JP2001137596A - Electric washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure stable damping characteristics via a simple structure in damping the dehydrating step of an electric washing machine. SOLUTION: For finishing a dehydrating step, negative-phase electromagnetic damping that feeds a reversible induction motor in the reverse direction to the dehydration rotation decelerates the rotation. The feeding time for the negative-phase electromagnetic damping is controlled in dependence on the load.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In a so-called fully automatic electric washing machine, a washing and dewatering tub is rotatably installed in an outer tub suspended and supported by an anti-vibration support device in an outer frame. The stirring blade is rotatably installed, and the washing and dewatering tub and the stirring blade are rotationally driven by a driving device attached to the outside of the bottom of the outer tub.

The driving device transmits the rotation of the electric motor to the stirring blade via a reduction gear mechanism, rotates the stirring blade forward and reverse at a low speed to perform a washing and rinsing process, and also performs a washing operation via a clutch mechanism. The washing and dewatering tub is transferred to the washing and dewatering tub at a high speed in one direction to perform a dewatering step.

[0004]

When the spinning process is completed, such a driving device of the fully automatic electric washing machine performs braking for stopping the high-speed rotating washing and spinning tub. In general, the braking torque for this purpose uses a mechanical friction braking force or a braking force obtained by direct current excitation of an induction motor.

However, mechanical friction braking has a problem that the mechanism becomes complicated and the braking characteristics deteriorate due to wear of the friction surface. In addition, DC braking has a problem that the electric circuit becomes complicated and the inrush current at the time of braking is large, so that the power supply voltage largely drops, causing malfunction of the control device and adversely affecting external electric devices.

An object of the present invention is to provide a stable braking characteristic with a simple structure at the time of braking in a spin-drying process.

Another object of the present invention is to realize a braking characteristic capable of stably and accurately stopping a washing and dewatering tub at the end of a dehydrating step with a simple configuration.

[0008]

SUMMARY OF THE INVENTION The present invention provides a washing and dewatering tub rotatably provided in an outer tub, a stirring blade rotatably provided inside the bottom of the washing and dewatering tub, In a driving device having a reversible rotary induction motor installed outside the bottom of the washing machine to drive the washing and dewatering tub and the stirring blade, and an electric washing machine having a control device, the control device ends the dehydration step. At times, the rotation speed is reduced by reverse-phase electromagnetic braking which supplies power to the reversible rotary induction motor in a direction reverse to the spinning direction.

The power supply time for the reverse-phase electromagnetic braking is controlled according to the load amount.

The reverse-phase electromagnetic braking measures a deceleration rate (deceleration time) from a predetermined rotation speed to a predetermined rotation speed at the time of the reverse-phase electromagnetic braking. The reverse phase power supply time is controlled by obtaining the phase electromagnetic braking stop time.

Further, the negative phase electromagnetic braking stop time is obtained by referring to a table based on the measured values.

In the above-described reverse-phase electromagnetic braking, a rate of rise (start-up time) up to a predetermined rotational speed at the time of start-up is measured.
The reverse phase power supply time is controlled by obtaining the reverse phase electromagnetic braking stop time until the stop based on the measured value.

Further, the negative phase electromagnetic braking stop time is obtained by referring to a table based on the measured value.

[0014]

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

Reference numeral 1 denotes a frame body including an internal mechanism. 2
Is a washing and dewatering tub, which is provided with a fluid balancer 3 at an upper edge thereof and a rotatable stirring blade 4 inside a bottom thereof. Reference numeral 5 denotes an outer tub that rotatably contains the washing and dewatering tub 2, and a driving device 6 is attached to the outside of the bottom by a steel-made mounting base 7. Suspended by. The internal configuration of the driving device 6 will be described later.

Top cover 9 provided with clothing input opening 9a
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).

A power switch 13, an input switch group 14, a display element group 15, and a water level signal corresponding to the water level in the outer tank 5 are generated in a front panel box 12 formed between the upper cover 9 and the front panel 10. Water level sensor 1
6 and a control unit 17 are built in. These constitute a control device.

A back panel box 18 formed between the upper cover 9 and the back panel 11 has a built-in electromagnetic valve 21 for supplying water to the faucet 19 and connecting the outlet to the water inlet 20. The water inlet 20 is formed so as to discharge water toward the opening of the washing and dewatering tub 2.

A clothing input opening 9a formed in the upper cover 9
Is opened and closed by a lid 22.

A drain port 5a formed at the bottom of the outer tank 5 is connected to a drain hose 24 via a drain solenoid valve 23, and the air trap 5b is connected to the water level sensor 16 via an air tube 25.

At the lower edge of the frame 1, a base 27 made of synthetic resin having legs 26 attached to the four corners is mounted.

FIG. 2 is a vertical sectional side view showing a specific configuration of the fully automatic washing machine, and a part of the configuration is shown in an expanded manner. 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.

FIG. 3 is a vertical sectional side view showing the internal structure of the driving device 6.

The drive unit 6 has a reduction gear mechanism, a meshing clutch mechanism, and a reversible rotary induction motor arranged vertically and concentrically with the drive / rotation axis of the washing and dewatering tub 2 and the stirring blade 4 as axes. This is the configuration.

The reduction gear mechanism is driven by a double inner / outer structure by means of ball bearings 33a and 33b inside the two separate reduction mechanism outer cases 32a and 32b mounted on the mounting base 7 with the mounting flanges together with the coupling flanges. The shaft system 34 is supported.

The drive rotating shaft system 34 includes 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 for directly transmitting the rotation of the electric motor to the washing and dewatering tub 2 to drive the washing and dewatering tub 2. The outer rotating shaft system extends outside the outer case 32a and extends outside the outer case 32a. An outer output shaft portion 35a for connecting the washing and spin-drying tub 2 to a tip end penetrating the outer case 32b and a serration 35b for engaging with a clutch mechanism formed on a cylindrical portion extending outside the outer case 32b, and a flange 35c at an inner end. Outer input shaft part 3 formed with
5d and a gear case portion 35e which is located in the middle of the gear case and accommodates the planetary gear reduction mechanism. An annular gear 3 constituting a part of a planetary gear reduction mechanism is provided on the inner periphery of the gear case portion 35e.
5f is fixed.

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. The agitating blade 4 is provided inside the washing / dewatering tub 2 from the tip of the outer output shaft portion 35a into the washing / dewatering tub 2 by a seal 37, metal bearings 38a and 38b, and a grip retaining ring (push nut) 39 in the inside 35a. A mounting screw 36a is formed at an outer end portion to which is attached, and an inner output shaft portion 36c having a serration 36b formed at an inner end portion protruding into the gear case portion 35e from the inner end and coupling with the planetary gear reduction mechanism, Ball bearings 40a, 40b are supported inside the input shaft portion 35d, and the outer end portion of the outer input shaft portion 35d extending in a cantilever state from the outer end thereof is rotated by a motor. An inner input shaft portion 36g in which a fitting portion 36d and a set screw 36e are formed, and a sun gear 36f is formed in an inner end portion extending into the gear case portion 35e, and the inner output shaft portion in the gear case portion 35e. A planetary gear 36 that is rotatably supported by a carrier 36h fitted to a serration 36b of the gear 36c and meshes with the gears 35f, 36f to transmit a reduced rotational force to the carrier 36h.
i.

The ball bearings 40a and 40b are mounted inside the outer input shaft portion 35d in a press fit state with respect to the inner input shaft portion 35d in order to support the inner input shaft portion 36g serving as the rotor shaft of the motor with high precision. As will be described later, the inner input shaft portion 36g supports the rotor of the induction motor in a cantilever state. Therefore, the bearing supporting the inner input shaft portion 36g has a small loss and a large radial load. Although ball bearings 40a and 40b, which are typical rolling bearings suitable for supporting the roller bearings, are used, roller bearings may be used instead.

The drive rotary shaft system 34 is formed by cold pressing a steel plate on which the components of the outer rotary shaft system are zinc-electroplated. Then, first, the outer output shaft portion 3
5a, the inner output shaft portion 36c is fitted into the metal bearing 38.
The output shaft portion is supported by a and 38b, is made water-tight by a seal 37, and is temporarily pressed by a grip retaining ring 39. Next, the gear case 35e is attached to the inner end of the outer output shaft 35a.
And temporarily assembled.

The temporary assembly in which the gear case 35e is fitted to the outer output shaft 35a is supported so as to be surrounded by the dies set in the press machine, and the punch 104 pushes the grip retaining ring 39 and pushes the outer side. The outer output shaft portion 35a and the gear case portion 35e are pressurized so that the end of the output shaft portion 35a is expanded.
Metal flow connection.

On the other hand, the input shaft portion is constituted by assembling the inner input shaft portion 36g with the ball bearings 40a and 40b in the outer input shaft portion 35d.

The serration projecting into the gear case 35e of the subassembly, which is supported so as to surround the fitting portion of the outer output shaft portion 35a and the gear case portion 35e by metal flow connection and set in a press machine. 3
6b, a carrier 36h is fitted, the planetary gear 36i is supported on the carrier 36h, and an annular gear 35f is fitted,
From above, the input shaft portion is turned upside down and fitted so as to cover the opening edge of the gear case portion 35e with the flange 35c. From above, the opening end of the gear case portion 35e is cut off to hold the outer peripheral edge of the flange 35c. The input shaft portion is coupled to the gear case portion 35e by pushing in a punch having an annular cutting blade that is bent inward so as to fit the input shaft portion.

In the motor, a motor housing 43 mounted in an insulated state by mounting screws 42 with an insulating member 41 interposed at the lower end surface of the outer case 32b is opened downward, and a plurality of stators 44 are fitted from the open ends. Is fixed so as to be sandwiched between the notch projection 43a and the bent claw 43b. Specifically, the stator 44 has a six-pole stator winding 44b wound around a stator core 44a so as to constitute a capacitor-phased type reversible rotary induction motor. The outer peripheral surface is fitted into and fixed to the motor housing 43, and then the motor housing 43 is attached to the lower end surface of the outer case 32b. A rotor 45 assembled to the stator 44 is fitted to a rotor fitting portion 36d formed on the inner input shaft portion 36g, and set screws 36e.
And is fixed by a lock nut 46 screwed into the nut.

The meshing clutch mechanism 47 couples the outer rotating shaft system 35 to the rotor 45 of the electric motor by meshing engagement and transmits the rotating force of the rotor 45 to the outer rotating shaft system 35 to rotate or mesh. The outer rotation shaft system 35 is locked so as to be prevented from rotating by releasing the engagement.

In order to reduce the overall size of the driving device 6 in the axial direction, the meshing clutch mechanism 47 has a ring-shaped electromagnetic core 47b containing a ring-shaped electromagnetic coil 47a inside the motor housing 43 by the mounting screw 42. The outer input shaft 35d is installed in the inner space surrounded by the end coil of the stator winding 44b. A slider 47c made of insulating resin, which is slidably engaged in the axial direction with a serration 35b formed in the outer input shaft portion 35d, is engaged with the meshing uneven plate 45c of the rotor 45 by a coil spring 47d. The engagement is released by raising the slider 47c against the pressing force of the coil spring 47d by the electromagnetic force of the electromagnetic coil 47a to release the engagement.
Adsorb to b and stop.

The slider 47c is provided by integrally forming an iron adsorber 47e to be attracted by the electromagnetic iron core 47b by outsert molding with PPS resin. Contact surface 45c
_The meshing projection 47f that meshes so as to be in contact with ₃ is integrally formed of a molding resin. On the inner side, serrations are formed so as to slidably engage in the axial direction with serrations 35b formed on the outer input shaft portion 35d.

The slider 47e of the slider 47c is connected to the electromagnetic core 4
A plurality of radial locking grooves 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 are formed to fit into the grooves.

The lower end of the motor housing 43 is
8 is fitted and covered. Then, a rotation detecting element (magnetic sensing element) 49 of the rotation detecting sensor is attached to the cover 48,
The rotation detecting element 49 is connected to the permanent magnet 45 of the rotor 45.
It is installed facing the rotation orbit of d.

In such a 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 driving device 6 is covered with an outer cover 51 attached together with the driving device 6 by the mounting screw 50.

FIG. 4 is a block diagram showing an electrical configuration of the fully automatic washing machine.

The control unit 17 comprises a microcomputer 17a and a power supply circuit 17b.
, A zero-cross signal generation circuit 17c, and a reset circuit 1
7d and semiconductor AC switching element for controlling the power relay 17e, the power supply to the electromagnetic coil 47a and the motor stator windings 44b of the water supply electromagnetic valve 21 draining solenoid valve 23 and the dog clutch mechanism (44b _1, 44b ₂₎ It includes a drive circuit 17f composed of (FLS) groups and diode groups, an oscillation circuit 17g for generating a clock signal, and a buzzer 17h.

The power supply circuit 17b generates a low-voltage DC voltage for a control circuit, the zero-cross signal generation circuit 17c generates a reference signal for controlling a semiconductor switching element, and the reset circuit 17d operates when a microcomputer is turned on. A reset signal for resetting the microcomputer 17a to a predetermined initial state is generated, and the transmission circuit 17g generates a clock signal for operating the microcomputer 17a.

The drive circuit 17f includes a stator winding 4 of the motor.
Regarding power supply control to 4b ₁ and 44b ₂ , two semiconductor AC switching elements (FLS) 17f ₁ and 17f ₂ for reversible rotation control and reverse rotation electromagnetic braking are provided. FLS17
f ₁ is a semiconductor ac switching elements in the forward rotational power feeding control, FLS17f ₂ is a semiconductor ac switching element of the reverse rotation feeding control. In addition, 44c is a phase dividing capacitor. Also, a valve controlling FLS17f _3, 17f ₄ for controlling the water supply electromagnetic valve 21 and the drain solenoid valve 23. With respect to the power supply control to the electromagnetic coil 47a, a phase control FLS17f ₆ for controlling the magnitude of the diode bridge 17f ₅ and the driving current for applying a direct drive current suitable for generating a large electromagnetic force Prepare. The electromagnetic coil drive current is set to a large current in the initial stage of attracting the adsorber 47e because a large electromagnetic force is required, and is controlled so as to reduce the current after the attraction to reduce heat generation.

The microcomputer 17a takes in input signals from the power switch 13, the input switch group 14, the water level sensor 16 and the rotation detecting element 49 in accordance with a control processing program installed in advance, and displays the display element group 15 and the power relay. 17e, the drive circuit 17f, and the buzzer 17h.

When the power switch 13 is turned on, the microcomputer 17a of the control unit 17
The power supply relay 17e is turned on to enter a standby state.

When the start of washing is instructed from the input switch group 14, the washing / dewatering mode set by the input switch group 14 is confirmed, and the washing / dehydrating process of the set washing / dehydrating mode is started.

FIG. 5 shows a control process executed by the microcomputer 17a in the basic washing / dewatering mode.

Step 101 The electromagnetic water supply valve 21 is opened to supply water to the outer tub 5 to a predetermined water level. This predetermined water level is a water level suitable for detecting the amount of cloth in the next step.
It monitors and monitors the water level detection signal output from.

Step 102: The amount of the cloth is detected. This cloth amount detection is performed based on the magnitude of the resistance of the laundry when the stirring blade 4 is rotated, as in the related art. For this purpose, the slider 47c is pulled up against the coil spring 47d by urging the electromagnetic coil 47a of the meshing clutch mechanism 47 to electromagnetically attract the adsorber 47e, and the meshing projection 47f of the slider 47c is moved by the electric motor. Contact surface 45c ₃ of the meshing irregularities of the rotor 45
Then, the attracting element 47e is attracted to the electromagnetic iron core 47b, and the locking ridge is engaged with the locking groove to lock the outer rotating shaft system 35 (the washing and dewatering tub 2) so as to suppress the rotation. . In this state, the stator coil 44b of the electric motor is energized to rotate the rotor 45, and the speed is reduced from the inner input shaft portion 36g via the planetary gear 36i, and then transmitted to the inner output shaft portion 36c to cause the stirring blade 4 to rotate. Rotate. Then, the inertial rotation speed when the driving is stopped is detected based on the output signal from the rotation detection element 49, and the cloth amount is detected based on the attenuation characteristic. By performing this detection process while changing the water level, it is possible to detect the cloth.

Step 103 The washing water level is determined according to the amount of cloth and the quality of the cloth, and water is supplied up to the washing water level. Step 104 A washing step according to the cloth amount and the cloth quality is executed. This washing step is performed by rotating the agitating blade 4 in the normal and reverse directions, and by washing the washing and dewatering tub 2 in the normal and reverse directions.
Can be selectively executed by continuously rotating in one direction.

The washing method performed by rotating the stirring blade 4 forward and reverse is as follows.
For example, it is suitable for washing laundry such as cotton underwear and socks with strong agitation. Further, the washing method in which the washing and dewatering tub 2 is rotated in the normal and reverse directions is suitable, for example, for washing large laundry such as sheets and bath towels so as to reduce entanglement and uneven washing. The washing method in which the washing and dewatering tub 2 is continuously rotated in one direction is suitable for washing laundry such as dry mark clothing so as not to lose its shape.

To wash the stirring blade 4 in the normal or reverse direction, the electromagnetic coil 47a of the meshing clutch mechanism 47 is urged to pull up the slider 47c, and the contact between the slider 47c and the rotor 45 is caused by the irregularities. solve engagement between contact surface 45 c _3,
The attraction element 47e is attracted to the electromagnetic core 47b, the locking ridge is engaged with the locking groove, the outer input shaft portion 35d is prevented from rotating, the washing and dewatering tub 2 is brought into a stationary state, and the rotor 45 is rotated forward and backward. The rotation is transmitted to the stirring blade 4 via the inner input shaft 36g, the planetary gear 36i, and the inner output shaft 36c by urging the stator coil 44 to rotate.

The method of washing by rotating the washing and dewatering tub 2 in the forward and reverse directions is to deactivate the electromagnetic coil 47a of the meshing clutch mechanism 47 and push down the slider 47c by the coil spring 47d to thereby engage the meshing projection 47f of the slider 47c. The rotor 45
Of the rotor 45
And the stator coil 44b is urged to rotate the rotor 45 of the motor forward and reverse, and this rotation is performed via the outer input shaft 35d, the gear case 35e, and the outer output shaft 35a. This is transmitted to the washing and dewatering tub 2.
At this time, since the planetary gear mechanism loses the speed reduction function, the stirring blade 4 rotates integrally with the washing and dewatering tub 2 in synchronism.

In the washing method in which the washing and dewatering tub 2 is continuously rotated in one direction, the water level is set low, and the electric motor is continuously rotated in one direction in a connected state in which the meshing clutch mechanism 47 is meshed. As the stator coil 44
This is realized by energizing b.

The selection of the three types of washing methods is determined by the microcomputer 17a according to the amount of cloth and the type of cloth or the washing mode set by the input switch group 14, and the electromagnetic coil 47a of the meshing clutch mechanism 47 is set. This is performed by controlling the engaged / disengaged state of the meshing clutch mechanism 47. If necessary, a washing method combining these can be used.

Step 105 A rinsing process is performed. This rinsing step is preferably performed in combination with shower dehydration rinsing and pool rinsing. How to combine, first perform a shower dehydration rinse,
After that, it is advisable to perform a pool rinse.

In the shower dehydration rinsing, the water supply electromagnetic valve 21 is opened to open the water supply electromagnetic valve 21 in a dewatering state by rotating the agitating blade 4 and the washing and dewatering tub 2 at a high speed to open the draining electromagnetic valve 23. This is performed by pouring water into the water tank 2.

At this time, in the dehydration in which the washing and dewatering tub 2 is rotated at a high speed, the meshing clutch mechanism 47 deenergizes the electromagnetic coil 47a in the same manner as in the washing method in which the washing and dewatering tub 2 is rotated. This is realized by engaging the slider 47d with the rotor 45 of the electric motor so as to be connected and rotating the electric motor at a high speed in a predetermined direction.

In the reservoir rinsing, the stirring blade 4 and the washing and dewatering tub 2 are kept stationary, the drainage electromagnetic valve 23 is opened to drain the washing water in the outer tub 5, and the washing and dewatering tub 2 is rotated at a high speed to dehydrate. Then, the drainage electromagnetic valve 23 is closed and the water supply electromagnetic valve 21 is opened to pour water into the washing and dewatering tub 2 to store rinsing water in the outer tub 5 and rotate the stirring blade 4 or the washing and dewatering tub 2. The operation of stirring the laundry is repeated.

Step 106 A dehydration step is performed. This dehydration step is performed in the same manner as the dehydration in the rinsing step described above.

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

When the spin-drying step is completed, the washing and spin-drying tub 2
The reverse phase electromagnetic braking by supplying power to the capacitor phase-separated reversible rotary induction motor in the reverse rotation direction to the dehydration rotation direction is effective for braking to reduce the rotation of the motor. This reverse-phase electromagnetic braking is used to reversely rotate the stirring blades 4 in the washing process so that the stator windings 44b ₁ and 44b ₂ of the reversible rotary induction motor are rotated.
The FLS17f ₂ counter-rotating feed control for feeding control to can be implemented using.

The stator windings 44b ₁ and 44b _{2 of the} induction motor
The DC braking method of generating a braking force by applying a DC voltage to the control unit 17 reduces the power supply voltage to 40 to 50 V because the inrush current of 14 to 15 A flows during braking. However, there is no possibility of malfunction due to a decrease in the power supply voltage in the reverse-phase electromagnetic braking in which the induction motor is supplied in the reverse direction because such a large inrush current does not flow.

In this reverse-phase electromagnetic braking, the reversible rotary induction motor generates a rotational torque in the reverse rotational direction.
If the reverse-phase electromagnetic braking power supply is continued even after the rotation is stopped, the reversible rotary induction motor rotates in the opposite direction. However, if the power supply time is insufficient, sufficient braking cannot be performed until the vehicle stops. Therefore, in this reverse-phase electromagnetic braking, the timing control of power supply stop is an important control element. Motor rotor 4
A control method in which the rotation speed of the motor 5 is obtained from an output signal from the rotation detection element 49 and the power supply of the reverse rotation electromagnetic braking is stopped with reference to the rotation speed may be considered. It is difficult to control.

In this embodiment, in the reverse-phase electromagnetic braking control, a method of controlling the reverse-phase electromagnetic braking power supply time according to the load amount (cloth amount) is employed in order to more accurately stop the power supply.

The deceleration rate of the rotation speed during the reverse-phase electromagnetic braking in the dehydrating step changes depending on the load. Therefore, in one embodiment, a deceleration rate (deceleration time) from a predetermined rotation speed to a predetermined rotation speed at the time of reverse-phase electromagnetic braking is measured, and based on the measured value, the reverse-phase electromagnetic braking until stopping is performed. The reverse phase power supply time is controlled by obtaining the stop time.

The rate of increase in the rotation speed at the start of the dehydration step varies depending on the load. Therefore, in another embodiment, the rising rate (starting time) up to a predetermined rotation speed at the time of starting is measured, and the negative phase electromagnetic braking stop time until the stop is determined based on the measured value to obtain the negative phase power supply. Controlled time.

The control of these negative phase power supply times is as follows.
The processing is executed based on the control processing by the microcomputer 17a.

FIG. 6 shows the operation control characteristics in the dehydration step in one embodiment described above. In the dehydration step, the stator winding 44b ₁ of reversible type induction motor by controlling ON / OFF of the FLS17f ₁ as the main winding, the predetermined performs feeding of the stator winding 44b ₂ and the auxiliary winding The dehydration operation is performed for a predetermined time at the rotation speed. Then, FLS1 after OFF the FLS17f ₁
The 7f ₂ and ON the stator winding 44b ₂ and the main winding, enters the reverse-phase electromagnetic braking by feeding anti-phase to the stator windings 44b ₁ and the auxiliary winding. Then, a deceleration rate (deceleration time) T until the rotation speed decreases from R1 to R2 is obtained with reference to the output signal from the rotation detection element 49, and a negative-phase electromagnetic braking stop time t until the rotation speed stops from the rotation speed R2. To control the reverse phase power supply time.

The rotation speeds R1 and R2 to be detected are within a range that the microcomputer 17a can obtain with high accuracy by referring to the output signal from the rotation detection element 49, and the rotation speed R2 is as low as possible. It is desirable to set the speed.

FIG. 7A shows the relationship between the load and the deceleration time T. FIG. 7B shows the relationship between the load and the negative-phase electromagnetic braking stop time t.
FIG. 8 is a control table showing specific numerical examples.

Therefore, the microcomputer 17a
By utilizing such a relationship, the reverse phase power supply time can be controlled by calculating the reverse phase electromagnetic braking stop time t by arithmetic processing or by referring to a table according to the measured deceleration time T.

FIG. 9 shows the operation control characteristics in the dehydration step in another embodiment described above. In the dehydration step, the stator winding 44b ₁ of reversible type induction motor by controlling ON / OFF of the FLS17f ₁ as the main winding, the predetermined performs feeding of the stator winding 44b ₂ and the auxiliary winding The dehydration operation is performed for a predetermined time at the rotation speed.
At the time of startup at this time, a startup time TA until the rotation speed increases to a predetermined rotation speed R3 is measured. And at the time of dehydration end, after OFF the FLS17f ₁ FLS17
The f ₂ and ON the stator winding 44b ₂ and the main winding, enters the reverse-phase electromagnetic braking by feeding anti-phase to the stator windings 44b ₁ and the auxiliary winding. Then, the reverse phase power supply time is controlled by obtaining the reverse phase electromagnetic braking stop time TB from the rotation speed R1 to the stop based on the start time TA.

FIG. 10A shows the load amount and the starting time TA.
FIG. 11B shows the load amount and the negative-phase electromagnetic braking stop time TB, and FIG. 11 is a control table showing specific numerical examples.

Therefore, the microcomputer 17a
By utilizing such a relationship, the reverse phase power supply time can be controlled by calculating the reverse phase electromagnetic braking stop time TB by arithmetic processing or by referring to a table according to the measured start time TA.

[0077]

According to the present invention, when the spin-drying step is completed, the rotation speed is reduced by the reverse-phase electromagnetic braking which supplies power to the reversible rotary induction motor in a direction reverse to the spin-drying direction. The obtained braking characteristics can be obtained with a simple configuration.

The power supply time for the reverse-phase electromagnetic braking is
Since the control is performed in accordance with the load amount, it is possible to obtain a braking characteristic capable of stably and accurately stopping the washing and dewatering tub with a simple configuration.

[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 the fully automatic washing machine shown in FIG. 1, and a part of the configuration is shown in an expanded manner.

FIG. 3 is a vertical sectional side view showing an internal configuration of a driving device in the fully automatic electric washing machine shown in FIG.

FIG. 4 is a block diagram showing an embodiment of an electrical configuration of the fully automatic washing machine shown in FIG.

FIG. 5 shows a control process executed by a microcomputer in the fully automatic washing machine shown in FIG.

6 is an operation control characteristic diagram of the fully automatic washing machine shown in FIG. 1 in a dehydrating step.

FIG. 7 is a characteristic diagram illustrating a relationship between a load amount and a deceleration time during braking in the dehydrating step illustrated in FIG. 6;

8 is a braking control table based on the braking characteristics shown in FIG.

9 is an operation control characteristic diagram of the fully automatic washing machine shown in FIG. 1 in a spin-drying process.

FIG. 10 is a characteristic diagram illustrating a relationship between a load amount and a deceleration time during braking in the dehydrating step illustrated in FIG. 9;

11 is a braking control table based on the braking characteristics shown in FIG.

[Explanation of symbols]

2 ... Washing / dewatering tub, 4 ... Agitating blade, 5 ... Outer tub, 6 ... Driver, 17 ... Control unit 45 ... Rotator, 45
c _3, contact surface, 47, meshing clutch mechanism, 47c
Slider, 47f ... meshing projection.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masao Watanabe 1-1-1, Higashitaga-cho, Hitachi City, Ibaraki Prefecture Inside Hitachi Taga Electronics Co., Ltd. No. 1 F-term in Hitachi Taga Electronics Co., Ltd. F-term (reference) 3B155 AA06 CB06 HB10 HB24 KA02 KB02 KB27 LA02 LB02 LC08 LC14 MA01 MA02 MA05 MA07 MA08 MA09 5H575 AA09 DD02 DD05 EE01 EE02 EE20 FF04 HA14 JJ03 JJ10 KK10 LL10

Claims (6)

[Claims] 1. A washing and dewatering tub rotatably provided in an outer tub, a stirring blade rotatably provided inside a bottom of the washing and dewatering tub, and a washing and dehydrating tub installed outside the bottom of the outer tub. In a driving device having a reversible rotary induction motor for driving the washing and dewatering tub and the stirring blade, and an electric washing machine having a control device, the control device is configured to control the reversible rotary induction motor when the dehydration step is completed. On the other hand, an electric washing machine characterized in that the rotation speed is reduced by reverse-phase electromagnetic braking in which power is supplied in the reverse direction to the spinning direction. 2. The electric washing machine according to claim 1, wherein the power supply time for the reverse-phase electromagnetic braking is controlled in accordance with a load amount. 3. The method according to claim 1, wherein the anti-phase electromagnetic braking comprises:
A deceleration rate (deceleration time) from a predetermined rotation speed to a predetermined rotation speed at the time of the negative-phase electromagnetic braking is measured, and the negative-phase electromagnetic braking stop time until the stop is determined based on the measured value. An electric washing machine characterized in that the electric washing machine is controlled. 4. The electric washing machine according to claim 3, wherein the negative phase electromagnetic braking stop time is obtained by referring to a table based on a measured value. 5. The method according to claim 1, wherein the negative-phase electromagnetic braking includes:
The rate of rise (start-up time) up to a predetermined rotation speed at the time of startup is measured, and the reverse-phase power supply time is controlled by obtaining the reverse-phase electromagnetic braking stop time until the stop based on the measured value. Electric washing machine characterized. 6. The electric washing machine according to claim 5, wherein the negative phase electromagnetic braking stop time is obtained by referring to a table based on the measured value.