JPH07112094A - Washing machine - Google Patents

Abstract

PURPOSE:To surely detect unbalance rotation without being influenced so much by the inclined state of cloth, etc., in a dehydration tub, and to prevent the generation of abnormal vibration and abnormal noise. CONSTITUTION:A control circuit 21 increases a rotational speed of a motor 5 to a first reference speed, and thereafter, controls so as to decelerate the motor 5, and measures the time until the rotational speed of the motor decreases to a second reference speed after this deceleration is started. When this measured time is below the reference time, a final dehydration rotational speed of the motor 5 is changed so as to decrease it from a target rotational speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine provided with measures against unbalance rotation.

[0002]

2. Description of the Related Art As is well known, in a washing machine, an unbalance detection lever is provided outside the dehydration tub, and an unbalance detection switch that is turned on and off by the operation of the lever is provided to detect unbalance. I have to. In this device, when the dehydration tub rotates largely unbalanced, the unbalance detection switch operates by touching the unbalance detection lever, and the rotation of the dehydration tub (motor rotation) is stopped.

[0003]

However, in the above-mentioned conventional structure, the dewatering tub cannot be detected due to the imbalanced state of the cloth in the dewatering tub, which cannot be detected and cannot be rotated as it is. The speed may increase. In this case, there are a case where vibration and noise increase when the rotation of the dehydration tank rises to reach the final target rotation speed state, and a case where unbalanced rotation is naturally eliminated. Of course, the rotation speed increases even when there is no unbalanced rotation.

The present invention has been made in view of the above circumstances, and an object thereof is to detect unbalance rotation reliably without being significantly affected by the uneven state of the cloth in the dehydration tank, and to detect abnormal vibration. Another object of the present invention is to provide a washing machine which can prevent the generation of abnormal noise and can perform dehydration without stopping the dehydration operation even when the unbalanced rotation is naturally eliminated.

[0005]

A first means is a motor for rotating a dehydration tub, a rotation speed detecting means for detecting a rotation speed of the motor, and a rotation speed of the motor for starting a dehydration operation. The motor is controlled to decelerate after being raised to the reference speed, and the time from the start of deceleration until the motor rotation speed drops to the second reference speed is measured. And the dehydration control means for changing the final dehydration rotation speed so as to be lower than the target rotation speed (the invention of claim 1).

In addition to the constituent elements of the first means, the second means is a power supply voltage detecting means for detecting the power supply voltage, and the higher the detection voltage of the power supply voltage detecting means, the longer the reference time of the dehydration control means. The present invention is characterized in that a reference time setting means for setting the above is provided.

The third means is, in addition to the components of the first means, a temperature detecting means for detecting the temperature of the water supplied into the dehydrating tank, and a dehydrating controlling means as the temperature detected by the temperature detecting means is higher. The present invention is characterized in that it is provided with a reference time setting means for setting the reference time to be shortened (the invention of claim 3).

The fourth means is, in addition to the components of the first means, a power supply voltage detecting means for detecting the power supply voltage, a temperature detecting means for detecting the temperature of water supplied into the dehydration tank, and the power supply. The present invention is characterized in that a voltage detection means and a reference time setting means for setting the reference time of the dehydration control means based on the detection result of the temperature detection means are provided (the invention of claim 4).

In a fifth means, in any one of the first to fourth means, the motor is composed of a capacitor starting type motor, and the dehydration control means energizes both the main coil and the auxiliary coil of this motor. The case and the case where only the auxiliary coil is energized are switched. The switching means is provided, and both the main coil and the auxiliary coil of the motor are energized when the motor is accelerated, and the auxiliary coil is decelerated. Only the power is supplied to the device (the invention of claim 5).

In a sixth means, in any one of the first to fourth means, the motor is composed of a capacitor starting type motor, and the dehydration control means energizes both the main coil and the auxiliary coil of this motor. A switching means is provided for switching between the case and the case where only the main coil is energized, and both the main coil and the auxiliary coil of the motor are energized when the motor is accelerated and only the main coil is decelerated. Is controlled to be energized (the invention of claim 6).

In a seventh means, in any one of the first to fourth means, the motor is composed of a condenser starting type motor, and the dehydration control means energizes both the main coil and the auxiliary coil of this motor. The case and the case of switching off both the main coil and the auxiliary coil are provided with a switching means, and when the motor is accelerated, both the main coil and the auxiliary coil of the motor are energized to decelerate. When this is done, control is performed to turn off both the main coil and the auxiliary coil of the motor (the invention of claim 7).

In an eighth means, in any one of the first to fourth means, the motor is a DC brushless motor, and the dehydration control means is provided with voltage changing means for changing the voltage applied to this motor. In addition to the above configuration, when the motor is decelerated, the voltage applied to the motor is controlled to be lower than that when the motor is accelerated (the invention of claim 8).

In a ninth means, in any one of the first to fourth means, the motor is composed of a condenser starting type motor, the dehydration control means is provided with a phase control means, and the motor is decelerated. When the control is performed, the phase control is performed so that the conduction angle of the voltage applied to the motor is smaller than that at the time of acceleration (the invention of claim 9).

In a tenth means according to any one of the first to fourth means, the motor is constituted by a capacitor starting type motor, and the dehydration control means is provided with PWM control means for PWM controlling the AC power source. When the motor is decelerated, control is performed so that the PWM duty ratio is smaller than that during acceleration (invention of claim 10).

[0015]

When the motor is decelerated after the dehydration tub has been raised to a predetermined rotation speed, the degree of deceleration correlates with the degree of unbalanced rotation. That is, when the degree of unbalance is large, the rotational inertia force of the dehydration tank is small and deceleration is quicker than when the degree of unbalance is small.

Therefore, in the means of the present invention, at the start of the dehydration operation, the rotational speed of the motor is controlled so as to be decelerated after the rotational speed of the motor is increased to the first reference speed. Since the time required to fall to the reference speed of 2 is measured, it is possible to determine the magnitude of the unbalanced rotation based on the length of this measurement time. In the means of the present invention, when the measurement time is equal to or less than the reference time, that is, when the unbalanced rotation is large, the final dehydration rotation speed of the motor is changed to be lower than the target rotation speed, so that vibration and noise are generated. It is also possible to carry out the dehydration operation without doing so. Further, even when the unbalanced rotation is naturally eliminated, the dehydration operation can be performed without stopping the dehydration operation.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, FIG. 2 shows a vertical cross-sectional structure of a washing machine for combined use of dehydration. A water receiving tank 2 is provided inside the outer box 1, and a rotating tank 3 which also serves as a washing tank and a dehydrating tank is provided inside the water receiving tank 2. An agitator 4 is provided in the lower part inside the rotary tank 3. A mechanism portion 6 mainly composed of a motor 5 composed of a condenser starting type motor is provided in the lower outer portion of the water receiving tank 2, and a drain valve 7 is provided in a drain passage at the bottom of the water receiving tank 2.
The motor 5 also serves as a washing motor and a dehydrating motor.

Further, a water supply valve 9 and a water level sensor 10 are provided inside the top plate cover 8 above the outer case 1, and a control unit 11 is provided inside the front part. A deceleration mechanism is provided in the mechanical unit 6 so that the rotation speed of the motor 5 is reduced to 1/2 and transmitted to the rotary tank 3 during the dehydration operation. Further, although not shown, the rotary tank 3 is provided above the inside of the outer box 1.
An unbalanced rotation and a lever for detecting the swing of the water receiving tank 2 and an unbalanced detection switch responsive thereto are provided.

FIG. 1 shows the electrical configuration. The common connection terminal 5a of the motor 5 is connected to one terminal of the AC power supply 12, and the other terminals 5b and 5c of the motor 5 are connected to the other terminal of the AC power supply 12 via the triacs 13 and 14, respectively. There is. Furthermore, the other terminal 5 of the motor 5
b and 5c are connected to one ends of triacs 15 and 16, and the other ends of the triacs 15 and 16 are connected to the AC power source 1 via a common starting capacitor 17 and coil 18.
2 is connected to the other terminal. Then, the switching means 1 is constituted by the triacs 13, 14, 15 and 16 described above.
9 are configured. The motor 5 includes the starting capacitor 17 to form a capacitor starting type motor.

The motor 5 is provided with a rotation speed detecting means 20 for detecting the rotation speed of the motor 5, which is composed of, for example, a Hall element, and a detection signal from the rotation speed detecting means 20 is given to the control circuit 21.

The control circuit 21 comprises a microcomputer, a gate circuit and an A / D converter, and this control circuit 21 functions as a dehydration control means including the switching means 19. The triacs 13 and 14 are on / off controlled by the control circuit 21, and the triacs 15 and 16 are controlled by the control circuit 21.
By this, on / off control is performed via the photocouplers 22 and 23.

Here, the motor 5 can be switched between the full coil energization mode, the main coil energization mode, and the auxiliary coil energization mode according to the on / off patterns of the triacs 13 to 16. Table 1 shows the relationship with modes
As shown in.

[0023]

[Table 1]

In this case, in the all coil energization mode, the triacs 13 and 16 are turned on and the triac 1 is turned on.
By turning off the coils 4 and 15, the coil 5e of the motor 5 is energized without passing through the starting capacitor 17 and the coil 18, and the coil 5d is switched to the starting capacitor 17 and the coil 1.
Power is supplied via 8. Therefore, in this case, the coil 5e corresponds to the main coil and the coil 5d corresponds to the auxiliary coil, which is an energization mode in which both the main and auxiliary coils are energized.

In the main coil energizing mode, by turning on only the triac 13, only the coil 5e is energized without passing through the starting capacitor 17 and the coil 18. Furthermore, in the auxiliary coil energization mode, by turning on only the triac 16, the coil 5
Only d is energized via the starting capacitor 17 and the coil 18.

The control circuit 21 includes a control unit 11
In addition to being provided with switch signals from various switches 24 included in the water level sensor 10 and the rotation speed detecting means 2,
The output from 0 is given. And
The control circuit 21 controls the motor 5, the drain valve 7, the water supply valve 9 and the display unit 25 included in the control unit 11 according to an operation program stored therein,
It controls the washing operation, the rinsing operation, and the dehydration operation, and particularly functions during the dehydration operation as the dehydration control means as follows.

That is, when the dehydration operation is started, the on / off mode of the triacs 13 to 16 of the switching means 19 is set to the full coil energization mode (both the main coil and the auxiliary coil are energized), and the motor 5 is energized in this mode. The rotary tank 3 is rotated. In this case, if the unbalanced rotation of the rotary tank 3 is excessively large, this is detected by a lever and an unbalanced detection switch (not shown) and the motor 5
Is cut off. By the way, in this mechanical unbalance detecting means, the unbalanced rotation may not be detected because the water receiving tank 2 does not touch the lever depending on the unevenness of the cloth even if the unbalanced rotation occurs. If unbalanced rotation has not occurred, of course, unbalanced rotation is not detected.

As described above, in a situation where unbalanced rotation is not detected by the lever and the unbalanced detection switch, the rotation speed of the rotary tank 3 increases as shown in FIG. Then, the rotary tank 3 has a first reference speed, for example, 60.
0r.pm (The rotation speed of the motor 5 is 1200r.pm
) Is reached, the on / off mode of the triacs 13 to 16 of the switching means 19 is set to the auxiliary coil energization mode,
The motor 5 is energized in this auxiliary coil energization mode.

In the auxiliary coil energization mode, the output torque of the motor 5 becomes equal to or lower than the spin-drying no-load torque in the washing machine, and the motor 5 is always decelerated. The degree of deceleration correlates with the degree of unbalanced rotation of the rotary tub 3, that is, when the degree of unbalance is large, the rotational inertia force of the rotary tub 3 is small compared to when the degree of unbalance is small and the deceleration is reduced. The method is fast.

The control circuit 21 starts time counting from the start of deceleration, and the rotation speed of the rotary tank 3 is the second reference speed, for example, 550 rpm.
When it falls to 100 r.pm), this time count is stopped, and the count time t which is the count value exceeds the reference time (in this case, it is uniquely set to 7 seconds) (Fig. 3). (See solid line K1 in (a)), the final rotation speed of the rotary tank 3 is increased to the target rotation speed of 1000 rpm to maintain this rotation speed, and the motor 5 is turned off when the set dehydration time has elapsed. That is, since the measurement time t is relatively long, it is detected that the degree of unbalanced rotation is small or that it hardly occurs.
Perform dehydration operation as usual.

When the measurement time t is 7 seconds or less (see the broken line K2 in FIG. 3 (a)), the final rotation speed of the rotary tank 3 is lower than the target rotation speed 1000 rpm.
The speed is controlled so that it is set to 20 rpm. That is,
Since the measurement time t is short, it is detected that the degree of unbalanced rotation is relatively large.
By lowering the final rotation speed of the above than the target rotation speed, the dehydration is performed while suppressing the generation of abnormal vibration and noise.

According to the present embodiment as described above, the degree of unbalanced rotation is detected by detecting the degree of deceleration of the motor 5, so that the degree of unbalanced rotation of the cloth in the rotary tub 3 is not significantly affected. Unbalanced rotation can be reliably detected. When it is detected that the degree of unbalanced rotation is relatively large because the measurement time t is 7 seconds or less, the final rotation speed of the rotary tank 3 is set to the target rotation speed 1
Since the speed is controlled to 920 rpm which is lower than 000 rpm, abnormal vibration and noise are prevented from occurring, and even when the unbalanced rotation is naturally resolved, the dehydration operation is not stopped. Can perform dehydration.

FIG. 4 shows a second embodiment of the present invention. In this embodiment, when decelerating the motor 5, the energization mode of the motor 5 is the energization mode of only the main coil. Different from the first embodiment. The second embodiment also has the same effect as the first embodiment.

FIG. 5 shows a third embodiment of the present invention. In this embodiment, when decelerating the motor 5, both the main coil and the auxiliary coil of the motor 5 are turned off. The difference is that it is different from the first embodiment. This third
Also in this embodiment, the same effect as that of the first embodiment is obtained.

FIGS. 6 to 8 show a fourth embodiment of the present invention. In this embodiment, the following points are different from the first embodiment. That is, the motor 31 is composed of a DC brushless motor, and the motor drive control circuit 32 that drives and controls the motor 31 controls the drive circuit 33 having three pairs of switching elements and the on-duty ratio of the switching elements. The control unit (applied voltage changing unit) 34 controls the commutation timing while changing the applied voltage to the motor 31. The drive circuit 33 is supplied with DC power from the DC power supply circuit 35.

When the dehydration operation is started, the control circuit 36 having the function as the dehydration control means applies the voltage V2 to the motor 31 as shown in FIG. 7 (a) so that the rotation speed of the rotary tank is 600r. When it reaches .pm, the applied voltage is changed to the voltage V3. The purpose of setting the voltages V3 and V2 is as follows. That is, as shown in FIG. 8, the load line L1 indicates the load line during the normal dehydration rotation. In this load line L1, at the applied voltage V0, the torque of the motor 31 becomes T0, and the rotation speed becomes 2000 rpm (1000 rpm as the rotation speed of the rotary tank). Similarly, the rotation speed of the motor 31 is 1600 rpm, 1200 rpm, 600 rpm.
When m, the torque is T1, T2, T3. That is, at the voltage V2, the rotation speed of the rotary tank rises to 600 rpm, and at the voltage V3, the rotation speed of the rotary tank is finally reduced to 300 rpm.

Thus, the control circuit 36 measures the time t at which the rotation speed of the rotary tank drops to 550 rpm, and when the measurement time t exceeds the set reference time t1, the final rotation speed ( Rotation speed of the rotating tank) 1000r.pm
When the measurement time t is the reference time t1 or less, the final rotation speed (rotation speed of the rotary tank) is controlled to be 920 rpm. Also in the fourth embodiment, the same effect as that of the first embodiment is obtained.

9 to 11 show a fifth embodiment of the present invention, which is different from the first embodiment in the following points. The triac 4 is used for the power supply circuit to the motor 5.
1, 42 are provided, and a zero-cross detection circuit 43 that detects the zero-cross of the AC voltage is provided. The triacs 41 and 42 are turned on by the control circuit 44 in any of the patterns shown in FIG.
The AC voltage is phase-controlled. Figure 10
In the case of (a), the energization angle α is small, as shown in FIG.
(B), (c), and (d) increase in this order, and the applied voltage by phase control in each pattern is V3, V, respectively.
2, V1 and V0. Then, as shown in FIG. 11, on the dehydration steady load line L1, each voltage V3, V
For 2, V1 and V0, 2000r.pm and 18 respectively
The rotation speed is 40 rpm, 1200 rpm, and 600 rpm.

The control circuit 44 is a dehydration control means, and at the start of the dehydration operation, the motor 5 is energized by controlling the phase with an energization angle α as shown in FIG. Rises to the first reference speed of 1200 rpm (600 rpm as the rotation speed of the rotary tank),
The phase is controlled by the conduction angle α as shown in FIG. As a result, the motor 5 is decelerated, and the second reference speed 1100
When the rpm (rotation speed of the rotary tank is 550 rpm) is reached, the rotation speed of the motor 5 is based on the measurement time t up to the second reference speed during deceleration, as in the first embodiment. Is controlled to 2000 r.pm (1000 rpm for a rotary tank) or 1840 rpm (920 rpm for a rotary tank). Also in this fifth embodiment, the first
The same effect as that of the above embodiment is obtained.

12 and 13 show a sixth embodiment of the present invention, which is different from the fifth embodiment in the following points. The diode bridge circuit 52 and the switching transistor 5 are provided on one power supply line of the AC power supply 51.
3 is provided, and a flywheel that discharges the energy stored in the inductance of the motor 5 during PWM control between the two power supply lines of the AC power supply 51 to convert it to the power supply side. A circuit 55 is provided.

Control circuit 56 functioning as dehydration control means
Turns on / off the switching transistor 53 at an arbitrary duty ratio (FIG. 13A shows a case where the duty ratio is 50%). Therefore, as shown in FIG. It is controlled to change the voltage Va applied to the motor 5. In this case, when the motor 5 is decelerated, the PWM duty ratio is controlled to be smaller than that during acceleration. The sixth embodiment also has the same effect as the first embodiment.

14 and 15 show a seventh embodiment of the present invention. In the seventh embodiment, a power supply voltage detection circuit 61 serving as a power supply voltage detection means for detecting the voltage of the power supply 12 is provided, and a reference time setting means (the control circuit 62 functions as the reference time setting means) is provided. The point is different from the first embodiment. The power supply voltage detection circuit 61
15 are resistors 63, 64, 65, 6 as shown in FIG.
6, 67, a capacitor 68, and a diode 69.

The control circuit 62 sets the reference time as shown in Table 2 according to the voltage detected by the power supply voltage detection circuit 61, and the set reference time and the above-mentioned measurement time t.
The final rotation speed of the rotary tank 3 (the rotation speed of the motor 5) is controlled in the same manner as in the first embodiment by comparing

[0044]

[Table 2]

Now, when the power supply voltage is low, the motor torque also decreases during the deceleration period of the motor 5 in the auxiliary coil energization mode, and the deceleration degree reaches a large second speed quickly. Conversely, when the power supply voltage is high, the motor torque increases during the deceleration period of the motor 5 in the auxiliary coil energization mode, the deceleration degree is small, and the second reference speed is reached slowly. Therefore, if the reference time is set to be constant regardless of the power supply voltage, the degree of unbalance rotation detection becomes inaccurate.

However, according to the seventh embodiment, as can be seen from Table 2, the reference time is set short when the power supply voltage is low, and the reference time is set long when the power supply voltage is high. Accordingly, the degree of unbalanced rotation can be properly detected.

16 to 19 show an eighth embodiment of the present invention. In the eighth embodiment, a temperature sensor 71 as a temperature detecting means for detecting the temperature of the water supplied into the rotary tank 3 is provided, and a reference time setting means (the control circuit 72 functions as the reference time setting means). Is different from the first embodiment.

The temperature sensor 71 is shown in FIG. 18 and FIG.
As shown in FIG. 9, it is attached to the outer bottom of the water receiving tank 2 via a mounting plate 73, and the mounting plate 73 is a cover plate 74.
Are covered by. As shown in FIG. 17, the temperature sensor 71 is provided with a sensor circuit 77 having a resistor 75 and an A / D converter 76.
The temperature detection signal signal-processed by 7 is supplied to the control circuit 72.

When the temperature detection signal (detection temperature) is given, the control circuit 72 sets the reference time as shown in Table 3 according to the temperature detection signal.
As can be seen from Table 3, the higher the detected temperature, the shorter the reference time is set. And the control circuit 72
Compares the set reference time with the above-described measurement time t to control the final rotation speed of the rotary tank 3 (rotation speed of the motor 5) in the same manner as in the first embodiment.

[0050]

[Table 3]

The purpose of setting the reference time according to the water temperature is as follows. That is, when the water temperature is high,
The rigidity of the rotary tank 3 usually made of synthetic resin is slightly lowered. Then, during the spin-drying rotation, it may be temporarily deformed, and unbalanced rotation and abnormal vibration are likely to occur. However, in the eighth embodiment, the unbalanced rotation and the abnormal vibration can be prevented by shortening the reference time at the time of high water temperature where the unbalanced rotation and the abnormal vibration are expected to occur. Can be prevented from plastic deformation.

The above-mentioned reference time may be set according to the power supply voltage and the temperature of the water supplied into the rotary tank 3. In this case, the setting method is the same as that of the present invention. Table 4 shown as the ninth embodiment of the above may be used.

[0053]

[Table 4]

That is, under constant water temperature conditions, the reference time is set longer as the power supply voltage increases, and under constant power supply voltage conditions, the reference time is set shorter as the water temperature increases. Therefore, when the power supply voltage is low and the water temperature is high, the reference time is set to be considerably short, and conversely, when the power supply voltage is high and the water temperature is low, the reference time is set to be considerably long. Besides, the present invention is not limited to the embodiments described above and shown in the drawings, and various modifications can be made without departing from the scope of the invention.

[0055]

As is apparent from the above description, the present invention controls so that the motor speed is increased to the first reference speed at the start of the dehydration operation and then the motor is decelerated.
The time from the start of this deceleration until the motor rotation speed falls to the second reference speed is measured, and when this measurement time is less than the reference time, the final dehydration rotation speed of the motor is changed to be lower than the target rotation speed. As a result, unbalanced rotation can be reliably detected without being greatly affected by the uneven state of the cloth in the dehydration tank, etc., and therefore unbalanced rotation can be performed naturally while preventing abnormal vibration and noise. Even if it is solved, it is possible to obtain the excellent effect that the dehydration can be performed without stopping the dehydration operation.

Further, the power source voltage is detected, and the higher the detected voltage is, the longer the reference time of the dehydration control means is set so that even if the power source voltage is different, the uneven state of the cloth in the dehydration tank is always maintained. The unbalanced rotation can be reliably detected without being affected so much.

Further, the temperature of the water supplied into the dehydration tank is detected, and the higher the detected temperature, the shorter the reference time of the dehydration control means is set to set the water supplied into the dehydration tank. Even if the temperature is different, the unbalanced rotation can be reliably detected without being significantly affected by the uneven state of the cloth in the dehydration tank.

Furthermore, while detecting the power supply voltage,
By detecting the temperature of the water supplied into the dehydration tank and setting the reference time of the dehydration control means based on those detection results, the unbalanced rotation is always detected reliably according to the power supply voltage and the water temperature. be able to.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram showing a first embodiment of the present invention.

[Figure 2] Vertical side view of the washing machine

FIG. 3 is a diagram showing a motor energization pattern and a rotation speed change of a rotary tank.

FIG. 4 is a diagram corresponding to FIG. 3 showing a second embodiment of the present invention.

FIG. 5 is a view corresponding to FIG. 3 showing a third embodiment of the present invention.

FIG. 6 is a block diagram of an electrical configuration showing a fourth embodiment of the present invention.

FIG. 7 is a diagram showing a voltage applied to a motor and a change in rotation speed of a rotary tank.

FIG. 8 is a diagram showing a relationship between motor rotation speed and torque.

FIG. 9 is an electric circuit diagram showing a fifth embodiment of the present invention.

FIG. 10 is a diagram showing a phase control waveform pattern.

FIG. 11 is a diagram showing a relationship between motor rotation speed and torque.

FIG. 12 is an electric circuit diagram showing a sixth embodiment of the present invention.

FIG. 13 is a diagram showing on / off patterns and voltage waveforms of switching transistors.

FIG. 14 is an electric circuit diagram showing a seventh embodiment of the present invention.

FIG. 15 is an electric circuit diagram showing a power supply voltage detection circuit.

FIG. 16 is an electric circuit diagram showing an eighth embodiment of the present invention.

FIG. 17 is an electric circuit diagram showing a sensor circuit.

FIG. 18 is a vertical sectional side view of the washing machine.

FIG. 19 is a vertical sectional side view of a temperature sensor mounting portion.

[Explanation of symbols]

3 is a rotary tank (dehydration tank), 5 is a motor, 19 is a switching means,
20 is a rotation speed detection means, 21 is a control circuit (dehydration control means), 31 is a motor, 32 is a motor drive control circuit, 36
Is a control circuit (dehydration control means), 41 and 42 are triacs, 44 is a control circuit (dehydration control means), 54 is PWM control means, 56 is a control circuit (dehydration control means), and 61 is a power supply voltage detection circuit (power supply voltage). Detection means), 62 is a control circuit (dehydration control means, reference time setting means), 71 is a temperature sensor (temperature detection means), and 72 is a control circuit (dehydration control means,
Reference time setting means), 77 is a sensor circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiro Imai 991, Anada-cho, Seto-shi, Aichi Prefecture Toshiba Aichi Plant Co., Ltd. (72) Inventor Yoshiyuki Makino 4--21, Yoshihara-cho, Nishi-ku, Nagoya Toshiba Abu・ E Co., Ltd. Nagoya Office

Claims (10)

[Claims] 1. A motor for rotating a dehydration tank, a rotation speed detecting means for detecting a rotation speed of the motor, and a motor after increasing the rotation speed of the motor to a first reference speed at the start of the dehydration operation. Control to slow down,
The time from the start of this deceleration until the motor rotation speed falls to the second reference speed is measured, and when this measurement time is less than the reference time, the final dehydration rotation speed of the motor is changed to be lower than the target rotation speed. A washing machine comprising a control means. 2. A motor for rotating a dehydration tank, a rotation speed detecting means for detecting a rotation speed of the motor, and a motor after increasing the rotation speed of the motor to a first reference speed at the start of the dehydration operation. Control to slow down,
The time from the start of this deceleration until the motor rotation speed falls to the second reference speed is measured, and when this measurement time is less than the reference time, the final dehydration rotation speed of the motor is changed to be lower than the target rotation speed. A washing machine comprising a control means, a power supply voltage detection means for detecting a power supply voltage, and a reference time setting means for setting the reference time to be longer as the detection voltage of the power supply voltage detection means is higher. 3. A motor for rotating a dehydration tank, a rotation speed detecting means for detecting a rotation speed of the motor, and a motor after increasing the rotation speed of the motor to a first reference speed at the start of the dehydration operation. Control to slow down,
The time from the start of this deceleration until the motor rotation speed falls to the second reference speed is measured, and when this measurement time is less than the reference time, the final dehydration rotation speed of the motor is changed to be lower than the target rotation speed. Control means, temperature detection means for detecting the temperature of the water supplied into the dehydration tank, and reference time setting means for setting the reference time to be shorter as the temperature detected by the temperature detection means is higher. A washing machine that does. 4. A motor for rotating a dehydration tank, a rotation speed detecting means for detecting a rotation speed of the motor, and a motor after increasing the rotation speed of the motor to a first reference speed at the start of the dehydration operation. Control to slow down,
The time from the start of this deceleration until the motor rotation speed falls to the second reference speed is measured, and when this measurement time is less than the reference time, the final dehydration rotation speed of the motor is changed to be lower than the target rotation speed. Based on a control means, a power supply voltage detection means for detecting a power supply voltage, a temperature detection means for detecting the temperature of water supplied into the dehydration tank, a power supply voltage detection means and a detection result of the temperature detection means. A washing machine comprising a reference time setting means for setting the reference time. 5. The motor is composed of a condenser starting type motor, and the dehydration control means switches between energization of both the main coil and auxiliary coil of this motor and energization of only the auxiliary coil. Equipped with means,
5. The control for energizing both the main coil and the auxiliary coil of the motor when increasing the speed of the motor, and energizing only the auxiliary coil for decelerating the motor. The washing machine described in. 6. The motor is composed of a condenser starting type motor, and the dehydration control means switches between a case where both the main coil and the auxiliary coil of the motor are energized and a case where only the main coil is energized. 2. A means for controlling the energization of both the main coil and the auxiliary coil of the motor when accelerating the motor, and energizing only the main coil when decelerating the motor. The washing machine according to any one of 4 above. 7. The motor is composed of a capacitor starting type motor, and the dehydration control means operates both when the main coil and the auxiliary coil of the motor are energized and when both the main coil and the auxiliary coil are de-energized. A switching means is provided for switching between the case of switching and the case of switching to energize both the main coil and the auxiliary coil of the motor when accelerating the motor, and to perform the control of disconnecting both the main coil and the auxiliary coil of the motor when decelerating. The washing machine according to any one of claims 1 to 4, wherein: 8. The motor comprises a DC brushless motor, and the dehydration control means includes voltage changing means for changing the voltage applied to the motor, and when decelerating the motor, increasing the voltage applied to the motor. The washing machine according to any one of claims 1 to 4, wherein the washing machine is controlled to be lower. 9. The motor is composed of a condenser starting type motor, and the dehydration control means is provided with a phase control means, and when decelerating the motor, the conduction angle of the voltage applied to the motor is made smaller than that during acceleration. The washing machine according to any one of claims 1 to 4, wherein phase control is performed. 10. The motor is composed of a condenser starting type motor, and the dehydration control means is provided with PWM control means for performing PWM control of an AC power source, and when decelerating the motor, P is used.
The washing machine according to any one of claims 1 to 4, wherein the WM duty ratio is controlled to be smaller than that during acceleration.