KR0149467B1 - Washing machine - Google Patents

Abstract

The present invention relates to preventing unbalanced rotation of a washing machine. The washing machine according to the present invention includes a motor for rotating a dehydration tank, a rotation speed detecting means for detecting a rotation speed of the motor, and rotation of the motor at the start of dehydration operation. After the speed is raised to the first reference speed, the motor is controlled to decelerate. When the deceleration starts, the time until the motor rotation speed drops to the second reference speed is measured. When the measurement time is less than the reference time, the final dehydration of the motor is performed. And dehydration control means for changing the rotational speed to be lower than the target rotational speed.

Description

washer

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

2 is a longitudinal side view of the washing machine.

3 is a view showing a change in the rotational speed of the rotating pattern and the rotating tub of the motor.

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

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

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

7 is a view showing a change in the applied voltage of the motor and the rotational speed of the rotating tub.

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

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

10 is a view showing a phase control waveform pattern.

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

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

13 is a diagram showing on and off patterns and voltage waveforms of a switching transistor.

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

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

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

17 is an electric circuit diagram showing a sensor circuit.

18 is a longitudinal side view of the washing machine.

19 is a longitudinal sectional side view of the temperature sensor mounting portion.

* Explanation of symbols for main parts of the drawings

3: rotating tank (dewatering tank) 5, 31: motor

19: switching means 20: rotational speed detection means

21, 36, 44, 56: control circuit (dehydration control means)

32: motor drive control circuit 41, 42: TRIAC

54: PWM control means 61: power supply voltage detection circuit (power supply voltage detection means)

62, 72: control circuit (dehydration control means, reference time setting means)

71: temperature sensor (temperature detection means) 77: sensor circuit

The present invention relates to a washing machine for taking measures against unbalanced rotation.

As is well known, the washing machine is provided with an unbalance detection lever outside the dehydration tank and an unbalance detection switch that is turned on and off by the operation of the lever. It operates to stop rotation of a dehydration tank (rotation of a motor).

However, in the conventional configuration, depending on the bias of the cloth in the dewatering tank, the dewatering tank does not come into contact with the unbalance detection lever, so that it cannot be detected and the rotational speed may increase as it is. In this case, when the rotation of the dehydration tank is started and the final target rotational speed is reached, the vibration and noise are increased and the unbalanced rotation is naturally resolved. Of course, even if there is no unbalanced rotation, the speed increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and its object is to be able to reliably detect unbalanced rotation without much dependence on the biased state of the cloth in the dehydration tank, to prevent the occurrence of abnormal vibration and abnormal noise and to prevent unbalanced rotation. It is to provide a washing machine that can perform dehydration without stopping the dehydration operation even if the natural dissolution.

In order to achieve the above object, a first means of a washing machine according to the present invention includes a motor for rotating a dewatering tank, a rotation speed detecting means for detecting a rotation speed of the motor, and a signal from the rotation speed detecting means. In a washing machine having a control circuit for controlling the rotational speed of the motor, the control circuit controls to decelerate after increasing the rotational speed of the motor to a first reference speed lower than a target rotational speed at the start of dehydration operation, The time from the start of the deceleration until the rotation speed of the motor falls to the second reference speed lower than the first reference speed is measured. When the measurement time exceeds the preset reference time, the final dehydration rotation speed is the target rotation. If the measurement time is less than the reference time, the final dehydration rotation speed of the motor is set to the target rotation speed It has a dewatering control means for changing setting to a lower value (invention claims claim 1)

The second means includes power supply voltage detection means for detecting a power supply voltage to the component in the first means, and reference time setting means for setting the reference time of the dehydration control means to be long as the detection voltage of the power supply voltage detection means is high. It is characterized in that it is installed in addition. (Invention of claim 2)

The third means includes a temperature detecting means for detecting the temperature of the water supplied to the dehydration tank in addition to the components in the first means, and setting the reference time of the dehydration control means to be shorter as the detection temperature of the temperature detecting means is higher. A reference time setting means is provided (invention of claim 3).

The fourth means includes power supply voltage detecting means for adding a power supply voltage to the components of the first means, a temperature detecting means for detecting a temperature of water supplied into the dehydration tank, the power supply voltage detecting means and the temperature. And reference time setting means for setting a reference time of the dehydration control means based on the detection result of the detection means. (Invention of Claim 4)

The fifth means is one of the first to the fourth means, wherein the motor comprises a condenser starting type motor, and the dehydration control means energizes both the main coil and the auxiliary coil of the motor and only the auxiliary coil. In addition, the control unit is configured to switch between the main coil and the auxiliary coil of the motor when the speed is increased, and to control the energization of only the auxiliary coil when the motor is decelerated (the fifth claim). Claim invention).

The sixth means, in any one of the first to the fourth means, constitutes a motor as a condenser starting type motor, and the dehydration control means energizes both the main coil and the auxiliary coil of the motor and only the main coil. In addition, the control unit is configured to include a switching means for switching the power supply, and at the same time, when the motor is increased, only the main coil is energized when the motor is decelerated to energize both the main coil and the auxiliary coil of the motor (claim 6th). Claim invention).

The seventh means is one of the first to fourth means, wherein the motor is constituted by a condenser starting type motor, and the dehydration control means is energized by both the main coil and the auxiliary coil of the motor, and both the main coil and the auxiliary coil. And a switching means for switching the case of powering off at the same time, and controlling to cut off both the main coil and the auxiliary coil of the motor when decelerating the motor, and to cut off both the main coil and the auxiliary coil of the motor when decelerating. (The invention of claim 7).

The eighth means is one of the first to fourth means, wherein the motor comprises a DC brushless motor, and the dehydration control means includes a voltage changing means for changing the applied voltage to the motor. When the motor is decelerated, the voltage applied to the motor is controlled to be lower than at the time of increasing the speed (invention of claim 8).

The ninth means comprises the condenser starting type motor in any one of the first to fourth means, and the dehydration control means includes a phase control means. Phase control is performed to make the energizing angle of the applied voltage smaller than at the time of increasing the speed (invention of claim 9).

The tenth means is one of the first to fourth means, wherein the motor is constituted by a condenser starting type motor, and the dehydration control means includes PWM control means for PWM control of an AC power supply, Control to make the PWM duty ratio smaller than at the time of increasing speed is performed (invention of claim 10).

When the dehydration tank is raised to a predetermined rotational speed and the motor is decelerated, the deceleration is correlated with the degree of unbalanced rotation. In other words, when the unbalance is large, the rotational inertia of the dehydrating tank is smaller than that of the small one, and thus the method of deceleration is fast.

In this way, in the means of the present invention, when the dehydration operation starts, the motor speed is increased to the first reference speed and then the motor is decelerated, and from the start of the deceleration until the motor speed drops to the second reference speed. By measuring the time, it is possible to determine the magnitude of the unbalanced rotation by the length of the 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 unbalance 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 not generated and dehydration operation is performed. You can also do In addition, when the unbalance rotation is naturally dissipated, the dehydration operation can be performed without stopping the dehydration operation.

Hereinafter, a description will be given with reference to FIGS. 1 to 3 according to a first embodiment of the present invention. First, FIG. 2 shows the longitudinal cross-sectional structure of the washing machine for dehydration combined use. The drip tank 2 is installed inside the outer box 1, and the rotary tub 3 which serves as a washing tank and a dehydration tank is installed in the drip tank 2. The stirring body 4 is provided in the lower part of this rotating tank 3. In the lower part of the drip tray 2, the mechanism part 6 which mainly consists of the motor 5 which consists of a condenser starting type motor is provided, and the drainage valve 7 is provided in the drainage path of the bottom part of this drip tank 2, have. The motor 5 serves both a washing motor and a dehydration motor.

In addition, a water supply valve 9 and a water level sensor 10 are installed in the inner rear portion of the top plate cover 8 on the outer box 1, and a control unit 11 is provided inside the front portion. In addition, the mechanism part 6 is provided with a deceleration mechanism, and in the dehydration operation, the rotation speed of the motor 5 is decelerated to 1/2 to be transmitted to the rotating tank 3. In addition, although not shown, the inner upper side of the outer box 1 is provided with a lever for detecting unbalanced rotation of the rotating tank 3 and shaking of the drip tray 2 and an unbalance detection switch moving accordingly.

1 shows an 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 through the triac 13 and 14, respectively. It is connected to the other terminal of (12). One end of the triacs 15 and 16 is connected to the other terminals 5b and 5c of the motor 5, and the other ends of the triacs 15 and 16 have a common starting capacitor 17 and It is connected to the other terminal of the AC power supply 12 via the coil 18. In this way, the switching means 19 are constituted by the triacs 13, 14, 15 and 16. The motor 5 also includes the starting capacitor 17 to form a condenser starting type motor.

The motor 5 is provided with a rotational speed detection means 20 which is formed of, for example, a hall element for detecting the rotational speed thereof, and the detection signal by the rotational speed detection means 20 is controlled by the control circuit 21. Is given by

The control circuit 21 includes a microcomputer, a gate circuit, and an A / D converter, and the control circuit 21 functions as a dehydration control means including the switching means 19. The triacs 13 and 14 are controlled on and off by this control circuit 21, and the triacs 15 and 16 are connected to the photocouplers 22 and 23 by this control circuit 21. On and off control through.

Here, the motor 5 is switched to the entire coil energization mode, the main coil energization mode, and the auxiliary coil energization mode by the on and off patterns of the triacs 13, 14, 15, and 16, and each triac The relationship between the on and off patterns of (13), (14), (15) and (16) and the energization mode is shown in Table 1.

In this case, in the entire coil energization mode, the triacs 13 and 16 are turned on, and the triacs 14 and 15 are turned off so that the coil 5e of the motor 5 starts the condenser 17 and the starter. The current is energized without passing through the coil 18, and the coil 5d is energized through the starting capacitor 17 and the coil 18. 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 energization mode, only the triac 13 is turned on so that only the coil 5e is energized without passing through the starting capacitor 17 and the coil 18. In the auxiliary coil energization mode, only the triac 16 is turned on so that only the coil 5d is energized through the starting capacitor 17 and the coil 18.

The control circuit 21 is provided with a switch signal from various switches 24 included in the control unit 11, and outputs from the water level sensor 10 and the rotational speed detecting means 20. The control circuit 21 controls the display unit 25 of the motor 5, the drain valve 7, the water supply valve 9, and the control unit 11 according to the operation program held therein to perform the washing operation. And controlling the rinsing operation and the dehydration operation. In particular, during the dehydration operation, the dehydration control means functions as follows.

In other words, when the dehydration operation is started, the triacs 13, 14, 15 and 16 of the switching means 19 are turned on or off in all coil energization modes (both main coil and auxiliary coil energization). The rotating tank 3 is rotated by energizing the motor 5. In this case, if the unbalanced rotation of the rotating tub 3 is excessively large, this is detected by a lever (not shown) and an unbalance detection switch, and the motor 5 is disconnected. However, in this mechanical unbalance detection means, even if unbalanced rotation occurs, the unbalanced rotation may not be detected because the drip tank 2 does not come into contact with the lever depending on the bias condition of the cloth. Also, of course, unbalanced rotation is not detected unless unbalanced rotation is occurring.

In this situation, when the unbalance rotation is not detected by the lever and the unbalance detection switch, the rotation speed of the rotating tub 3 increases as shown in FIG. And when the rotating tank 3 reaches a 1st reference speed, for example, 600 r.pm (1200 rpm at the rotation speed of the motor 5), the triacs 13, 14, 15 of the switching means 19 ( The on and off mode of 16) is made into the auxiliary coil energization mode, and the motor 5 is energized in this auxiliary coil energization mode.

In this auxiliary coil energizing mode, the output torque of the motor 5 is equal to or less than the dehydration no-load torque in the washing machine, and the motor 5 always decelerates. The degree of deceleration correlates with the degree of unbalanced rotation of the rotating tub 3, i.e., when the unbalance degree is large, the rotational inertia force of the rotating tub 3 is small compared to the case where the unbalance is large, and thus the deceleration method is fast.

The control circuit 21 starts a time count at the start of this deceleration and the rotation speed of the rotating tank 3 drops to a second reference speed, for example, 550 r.pm (1100 r.pm at the rotation speed of the motor 5). If the time count is stopped and the measured time t, which is the count value, exceeds the reference time (which is set uniformly to 7 seconds in this case) (see solid line K1 in Fig. 3 (a)), the rotating tank 3 Raises the final rotational speed of) to the target rotational speed 1000r.pm and maintains this rotational speed, and cuts off the motor 5 when the set dehydration time elapses. That is, it is detected that the degree of unbalance rotation is small or hardly occurs when the specific time t is relatively long. In this case, dehydration operation is performed as usual.

When the measurement time t is 7 seconds or less (see dashed line K2 in FIG. 3 (a)), the final rotation speed of the rotating tub 3 is lower than the target rotation speed 1000 r.pm, for example, 920 r.pm. Speed control is performed. That is, it is detected that the degree of unbalanced rotation is relatively large because the measurement time t is short. In this case, the final rotational speed of the rotating tub 3 is lower than the target rotational speed, thereby dehydrating while suppressing the occurrence of abnormal vibration and abnormal noise. Is carried out.

According to the present embodiment as described above, since the degree of unbalanced rotation is detected by detecting the deceleration degree of the motor 5, the unbalanced rotation can be reliably detected without being influenced by the biased state of the cloth in the rotating tub 3 or the like. . Then, if it is detected that the unbalanced rotation degree is relatively large because the measurement time t is 7 seconds or less, the speed is controlled so that the final rotational speed of the rotating tub 3 is set to 920r.pm lower than the target rotational speed 1000r.pm. The occurrence of abnormal vibration and abnormal noise can be prevented, and dehydration can be performed without stopping the dehydration operation even when the unbalanced rotation is naturally resolved.

4 shows the second embodiment of the present invention. In this embodiment, when the motor 5 is decelerated, the power supply mode of the motor 5 is the power supply mode of the main coil only. Is different from Also in this second embodiment, the same effects as in the first embodiment are obtained.

FIG. 5 shows a third embodiment of the present invention. In this embodiment, when the motor 5 is decelerated, both the main coil and the auxiliary coil of the motor 5 are disconnected. Is different from Also in this third embodiment, the same effects as in the first embodiment are obtained.

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 unbalanced motor, and the motor drive control circuit 32 for driving control of the motor 31 includes a drive circuit 33 having three pairs of switching elements, and an on-duty ratio of the switching elements. Control section (applied voltage changing means) 34 for controlling the change of the applied voltage to the motor 31 and controlling the rotational flow timing. In addition, the drive circuit 33 is provided with the DC power from the DC power supply circuit 35.

The control circuit 36 having a function as the dehydration control means applies a voltage V2 to the motor 31 when the dehydration operation is started, as shown in FIG. 7 (a), and is applied when the rotation speed of the rotating tank reaches 600r.pm. Change the voltage to voltage V3. The purpose of setting these voltages V3 and V2 is as follows.

That is, as shown in FIG. 8, the load line L1 has shown the load line at the time of dehydration normal rotation. In the load line L1, the torque of the motor 31 becomes TO at the applied voltage VO, and the rotation speed is 2000 r.p.m (the rotation speed of the rotating tub is 1000 r.p.m). Similarly, when the rotational speeds of the motor 31 are 1600r.p.m, 1200r.p.m, and 600r.p.m, the torques are T1, T2, and T3. That is, at the voltage V2, the rotating speed of the rotating tub increases to 600 r.p.m, and at the voltage V3, the rotating speed of the rotating tub finally decelerates to 300 r.p.m.

In this way, the control circuit 36 measures the time t at which the rotational speed of the rotating tub falls to 550 r.pm, and when the measurement time t exceeds the set reference time t1, the final rotational speed (the The rotational speed) is set to 1000 r.pm, and when the measurement time t is less than or equal to the reference time t1, the final rotational speed (rotational speed of the rotating tub) is controlled to be 920 r.pm. Also in this fourth embodiment, the same effects as in the first embodiment are obtained.

9 to 11 show a fifth embodiment of the present invention, in which the following points are different from the first embodiment. The triacs 41 and 42 are provided in the power supply circuit to the motor 5, and the zero cross detection circuit 43 which detects the zero cross of an AC voltage is provided. The triacs 41 and 42 are turned on in any one of the patterns shown in FIG. 10 by the control circuit 44 to phase-control the AC voltage. In the case of Fig. 10 (a), the conduction angle α is small, and in order of the tenth (b), the tenth (c), and the tenth (d) degrees, respectively, the application is performed by phase control in each pattern. The voltages are V3, V2, V1, and V0, respectively.

As shown in FIG. 11, the rotation speeds of 2000 r.p.m, 1840r.p.m, 1200r.p.m, and 600r.p.m at the voltages V3, V2, V1, and V0 in the dehydration normal load line L1, respectively.

The control circuit 44 is a dehydration control means, and when the dehydration operation starts, the phase control is conducted at the energization angle α as shown in FIG. 10 (b) to energize the motor 5, and the rotational speed of the motor 5 is increased. When it rises to 1st reference speed 1200r.pm (600r.pm at the rotational speed of a rotating tank), phase control is carried out at the energizing angle (alpha) as shown to FIG. 10 (a). In this way, when the motor 5 is decelerated and reaches the 2nd reference speed 1100r.pm (550r.pm at the rotational speed of the rotating tank), the measurement time until the 2nd reference speed at this deceleration (similar to the first embodiment) Based on t), the rotational speed of the motor 5 is controlled to either 2000r.pm (1000r.pm in the rotating tank) or 1840r.pm (920r.pm in the rotating tank). Also in this fifth embodiment, the same effects as in the first embodiment are obtained.

12 and 13 show a sixth embodiment of the present invention, in which the following points are different from the fifth embodiment. One power supply line of the AC power supply 51 is provided with PWM control means 54 consisting of a diode bridge circuit 52 and a switching transistor 53, and between the power supply lines of the AC power supply 51 during PWM control. A flywheel circuit 55 for discharging the energy accumulated in the inductance of the motor 5 and converting it to the power supply side is provided.

The control circuit 56 serving as the dehydration control means turns the switching transistor 53 on and off at an arbitrary duty ratio (figure 13 (a) shows a case where the duty ratio is 50%), and accordingly, the thirteenth (b) As shown in FIG. 8, the AC power is PWM controlled to change the voltage Va applied to the motor 5. In this case, when the motor 5 is decelerated, control is made to make the PWM duty ratio smaller than at the time of increasing the speed. The same effects as those in the first embodiment are also obtained in this sixth embodiment.

14 and 15 show a seventh embodiment of the present invention. In this seventh embodiment, a reference time setting means (control circuit 62 functions as a reference time setting means) while providing a power supply voltage detection circuit 61 which is a power supply voltage detection means for detecting the voltage of the power supply 12. Is different from the first embodiment.

The power supply voltage detection circuit 61 has resistors 63, 64, 65, 66, 67, a capacitor 68, and a diode 69 as shown in FIG.

The control circuit 62 sets the reference time as shown in Table 2 according to the detected voltage by the power supply voltage detection circuit 61, and compares the set reference time with the measurement reference time t to rotate the rotating tank. The final rotational speed (rotational speed of the motor 5) of (3) is controlled similarly to the first embodiment.

If the power supply voltage is low now, the motor torque also decreases at the deceleration time of the motor 5 in the auxiliary coil energization mode, and the deceleration degree is large and quickly reaches the second reference speed. On the contrary, when the power supply voltage is high, the motor torque increases in the deceleration period of the motor 5 in the auxiliary coil energization mode, and the deceleration degree is small and late to reach the second reference speed. For this reason, if the reference time is set constant regardless of the power supply voltage, the detection of the unbalance rotation accuracy will be incorrect.

However, according to the seventh embodiment, since 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, the degree of unbalance rotation is appropriately detected according to the power supply voltage. can do.

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

As shown in FIGS. 18 and 19, the temperature sensor 71 is provided on the outer bottom of the drip tank 2 via a mounting plate 73. The mounting plate 73 is a cover plate 74. As shown in FIG. Covered by). The temperature sensor 71 is provided with a sensor circuit 77 having a resistor 75 and an A / D converter 76, as shown in FIG. 17, and is subjected to signal processing by the sensor processing circuit 77. The temperature detection signal is provided 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 reference time is set shorter as the detection temperature is higher. The control circuit 72 compares this set reference time with the above-mentioned measurement time t to control the final rotational speed (rotational speed of the motor 5) of the rotating tub 3 in the same manner as in the first embodiment.

Thus the purpose of setting the reference time according to the water temperature is as follows. In other words, when the water temperature is high, the rigidity of the rotary tub 3, which is usually composed of synthetic resin, is slightly decreased. In case of dewatering rotation, deformation may be temporarily performed, and unbalancer rotation and abnormal vibration easily occur. However, in the eighth embodiment, the unbalanced rotation or abnormal vibration can be prevented by shortening the reference time at high water temperature at which unbalanced rotation or abnormal vibration is expected, and further, the reverse deformation of the rotating tub 3 can be prevented. Can be prevented.

In addition, the setting of the reference time may be performed in accordance with the power supply voltage and the temperature of the water supplied to the rotary tank 3, and in this case, the setting method may be as shown in Table 4 as the ninth embodiment of the present invention.

That is, under constant conditions, the reference time is set longer as the power supply voltage increases, and under the constant conditions, the reference time is set shorter as the water temperature increases. Therefore, when the water temperature is high due to the low power supply voltage, the reference time is set quite short. On the contrary, when the water temperature is low due to the high power supply voltage, the reference time is set quite long.

In addition, this invention is not limited to the above-mentioned and each Example shown to drawing, It can variously change and implement within the range which does not deviate from the summary.

The present invention controls the motor to decelerate after increasing the rotational speed of the motor to the first reference speed at the start of dehydration operation, as apparent from the above description, and from this deceleration start, the motor rotational speed drops to the second reference speed. When the measurement time is less than or equal to the reference time, the final dewatering rotation speed of the motor is changed to be lower than the target rotation speed. Therefore, unbalanced rotation can be reliably detected without being influenced by the deflection state of the cloth in the dehydration tank. Therefore, it is possible to prevent the occurrence of abnormal vibration and abnormal noise, and also to achieve the excellent effect of performing dehydration without stopping the dehydration operation when the unbalanced rotation is naturally resolved.

In addition, by detecting the power supply voltage and setting the reference time of the dehydration control means as long as the detection voltage is high, the unbalanced rotation can be reliably detected even if the power supply voltage is different without being influenced by the deflection condition of the cloth in the dehydration tank.

In addition, by detecting the temperature of the water supplied to the dehydration tank and setting the reference time of the dehydration control means as short as the detection temperature is high, even if the temperature of the water supplied to the dehydration tank is different, the balance of the cloth in the dehydration tank is not so much influenced by unbalance. Rotation can be detected reliably.

In addition, by detecting the power supply voltage and detecting the temperature of the water supplied to the dehydration tank and setting the reference time of the dehydration control means based on the detection result, it is possible to reliably detect the unbalance rotation in accordance with the power supply voltage and the water temperature.

Claims (10)

A motor for rotationally driving the dehydration tank; Rotational speed detecting means for detecting a rotational speed of the motor; And a control circuit for controlling the rotational speed of the motor in response to a signal from the rotational speed detecting means, wherein the control circuit comprises: a first circuit having a rotational speed of the motor lower than a target rotational speed at the start of dehydration operation; The motor is controlled to decelerate after raising to the reference speed, and the time from the start of the deceleration until the rotation speed of the motor drops to the second reference speed lower than the first reference speed is measured, and this measurement time exceeds the preset reference time. And dehydration control means for setting and changing the final dewatering rotational speed to the target rotational speed, and setting and changing the final dewatering rotational speed of the motor to a value lower than the target rotational speed when the measurement time is less than or equal to the reference time. washer. The reference time setting according to claim 1, further comprising a power supply voltage detecting means for detecting and supplying a power supply voltage to a control circuit, wherein the control circuit sets the reference time to be longer as the detection voltage of the power supply voltage detecting means is higher. Washing machine having means. 2. The reference time according to claim 1, wherein a temperature detecting means for detecting a temperature of water in the dehydration tank and supplying it to a control circuit is provided, wherein the control circuit sets the reference time to be shorter as the detected temperature of the temperature detecting means is higher. Washing machine having a setting means. The power supply voltage detecting means according to claim 1, further comprising a power supply voltage detecting means for detecting and supplying a power supply voltage to the control circuit and a temperature detecting means for detecting and supplying a temperature of water in the dehydration tank to the control circuit. And reference time setting means for setting the reference time on the basis of the detected voltage and the detected temperature of the temperature detecting means. 5. The motor according to any one of claims 1 to 4, wherein the motor is a capacitor starting type motor, and the switching means for switching between energizing both the main coil and the auxiliary coil of the motor and only the auxiliary coil. And the dehydration control means controls the power supply to both the main coil and the auxiliary coil when the motor is increased, and to supply only the auxiliary coil when the motor is decelerated. The motor according to any one of claims 1 to 4, wherein the motor is a condenser starting type motor, and the switching means for switching between energizing both the main coil and the auxiliary coil of the motor and only the main coil. And the dehydration control means controls the power supply to both the main coil and the auxiliary coil when increasing the motor, and to supply the power supply only to the main coil when decelerating the motor. The motor according to any one of claims 1 to 4, wherein the motor is a condenser starting type motor, and the case of energizing both the main coil and the auxiliary coil of the motor, and the case of disconnecting both the main coil and the auxiliary coil. And a switching means for switching, wherein the dewatering control means energizes both of the main coil and the auxiliary coil when increasing the motor, and controls both the main coil and the auxiliary coil to be energized when decelerating. 5. The motor according to any one of claims 1 to 4, wherein the motor is a direct current brushless motor, and includes an applied voltage changing means for changing an applied voltage to the motor, wherein the dehydration control means is used to increase the motor. The washing machine characterized by controlling so that an applied voltage may be made high and a deceleration is made low. 5. The motor according to any one of claims 1 to 4, wherein the motor is a capacitor starter type motor, comprising phase control means for energizing the main coil and the auxiliary coil of the motor, wherein the dehydration control means is configured to increase the motor. The washing machine characterized by controlling the energization angle of the said phase control means to increase, and to reduce the energization angle when decelerating. 5. The motor according to any one of claims 1 to 4, wherein the motor is a capacitor starter type motor, and includes PWM control means for energizing the main coil and the auxiliary coil of the motor, wherein the dehydration control means is configured to increase the motor. And the duty ratio of the PWM control means is increased at a time and the duty ratio is reduced at a time of deceleration.