JP2001293286A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently use time to feed water for removing spots on laundry by making washing water act on the laundry in a water feeding process of feeding water in a bathtub, and the like, using a pump so as to ensure detergency while reducing washing unevenness, and to reduce a noise resulting from an operating sound. SOLUTION: A pulsator 3 is rotatably provided in an inner bottom part of a spinning tub 2, and an inverter circuit drives a first motor 7 for rotating and driving the spinning tub 2 and the pulsator 3 and a second motor 15 for driving the pump 14 for feeding the water in the bathtub, and the like, into the spinning tub 2. A control means stops the second motor 15 at water lever than a specified level, at least the first level, detected by a water level detecting means 9 for detecting the water level of the spinning tub 2 in feeding the water in the bathtub, and the like, by operating the pump 14, and then rotates and drives the first motor 7 to rotate and drive the spinning tub 2, and rotates and drives the pulsator 3 so as to make stirring time longer in each process at a low water level as the specified water level increases.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is configured such that a motor for rotating a washing / dewatering tub and a pulsator and a motor for driving a pump for supplying bath water and the like into the washing / dewatering tub are driven by an inverter circuit. Related to washing machines.

[0002]

2. Description of the Related Art The construction of a pulsator type washing machine, which is one of the conventional typical washing systems, will be described with reference to FIG.

As shown in FIG. 10, an outer tub 80 has a washing and dewatering tub 82 in which a pulsator 81 is rotatably arranged at the bottom.
And suspended from the washing machine outer frame 84 by the suspension rod 83. The motor 85 drives the pulsator 81 or the washing / dewatering tub 82 via the V-belt 86 and the speed reduction mechanism / clutch 87. The drain valve 88 drains the washing water in the washing and dewatering tub 82, and the water supply valve 89 supplies water to the washing and dewatering tub 82.

The washing and dewatering tub 82 is provided with a fluid balancer 90 for reducing vibration during dehydration, and a lid 91 is provided above the washing and dewatering tub 82. Control device 92
Controls the motor 85, the drain valve 88, the water supply valve 89, and the like to sequentially control the washing, rinsing, and dehydrating processes.

The operation of the above construction will be described. When the operation is started after the laundry and a predetermined amount of detergent are put into the washing and dewatering tub 82, the water supply valve 89 is controlled by the control device 92 so that the washing and dewatering tub 82 is controlled. A predetermined amount of water is supplied to the inside, and then the motor 85 is controlled by the control device 92 to rotate the pulsator 81. The rotation of the pulsator 81 agitates the laundry and the water in the washing / dewatering tub 82, and the agitation causes the detergent to gradually dissolve into washing water, which acts on the soil of the laundry.

[0006]

However, in the case of the washing machine of this configuration, in order to dissolve the supplied detergent,
Generally, the pulsator 81 is rotated at a high speed to stir the laundry and water. In this case, a predetermined amount of water is supplied to the washing and dewatering tub 82 in order to prevent excessive mechanical force from being applied to the laundry. And then stirring with the pulsator 81.

That is, since the pulsator 81 is not agitated until a predetermined amount of water is supplied, this water supply time has no meaning from the viewpoint of removing stains from the laundry. In addition, the supplied water will permeate the laundry as it is, and in this case, the detergent that has begun to dissolve due to the start of stirring penetrates the entire laundry and reaches a predetermined level until the concentration is uniform to a level necessary for removing stains. Time is required, and in this case too, it is wasted time from the viewpoint of dirt removal.

When water is supplied into the washing and dewatering tub 82, there is known a method in which water is supplied using a pump that absorbs bath water, but this also has the same time problem as described above. In addition, in the case of water supply by the pump, there is a problem in noise caused by the operation sound of the pump.

The present invention has been made to solve the above-mentioned problems, and in a water supply process of supplying bath water or the like by a pump, washing water is made to act on the soil of the laundry so that the water supply time is effectively used for removing the soil of the laundry. Another object of the present invention is to secure washing power, reduce uneven washing, reduce noise caused by operation noise of the pump, and reduce noise.

[0010]

According to the present invention, in order to achieve the above object, a pulsator is rotatably disposed at an inner bottom of a washing and dewatering tub for storing laundry, and the pulsator is rotated by rotating the pulsator. An inverter circuit drives a first motor to be driven and a second motor to drive a pump for supplying bath water and the like into the washing and dewatering tub, and outputs an output of a water level detecting means for detecting a water level of the washing and dewatering tub. The control means is configured to control the inverter circuit so as to control the inverter circuit, and when operating the pump to supply bath water or the like, the control means controls at least one level of water level lower than the predetermined water level detected by the water level detection means. , While stopping the second motor,
And the pulsator is driven to rotate after the washing and dewatering tub is driven to rotate, so that the higher the predetermined water level, the longer the stirring time in each stage of the low water level.

[0011] Thus, in the water supply step of supplying bath water or the like by the pump, the washing water can act on the stains on the laundry, and the water supply time can be effectively used for removing the stains on the laundry, and the cleaning power can be secured. In addition, it is possible to reduce washing unevenness, and to drive the second motor that drives the pump by the inverter circuit to reduce noise caused by the operation noise of the pump and reduce noise. In addition, since the pulsator can be rotated after the washing water has sufficiently acted on the laundry, the detergent concentration of the washing liquid can be increased by stirring the detergent earlier, thereby improving the effect of removing dirt. it can.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a washing and dewatering tub for storing laundry, a pulsator rotatably disposed on the inner bottom of the washing and dewatering tub, A first motor that rotationally drives the combined spin-drying tub and the pulsator, a second motor that drives a pump that supplies bath water and the like into the washing and spin-drying tub, and drives the first motor and the second motor. An inverter circuit, a water level detecting means for detecting a water level of the washing and dewatering tub, and a control means for inputting an output of the water level detecting means and controlling the inverter circuit, wherein the control means operates the pump. When supplying bath water or the like, at least one stage water level lower than the predetermined water level detected by the water level detection means,
While the second motor is stopped, the first motor is rotationally driven, the washing and dewatering tub is rotationally driven, and then the pulsator is rotationally driven. The higher the predetermined water level, the lower the water level in each stage. It is configured to lengthen the stirring time, and in the water supply process of supplying bath water etc. with a pump,
The washing water can act on the soil of the laundry at a water level lower than the predetermined water level, the water supply time can be effectively used for removing the soil of the laundry, and the washing and dewatering tub by the first motor can be used. By rotating the pulsator to make the washing water act evenly on the dirt on the laundry, it is possible to secure the detergency and reduce the washing unevenness, and to drive the second motor for driving the pump by the inverter circuit. Noise caused by the operation sound of the pump can be reduced to reduce noise. In addition, since the pulsator can be rotated after the washing water has sufficiently acted on the laundry, the detergent concentration of the washing liquid can be increased by stirring the detergent earlier, thereby improving the effect of removing dirt. it can.

According to a second aspect of the present invention, in the first aspect of the present invention, in the pulsator rotation driving step, the higher the water level, the higher the number of rotations. , The frictional force on the surface of the laundry is reduced, and the damage to the laundry can be reduced.

According to a third aspect of the present invention, in the first or the second aspect of the present invention, in the washing and dewatering tub and the pulsator rotating drive process, the higher the predetermined water level, the more the lower water level is increased. The higher the predetermined water level, the greater the amount of detergent added.In order to maintain the solubility of the detergent at each predetermined water level, the higher the predetermined water level, the higher the washing and dewatering tub and the rotation of the pulsator. The solubility of the detergent at each predetermined water level can be made the same, so that the cleaning performance can be maintained and the detergent residue can be reduced.

[0015]

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

(Embodiment 1) As shown in FIG.
Includes a washing and dewatering tub 2 and a pulsator 3 rotatably provided at the bottom of the washing and dewatering tub 2. And outer tank 1
Are suspended from the washing machine outer frame 5 by the suspension rods 4. The power switching mechanism 6 is a first brushless DC motor.
The driving force from the motor 7 is decelerated at the time of washing and transmitted to the pulsator 3 at a reduction ratio of, for example, 6: 1, and transmitted to the washing and dewatering tub 2 at a ratio of 1: 1 at the time of dehydration. That is, if the first motor 7 rotates at 600 r / min, the rotation speed of the pulsator 3 is 100 r / min during washing, and the rotation speed of the washing and dewatering tub 2 is 600 r / min during spin-drying. become.

The cover body 8 is provided on the upper part of the outer tub 1 and forms a discharge part for sprinkling water.
Detects the water level in the washing and dewatering tub 2, and a connection portion (trip point) at the lower portion of the outer tub 1 by an air hose 10.
11 and detects the water level by converting the water pressure of the connection portion 11 into an electric frequency (the connection in the middle of the air hose 10 is omitted). The water supply valve 12
Water is supplied into the washing and dewatering tub 2 and a drain valve 1 is provided.
Numeral 3 is for draining the washing water in the outer tub 1.

The pump 14 is driven by a second motor 15 to absorb bath water. The pump 14 is attached to the outer frame 5 of the washing machine and has a water absorbing filter 16 provided at a tip thereof.
7 is connected to a water suction port 18, and a water absorption filter 16 is placed in a bath tub 19. The water supply valve 12 supplies tap water to the washing and dewatering tub 2 through the water inlet 20 and, in the case of using bath water, injects water into the washing and dewatering tub 2 and at the same time from a priming outlet 21 provided in the water inlet 20. The pump 14 is supplied to the pump case of the pump 14 through the priming pipe 23 connected to the priming port 22 in a full state.

The water absorbed by the pump 14 is supplied to the discharge port 2
4 and a water injection guide 26 through a discharge pipe 25.
, And water is poured into the washing and dewatering tub 2 along the water supply guide 26.

As shown in FIG. 2, the control device 27 includes a power switching mechanism 6, a first motor 7, a water supply valve 12, and a drain valve 1.
3. The control means 28 is configured by a microcomputer which controls the operation of the second motor 15 and the like and sequentially controls a series of steps such as washing, rinsing, and spin-drying.

The control means 28 inputs information from an input setting means 29 for setting a driving course and the like, displays the information on a display means 30 based on the information, informs the user, and starts the operation by the input setting means 29. Is set, data from the water level detecting means 9 and the like is input, and the load driving means 31
The washing operation is performed by controlling the operations of the power switching mechanism 6, the water supply valve 12, and the drain valve 13 via the. The control means 28 shown in FIG. 2 controls the power switching mechanism 6 at the time of washing, so that the first motor 7 can selectively drive the washing and dewatering tub 2 and the pulsator 3.

At this time, the rotation control means 32 controls the inverter circuit 36 via the drive circuit 35 based on information from the position detection means 33 of the first motor 7 or the position detection means 34 of the second motor 15. By controlling, the first
The rotation of the motor 7 or the second motor 15 is controlled.

The first motor 7 is a DC brushless motor, not shown, and a stator having three-phase windings,
The rotor comprises a two-pole permanent magnet disposed on a ring, and the stator comprises a first winding 7a forming a three-phase winding;
The second winding 7b and the third winding 7c are wound around an iron core provided in a slot. Similarly, the second motor 15
The first winding 15a and the second winding 1 also constitute three-phase windings.
5b and a third winding 15c.

The inverter circuit 36 is constituted by a switching element (switching means) composed of a parallel circuit of a power transistor (IGBT) and a reverse conducting diode. A series circuit of a first switching element 36a and a second switching element 36b;
A series circuit of 6c and a fourth switching element 36d and a series circuit of a fifth switching element 36e and a sixth switching element 36f are connected in parallel.

Here, both ends of the series circuit of the switching elements are input terminals to which a DC power supply is connected, and output terminals are connected to connection points of two switching elements forming the series circuit of the switching elements. The output terminal is 3
The U terminal, the V terminal, and the W terminal are connected to a positive voltage and a zero voltage, respectively, by connecting to the U terminal, the V terminal, and the W terminal of the phase winding and turning on and off the two switching elements that form a series circuit of the switching elements. The three states of voltage and release are set.

The switching elements are turned on and off by three position detecting means 33 of the first motor 7 comprising a Hall IC.
a, 33b, 33c or the rotation control unit 18 based on information from the three position detection units 34a, 34b, 34c of the second motor 15. Position detecting means 33a, 33b, 33c and position detecting means 34a, 34
Reference numerals b and 29c are disposed on the stator at intervals of 120 electrical degrees so as to face the permanent magnets of the rotor.

As shown in FIG. 3, during one rotation of the rotor, three position detecting means 33a, 33 of the first motor 7 are provided.
Each of b and 33c outputs a pulse at the timing shown in the figure. The rotation control means 32 detects the timing of the arrow shown in FIG. 3 (when the state of any one of the three position detection means has changed), and
Based on the signals of the position detecting means 33a, 33b, 33c
By changing the ON and OFF states of the switching elements 36a to 36f, the U terminal, the V terminal, and the W terminal are set to three states of positive voltage, zero voltage, and release, and the first winding 7a of the stator is
The second winding 7b and the third winding 7c are energized to create a magnetic field and rotate the rotor.

The switching elements 36a, 36c,
Each of 36e is controlled by pulse width modulation (PWM), for example, by controlling the high / low duty ratio at a repetition frequency of 10 kHz to control the number of rotations of the rotor. Each time the state of any one of the three position detection means 33a, 33b, 33c of the motor 7 changes, the cycle is detected, the rotation speed of the rotor is calculated from the cycle, and switching is performed so that the rotation speed becomes the set rotation speed. The elements 36a, 36c and 36e are PWM-controlled. Also, the second motor 15 is controlled in the same manner as described above.

Whether the first motor 7 or the second motor 15 is controlled is switched by the control circuit 28 by the switch circuit 37.

The resistor 38 detects current, and the resistor 3
8, the input current value of the inverter 36 is detected. The commercial power supply 39 is a diode bridge 4
0, a choke coil 41 and a smoothing capacitor 42, which are connected to an inverter 36 via a DC power converter. However, this is an example, and the configuration of the first motor 7 and the configuration of the inverter 36, etc., configured by DC brushless are not limited thereto.

The rotation control means 32, as shown in FIG.
Revolution detecting means for inputting a signal from the position detecting means 33 of the first motor 7 or the position detecting means 34 of the second motor 15 to detect the rotational speed of the first motor 7 or the second motor 15 A rotation speed setting means 32b for setting the rotation speed of the first motor 7 or the second motor 15;
A rotation speed comparison unit 32c that compares the rotation speed detected by the rotation speed setting unit 32b and the rotation speed detection unit 32a, a rotation speed change amount detection unit 32d that detects a change amount of the rotation speed,
Based on the input from the rotation speed comparison means 32c and the rotation speed change amount detection means 32d, energization of the switching elements 36a, 36c, 36e to make the rotation speed of the first motor 7 or the second motor 15 approach the set rotation speed. An operation amount determining means for determining an operation amount of the ratio;
e after switching elements 36a, 36
a power ratio setting means 32f for setting the power ratio of the first and second motors 36 and 36e and outputting the same to the drive circuit 35; and a switching element 36 gradually increased in accordance with the time elapsed from the start of the first motor 7.
a, 36c, and 36e, and a duty ratio storage means 32g that outputs the duty ratio to the drive circuit 35.

When the first motor 7 or the second motor 15 is started, the rotation control means 32
Three position detecting means 33a, 33b, 33c or three position detecting means 34a, 34b, 34 of the second motor 15
The number of times the state of any one of the signals c changes is up to three times, that is, the first motor 7 or the second motor 15
Until the rotation, the output signal of the duty ratio storage means 32g,
Thereafter, by driving the drive circuit 35 with the output signal of the duty ratio setting means 32f, the switching elements 36a,
The energization ratio of 36c and 36e is controlled.

FIG. 5 shows the state of rotation of the first motor 7 during washing, in which the first motor 7 is driven at 600 r / min.
Pulsator 3 is 100 r / mi
The normal rotation and reversal are repeated 1.6 seconds on and 1 second off to reach n.

The operation of the above configuration will be described with reference to FIGS. 6 and 7. After the laundry and the detergent are put into the washing and spin-drying tub 2, the water supply valve 12 is operated to supply tap water to the pump 14 from the priming port 22 (so-called priming) (step 51 in FIG. 7). The pump 14 is operated by driving the pump 15 (step 52), and water is supplied into the washing and dewatering tub 2 by the pump 14. Step 51
Is not performed when the inside of the pump case of the pump 14 is full, such as when the pump is used continuously.

At this time, the control means 28 executes a process of stopping the second motor 15 and rotating the first motor 7 when the water level detected by the water level detection means 9 is lower than the predetermined water level. . That is, FIG.
(A), the level of the washing and dewatering tank within 2 second water level H ₂ (e.g., water column 50 mm) until the time t ₁ to reach, as shown in FIG. 6 (b), washing and dewatering The rotation speed of the water tank 2 is set to 0 r / min.

After time t ₁ when the water level detecting means 9 detects the second water level H ₂ (step 53), the control means 28
Between times t ₂ (e.g., 60 seconds) the second motor 1
5 is stopped and the pump 14 is turned off (step 54) to stop water absorption. Then, the first motor 7 is driven to set the washing / dehydrating tub 2 at the set rotation speed N ₁ (for example, 70 r / min).
And the first motor 7 is temporarily stopped after a set time (step 55).

Thereafter, the first motor 7 is driven again, and after the time t ₂ until the time t ₃ (for example, 30 seconds), FIG.
As shown in (c), the pulsator 3 is set to the set rotation speed N.
₂ (for example, 90 r / min), and the first motor 7 is stopped after a set time (step 56). However, the higher the predetermined water level Hs, rotation drive time of the pulsator 3, a time t ₂ subsequent to lengthened between until time t ₃ (e.g.,
The pulsator stirring time is such that the predetermined water level Hs is 150 mm
For 30 seconds, and 45 seconds for a 200 mm water column).

Subsequently, the pump 14 is turned on by driving the second motor 15 (step 57), and in step 58, the water level detecting means 9 detects that the water level in the washing and dewatering tub 2 has reached the predetermined water level. If so, the second motor 15 is turned off in step 59, and the water supply process by the pump 14 ends.

As described above, in the water supply process, the first motor 7
When the second motor 15 is driven by the inverter circuit 36, the inverter circuit 36 is controlled by the control means 28, and the second motor 15 is driven to drive the pump 14, the second At the water level H _2, the second motor 15 is stopped, and the washing and spin-drying tub 2 is set at the set rotation speed N _1.
As shown in FIG. 8, with the gentle rotation of the washing and dewatering tub 2, a gentle centrifugal force acts on the washing water to slightly lower the central part to promote the circulation of the washing water, so that the washing water is supplied. The solubility of the obtained detergent can be improved, which can contribute to the improvement of the cleaning performance in the subsequent steps.

Further, the washing water can be evenly sprinkled on the laundry so as to act on the dirt, so that the washing unevenness of the laundry can be reduced. Further, by driving the second motor 15 via the inverter circuit 36, noise can be reduced. In addition, when the laundry is sufficiently wet and the cloth is small, the washing and dewatering tub 2 is _first raised to the set rotation speed N1, so that the frictional force between the laundry and the inner lid is reduced, and Damage can be reduced.

In the present embodiment, when the pump 14 is operated to supply bath water or the like, the second water level lower than the predetermined water level is lowered.
In the water level H _2, stops the second motor 15, but is configured to rotate the first motor 7, a plurality of water level lower than a predetermined water level, it stops the second motor 15 Alternatively, the first motor 7 may be rotated, and the same operation and effect can be obtained.

Also, by rotating the washing and dewatering tub 2, a phenomenon occurs in which the washing water between the outer tub 1 and the washing and dewatering tub 2 rises by the action of centrifugal force. Whether to sprinkle water from inside the dewatering tank 2 from above may be appropriately selected, and there is no substantial difference in the effects of the present invention.

(Embodiment 2) The control means 28 shown in FIG.
By controlling the first motor 7 at the time of washing, it is configured such that the higher the water level, the higher the number of rotations in the rotation driving process of the pulsator 3 at the time of water supply. Other configurations are the same as those in the first embodiment.

The operation of the above configuration will be described with reference to FIG. After the laundry and the detergent are put into the washing and dewatering tub 2, the water supply valve 12 is operated to supply tap water to the pump 14 from the priming port 22, so-called priming, and the second motor 15 is driven to drive the pump 14. Is operated, and water is supplied into the washing / dewatering tub 2 by the pump 14.

At this time, as shown in FIGS. 9 (a), 9 (b) and 9 (c), the water level in the washing and dewatering tub 2 by supplying the bath water reaches the first water level H ₂ (for example, a water column of 50 mm). After the time t ₁ , the washing and spin-drying tub 2 is rotated at a set rotation speed N ₁ (for example, 70 r / min) for t ₂ (for example, 60 seconds), and after time t ₂ until t ₃ (for example, 70 r / min). For example, for 30 seconds), the pulsator 3 is rotated at a set rotation speed N ₂ (for example, 90 r).
/ Min).

However, the first water level H_Two(For example, water column 5
0 mm) higher water level H₁(For example, water column 100mm)
At the time t_FourHereafter, t_FiveUntil (for example,
Set the washing and dewatering tub 2 to the set rotation speed N for 60 seconds.₁(For example,
70 r / min) at time t_FiveHereafter, t₆For up to
During the period (for example, for 30 seconds), the pulsator 3 is set to the set rotation speed N.
_Three(For example, at 120 r / min).

As described above, in the above process, in the water levels H ₂ and H ₁ lower than the predetermined water level Hs, the higher the water level for driving the pulsator 3 to rotate, the higher the rotation speed N ₂ of the pulsator 3 becomes N ₃
When the water level is low, the laundry is slowly rotated when the water level is low, so that the frictional force on the surface of the laundry is reduced and the damage to the laundry can be reduced.

(Embodiment 3) The control means 28 shown in FIG.
In the rotation driving process of the washing and dewatering tub 2 and the pulsator 3 at the time of water supply, the higher the predetermined water level, the more the stages of the lower water level. Other configurations are the same as those in the first or second embodiment.

In the above process, in the first or second embodiment,
Similarly, the higher the predetermined water level Hs, the larger the amount of detergent to be added. Therefore, in order to maintain the solubility of the detergent at each predetermined water level, the higher the predetermined water level, the lower the water level and the lower the washing and dewatering tub 2.
By increasing the number of steps for rotating the pulsator 3 and the pulsator 3, the solubility of the detergent at each predetermined water level can be made the same, so that the cleaning performance can be maintained and the detergent residue can be reduced.

[0050]

As described above, according to the first aspect of the present invention, a washing and dewatering tub for accommodating laundry and a pulsator rotatably disposed at the inner bottom of the washing and dewatering tub. And a first for rotating and driving the washing and dewatering tub and the pulsator.
Motor, a second motor for driving a pump for supplying bath water and the like into the washing and dewatering tub, an inverter circuit for driving the first motor and the second motor, and a water level of the washing and dewatering tub Water level detection means, and a control means for inputting the output of the water level detection means and controlling the inverter circuit, wherein the control means operates the pump to supply bath water or the like. At least one stage of water level lower than the predetermined water level detected by the water level detection means, after stopping the second motor and rotating the first motor to rotate the washing and dewatering tub The pulsator is driven to rotate, and the higher the predetermined water level, the longer the stirring time in each stage of the low water level.Therefore, in the water supply stroke of supplying bath water, etc. by a pump, the water level is lower than the predetermined water level. The washing water can act on the soil of the laundry at the water level, the water supply time can be effectively used for removing the soil of the laundry, and the washing and dewatering tub and the pulsator are rotated by the first motor. By making the washing water act evenly on the dirt on the laundry, the washing power can be ensured and the washing unevenness can be reduced, and the operating noise of the pump can be reduced by driving the second motor for driving the pump by the inverter circuit. Can be reduced to reduce noise. In addition, since the pulsator can be rotated after the washing water has sufficiently acted on the laundry, the detergent concentration of the washing liquid can be increased by stirring the detergent earlier, thereby improving the effect of removing dirt. it can.

According to the second aspect of the present invention, in the pulsator rotation drive process, the higher the water level, the higher the number of rotations. Frictional force is reduced, and damage to the laundry can be reduced.

According to the third aspect of the present invention, in the washing and dewatering tub and the pulsator rotation drive process, the higher the predetermined water level, the more the low water level is increased. Therefore, in order to maintain the solubility of the detergent at each predetermined water level, the higher the predetermined water level, the higher the rotation of the washing and dewatering tub and the pulsator, so that the solubility of the detergent at each predetermined water level is reduced. The same can be achieved, and the cleaning performance can be maintained and the detergent residue can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a washing machine according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram of the washing machine in a partially blocked state;

FIG. 3 is a timing chart showing the operation of the inverter circuit of the washing machine.

FIG. 4 is a block diagram of a rotation control unit of the washing machine.

FIG. 5 is a timing chart showing a rotation state of a motor during washing of the washing machine.

FIG. 6 is an operation timing chart of the washing machine.

FIG. 7 is a flowchart showing the operation of the main part of the washing machine.

FIG. 8 is a longitudinal sectional view showing an operation state of the washing machine.

FIG. 9 is an operation timing chart of the washing machine according to the second embodiment of the present invention.

FIG. 10 is a longitudinal sectional view of a conventional washing machine.

[Explanation of symbols]

 2 Washing and dewatering tub 3 Pulsator 7 First motor 9 Water level detecting means 14 Pump 15 Second motor 28 Control means 36 Inverter circuit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3B155 AA10 AA17 BA03 BB08 CB42 KA19 LA02 LA11 LA12 LA14 LB02 LB18 LB31 LC14 MA01 MA06 MA07 MA09

Claims (3)

[Claims] 1. A washing and dewatering tub for accommodating laundry, a pulsator rotatably disposed at an inner bottom of the washing and dewatering tub, and a first rotator driving the washing and dewatering tub and the pulsator.
Motor, a second motor for driving a pump for supplying bath water and the like into the washing and dewatering tub, an inverter circuit for driving the first motor and the second motor, and a water level of the washing and dewatering tub Water level detection means, and a control means for inputting the output of the water level detection means and controlling the inverter circuit, wherein the control means operates the pump to supply bath water or the like. At least one stage of water level lower than the predetermined water level detected by the water level detection means, after stopping the second motor and rotating the first motor to rotate the washing and dewatering tub A washing machine in which a pulsator is driven to rotate, and the higher the predetermined water level, the longer the stirring time in each stage of a low water level. 2. The washing machine according to claim 1, wherein the higher the water level, the higher the number of rotations in the pulsator's rotation drive stroke. 3. The washing machine according to claim 1, wherein in the washing and dewatering tub and the pulsator rotation drive step, the higher the predetermined water level, the more the number of low water levels.