 and washing for 2 minutes in the weak washing D2 , And washing tank rotating F1
Washing mode 1 minute and 30 seconds with washing mode M36, weak washing D2 for 2 minutes, then washing with rotating tank F1 for 1 minute and 30 seconds, washing with mild washing D2 for 1 minute, and washing with tank rotating F1 for 1 minute Seven stages of washing mode M36 for washing for 30 minutes were prepared.

Since each of these washing modes is a control specification in a washing process using cold water such as tap water,
In the washing step using warm water such as bath remaining water, the washing intensity can be changed to a relatively weak washing intensity and a short washing time.

In such a washing step, the main microcomputer 17a operates the cloth detection result or the input switch group 14
The washing mode is selectively determined according to the set washing mode, and is executed by controlling the DC voltage generating circuit 29a, the three-phase inverter circuit 29b and the meshing clutch mechanism 47 according to the mode control program. The DC voltage generation circuit 29a in the washing process
An example of the supply voltage to b is as shown in FIG.

Step 804, a rinsing step is performed (t3 to t13 in FIG. 9). This rinsing step is preferably performed in combination with the water rinsing operation and the pool rinsing operation. In addition, in order to increase the rinsing efficiency, it is preferable to combine a short-time weak dehydration (rinse dehydration) operation during drainage. Further, it is also effective to use a water injection rinsing operation for promoting the release of dirty washing water by injecting water while rotating the washing / dewatering tub 2 slowly during rinsing.

This rinsing dewatering operation is controlled so that the dewatering power is changed depending on the cloth quality and the degree of dirt. For example, for a large amount of dirt and standard laundry, the spinning speed of the washing tub / spin-drying tub 2 is set to 900 rpm, and the spinning speed and the operation time (total time from the start) are set. Can be changed depending on the fabric. Specifically, a first rinsing and dewatering mode in which operation is performed for 4 minutes so as to start up relatively slowly, a second rinsing and dewatering mode in which operation is performed for 2 minutes and 40 seconds so as to start up relatively quickly, and a medium speed region (200-330 rpm) for a further 2 minutes and 30 seconds to run more steeply, and a fourth rinse and dewatering mode to run for 2 minutes and 20 seconds so that the middle speed range rises more steeply. And low speed range (0-130rpm
) And a fifth rinsing and dewatering mode in which the medium speed region is started up relatively slowly for 3 minutes and 10 seconds, and a 2 minute period in which the medium speed region is started up slowly and the other regions are started up relatively steeply. A sixth rinse dehydration, running for 30 seconds, was provided.

The rinsing and dewatering mode for the laundry with less stains is configured by changing the rotation speed of the washing tub and dewatering tub 2 to a slightly lower speed (about 800 rpm).

Each of these rinsing and dewatering modes is selected and executed in conjunction with each of the washing modes in the washing step.

The control of the start-up characteristic of the rotational speed is performed by controlling the DC output voltage of the DC voltage generating circuit 29a and the three-phase inverter circuit 29b by the auxiliary microcomputer 29h according to the instruction from the main microcomputer 17a. This is realized by changing the output torque of 51. Auxiliary microcomputer 29
h controls the DC voltage generation circuit 29a so as to output a relatively high constant voltage (250 V or higher, 270 V in this embodiment) to enable a high torque output of the brushless motor 561, and The rotation speed feedback control is performed on the three-phase inverter circuit 29b so that the speed rising characteristic becomes the above-described characteristic. Since the washing tub 2 is driven so as to have the same rotation speed as the rotation speed of the brushless motor 51, the rotation speed of the brushless motor 51 is recognized based on the rotation position signal output from the position detection circuit 29f. The brushless motor 5
By performing the speed control of 1, the rotation speed control of the washing / dewatering tub 2 can be realized. It is desirable that the supply voltage from the DC voltage generation circuit 29a to the inverter circuit 29b in the dehydration operation be 200 V or more and be applied at t4. Alternatively, during the dehydration operation, the voltage of the capacitor is maintained at a value higher than the voltage v0, and the brushless motor 51 is controlled by the control of the three-phase inverter circuit 29b.
It is desirable to control the increase characteristic of the rotation speed of the motor. Here, the voltage v0 is v1 which is the lowest capacitor voltage when the DC voltage generation circuit 29a outputs the DC voltage in the rinsing step (t3 to t13 in FIG. 9), and 1 is the highest capacitor voltage in the rinsing step. When v2, v0 = v
1+ (v2−v1) / 2.

Step 805, a dehydration step after the rinsing step, that is, a final dehydration step (t13 to t14) is executed. This dehydration step is controlled so as to change the dehydration power according to the quality of the cloth and the stain, as in the above-described washing step and rinsing step. Dehydration after rinsing greatly affects the generation of wrinkles on the laundry. Therefore, it is desirable to control the dehydration so as to minimize the generation of wrinkles. The dewatering power is determined by the rotation speed and the operation time of the washing / dewatering tub 2.
In this embodiment, a plurality of dehydration modes that can be selectively executed in accordance with the type of fabric are provided in order to enable a dehydration operation with less wrinkling.

In this embodiment, each dehydrating mode is configured by setting the rotation speed of the washing / dewatering tub 2 to 900 rpm and changing the startup method and the operation time (total time from the start).

In the dehydration mode (dehydration mode after the rinsing step), a low-speed region (0 to 130 rpm) is slowly started, and thereafter, the operation is started relatively steeply for 9 minutes.
Dehydration mode, and start up and run for 8 minutes
Dehydration mode, and start up and run for 7 minutes
Dehydration mode, and a fourth dehydration mode in which the low-speed region (0 to 130 rpm) is started up relatively steeply for 6 minutes,
Similarly, a fifth dehydration mode that starts up and operates for 5 minutes,
Similarly, a sixth dehydration mode that starts up and operates for 4 minutes,
Similarly, a seventh dehydration mode for starting up and operating for 3 minutes was prepared.

The rotation speed control in this dehydration mode also
As with the rotation speed control in the rinsing dehydration process described above,
The DC voltage generation circuit 29a is controlled so as to output a relatively high constant voltage (250 V or higher, 270 V in this embodiment) to enable a high torque output of the brushless motor 561, and the rotation speed rises. The three-phase inverter circuit 29 is set so that the characteristics are as described above.
b performs the rotation speed feedback control.

In each of these steps, the main microcomputer 17a displays the set state and the process progress state by controlling the display element group 15, and sounds a buzzer when an abnormality occurs or when washing is completed. To do.

When a relatively strong rotational driving force or a high rotational speed is required to obtain various optimum rotational speed characteristics as described above by a relatively small brushless motor 51, the DC voltage of the DC voltage generation circuit 29a is reduced. The output voltage (terminal voltage of the capacitor C) is increased to maintain a relatively high voltage at a constant value, and when a relatively weak rotation driving force or a low rotation speed is required, the DC output voltage of the DC voltage generation circuit 29a is reduced. The voltage suppression PWM control is executed by the three-phase inverter circuit 29b while maintaining the voltage at a relatively low constant value. In the dehydration operation, the voltage supplied from the DC voltage generation circuit 29a to the inverter circuit 29b, that is, FIG.
It is desirable to set the voltage V6 to 200 V or more at the time of startup. Alternatively, at the time of the dehydration operation in the dehydration step, it is desirable that the voltage of the capacitor is maintained at a value higher than the voltage v0, and that the rotation speed of the brushless motor is controlled to increase by controlling the inverter circuit. Here, the voltage v0 is the lowest capacitor voltage when the DC voltage generating circuit is outputting a DC voltage in the rinsing step or the dehydrating step (t3 to t14 in FIG. 9), and the highest capacitor voltage in the rinsing step. When the voltage is v2, v0 = v
1+ (v2−v1) / 2.

FIG. 9 schematically shows the control characteristics of the DC output voltage (terminal voltage of the capacitor c) of the DC voltage generating circuit 29a which is convenient for such operation control. In the figure, t1 is when the power switch of the washing machine is turned on. From this point, the DC voltage generation circuit 29a starts supplying a predetermined DC voltage. The DC voltage generation circuit 29a keeps supplying a predetermined DC voltage until the power is turned off at t15. This makes it possible to smoothly start each operation. Further, the output of the DC voltage generation circuit 29a can be supplied to other operating devices and driving devices, and can be supplied to a control device.

When the stirring blade 4 is rotationally driven (t1 to t2) to detect the cloth amount or the cloth quality, the capacitor voltage is the minimum voltage v1 (in this embodiment, the voltage control range of the DC voltage generation circuit 29a). (Set to 155V) and maintained at a constant value. Then, the stirring blade 4 is driven to rotate at a relatively low rotation speed n1 three times (dry cloth amount detection s1, first rotation).
S2, second wet cloth amount detection).

In the washing step (t2 to t3), the capacitor voltage is raised to a relatively high voltage v2 and maintained at a constant value. The rotation speed n2 of the stirring blade 4 in this washing process
Is higher than in the detection operation. Then, in order to make various changes according to the cloth quality and the degree of dirt, the values are changed as necessary such as v10 and v11. In this embodiment, the voltage is set to 185V to 230V. The use of such a high voltage facilitates drive control of various stirring intensities.

In the rinsing step, at the time of drainage (t3 to t)
4) When the condenser voltage is returned to the minimum voltage v1 and the washing tub and dewatering tub 2 is rotationally driven to dehydrate the washing water (t)
From 4 to t5), the voltage is raised to the maximum voltage v3 and maintained at a constant value. At this time, the washing / dehydrating tub 2 is set to the high rotation speed n3.
Drive with In order to smoothly control the acceleration of the washing / dehydrating tub 2, the pressure may be increased stepwise through the intermediate voltage v12 as necessary. In this embodiment, the maximum voltage v3 is set to 270V. Such a high voltage is suitable for controlling the drive of the washing / dewatering tub 2 having a large inertia load.

Thereafter, when the water rinsing is performed while rotating the washing / dewatering tub 2 (t6 to t7), the capacitor voltage is maintained at the constant value of the maximum value v4 and the three-phase inverter circuit is operated.
29b controls the washing / dewatering tub 2 and the stirring blade 4 to rotate slowly (n4).

When the stirring blade 4 is rotated slowly (n5, n6) for rinsing (t8 to t10), the capacitor voltage is returned to the minimum voltage v1, and if necessary, the higher voltage v1
Increase the pressure to 3.

In the next dehydration (t11 to t12),
In order to rotate the stirring blade 4 and the washing / dewatering tub 2 at high speed (n7), the voltage is increased to the maximum value v5.

During the period from t12 to t13, the above control is repeated N times.

In the dehydration step after the rinsing step, that is, in the final dehydration step (t13 to t14), the voltage is increased to the maximum value v6 in order to rotate the stirring blade 4 and the washing / dewatering tub 2 at a high speed (n8).

Then, after the end of the final dehydration step (t15), the DC voltage generation circuit 29a stops outputting the DC voltage.

In the above-described embodiment, a brushless motor is used as the drive motor, but other types of motors can be used. Further, the three-phase inverter circuit can be changed to another inverter circuit.

As described above, in this embodiment, the commercial AC voltage is rectified and boosted to supply power to the inverter-driven motor in the electric drive device.
By effectively utilizing the output characteristics of the electric motor, an efficient washing or spin-drying process can be realized with a small electric motor.

Accordingly, it is possible to provide an electric washing machine capable of performing fine washing and dewatering steps in accordance with the amount, quality, type of dirt, etc. of the laundry, and enabling various washing and dehydrating operations. Can be.

FIG. 10 is an explanatory diagram of the vector control of the motor 51 (brushless motor in this figure) as an example during the spin-drying operation of the washing machine. In the figure, the real axis in the complex plane and the imaginary axis in the state of the equivalent circuit of the motor 51 are represented by d-axis and q-axis.
Indicated by the axis. Vi represents a vector of a voltage supplied from the inverter circuit 29b to the motor 51, and its phase is represented by δ.
Indicated by The voltage Vi is an AC voltage shown in FIG. The current Im (vector) indicates a current flowing through the motor 51. The current Im is measured by the resistor 205, for example. E0 is the induced voltage of the motor 51, and the voltage V1 is the induced voltage E0, the voltage vector r · Im of the resistance component r of the motor due to the motor current Im, and the voltage vector ωr · L due to the reactance component of the motor, as can be seen from the drawing. A vector sum relationship with Im is obtained.

In order to efficiently generate the torque of the motor 51, it is desirable that the vector of the current Im be on the q axis.
Therefore, in order to efficiently increase the rotation speed of the dehydrating tub 2 of the washing machine in the dehydrating operation, the voltage Vi and the phase δ of the voltage Vi are controlled so that the vector of the motor current Im is on the q axis. Although the dehydration operation has been described as an example, the torque can be efficiently generated by the rotational driving of the stirring blade 4 and the dehydration tub 2 in other operations by controlling the same concept. Note that ωr is the rotational angular velocity, and the induced voltage E0 increases in proportion to the rotational speed of the motor, that is, ωr.

Next, the deceleration operation will be described by taking as an example the brake control after the washing basin is rotated at a high speed in the dehydration operation.
FIG. 11 is a vector diagram showing an operation state when the motor 51 generates a deceleration force. Here, as the deceleration state, for example, a state in which the dehydration tub 2 is rotating at high speed is considered. Since the dewatering tub 2 with the laundry in it has a large mass, the dewatering tub rotating at high speed has a high kinetic energy.
Rapid deceleration of the dehydration tub requires rapid consumption of the kinetic energy. In the control method described with reference to FIG. 11, the heat is consumed as heat of the motor. Since the washing machine uses water in the first place, if the heat of the motor is released to the periphery of the motor such as the washing machine body, the above heat energy can be easily absorbed,
It does not cause abnormal high temperatures. That is, in the washing machine, even if temporary energy is converted into heat such as deceleration of the dehydration tub, the heat energy can be sufficiently absorbed.

In the method of controlling the supply voltage to the inverter as in the present embodiment, when the motor is rotating at high speed as in the dehydration operation or when the motor load is large, the terminal voltage of the capacitor C, that is, the voltage to the inverter circuit 29b is applied. It is conceivable that the supply voltage is set high. In this case, when the induced voltage E0 of the motor 51 is returned to the power supply side and the induced voltage E0 is consumed, the voltage of the inverter circuit 29b or the terminal voltage of the capacitor C increases, and the withstand voltage of the components used in these circuits increases. It is necessary to do. When the power supply voltage of other devices is generated by using the voltage of the capacitor C, it is necessary to take measures to prevent such devices from being adversely affected. From these facts, it is desirable to reduce the return of the induced voltage E0 to the power supply side and to suppress the voltage rise as much as possible. In consideration of these facts, in this embodiment, heat is consumed as much as possible, and the return of the generated energy to the inverter on the power supply side is suppressed.

In FIG. 11, in order to decelerate the motor 51, it is necessary to consume power based on the induced voltage E0 as described above. For this reason, the motor 5
The voltage Vi and the phase δ supplied to 1 are controlled so that the q-axis component Vq of the voltage Vi is in an opposite phase at a voltage close to the induced voltage E0. Here, the voltage Vi is the rotational speed ωr of the motor.
(That is, N) and the induced voltage E0 based on this, the value of the voltage Vi is determined in advance based on these, and the predetermined voltage Vi is supplied during deceleration operation.

As described above, the voltage Vi is a voltage supplied to the motor 51 based on the PWM control by the inverter. For example, in the deceleration in the dehydration operation, as shown in FIG. 9, the voltage supplied from the capacitor C to the inverter is the voltage when the motor for dehydration is accelerated (V in FIG. 9).
6) Control to a lower voltage value (V1 in FIG. 9). Next, for the PWM control of the inverter, the phase δ and the voltage Vi are set so that the q-axis component of the voltage Vi becomes minus E0 (vector).
Is determined. Based on this, the inverter circuit is controlled.
In other words, the control pulse shown in FIG. 7B is generated to control the inverter, and the voltage Vi having the phase δ (the AC voltage waveform shown in FIG. 7A) is supplied to the motor.

However, if the voltage Vi is controlled to be constant, there is a possibility that the motor current Im becomes abnormally high. Therefore, the voltage Vi
Is preferably not constant. For example, the motor current Im is measured.
Or the measured current value is regarded as Im,
The voltage Vi is controlled. That is, the above measurement Im
Is large, the voltage Vi is reduced.
Control is performed to increase i.

FIG. 13 shows the state of the data in the memory for storing the predetermined value of the phase δ. N is a rotation speed of the motor 51, and is a table of, for example, 100 rpm and up to 1000 rpm. The increment of the table is determined by the control accuracy. If the step is coarsened to reduce the control accuracy, the difference between the induced voltage E0 and the q-axis component Vq of the voltage Vi becomes large, which causes an effect such as an increase in the voltage between the terminals of the motor and difficulty in performing the deceleration control. It is ideal to make the voltage Vq the same as the induced voltage E0 (the vector is in the opposite direction), but it is actually difficult. Therefore, preferably, the induced voltage E0 is 7
What is necessary is just to control in the range of 5% to 125%. Strictly speaking, the rotational speed N of the motor may be different from ωr, but there is no problem if N is considered to be the same as ωr. Phases δ1 to δ10 indicate values of the phase δ using the rotation speed N of the motor 51 as a parameter. Rotation speed N of motor 51
Is determined, the induced voltage E0 is determined, and the voltage Vi and the phase δ are determined. If the phase δ is recorded as data in advance, deceleration control can be performed by reading this data. That is, if the inverter is controlled using the recorded phase δ, the component Vq of the voltage Vi becomes equal to the induced voltage E0
Is close to the size of

FIG. 12 shows a vector diagram in a state where the speed is further reduced from the state of FIG. The difference from FIG. 11 is that the induced voltage E0 is small. Since the induced voltage E0 is proportional to the rotation speed of the motor, if the rotation speed of the motor decreases, the induced voltage E0 naturally decreases. Motor current Im
The smaller the value, the less energy is consumed and the brakes will not work. Therefore, the voltage Vi is set so that Im flows.
To determine.

In FIGS. 11 and 12, by controlling the phase δ,
If the voltage Vq is made smaller than the induced voltage E0, the braking force increases and the vehicle can be quickly decelerated. However, the return of the power from the motor to the power supply, that is, the voltage of the DC supply terminal on the inverter side (the capacitor C) increases.
On the other hand, if the voltage Vq is made larger than the induced voltage E0, the increase in the DC voltage can be suppressed, but the braking force decreases.
Therefore, the phase δ can be controlled, the relationship between the magnitude of the induced voltage E0 and the magnitude of the voltage Vq can be optimally selected, and the relationship between the braking force and the generated voltage can be optimally selected.

As described above, the relationship between the induced voltage E0 and the voltage Vq is controlled by controlling the phase δ so that the magnitudes of the induced voltage E0 and the voltage Vq are equal to each other. Can control. As another method, when the rotation speed of the motor is low, the DC voltage is less likely to be high, so that the voltage Vq is controlled to be smaller than the induced voltage E0 in order to increase the braking force at low speed. You may do it. For example, if the maximum rotation speed is 1000
rpm, at least 500% of the maximum rotation speed
The phase δ is controlled so that the induced voltage E0 is slightly larger than the voltage Vq at rpm or less, or at about 300 rpm or less than one third. For example, the ratio (induced voltage E0 / voltage V
By setting q) between 1 and 1.25, the braking force can be increased. The above-described control may be combined with high-speed rotation, and the above-described control may be combined with low-speed rotation.

FIG. 14 is a flowchart showing the operation of the brake control. In step S142, the position and rotation speed N of the rotor of the motor 51 are detected based on the output of the sensor 55. In step S144, the current Im of the motor 51 is detected. The voltage Vi is adjusted so that the current Im does not become higher.
Is determined in step S146. As described above, the voltage Vi is determined in step S142 so as to decrease the voltage Vi when Im is larger than the predetermined value and increase the voltage Vi when the current Im is lower than the predetermined value. Next, the phase δ is set in step S14.
Decide with 2. For example, the q-axis component of the voltage Vi is the induced voltage E0
The phase δ is calculated such that the magnitudes are equal (the vector is in the opposite direction). It is one control condition that the voltage Vq is equal in magnitude to the induced voltage E0, and other conditions are also considered as described above. In order to simplify the calculation, a value in which the above conditions are considered in advance can be read and determined. At this time, for example, the rotation speed N can be used as a parameter. Steps
In S150, the pulse shown in FIG. 7B is supplied to the inverter based on the voltage Vi and the phase δ to control the motor 51.

According to the above embodiment, the voltage generated from the motor can be controlled not to exceed a dangerous value while controlling the braking force. As a result, the voltage withstand voltage of the inverter and other circuit components can be kept relatively low. As a result, cost and reliability are improved.

The motor generates heat, but the washing machine has a good environment for absorbing heat, and can absorb heat. Therefore, generation of a high DC voltage is suppressed, which leads to improvement in reliability. In addition, the reliability with respect to the voltage can be improved in a washing machine that assumes use of water.

FIG. 15 shows a detailed circuit of the power supply section of FIG. When the power switch 13 on the operation panel shown in FIG.
4, resistor 1508, NO terminal and C terminal of power switch 13, noise cut line filter 17e, one input terminal of DC voltage generator 1512, DC voltage generator 15
A closed circuit consisting of the other input terminal 12 of the line filter, the other terminal of the line filter, and the power outlet 1502 is formed, and an AC voltage which is a commercial power supply is supplied to the DC voltage generation circuit 1512. The DC voltage generation circuit 1512 outputs a power supply voltage (5 volts in this embodiment) of the main microcomputer 17a. The main microcomputer 17a starts up by the supply of the power supply voltage from the DC voltage generation circuit 1512, and the main microcomputer 17a operates the first relay 1520 and the second relay 1522,
Each is connected. The first relay 1520 forms a parallel circuit with the terminal NO and the terminal C of the power switch 13. The first relay 1520 and the second relay 1522 are electrically connected to the line filter 17e in a former stage and a latter stage. Second relay 15
22 is located downstream of the line filter 17e, the connection of the second relay 1522 makes it possible to suppress noise from going to the previous stage of the line filter 17e even when various devices start up at the same time.

When the power switch 13 is operated, the terminal NO
And the circuit of the terminal C are connected. When the operation of the power switch 13 is completed, the terminal C and the terminal NC are connected, and a high-level signal is supplied to the input terminal 1548 of the main microcomputer 17a. Next, power switch 13 again
Is operated, the terminal NC is opened, and the input terminal 1548 of the main microcomputer 17a becomes low level. Based on such a change in the state of the input signal at the input terminal 1548, it is determined that the power of the washing machine has been cut off, the second relay 1522 is cut off first, and then the first relay 1
520 is shut off, and the washing machine stops operating.

In this embodiment, the main microcomputer 17a is first started by the operation of the power switch 13, and thereafter, the inverter circuit 29b and the DC voltage generation circuit 29a,
Power is supplied to other operating devices and driving devices (actuators). The reason is that the inverter circuit, the DC voltage generation circuit 29a, the actuators 21, 23 and 4
7a, if the inverter drive circuit 29g starts operating simultaneously with the control microcomputer, there is a risk of malfunction. The inverter circuit for driving the motor of the washing machine is driven by a DC voltage. This DC voltage is charged in a capacitor (corresponding to C in this embodiment) and supplied from the capacitor. The input impedance of this DC voltage generation circuit is low when the power is turned on, and the power supply voltage may be temporarily lowered. The power supply voltage supplied to the main microcomputer 17a becomes unstable, and the start-up of the main microcomputer 17a may be delayed. Second
These can be prevented by delaying the connection of the relay 1522.

In this embodiment, lines 1532 and 1534 are internal power supply lines, and are connected to the input terminal of the DC voltage generating circuit 29a in FIG. Therefore, the DC voltage generating circuit 29a is connected from the internal power supply lines 1532 and 1534.
Is supplied with an AC voltage. By operating the power switch 13, the internal power line 1532 is connected to the power outlet 1502, but the internal power line 1534 is connected to the power outlet 1502 until the second relay 1522 operates.
Do not connect to 2. Only when the second relay 1522 is driven to be connected by the microcomputer output 1544, the internal power supply line 1534 is connected to the power supply outlet 1502 and the DC voltage generation circuit 29a and the inverter circuit 29
b, auxiliary microcomputer 29h, inverter drive circuit 29g,
Position detection circuit 29f, DC voltage control circuit 29c, other water supply solenoid valve 21, drainage solenoid valve 23, clutch solenoid valve 4
7a, the lock mechanism (not shown) of the lid of the washing machine is also second.
After the relay 1522 operates, power is supplied. In the inverter circuit 29b and the inverter drive circuit 29g, a charging current flows to a capacitor or the like of the circuit when the power is turned on. For this reason, the power supply voltage may temporarily drop and become unstable. It is dangerous if power is supplied to the inverter and its inverter drive circuit 29g and the control circuit is unstable. For this reason, first, the main microcomputer 17a is normally started, and then power is supplied to the inverter circuit 29b, the inverter drive circuit 29g, and other solenoid valves.

A DC voltage generating circuit 29a is connected to the internal power supply lines 1532 and 1534, and a capacitor C is connected to the DC voltage generating circuit 29a. Therefore, the charging current of C is large, and conversely, the resistance value may be considered to temporarily decrease. In this embodiment, the terminal voltage of the capacitor C is changed by the operation of the washing machine, but the capacitor C is required on the input side of the inverter even if the PWM control is not changed. Therefore, it is desirable to start charging the C after starting up the main microcomputer 17a. In particular, when the water supply solenoid valve 21 for controlling tap water malfunctions, water is supplied to the washing tub, and the cloth amount and the cloth quality shown in FIG. 9 cannot be detected. For this reason, it is preferable that the water supply solenoid valve 21 supplies power after the main microcomputer 17a is started. FIG.
Alternatively, in FIG. 15, reference numerals 17b, 17c, and 17d denote triacs, and an output 154 of the main microcomputer 17a.
It operates with the signal of No. 6.

The DC voltage generating circuit 1512 has a DC voltage (5 volt in this case) supply terminal connected to a capacitor 15.
16 are provided, and a main microcomputer 17a is provided.
Even if the power supply voltage temporarily drops due to the above operation after the operation of the second relay 1522, the operation of the main microcomputer 17a is not disturbed.

The delay from the operation of the main microcomputer 17a to the supply of power to the actuators 21, 23, 47c, the DC voltage generating circuit 29a, and the like is 50 milliseconds (msec) or more, and preferably 100 milliseconds (mse).
c) A delay of about or more is desirable.

When the operation of the power switch 13 causes the operation of the washing machine to end, the second relay 1522 is turned off and then the first relay 1520 is turned off. Also in this case, it is desirable that the first relay 1520 be shut off after the voltage of the capacitor C decreases. The DC voltage supplied to each actuator and inverter drive circuit is 15 volts, and the DC power supply circuit supplying 15 volts operates even when the input voltage drops to about 25 volts. Therefore, for example, the capacitor C
The safety is further improved by cutting off 1520 after the voltage of the battery has dropped to about 25 volts.

The DC voltage generation circuit 1512 has a second output terminal 1518 for supplying power to the relay in addition to the first output terminal for supplying the power supply voltage of the main microcomputer 17a.
And a first relay 1520 and a second relay 1522
Power is supplied from this terminal.

The main microcomputer 17a is provided with a power supply terminal 1524. FIG.
The power supply voltage for the main microcomputer 17a is supplied from the 5-volt power supply output terminal 1624 of the power supply voltage generation circuit 1604 of the second power supply voltage generation circuits 1602 and 1604 shown in FIG.

The circuit of FIG. 16 operates as follows. Inverter circuit 29b which is the output of DC voltage generation circuit 29a
Supply voltage to the capacitor via the diode 1612
Supplied to 1614. The voltage of the capacitor 1614 is used as a power supply for the second power supply voltage generation circuits 1602 and 1604. In this embodiment, the power supply voltage generating circuits 1602 and 1
Reference numeral 604 indicates that the capacitor 1614 is connected not in parallel but in series. Although a parallel connection may be used, a series connection is less susceptible to noise due to the switching operation of the inverter circuit 29b. That is, the power supply voltage generation circuit 1602, which is the first stage of the series connection, generates a 15 volt voltage used for operating the actuator. A power supply voltage generation circuit 1604 is provided with a power supply (5) for operating digital circuits such as the microcomputers 17a and 29h.
Volt power).

In the above embodiment, a washing tub for washing laundry, a stirring blade rotatably installed inside the washing tub, and a motor for rotating the stirring blade are provided. An electric washing machine that performs a rinsing step, a DC voltage generation circuit that rectifies an AC voltage to generate a DC voltage, and an inverter circuit that receives the DC voltage from the DC voltage generation circuit and supplies power to the motor, A control circuit for controlling the inverter circuit, wherein the control circuit has a microcomputer, and further comprises an operation switch for turning on and off the power to the washing machine, and the microcomputer is first operated by operating the operation switch. The operation of the microcomputer is started, and the microcomputer operates to supply power to the DC voltage generation circuit and the inverter circuit. Reliability is improved since 濯機 is configured. In the electric washing machine, the reliability of the electric washing machine is further improved by supplying power to the DC voltage generating circuit and the inverter circuit with a delay of 50 msec or more after supplying the power supply voltage to the microcomputer.

In the above embodiment, a washing tub for washing laundry, a stirring blade rotatably installed inside the washing tub, and a motor for rotating the stirring blade are provided. An electric washing machine that performs a rinsing step, a DC voltage generation circuit that rectifies an AC voltage to generate a DC voltage, and an inverter circuit that receives the DC voltage from the DC voltage generation circuit and supplies power to the motor, A control circuit for controlling the washing machine; and an inverter drive circuit for driving the inverter circuit. The control circuit includes a microcomputer and a power supply circuit for supplying power to the microcomputer. An operation switch for turning on and off the power supply to the washing machine; and a first relay for turning on and off one of a power outlet from the washing machine and a power line from the outlet. And a second relay for turning on and off the other of the power supply lines from the outlet, and a power supply circuit for supplying power to the DC voltage generation circuit and the inverter drive circuit at a stage subsequent to the first and second relays The first switch is connected to operate the power supply circuit of the microcomputer by operating the operation switch, and the second relay is connected by the operation of the microcomputer. Since the power supply circuit that supplies power to the inverter circuit is operated, the reliability of the electric washing machine is improved.
In the washing machine, when the power of the washing machine is shut off based on the operation of the operation switch, first, the second relay is turned off by the operation of the microcomputer,
Thereafter, since the first relay is configured to be turned off, the reliability of the electric washing machine is further improved.

In FIG. 16, the power supply voltage generation circuits 1602 and 1604 are operated based on the voltage from the capacitor C which is the supply voltage to the inverter circuit 29b. Therefore, even if the commercial power supply is cut off during operation, the motor 51
Is rotating, the microcomputer 17a
And 29h operate correctly, and the inverter driving circuit 29
Detection circuits (including various sensors) such as g and the position detection circuit 29f continue to operate, and safety can be ensured.

The case where the supply of the commercial power supply is cut off may be, for example, a case where a child disconnects an outlet during selection. It is very dangerous if control becomes impossible due to the interruption of the power supply during the washing or dehydration of the washing machine. As a dangerous example, there is a problem that the dehydration tub during high-speed rotation does not easily stop when the power is cut off during the dehydration operation and the control becomes impossible.
In the present embodiment, utilizing the fact that the induced voltage due to the rotation of the motor is returned to the power supply side via the inverter circuit 29b, this voltage is supplied to the power supply voltage generation circuits 1602 and 1604, whereby the control circuit including the control circuit is required. Power can be supplied to a simple circuit and control can be maintained. Although the description has been made using the fact that the induced voltage due to the rotation of the motor is returned to the power supply via the inverter circuit 29b, it is preferable that the voltage be returned from the motor to the power supply. Even if it is not returned, the energy consumption of the capacitor C is suppressed, so that the stored energy of the capacitor C can be used, and the washing machine can maintain the control even after the commercial power supply is cut off, thereby improving safety. . Further, if the opening and closing of the lid of the dehydrator is controlled, the washing machine can be maintained in a controlled state until the rotation of the motor 51 decreases, and in addition, the opening and closing of the lid of the dehydrator can be controlled, that is, the closed state can be maintained. And maintain safety.

[0127]

According to the present invention, a highly reliable electric washing machine can be provided.

[Brief description of the drawings]

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

FIG. 2 is a vertical sectional side view showing a specific configuration of a fully automatic electric washing machine according to an embodiment of the present invention.

FIG. 3 is a vertical sectional side view showing an internal configuration of an electric driving device in the fully automatic electric washing machine according to one embodiment of the present invention.

FIG. 4 is a partially enlarged side view of the electric driving device shown in FIG. 3, showing a state in which a washing tub and a dewatering tub are stopped and a stirring blade is driven to rotate.

FIG. 5 is an enlarged side view of a part of the electric drive device shown in FIG. 3, showing a state in which a washing tub / dehydration tub and a stirring blade are rotationally driven.

FIG. 6 is an electric circuit block diagram of the fully automatic electric washing machine according to one embodiment of the present invention.

FIG. 7 is a waveform diagram of V / F constant control by sine wave PWM control.

FIG. 8 is a flowchart of a basic control process of a washing, rinsing, and dehydrating process executed by a main microcomputer of the fully automatic electric washing machine.

FIG. 9 is a basic control characteristic diagram of a DC output voltage (terminal voltage of a capacitor) of a DC voltage generation circuit which is convenient for operation control in the fully automatic electric washing machine according to one embodiment of the present invention.

FIG. 10 is an explanatory diagram of vector control of a motor as an example of the present invention during a spin-drying operation of a washing machine.

FIG. 11 is a vector diagram in an operation state in which a deceleration force is generated in the motor 51.

FIG. 12 is a vector diagram of a deceleration operation state in which the rotation speed of the motor 51 is further reduced.

FIG. 13 is a diagram illustrating a state in which a phase δ is recorded.

FIG. 14 is a flowchart showing an operation of brake control according to one embodiment of the present invention.

FIG. 15 is a detailed diagram of a power supply circuit according to one embodiment of the present invention.

FIG. 16 is a detailed diagram of a power supply circuit of the control device according to the embodiment of the present invention.

[Explanation of symbols]

14 input switch group, 17 first control device, 17a
… Main microcomputer, 21… Water supply solenoid valve, 23…
Drainage solenoid valve, 29: second control device, 29a: DC voltage generating circuit, 29b: three-phase inverter circuit, 29h: auxiliary microcomputer, 47: meshing clutch mechanism,
51: Brushless electric motor.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroyuki Koibuchi 1-1-1, Higashitaga-cho, Hitachi City, Ibaraki Prefecture Inside Hitachi Taga Electronics Co., Ltd. (72) Inventor Shoichi Ito 1-1, Higashitaga-machi, Hitachi City, Ibaraki Prefecture No. 1 Nichitagaga Technology Co., Ltd. (72) Inventor Shigemi Kawahara 1-1-1, Higashitagacho, Hitachi City, Ibaraki Prefecture F-term within Nichitagaga Technology Co., Ltd. 3B155 AA10 BA08 BA11 BB09 BB19 HC07 KA33 KB01 KB11 LB01 LB18 LB23 LC02 LC15 LC26 LC28 MA01 MA02 MA05 MA06 MA08 MA09 5H007 AA06 BB06 DB01 DB12 GA02

Claims (4)

[Claims] 1. A washing tub for washing laundry, a stirring blade rotatably installed inside the washing tub, and a motor for rotating the stirring blade, the washing step and the rinsing step being performed. An electric washing machine that performs: a DC voltage generation circuit that rectifies an AC voltage to generate a DC voltage; an inverter circuit that receives a DC voltage from the DC voltage generation circuit and supplies power to the motor; The control circuit has a microcomputer, and further comprises an operation switch for turning on and off the power to the washing machine, and the operation of the microcomputer first by operating the operation switch. An electric washing machine which starts up and supplies power to the DC voltage generating circuit and the inverter circuit by operation of the microcomputer. 2. The electric washing machine according to claim 1, wherein power is supplied to said DC voltage generation circuit and said inverter circuit with a delay of 50 msec or more after supply of a power supply voltage to said microcomputer. Machine. 3. A washing tub for washing laundry, a stirring blade rotatably installed in the washing tub, and a motor for rotating the stirring blade, wherein a washing step and a rinsing step are performed. An electric washing machine that performs: a DC voltage generation circuit that rectifies an AC voltage to generate a DC voltage; an inverter circuit that receives the DC voltage from the DC voltage generation circuit and supplies power to the motor; A control circuit for controlling, and an inverter drive circuit for driving the inverter circuit, wherein the control circuit has a microcomputer and a power supply circuit for supplying power to the microcomputer, and a power supply for the washing machine. An operation switch for turning on and off the power supply; and a first relay for turning on and off one of power outlets of the washing machine, and a power supply line from the outlet. And a second relay for turning on and off the other of the power lines from the power supply line, and a power supply circuit for supplying power to the DC voltage generation circuit and the inverter drive circuit at a stage subsequent to the first and second relays. Operating the operation switch to first connect the first relay to operate the power supply circuit of the microcomputer;
An electric washing machine wherein the second relay is connected by the operation of the microcomputer, and a power supply circuit for supplying power to the DC voltage generation circuit and the inverter circuit is operated. 4. The washing machine according to claim 3, wherein when the power of the washing machine is shut off based on the operation of the operation switch, the second relay is first turned off by the operation of the microcomputer, and then the second relay is turned off. An electric washing machine wherein the first relay is turned off.