JP3152899B2 - Washing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine in which a drive form of a stirring body and a drive form of a dewatering tub are improved.

[0002]

As is well known, in a washing machine for both dehydration and washing, a stirrer is provided inside a rotary tub serving as both a dehydration tub and a washing tub, and a motor for driving the stirrer and the rotary tub is provided. Also, a clutch or the like is provided for switching between a case where the rotational force of the motor is transmitted only to the stirring member and a case where the rotation force is transmitted to both the stirring member and the rotary tank. Then, in the washing operation (detergent washing or rinsing), the motor drives the stirrer to rotate in the forward and reverse directions, and in the dehydration operation, the motor rotates the rotary tank and the stirrer.

There are various types of clothes to be washed, and delicate items include lingerie made of silk, new synthetic fiber, nylon, and the like, sweaters made of wool, acrylic, fleece, and the like, cardigans, and the like. There is. A so-called Y-shirt or the like made of cotton or the like is known to be distinguished from delicate clothing.

[0004] However, in the conventional washing machine, it has been a problem to be solved that the clothes are easily damaged or shrunk or the wrinkles are easily generated. As a countermeasure, the rotation speed of the stirrer is reduced during the washing operation, or the dehydration time during the dehydration operation is shortened, but the cleaning effect is not improved, or the shape is lost during the dehydration operation. Occasionally, wrinkles or wrinkles could still occur, which was not satisfactory.

The present invention has been made in view of the above circumstances, and a first object is to improve the washing effect while preventing a cloth from being damaged or shrinking, and a second object is to provide a dehydrating operation. This is intended to prevent the occurrence of shape collapse and wrinkles at times.

[0006]

Means for Solving the Problems Claims 1 to 4
The present invention has been made to achieve the first object. The invention according to claim 1 includes a stirrer provided in a tank, a motor for rotationally driving the stirrer, and rotating and stopping the motor in one direction during a washing operation.
Repeatedly, and in each drive period of the motor,
Combination of high-speed and low-speed rotation of motor
And a motor drive control means for controlling the drive of the motor.

In this configuration, when the garment is a sweater or cardigan made of wool, acrylic, fleece or the like (when the garment is easy to float on water), or when the garment is not yet sufficiently immersed in water, The cleaning effect can be improved while preventing cloth damage and cloth shrinkage. In other words, when washing these clothes, since they are not sufficiently immersed in water, simply turning the rotation of the agitator, that is, the rotation of the motor, to a predetermined rotation speed can prevent damage to the clothes and shrinkage of the clothes. The cleaning effect cannot be improved. However, in the above configuration, each time of the motor
During the driving period, the motor rotation speed is changed to high speed rotation and low speed rotation.
Drive control of the motor so as to be combined with
, Sinking clothing that is easily lifted by high-speed rotation
Can be expected (action approaching the stirrer) and low speed
Prevents fabric damage and shrinkage of clothing without rotation sinking
While the washing effect by the stirring body is fully exhibited
Becomes

According to a second aspect of the present invention, there is provided a stirrer provided in a tank, a motor for driving the stirrer to rotate, and for rotating and stopping the motor during a washing operation .
And in each drive period of the motor
, Gradually increase the motor rotation speed,
Rise, fast fall, gentle fall
And motor drive control means for controlling the drive of the motor.

In this configuration, when the garment is a lingerie made of silk, new synthetic fiber, nylon, or the like, the cleaning effect can be improved while preventing the cloth from being damaged or shrunk. That is, these garments are not particularly easily floated in water in the tank. Also, since the amount of cloth is not large, it is often washed at a low water level. If the rotation of the stirrer, that is, the rotation of the motor, is simply increased to a predetermined rotation speed (a rotation speed at which no damage or shrinkage of the cloth occurs), the clothes remain stationary at the beginning of the driving period. Or, since it is in a state close to this, the relative speed difference between the agitator and the clothes is large, and there is a concern that cloth damage may occur. Conversely, the same can be said for the case where the stirring body is stopped, and when the stirring body is stopped at a stretch from the predetermined rotation speed.

However, in the above configuration, during each drive period of the motor, the rotational speed of the motor is gradually increased.
By starting and starting quickly , the rotation speed can be increased without suddenly increasing the relative speed difference between the clothes and the stirrer, and the rotation speed of the motor can be increased.
The fast and gentle falling allows the rotating speed to fall without suddenly increasing the relative speed difference between the clothes and the agitator, preventing the clothes from being damaged or shrinking. While improving the cleaning effect.

According to a third aspect of the present invention, there is provided a stirrer provided in a tank, a motor for rotationally driving the stirrer, and in a washing operation, the motor is rotationally driven in one direction and stopped.
Repeatedly rotating and stopping in the other direction,
During the one-way rotation of the motor during
The rotation speed is a combination of high-speed rotation and low-speed rotation,
During the driving period of each rotation in the other direction, the rotation speed of the motor
And motor drive control means for controlling the drive of the motor so that the motor rotates at the low speed .

In this configuration, the clothes can be washed evenly by rotating the motor alternately in one direction and the other direction. And one of each time of said motor
The rotation speed of the motor during high-speed rotation
As described above, when the clothing is a sweater or cardigan made of wool, acrylic, or fleece, as described above, the cleaning effect is improved while preventing the fabric from being damaged or shrinking. I can plan. In addition, it is possible to form a water flow that causes clothing to float by low-speed rotation in the other direction, and suitable drive control is achieved.

According to a fourth aspect of the present invention, there is provided a stirrer provided in a tank, a motor for rotationally driving the stirrer, and rotating and stopping the motor during a washing operation .
Are repeated, and the motor is driven for each driving period.
In other words, at least during the first drive period,
Combination of high-speed rotation and low-speed rotation, driving other times
During the period, the motor speed gradually increases gradually.
Fast rise, fast fall, slow fall
And a motor drive control means for controlling the drive of the motor.

In the above configuration, at least the first drive
In the period, the rotation speed of the motor is changed between high speed rotation and low speed rotation.
Since a combination, as in the case of the invention of claim 1, submerged quickly water float easily clothes in water sufficiently becomes possible to contain water, also at other times of the driving period
, Gradually increase the motor rotation speed,
The rising effect , the fast falling, and the gentle falling can improve the cleaning effect while preventing the cloth from being damaged or shrunk as in the case of the second aspect of the present invention.

The fifth and sixth aspects of the present invention have been made to achieve the second object .

[0016]

According to a fifth aspect of the present invention, there is provided a dehydrating tub, a motor for rotating the dehydrating tub, and a motor for rotating the dehydrating tub at a time to a rotation speed at which water is discharged from the dehydrating tub. Thereafter, a motor drive control means for controlling the drive so as to gradually increase the rotation speed of the motor to a predetermined rotation speed is provided.

In this configuration, the garment can be dehydrated so as not to lose its shape. That is, according to the investigation by the inventor, the following has been found. In order to dehydrate clothes without losing shape, it is preferable to reduce the external force (centrifugal force) per unit time. For this purpose, the rotation speed of the dehydration tub may be reduced, but in this case, water is not easily dehydrated from the clothes, and it takes time to obtain a desired degree of dehydration. On the other hand, if the spin-drying speed is increased, the time required for spin-drying is shortened, but the above-mentioned mold collapse occurs.

However, in the above configuration, since the motor is started at a stroke to the rotation speed at which water starts to be discharged from the dehydration tub, the dehydration tub is rotated to the minimum rotation speed at which the dehydration action can be obtained, and the clothes lose shape. The dehydration effect can be improved in a short period of time without causing water.
Then, since the rotation speed of the motor is gradually increased to the predetermined rotation speed, a large centrifugal force is not suddenly applied, and the dewatering effect can be improved without causing the clothing to lose its shape.

According to a sixth aspect of the present invention, there is provided a dehydrating tub, a motor for rotating the dehydrating tub, and counting a dehydrating time from a point in time when a rotation speed at which water starts to be discharged from the dehydrating tub during a dehydrating operation. A dehydration time measuring means for performing the dehydration operation, and an operation control means for controlling the dehydration operation based on the count time of the dehydration time measuring means.

For example, the time for the dehydration operation is set according to the amount and type of clothes, and the time for which the fabric is easily damaged or loses its shape is often set to the minimum time within a range where the dehydration effect can be expected. . By the way, the start of the time measurement of the dehydration operation is generally adjusted to the start time of the motor. However, according to the investigation by the present inventors, the following has been found. That is, if the dehydration tub is of the pumping type, even if the dehydration tub starts rotating, up to a certain rotation speed,
Water in clothes is not dehydrated. That is, until the pumping power by the centrifugal force exceeds the weight of the water in the garment, the water stays in the tank, and the water is not substantially dehydrated. Therefore, there is a possibility that the dehydration setting time and the time when dehydration actually starts and ends deviate, resulting in insufficient dehydration. However, in the above configuration, the dehydration time is counted from the time when the rotation speed at which water starts to be released from the dehydration tank is counted, so that the time can be appropriately measured, and
An improvement in the accuracy of dehydration operation control can be expected.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First,
In FIG. 2 showing the entire configuration of the fully automatic washing machine, a water receiving tub 2 which is an outer tub for receiving dewatered water is elastically supported via an elastic suspension mechanism 3 in an outer box 1 which is a main body of the washing machine. ing. Inside the water receiving tank 2, a rotating tank 4 which is also used as a washing tank and a dewatering tank is rotatably arranged. A stirring body 5 is rotatably disposed at the inner bottom of the rotating tank 4.

The rotary tank 4 has a tank main body 4a in the form of a tapered cylinder slightly expanding upward, and an inner cylinder 4b provided inside the tank main body 4a to form a water passage gap.
And a balance ring 4 provided at the upper end of the tank body 4a.
c. When the rotary tub 4 is rotationally driven, the water inside rises along the inner peripheral surface of the tank main body 4a by centrifugal force, and the dewatering hole 4 formed in the upper part of the tank main body 4a.
d and is discharged into the water receiving tank 2.
That is, the rotary tank 4 is of a pumping type. A water inlet 4e is formed at the bottom of the tank body 4a of the rotary tank 4.

As shown in FIG. 3, the agitator 5 has a main body 5a substantially in the shape of a disk, and is formed by forming six raised portions 5b radially on the main body 5a. The protruding portion 5b is formed in a slightly curved shape when viewed in a plan view. When the protruding portion 5b is rotated in the direction of arrow A, the concave side 5c of the protruding portion 5b acts particularly to remove water in the tank. FIG.
As shown in FIG. 6 (a), when it is pulled into the center and rotated in the direction of arrow B (reverse direction), the convex side 5d of the raised portion 5b acts particularly to remove water in the tank as shown in FIG. The water is pushed upward from the outside as shown in).

A drain port 6 is formed at the right end of the bottom of the water receiving tank 2 in FIG. 2, and the drain port 6 is provided with a drain valve 7 and a drain hose 8 is connected thereto. . The drain port 6 is provided with a drain passage 2 formed in the water receiving tank 2.
a and communicates with the water inlet 4e. The drain valve 7 is a valve that is opened and closed by a drain valve motor 9 (see FIG. 5) as drain valve driving means, and is configured as a so-called motor type drain valve. The drain valve motor 9 includes:
For example, it is constituted by a geared motor. In the drain stroke in which the drain valve motor 9 is driven to open the drain valve 7, the water in the rotary tub 4 is supplied to the water passage 4e, the drain passage 2a,
Water is drained through a drain port 6, a drain valve 7, and a drain hose 8.

Further, an auxiliary drain port 10 is formed at the left end of the bottom of the water receiving tank 2 in FIG. 2, and the auxiliary drain port 10 is connected to a drain hose 8 via a connecting hose (not shown). . The auxiliary drain port 10 is for draining water that has been dewatered from its upper part and discharged into the water receiving tank 2 when the rotary tub 4 is dewatered and rotated.

At the outer bottom of the water receiving tank 2, a mechanism base 11
Is installed. A shaft support cylinder 12 is formed at the center of the mechanism base 11 so as to extend in the vertical direction. A hollow tank shaft 13 having an upper end connected to the rotary tank 4 is rotatably inserted into and supported by the shaft support cylinder 12. A stirring shaft 14 having a stirring body 5 connected to the upper end is rotatably inserted and supported inside the tank shaft 13.

The mechanism base 11 is provided with, for example, an outer rotor type brushless motor 15 which constitutes a washing machine motor.
The lower end of the stirring shaft 14 protruding downward from is connected. Therefore, when the brushless motor 15 starts, the agitator 5 rotates integrally with the rotor.

Although not shown, a clutch is provided at the lower end of the tank shaft 13. This clutch engages and disengages the tank shaft 13 and the rotor of the brushless motor 15. During the spin-drying operation, the tank shaft 13 is connected to the rotor of the brushless motor 15 so that the rotary tank 4 is integrated with the stirring body 5. In the washing operation, the connection is released so that only the stirring member 5 is rotationally driven by the rotor.

An operation panel 16 shown in FIG. 4 is mounted on a front portion of the upper cover 1a on the outer box 1. The operation panel 16 includes a power on / off switch 17, a start / stop switch 18 for temporary stop, a dehydration time setting switch 19, a rinsing number setting switch 20, a washing time setting switch 21, a reservation setting switch 22, course selection switches 23 to 32, A water flow setting switch 33, a water level setting switch 34, and a bath water pump setting switch 35 are provided, and various display units are provided.

Of the course selection switches 23 to 32, in particular, the course selection switch 23 is a switch for selecting a dry course, the course selection switch 24 is a switch for selecting a lingerie course, and the course selection switch 25 is a Y-shirt. This is a switch for selecting a course.

FIG. 5 shows the electrical configuration. The electrical configuration of the drive control of the brushless motor 15 will be described. A DC power supply circuit 37 for converting the DC power supply to a DC power supply 36 is connected to the AC power supply 36. The output side of the DC power supply circuit 37 is connected to a switching device such as an IGBT. An inverter main circuit 38 in which the elements are connected in a three-phase bridge is connected.

On the output side of the inverter main circuit 38,
The stator coil 15a of the brushless motor 15 is connected. The brushless motor 15 includes Hall ICs 39a to 39c as position detecting elements.
“a” also serves as a rotation speed detecting means 40 for detecting the rotation speed of the rotating tub 4. Microcomputer 41
Has functions as motor drive control means for controlling the drive of the brushless motor 15 and operation control means for controlling the dehydration operation.

The inverter drive control circuit 42 controls the switching elements of the inverter main circuit 38 on and off based on a motor operation command from the microcomputer 41, thereby operating the brushless motor 15 in a predetermined manner. The microcomputer 41 is provided with a water level sensor 43 for detecting a water level in the rotary tub 4, signals from the switches 17 to 35, and a drain valve motor 9 and a water supply valve 44 for supplying water to the rotary tub 4. In response, a control command signal is output.

The dry course, lingerie course and Y-shirt course are suitable for washing clothes as shown in Table 1 below.
Is controlled as follows.

[0036]

[Table 1]

When the dry course is selected and the start switch 18 is operated, during the washing operation, the microcomputer 41 controls the drive of the motor 15 as shown in FIG. That is, the stirrer 5 is moved in the direction of arrow A (FIG.
And FIG. 6 (a)).
Driving and stopping are repeated so that 5 rotates in one direction. In the driving period Tk, the first period Tk1 is the motor 15
Rotation speed of, for example, 150 r. p. m. This rotation speed is 30 r. p. m. In the subsequent period Tk2, 30r.
p. m and the drive period Tk
Is stopped when elapses.

During the dehydration operation in the dry course, the microcomputer 41 controls the motor 15 as shown in FIG. That is, the rotation of the motor 15 is started at a stretch to a rotation speed at which water is started to be released from the rotary tank 4 (this is approximately 400 rpm).
5 is a predetermined rotation speed, for example, 600 r. p. m.

As described above, in the dry course, during the washing operation, when the clothes are sweaters or cardigans made of wool, acrylic or fleece (when the clothes are easy to float on water), or when the clothes are still sufficiently exposed to water. When not soaked, the cleaning effect can be improved while preventing the cloth from being damaged or contracted. That is, when these clothes are washed, since they are not sufficiently immersed in water, the rotation of the stirring body 5, that is, the rotation of the motor 15 is simply performed at a predetermined rotation speed of 30 r. p. Even if m (rotational speed capable of preventing cloth damage and having cleaning power), the cleaning action does not sufficiently spread.

However, according to the embodiment, each of the motors 15
In the first driving period Tk, the first period Tk1 is the motor 1
5 is higher than the predetermined rotation speed (high speed rotation and
) , An action of sinking the clothes that easily floats (an action of approaching the agitator) can be expected, and in the subsequent period Tk2, the motor 15 is rotated at a predetermined rotation speed with little damage to the cloth and with a detergency (low-speed rotation). ) , The washing effect of the stirring body 5 is sufficiently exhibited while preventing the cloth from being damaged or shrunk.

In the above-mentioned dry course, during the dehydration operation, the clothes can be dehydrated so as not to lose their shape. In other words, to dehydrate clothing without losing its shape,
The dewatering rotation speed of the rotating tub 4 may be reduced (that is, the rotational centrifugal force is reduced), but in this case, water is not easily dewatered from the clothes, and it takes time to obtain a desired degree of dehydration.

However, in the above embodiment, the rotating tank 4
Rotation speed (400 rpm) at which water starts to be released from
Since the motor 15 is started at a stroke, the rotating tub 4 is rotated to the minimum rotation speed in a range where the dewatering action can be obtained, so that the dewatering effect can be improved without losing the shape of the clothes. Then, since the rotation speed of the motor 15 is gradually increased to a predetermined rotation speed (600 rpm), a large centrifugal force is not suddenly applied, and the dewatering effect can be obtained without causing the clothing to lose its shape. Can be raised.

When the lingerie course is selected, the microcomputer 41 intermittently controls the driving of the motor 15 in the directions of arrows A and B during the washing operation as shown in FIG. Moreover, the driving periods Ta, Tb
At 20 r. p. m and then slowly rise to 30r. p. m, and then increase the rotation speed of the motor 15 to 20 r. p. m
Fall quickly to 0r. p. The drive of the motor 15 is controlled so as to gradually fall to m (stop). In this case, the maximum rotation speed is 30 r. p. m is a rotation speed within a range that does not cause damage to the cloth and that also has a detergency. During the dehydration operation in this lingerie course, the rotation speed of the motor 15 is controlled in the same manner as in the above-described dry course (FIG. 7).

As described above, when the garment is lingerie made of silk, new synthetic fiber, nylon, or the like, the washing effect can be improved while preventing the cloth from being damaged or shrinking during the washing operation. That is, these garments do not particularly easily float on the water in the rotating tub 4. Also, since the amount of cloth is not large, it is often washed at a low water level. The rotation of the agitator 5, that is, the rotation of the motor 15, is simply performed at a predetermined rotation speed of 30 r. p. m (rotational speed that does not cause cloth damage or cloth shrinkage), the garment is in a stationary state or a state close to it in the first time period of the driving periods Ta and Tb. There is a large relative speed difference between the clothes and the clothes, and there is a fear that cloth damage may occur.

Conversely, when the stirring member 5 is stopped, the predetermined rotation speed 30 r. p. The same can be said for a case where the operation is stopped at a stretch from m. However, according to the above-described embodiment, during the driving periods Ta and Tb of the motor 15,
By increasing the rotation speed of the motor 5 slowly and then quickly, the rotation speed can be increased without suddenly increasing the relative speed difference between the clothes and the stirring body 5, and then the rotation of the motor 15 is started. By decreasing the speed quickly and then slowly, the rotation speed can be decreased without suddenly increasing the relative speed difference between the clothes and the stirring body 5, and the rotation speed of the motor 15 can be reduced at a stretch. Unlike the case of starting up and falling down at once, the cleaning effect can be improved while preventing the cloth from being damaged or contracted.

When the Y-shirt course is selected, the microcomputer 41 intermittently controls the drive of the motor 15 in the direction of arrow A and the direction of arrow B during the washing operation, as shown in FIG. In this case, the rotation speed in each driving period is made different. That is, the first drive period Ta1 (rotation in the direction of arrow A) and Tb1 (rotation in the direction of arrow B)
, The motor 15 is set to 170 r. p. m in the next driving periods Ta2 and Tb2.
p. m, and the next drive periods Ta3 and Tb3
At 150 r. p. Start up to m. Thereafter, this control is repeated.

Further, during the spin-drying operation in the Y-shirt course, the microcomputer 41 performs a plurality of times, for example, four times, immediately after the motor 15 is started up to the set rotation speed, as shown in FIG. ing. In this case, the set rotation speed is sequentially increased in the first, second, and third times, and 900 r. p. m. The rate of rise of the rotation speed is approximately 30 r. p. m / sec, and the fall rate is 60 to 45 r. p. m / sec.

As described above, during the washing operation of the Y-shirt course, as shown in FIG. 9, the drive of the motor 15 is controlled so that the motor 15 is intermittently driven and has a different rotation speed in each drive period. You can add strength,
Unlike the case where the detergency is uniformly strong, it can be satisfactorily washed while preventing damage to the cloth.

Also, during the dehydration operation of the Y-shirt course, the clothes can be dehydrated without causing wrinkles. That is, it is considered that the wrinkles of the garment are caused by the fact that the yarn of the garment fiber is not recovered while being deformed by the rotational centrifugal force. For this reason, the longer the spin-drying time, the more easily wrinkles occur. However, according to the above embodiment,
Since the motor 15 is immediately lowered after being raised to the set rotational speed a plurality of times, unlike the case where the motor 15 is continuously rotated, the time during which the rotational centrifugal force acts is short, and wrinkles are less likely to occur. Become. Since the rotation speed of the motor 15 is increased and decreased a plurality of times, it is possible to prevent the dehydration effect from being reduced.
Further, since the set rotation speed is sequentially increased (because the rotation speed is initially low), there is little mold deformation.

FIG. 11 shows a second embodiment of the present invention. This embodiment differs from the first embodiment in the drive control mode during the washing operation in the dry course. That is,
The motor 15 during washing operation in one direction and the other direction (arrow A direction and the arrow B direction shown in FIG. 3) as well as rotary drive alternately first period in the driving period Ta in one direction rotation of the each time the motor 15 at a predetermined rotational speed of 30 r. p. m (high speed rotation) and then 30r. p. reduced to m (a low-speed rotation) to drive control so as, 30r rotational speed of the motor 15 in the driving period Tb in the other direction rotation each time. p. m (the low speed
And so as to drive control so that the rolling).

According to the second embodiment, the clothes can be washed evenly by rotating the motor 15 alternately in one direction and the other direction. In the first drive period Ta in the one-way rotation, the rotation speed of the motor 15 is set to 150 r. p. m (predetermined rotation speed of 30r.
p. m) and then 30r. p. m, the cleaning effect can be improved while preventing the cloth from being damaged or shrunk as described above. In particular, a configuration in which the stirrer 5 forms a water flow that sinks clothes by rotating in one direction (rotation in the direction of arrow A), and forms a water flow that lifts clothes by rotating in the other direction. In the case of, suitable drive control is performed.

FIG. 12 shows a third embodiment of the present invention. This embodiment is different from the first embodiment in the drive control mode during the washing operation in the dry course. That is,
In the third embodiment, the motor 15
Are intermittently driven to rotate, and during the first and second driving periods, the same control as the driving control mode of the first embodiment shown in FIG.
Rotation speed of 150 r. p. m and then 30r.
p. m). In the third and subsequent drive periods, the same control as in the drive control mode of FIG. 8 in the first embodiment (the motor 15 is started slowly and then quickly started, and then the motor 15 The drive is controlled so that it falls quickly and then falls slowly.

According to the third embodiment, in the first and second driving periods, the motor 15
Rotation speed of 30 r. p. m and then 30r.
p. m, the clothing that easily floats on the water can be quickly submerged in the water to sufficiently contain the water, and in the subsequent driving period, the motor 15 starts up slowly after slowly starting the rotation speed, and Thereafter, since the rotation speed of the motor is rapidly lowered and then slowly lowered, the cleaning effect can be improved while preventing the cloth from being damaged or contracted. The above-described first and second control operations may be performed only at the beginning.

FIGS. 13 and 14 show a fourth embodiment of the present invention. This embodiment is characterized in the form of measuring the dehydration time. That is, in this embodiment, the spin-drying time is counted from the time when the rotation speed (400 rpm) at which the water starts to be released from the rotary tub 4 is reached.
That is, for example, the dehydration time is set to Dh. The microcomputer 38 starts the dehydration operation at the timing t1 (the rotation drive of the motor 15 starts).
When the rotation speed of the motor 15 is 400 r. p. When the count reaches m, counting for the set dehydration time Dh is started, and when the count time reaches Dh, the motor 15 is controlled to stop. In this case, the set dehydration time D
h is counted up when 800r. p. The degree of increase in the rotational speed is set in advance so as to be m.

In general, the start of the time measurement of the dehydration operation is generally set at the time when the motor 15 is started. However, according to the investigation by the present inventors, the following has been found. That is, if the rotary tank 4 is of the pumping type, the rotary tank 4
Even when is started to rotate, the water in the clothes is not dehydrated until a certain rotation speed. In other words, until the pumping power due to the centrifugal force exceeds the weight of the water in the clothes, the water H is not discharged from below or from above, as schematically shown in FIG. And the state is substantially not dehydrated. Therefore, there is a possibility that the dehydration setting time and the time when dehydration actually starts and ends deviate, resulting in insufficient dehydration. However, in the fourth embodiment, the dewatering time is counted from the time t2 when the rotation speed at which the water starts to be discharged from the rotary tub 4 is reached, so that the time can be properly measured, and the accuracy of the dehydration operation control can be improved. Can be expected.

[0056]

As apparent from the above description, the present invention has the following effects. ◎ According to the first aspect of the present invention , the motor is rotated in one direction during the washing operation.
And stopping, and in front of the motor.
During each drive period, the motor rotation speed is
Drive the motor so that it is combined with low-speed rotation
Since the control is performed, the cleaning effect can be improved while preventing the cloth from being damaged or contracted.

According to the second aspect of the present invention, during the washing operation,
Repeatedly rotating and stopping the motor
And in each drive period of the motor,
Rolling speed, slow rise, fast rise, fast
The motor is set to fall and
Since the drive is controlled, the stirrer can be driven without suddenly increasing the relative speed difference between the clothes and the stirrer, so that the cleaning effect can be improved while preventing damage to the clothes and shrinkage of the clothes. .

According to the third aspect of the present invention, by rotating the motor alternately in one direction and the other direction, the clothes can be washed evenly, and the motor can be driven by each rotation of the motor in one direction.
During the operation period, the rotation speed of the motor is changed between high speed rotation and low speed rotation.
And the driving period in the other direction rotation of each time
Then, before setting the rotation speed of the motor to the low speed rotation,
Since the drive of the motor is controlled, the cleaning effect can be improved while preventing the cloth from being damaged or contracted.

According to the invention of claim 4, during the washing operation,
Repeatedly rotating and stopping the motor
And at least one of the driving periods of the motor
During the first drive period, the motor rotation speed is
In combination with high-speed rotation, the motor
The rotation speed of the motor gradually increases
, Fast fall, slow fall
At least the first drive period because the motor is driven and controlled
In the above, the clothes that easily float on the water can be quickly submerged in the water to sufficiently contain the water, and in other driving periods, the cleaning effect can be improved while preventing the clothes from being damaged or shrinking. The cleaning efficiency is generally improved.

[0060]

According to the fifth aspect of the present invention, the motor is started at a stroke until the rotation speed at which water is released from the dewatering tank,
After that, the rotation speed of the motor is gradually increased to the predetermined rotation speed, so that a large centrifugal force is not suddenly applied to the clothes, and the dewatering effect is achieved without causing the clothes to lose shape and reducing the dewatering time. Can be raised. According to the invention of claim 6, the dewatering time is counted from the time when the rotation speed at which the water starts to be discharged from the dewatering tank is reached, so that the time can be properly measured, and the accuracy of the dewatering operation control can be expected to be improved. .

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of motor drive control according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional side view of the washing machine.

FIG. 3 is a plan view of a stirring body.

FIG. 4 is a plan view of an operation panel.

FIG. 5 is a block diagram of an electrical configuration.

FIG. 6 is a diagram showing a state of water flow formation.

FIG. 7 is a diagram illustrating an example of motor drive control;

FIG. 8 is a diagram illustrating an example of motor drive control;

FIG. 9 is a diagram illustrating an example of motor drive control;

FIG. 10 is a diagram illustrating an example of motor drive control;

FIG. 11 is a diagram illustrating an example of motor drive control according to the second embodiment of the present invention.

FIG. 12 is a diagram illustrating an example of motor drive control according to the third embodiment of the present invention.

FIG. 13 is a diagram illustrating an example of motor drive control according to the fourth embodiment of the present invention.

FIG. 14 is a schematic structural view of a rotary tank for explaining operation.

[Explanation of symbols]

Reference numeral 4 denotes a rotary tank (dewatering tank), 4a denotes a tank body, 4d denotes a dewatering hole, 5 denotes a stirring body, 15 denotes a motor, and 41 denotes a microcomputer (motor drive control means, operation control means).

Continuation of the front page (56) References JP-A-8-188787 (JP, A) JP-A-9-19593 (JP, A) JP-A-9-239187 (JP, A) JP-A-57-203489 (JP) JP-A-5-208088 (JP, A) JP-A-6-15089 (JP, A) JP-A-52-164369 (JP, U) Patent 2544000 (JP, B2) (58) Fields investigated ( Int.Cl. ⁷ , DB name) D06F 33/02 D06F 49/04 D06F 17/08

Claims (6)

(57) [Claims] An agitator provided in a tank, a motor for rotating the agitator, and a motor for rotating the motor in one direction during a washing operation.
And stopping, and each of the motors
The rotation speed of the motor during high-speed rotation and low-speed
A washing machine comprising: motor drive control means for controlling the drive of the motor so as to be combined with rotation . 2. A stirrer provided in a tank, a motor for rotationally driving the stirrer, and rotating and stopping the motor during a washing operation .
And the driving period of each time of the motor
Then, gradually increase the rotation speed of the motor,
A fast rise, a fast fall, a slow fall
And a motor drive control means for controlling the drive of the motor. 3. A stirrer provided in a tank, a motor for rotationally driving the stirrer, and the motor is rotated in one direction during a washing operation and stopped.
And then repeatedly rotate and stop in the other direction,
In the driving period of each one-way rotation of the motor,
The rotation speed of the combination of high-speed rotation and low-speed rotation,
In the driving period in each of the other direction rotations, the rotation of the motor is
A washing machine comprising: motor drive control means for controlling the drive of the motor so that the speed is set to the low-speed rotation . 4. A stirrer provided in a tank, a motor for rotationally driving the stirrer, and rotating and stopping the motor during a washing operation .
And the driving period of each time of the motor
Of these, at least during the first drive period, the motor speed
Degree is a combination of high-speed rotation and low-speed rotation,
During the drive period, gradually increase the motor speed gradually.
Bite, fast rise, fast fall, loose fall
And a motor drive control means for controlling the drive of the motor. 5. A dehydration tub, a motor for rotating the dehydration tub, and a motor for rotating the dehydration tub.
Up to the rotation speed at which
Gradually increase the rotation speed to the specified rotation speed.
A washing machine comprising: a motor drive control unit for performing drive control . 6. A dewatering tub , a motor for rotating and driving the dewatering tub, and water is started to be discharged from the dehydration tub during a dehydration operation.
Dehydration that counts dehydration time from the point when rotation speed is reached
Means for measuring time, dehydration based by dehydration time measuring means counts time
A washing machine comprising: operation control means for controlling operation .