JP2001224891A - Electric washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently rinse clothes by effectively utilizing characteristics of a driving motor. SOLUTION: The commercial AC voltage is rectified and raised by way of a DC voltage generation circuit 29a and fed to a three-phase inverter circuit 29b to drive a brushless motor 51. Therefore, by effectively utilizing the output characteristics of the small-sized brushless motor, an efficient rising process can be achieved.

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 electric washing machine is disclosed in, for example, JP-A-9-121584.

[0004] Although the technology is completely different from that of an electric washing machine, for example, in the technical field of an air conditioner, a technology of supplying power to an electric motor by inverter control has been proposed. This technique is disclosed in, for example, Japanese Patent Application Laid-Open No. 10-111028.

[0005]

In an inverter-controlled electric washing machine, the control of the motor is improved. However, it is necessary to improve the efficiency in the rinsing operation of the electric washing machine.

One object of the present invention is to propose an electric washing machine capable of performing an efficient rinsing operation.

The other objects will be described in the following embodiments.

[0008]

A feature of the present invention is that the voltage supplied to the inverter is controlled based on the rinsing step or the rinsing operation of the electric washing machine, and an appropriate voltage is supplied to the inverter. It is in. Specific solutions will be described in the following embodiments.

[0009]

Embodiments of the present invention will be described.

FIG. 1 is a vertical sectional side view of an electric 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 electric 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.

A clothing input opening 9a formed in the upper cover 9.
Has a structure that can be opened and closed 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 drive unit 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. The first control device 17 is arranged on 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 dehydration 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 configuration of the fully automatic washing machine, and a part of the configuration is expanded and shown. 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 FIGS.
It is a vertical side view which shows the internal structure of. 4 and 5
FIG. 4 is an enlarged side view of a part of FIG. 3.

The electric driving device 6 includes a washing tub and a dehydrating tub 2.
In addition, a reduction gear mechanism, a meshing clutch mechanism 47 and a reversible rotation type brushless electric motor 51 are concentrically arranged in series in the vertical direction with the drive rotation axis of the stirring blade 4 as an axis.

The reduction gear mechanism has a double inner / outer structure driven by ball bearings 33a, 33b inside a split speed reduction mechanism outer case 32a, 32b mounted on the mounting base 7 with the connecting flange together with the mounting flange 31. The shaft system 34 is supported.

The drive rotating shaft system 34 has a hollow outer rotating shaft system and an inner rotating shaft system disposed in the hollow.

The outer rotating shaft system is a rotating shaft system that transmits the rotation of the electric motor to the washing tub / dewatering tub 2 directly and drives 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 rotates, the annular gear 35f, the planetary gear 36i, the carrier 36h, and the inner output shaft portion 36c rotate simultaneously, and the stirring blade 4 causes the washing tub (or washing tub and detaching tub) to rotate. (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 it to the stirring blades 4 to drive the stirring blades 4. A seal 35, metal bearings 38a and 38b, and a grip retaining ring (push nut) 39 are provided in the inside 35a in a watertight and retaining 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 an outer end portion where the stirring blade 4 is mounted.
6a. The inner rotation shaft system includes an inner output shaft portion 36c, 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. . Inner input shaft 3
6g is a ball bearing 4 inside the outer input shaft portion 35d.
0a, 40b. Outer input shaft 3
Inner input shaft portion 36 extending in a cantilever state from the outer end of 5d
At the outer end portion of g, a fitting portion 36d to which a rotor of a motor, that is, an electric motor is fixed by a set screw 36e is formed. 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 serving as 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 be formed short by using a dedicated inner input shaft having a short motor rotor fitting portion.

The permanent magnet magnetic pole 54b is formed so as to protrude outside the stator winding 52b, and the magnetic pole detecting element 55 is provided so as to face the rotation orbit of the protruding portion. It is configured to detect the rotational position of. 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 meshing clutch mechanism 47 couples the outer rotating shaft system 35 to the rotor 54 of the electric motor by meshing engagement, and transmits the rotating force of the forward rotation and the reverse rotation of the rotor 54 to the outer rotating shaft system 35. And the outer rotating shaft system 35 is locked so as to prevent the outer rotating shaft system 35 from rotating.

In order to reduce the overall size of the electric driving device 6 in the axial direction, the meshing clutch mechanism 47 is provided with an annular electromagnetic iron core 47b including 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, and an engaging projection 47f that is fitted into and meshes with the engaging concave and convex portion 54d by resin molding. It is formed.

The slider 47e of the slider 47c is connected to the electromagnetic core 4
A plurality of radial locking grooves 47b1 are formed on the suction surface of the electromagnetic iron core 47b so as to lock and prevent the slider 47c from rotating when the slider 47c is attracted to the slider 7b. A plurality of radial locking ridges 4 fitted in the stopping grooves 47b1
7e1 is formed. The locking groove 47b1 is provided with a locking ridge 47e.
1 is formed so as to expand at an angle of 1 to 2 degrees in the depth direction, and the locking ridge 47e1 is formed such that the side surface that contacts the side wall surface of the locking groove 47b1 is 1 to 2 degrees in the tip direction. Is formed so as to be widened by the inclination of, so that a component force in the retaining direction is generated when the meshing engagement is performed.

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.

The main microcomputer 17a and the auxiliary microcomputer 29h constitute a control circuit, and include a DC voltage generation circuit 29a to be described later and an inverter circuit 29b.
And generating a first control signal for controlling a voltage value of a DC voltage supplied to the power supply. The terminal voltage of the capacitor c, that is, the supply voltage to the inverter circuit 29b is controlled based on the first control signal. 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. Brushless motor 51 based on the second control signal
Are also controlled (forward rotation and reverse rotation).

The illustration and description of the low-voltage power supply circuit and power supply switch 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 is a semiconductor AC switching element which controls the power supply to the electromagnetic coil 47a of the clutch mechanism 47 by meshing with the water supply solenoid valve 21 and the drainage solenoid valve 23. (FLS) drive circuits 17b to 17d 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, 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 generation circuit 29a includes a full-wave rectification diode bridge DB which is a rectification circuit for rectifying a commercial AC power supply and outputting a DC voltage. This DC voltage generation circuit 29a functions as a charging circuit for the capacitor c.
By incorporating a step-up converter circuit, which is a type of switching regulator, the electromagnetic energy stored in the reactor L during the ON period of the switching element S1 is converted into a voltage by turning off the switching element S1 and superimposed on the input voltage. In this configuration, a boosted voltage is supplied to the capacitor C to store electric charges. The diode D
1 stabilizes the DC output voltage by preventing reverse flow of the charge stored in the capacitor C. The amount of boost is determined by the switching element S
It changes depending on the on-time ratio with respect to one 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 converts the full-wave rectified voltage to about 300 V
The output is variably controlled within the output voltage range up to. As the switching element S1, like IGBT or GTO,
A semiconductor element having a function of turning off by itself is preferable.

The DC voltage control circuit 29c for controlling the DC voltage generation circuit 29a refers to a detection voltage which divides the output voltage of the DC voltage generation circuit 29a by the output voltage feedback resistor 29d and the 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 is composed of 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 illustrates 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 auxiliary microcomputer 29h outputs the triangular wave.
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

In the V-constant sine wave PWM control, the input voltage is maximized by setting the magnitude of the sine wave to be compared with the triangular wave to a constant value so 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. Control to change the DC output voltage of the DC voltage generation circuit 29a by controlling the inverter drive circuit 29g and the voltage control resistor 29e.

As described above, the DC voltage control circuit 29c controls the DC voltage generation circuit 29a so that the detection voltage becomes a predetermined value (corresponding to the output voltage of 155 V). 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-step (for example, 155V, 185V, 190V, 21V) by opening and closing the control terminal of the voltage control resistor 29e.
0V, 230V, 270V). In this implementation, the first control signal is the voltage control resistor 29
It is expressed by which resistor of e is released. 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,
What is necessary is just to make the desired voltage appear 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 Amount or Cloth) Detection of the cloth amount or the cloth quality is performed. This detection result 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 water supply, power is supplied to the brushless electric motor 51 to rotate the stirring blades 4, and the load resistance at that time is reduced. The dry cloth amount is detected based on this (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 into 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 the lowest output voltage of the DC voltage generation circuit 29a. 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 reason is that the electric driving device 6 at the time of these detections
Presses up the slider 47c against the coil spring 47d by urging the electromagnetic coil 47a of the meshing clutch mechanism 47 to electromagnetically attract the adsorber 47e, and raises the meshing projection 47f of the slider 47c of the electric motor. The rotor 47 is separated from the meshing concave and convex portions 45c3, the attractor 47e is attracted to the electromagnetic iron core 47b, and the locking ridges 47e1 and the locking grooves 4 are formed.
7b1 is engaged so as to suppress the rotation of the outer rotating shaft system 35 (the washing / dewatering tub 2). 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 36g via the planetary gear 36i, the inner output shaft 36 is rotated.
c 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.

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 and the degree of dirt. The washing mode is prepared as a variety of washing mode control programs configured by combining the washing intensity (the intensity of stirring by the stirring blade 4 and the washing / dewatering tub 2 and the intensity of the washing water flow) and the 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 them is selected and executed. This also inputs the strength of the washing water flow.

In this embodiment, the washing strength is divided 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 of the washing strength section 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 portion 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. Maintain at or above v1 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 in the normal / reverse direction, 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 that the rotor 54 rotates 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. Maintain at or above v1 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 electric 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. In this state, the output voltage of the DC voltage generation circuit 29a is set higher than when the stirring blade 4 rotates in the normal or reverse direction unless there is a large difference in the amount of washing water. In addition, the washing tub and the dehydrating tub 2 are set higher than those in the operation of the washing strength section in which the washing tub 2 is rotated forward and backward.

The washing intensity (washing water flow) changes depending on the output torque of the brushless motor 51 and the rotation time period (power supply 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 power is supplied to the brushless motor 51 (sine wave PWM) by the three-phase inverter circuit 29b, and the operation is stopped. Time of forward / reverse rotation of 1.4 seconds (forward rotation direction power supply) /0.9 seconds (pause) /1.4 seconds (reverse rotation direction power supply) /0.9 seconds (pause)
Repeat with. Similarly, in the standard washing B1 with a large amount of dirt, the DC output voltage of the DC voltage
A constant value of 30 V is set, and the power supply to the brushless motor 51 and the suspension by the three-phase inverter circuit 29b are set to 1.1.
It is repeated every second (power supply) /0.9 second (pause).
In addition, in the intermediate washing C1 with a large amount of dirt, the DC voltage generation circuit 2
The DC output voltage 9a is set to a constant value of 190 V, and the three-phase inverter circuit 29b supplies and suspends power to the brushless motor 51 for 0.8 seconds (power supply) /1.0 seconds (pause).
To repeat. In addition, in the weak washing D1 with a large amount of dirt, the DC output voltage of the DC voltage generation circuit 29a is reduced to 190V.
And the power supply to the brushless motor 51 and the pause by the three-phase inverter circuit 29b are repeated at 0.5 seconds (power supply) /0.7 seconds (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. Then, the DC output voltage of the DC voltage generation circuit 29a is reduced to 185V to 1.1. The power supply for a second 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. In the standard washing B2 with less dirt, the DC output voltage of the DC voltage generation circuit 29a is set to 210 V, and the power supply to the brushless motor 51 by the three-phase inverter circuit 29b is executed for 0.3 seconds to start 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 140V. The control is executed to continue the rotation with a small output torque, and thereafter, the control of pausing for 1.0 second is repeated in the forward and reverse rotation directions. 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 with a large output torque. Then, by adding voltage limit 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, and the three-phase inverter circuit 29b is started with a large output torque. 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 the 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 middle of the 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 is 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 three-phase inverter circuit 29b supplies and suspends power to the brushless motor 51 by 0.5 seconds (power supply) /1.0 second (pause).
To repeat.

In the washing intensity category F in which the washing / dewatering tub 2 is rotated forward and backward, for example, the DC voltage generating circuit 29a
Is set to 155 V and the voltage limit PWM control is added to the sine wave PWM control by the three-phase inverter circuit 29b, so that the peak value of the sine wave voltage supplied to the brushless motor 51 becomes 80V. A power supply is performed for 6 seconds, a gentle rotation is continued with a small output torque, and then a control for stopping for 3.0 seconds is repeated in a forward / reverse rotation direction. A tank rotation washing F1 and a tank for supplying power for 4 seconds and stopping for 3 seconds. The rotating washing F2 and the tank rotating washing F3 in which power is supplied for 3 seconds and then stopped for 2 seconds are performed.

In the washing intensity 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. Then, 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 dirt by combining the degree of dirt and the above-described washing intensity and washing time, 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, and less dirt) and 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, and is, for example, 1 for heavy washing A1.
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. Wash wash mode M25
And a washing mode M27 for washing for 4 minutes with weak washing D1 and a washing mode M27 for washing for 3 minutes with fine washing E.

The third washing mode group M3 is a washing mode group for a less soiled laundry in which each washing mode is constituted by combining a plurality of washing intensities. Washing for 1 minute and 30 seconds in the rotating tank F2, washing for 4 minutes in the standard washing B2, and washing for 1 minute and 30 seconds in the rotating tank 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.

The rinsing and 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 and dewatering 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. More 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 region rises more steeply. And the low speed region (0-130r
pm) 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 second mode in which the middle speed region is started up slowly and the other regions are started up relatively steeply. A sixth rinse dehydration was run, running for 30 minutes.

The rinsing and dewatering mode of the laundry with less dirt is configured by changing the rotation speed of the washing / 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 a minimum capacitor voltage v1 when the DC voltage generation circuit 29a is outputting a DC voltage in the rinsing step (t3 to t13 in FIG. 9), and a highest capacitor voltage in the rinsing step. When v2, v0 = v
1+ (v2−v1) / 2.

Step 805 The dehydration step after the rinsing step, that is, the final dehydration step (t
13 to t14). In the dehydration step, similarly to the above-described washing step and rinsing step, control is performed so as to change the dehydration power in accordance with the cloth quality and the degree of dirt. 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 dehydration mode is configured by setting the rotation speed of the washing / dehydrating tub 2 to 900 rpm, and changing the startup method and the operation time (total time from activation).

The dehydration mode (dehydration mode after the rinsing step) includes a first dehydration mode in which the low-speed region (0 to 130 rpm) is slowly started, and thereafter, is started relatively steeply and operated for 9 minutes. Similarly, a second dehydration mode in which the apparatus is started up and operated for 8 minutes, a third dehydration mode in which the apparatus is similarly started up and operated for 7 minutes, and a low-speed region (0 to 130 rpm)
A fourth dehydration mode in which the device is started up relatively steeply and operated for 6 minutes, a fifth dehydration mode in which the device is started up and operated for 5 minutes, and a sixth dehydration mode in which the device is started up and operated for 4 minutes In the same manner, a seventh dehydration mode for starting up and operating for 3 minutes was prepared.

The rotation speed control in this dehydration mode is 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 controls the display element group 15 to display the set state and the process progress state and displays 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 in order to obtain various optimum rotational speed characteristics as described above with 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 a minimum capacitor voltage v1 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
= V1 + (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 tub and dehydrating 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 29b operates as the washing tub. The dewatering tank 2 and the stirring blade 4 are controlled 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 is set.
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.

Therefore, it is possible to provide an electric washing machine which can realize a fine washing and dewatering process according to the quantity, quality and form of dirt of the laundry, and which can perform various washing and dehydrating operations. Can be.

[0109]

According to the present invention, it is possible to provide an electric washing machine capable of performing efficient rinsing.

[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.

[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 Shoichi Ito 1-1-1, Higashitaga-cho, Hitachi City, Ibaraki Prefecture Inside Hitachi Taga Technology Co., Ltd. (72) Yuichiro Takamune 1-chome, Higashitaga-cho, Hitachi City, Ibaraki Prefecture No. 1-1 Hitachi Taga Electronics Co., Ltd. (72) Inventor Mitsuhisa Kawamata 1-1-1, Higashitagacho, Hitachi City, Ibaraki Prefecture Incorporated Hitachi Taga Electronics Co., Ltd. (72) Inventor Isao Hiyama, Higashitaga Town, Hitachi City, Ibaraki Prefecture 1-1-1, Hitachi Taga Electronics Co., Ltd. (72) Inventor Shigemi Kawahara 1-1-1, Higashitaga-cho, Hitachi City, Ibaraki Prefecture Inside Hitachi Taga Technology Co., Ltd. (72) Inventor Toshiyuki Uchiyama Hitachi, Ibaraki Prefecture 1-1-1 Higashitaga-cho, Tokyo

Claims (12)

[Claims] A washing tub and a dewatering tub rotatably installed in an outer tub; a stirring blade rotatably installed in the washing tub and dehydration tub; and a driving motor as a power source. An electric drive device for driving the dewatering tub and / or the stirring blade, a water supply / drainage means for supplying / draining water to / from the outer tub or the washing tub and a dehydration tub, and a control device for controlling power supply to the drive motor and the water supply / drainage means; An electric washing machine that performs a rinsing step of supplying rinsing water, rotating the agitating blades, rinsing and stirring, and then performing a dehydrating step, after draining and rotating the washing tub / dehydrating tub to spin and dewater. The control device includes a DC voltage generation circuit, an inverter circuit that supplies power from the DC voltage generation circuit to the drive motor, and a control circuit that controls the DC voltage generation circuit and the inverter circuit. In the rinsing step, the DC voltage generating circuit is configured so that the voltage of the condenser during the spin-drying operation by rotating the washing / dewatering tub is higher than the voltage of the condenser during the rinsing and stirring by rotating the stirring blade. An electric washing machine characterized in that it is controlled. 2. The method according to claim 1, wherein, during the dehydrating operation in the rinsing step, the voltage of the capacitor is set to a voltage v.
0 is maintained at a value higher than 0, and the rising characteristic of the rotational speed of the drive motor is controlled by controlling the inverter circuit. An electric washing machine characterized in that v0 = v1 + (v2−v1) / 2, where v1 is the lowest capacitor voltage in the above and v2 is the highest capacitor voltage in the rinsing step. 3. The electric washing machine according to claim 2, wherein the voltage of the condenser during the spin-drying operation in the rinsing step is maintained at a substantially higher value than the value v0. 4. The electric washing machine according to claim 2, wherein the voltage of the condenser during the dehydrating operation in the rinsing step is gradually increased from a value higher than v0. 5. The electric machine according to claim 1, wherein the increasing characteristic of the rotation speed of the drive motor during dehydration in the rinsing step is controlled in accordance with the cloth quality of the laundry. Washing machine. 6. A method according to claim 1, wherein the characteristic of increasing the rotation speed of the drive motor during dehydration in the rinsing step is slower than the characteristic of increasing the rotation speed in the dehydration step after the rinsing step. An electric washing machine characterized by the above-mentioned. 7. The electric washing machine according to claim 1, wherein the dehydration time in the rinsing step is shorter than the dehydration time in the dehydration step after the rinsing step. 8. The electric washing machine according to claim 1, wherein the dehydration time in the rinsing step is changed according to the quality of the laundry. 9. The washing machine according to claim 1, wherein in the operation of rinsing by rotating the washing / dewatering tub while supplying water to the washing machine, the voltage of the condenser is rotated to rotate the stirring blade in the washing step. An electric washing machine characterized in that the voltage is higher than the voltage of the condenser in a state where the washing tub and the spin-drying tub are not rotated, and the drive motor is driven to rotate the washing tub and the spin-drying tub. 10. A washing tub placed in an outer frame of a washing machine, a stirring blade rotatably installed in the washing tub, a motor for driving the stirring blade to rotate, and the motor An electric washing machine that performs a washing step, a rinsing step, and a dehydrating step, the control apparatus comprising: a control circuit that generates a first control signal and a second control signal; It has a charging circuit for rectifying current and charging a capacitor, and an inverter circuit for receiving the voltage of the capacitor and supplying power to the motor. An electric washing machine wherein the condenser holds a voltage equal to or higher than a predetermined value in a stopped state. 11. An electric washing machine according to claim 10, wherein a voltage is supplied to said inverter circuit, but said motor is not energized. 12. A washing tub for storing laundry, a stirring blade rotatably installed in the washing tub, a motor for rotating the stirring blade, and a control device for controlling the driving motor. An electric washing machine that performs dehydration a plurality of times in a rinsing step, wherein the control device supplies a voltage to the motor by rectifying an alternating current and charging a capacitor, and receiving the voltage of the capacitor. An electric washing machine, comprising: an inverter circuit that performs an operation by setting a supply voltage from the capacitor to the inverter in a first dehydration operation to be higher than a voltage in a subsequent dehydration operation.