CN1106481A

CN1106481A - Washing machine

Info

Publication number: CN1106481A
Application number: CN94115701A
Authority: CN
Inventors: 野野垣隆; 堀内伸秀; 今井雅宏; 牧野嘉幸
Original assignee: Toshiba Corp; Toshiba AVE Co Ltd
Current assignee: Toshiba Corp; Toshiba AVE Co Ltd
Priority date: 1993-08-26
Filing date: 1994-08-25
Publication date: 1995-08-09
Anticipated expiration: 2014-08-25
Also published as: CN1077172C; KR0149467B1; JPH07112094A; GB9417282D0; KR950006094A; GB2281417B; TW245751B; JP3152819B2; GB2281417A

Abstract

The invention relates to a washing machine which 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. When rotational speed of a motor 5 increases to a first reference speed, control circuit 21 decelerates 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

Washing machine

The present invention relates to a kind of washing machine, this washing machine has countermeasure to its uneven revolution.

As everyone knows, the outside of the laundry machine dehydration cylinder uneven sense switch of revolution that uneven test rod is housed and is switched on or switched off according to test rod action.When the dehydration cylinder seriously touches test rod because of turning round imbalance, then uneven sense switch action, dehydration cylinder (motor) stops revolution.

But, the said structure that the past adopts, because of the bias state of clothing in the dehydration cylinder, the cylinder that dewaters does not sometimes touch test rod and can't detect the revolution imbalance, speed of gyration rising in this state.This occasion can be regarded dehydration cylinder raising speed produces bigger vibration and noise to the final goal speed of gyration state and uneven turn state as and separate the sort of state that disappears naturally.Certainly, do not turn round under the unbalanced occasion, speed of gyration also will raise.

The present invention puts forward in view of the above problems, the purpose of this invention is to provide a kind of washing machine, arranged by the clothing bias state, it is uneven to detect revolution exactly, not only prevent the generation of abnormal vibrations and noise, and turn round quilt in imbalance and separated under the situation about disappearing naturally, can not stop dehydration running ground and dewater.

For addressing the above problem, the present invention adopts following means.

First kind of means is characterised in that: this washing machine is provided with makes the rotating motor of dehydration cylinder, detect the speed of gyration detection means of this motor speed of gyration and the control device of dewatering; This dehydration control device makes the motor speed of gyration rise to the 1st reference speed when dehydration running beginning, afterwards, this motor is slowed down, when measure slowing down beginning when motor speed drops to the 2nd reference speed the used time, if minute is less than fiducial time, then change motor final dewatering speed of gyration, make it less than the target speed of gyration.

Second kind of means is characterised in that: on the 1st means formation base, the detection voltage that is provided with the supply voltage detection means that detects supply voltage and this supply voltage detection means is set at long more fiducial time and sets means high more fiducial time of then dewatering control device.

The third means are characterised in that: on the 1st means formation base, the detected temperatures that is provided with the temperature detection means of temperature that detect to supply with the water in the dehydration cylinder and these temperature detection means is set at short more fiducial time and sets means high more fiducial time of then dewatering control device.

The 4th kind of means are characterised in that: on the 1st means formation base, be provided with the supply voltage detection means that detects supply voltage, the temperature detection means that detect the temperature of supplying with the water in the dehydration cylinder and according to setting means the fiducial time that the testing result of above-mentioned supply voltage detection means and temperature detection means is set the fiducial time of dehydration control device.

The 5th kind of means are: in the 1st to the 4th arbitrary means, motor is made of capacitor start type motor, the dehydration control device is provided with switch means, can switch to this motor main coil, secondary coil both sides "on" position and have only the secondary coil "on" position, in the time will making the motor speedup, make the major and minor coil both sides energising of this motor, when motor is slowed down, only make the secondary coil energising, control.

The 6th kind of means are: in the 1st to the 4th arbitrary means, motor is made of capacitor start type motor, the dehydration control device is provided with switch means, the state that can switch to this motor main coil, secondary coil both sides "on" position and have only main coil to switch on, in the time will making the motor speedup, make the major and minor coil both sides energising of this motor, when motor is slowed down, only make the main coil energising, control.

The 7th kind of means are: in the 1st to the 4th arbitrary means, motor is made of capacitor start type motor, the dehydration control device is provided with switch means, can switch to the state of this motor main coil, secondary coil both sides "on" position and motor main coil, secondary coil both sides outage, in the time will making the motor speedup, make the major and minor coil both sides energising of this motor, when motor is slowed down, make the major and minor coil both sides outage of this motor, control.

The 8th kind of means are: in the 1st to the 4th arbitrary means, motor is made of dc brushless motor, and the dehydration control device is provided with the voltage change means that make the voltage change that is applied on this motor, when motor is slowed down, low when making the voltage ratio speedup that is applied on this motor, control.

The 9th kind of means are: in the 1st to the 4th arbitrary means, motor is made of capacitor start type motor, and the dehydration control device is provided with the phase controlling means, when motor is slowed down, make the angle of flow that is applied to the voltage on this motor little during than speedup, carry out phase controlling.

The 10th kind of means are: in the 1st to the 4th arbitrary means, motor is made of capacitor start type motor, and the dehydration control device is provided with the PWM control device with PWM control AC power, when motor is slowed down, dutycycle when making the PWM dutycycle than speedup is little, controls.

Dehydration cylinder speed of gyration rises to institute decide speed of gyration after, if make the motor deceleration, its deceleration speed degree is with to turn round uneven big or small degree relevant.That is, the situation that uneven degree is big is compared with little situation, and the revolution inertia force of dehydration cylinder is little, and it is fast to slow down.

And means of the present invention can be judged the uneven degree size of revolution.Method is: during dehydration running beginning, after the motor speed of gyration reaches the 1st reference speed, this motor is slowed down, measure motor and slow down beginning to dropping to the used time of the 2nd reference speed, judge the uneven degree size of revolution according to this minute.And, in means of the present invention, when minute during less than fiducial time, that is to say when the uneven degree of revolution is big, change the final dewatering speed of motor, make it less than the target speed of gyration, therefore, can not produce vibration and noise, and can finish the dehydration running.In addition, when imbalance revolution is separated when disappearing naturally, finish to dewater and turn round by not stopping dehydration running ground.

Accompanying drawing has been represented embodiments of the invention, wherein:

Fig. 1 is the present invention the 1st embodiment electric loop figure;

Fig. 2 is the washing machine longitudinal sectional drawing;

Fig. 3 is electrical power pattern and velocity variations key diagram;

Fig. 4 is the present invention's the 2nd embodiment key diagram (suitable with Fig. 3);

Fig. 5 is the present invention's the 3rd embodiment key diagram (suitable with Fig. 3);

Fig. 6 is the 4th embodiment electrical structure block diagram;

Fig. 7 is that the applied voltage and the cylinder speed of gyration of motor changes key diagram;

Fig. 8 is motor speed and moment of torsion graph of a relation;

Fig. 9 is the 5th embodiment electric loop figure;

Figure 10 is phase controlling waveform pattern figure;

Figure 11 is motor speed and moment of torsion graph of a relation;

Figure 12 is the 6th embodiment electric loop figure;

Figure 13 is switch triode break-make pattern and voltage waveform graph of a relation;

Figure 14 is the 7th embodiment electric loop figure;

Figure 15 is that supply voltage detects loop diagram;

Figure 16 is the 8th embodiment electric loop figure;

Figure 17 is the sensing loop electric diagram;

Figure 18 is the washing machine longitudinal sectional drawing;

Figure 19 is a temperature sensor installation position longitudinal sectional drawing;

Symbol is represented respectively among the figure: 3-rotary cylinder (dehydration cylinder), the 5-motor, the 19-switch means, 20-speed of gyration detection means, 21-control loop (dehydration control device), the 31-motor, 32-motor-driven control loop, 36-control loop (dehydration control device), 41, the 42-controllable silicon, 44-control loop (dehydration control device), 54-SWM control device, 56-control loop (dehydration control device), the 61-supply voltage detects loop (supply voltage detection means), 62-control loop (dehydration control device, set means fiducial time), 71-temperature sensor (temperature detection means), 72-control loop (dehydration control device, set means fiducial time), the 77-sensor loop.

Describe with reference to Fig. 1-Fig. 3 with regard to the 1st embodiment of the present invention below.Fig. 2 is the longitudinal sectional drawing that has the washing machine of dehydration concurrently.The inside of outer container 1 is water tank 2, and the inside of this water tank 2 is the rotary cylinders 3 that are also used as washing tank and dehydration cylinder.The bottom of these rotary cylinder 3 inside is agitators 4.The bottom of water tank 2 outsides is to serve as the main mechanism 6 that constitutes with capacitor start motor 5, and the drainpipe of the bottom of water tank 2 is provided with draining valve 7.Above-mentioned motor 5 is also used as rinsing maching and dehydration electric motor.

The interior rear wall of the top cover 8 on outer container 1 top is provided with water injection valve 9 and level sensor 10, and control module 11 is equipped with in its anterior inside.In the aforementioned mechanism 6 deceleration device is housed, during dehydration, is delivered to rotary cylinder 3 after the speed of gyration of motor 5 reduces by half.In addition, the inner and upper of outer container 1 be provided with the test rod that detects water tank 2 swings and with the corresponding uneven sense switch of action of bar, the swing of water tank 2 is caused by the imbalance revolution of rotary cylinder 3.

Fig. 1 is an electrical structure diagram.The shared binding post 5a and AC power 12 1 ends of motor 5 join, and other two

terminal

5b, 5c of motor 5 join by the other end of

controllable silicon

13,14 and AC power 12 respectively.And

terminal

5b, 5c are connected on an end of

controllable silicon

15,16, and the other end of

controllable silicon

15,16 is connected on the other end of AC power 12 by shared starting capacitance 17 and coil 18.In addition, above-mentioned

controllable silicon

13,14,15,16 has constituted switch means 19.Motor 5 and electric motor starting electric capacity 17 have constituted capacitor start type motor.

Be provided with speed detector 20 in the motor 5, for example the speed that is made of Hall element detects the loop.Detected thus signal will be sent to control loop 21.

Control loop 21 is made of microcomputer, gate circuit and A/D converter.This control loop 21 adds that above-mentioned switch means 19 has the function of dehydration control device.Control loop 21 control

controllable silicons

13,14 break-makes, and pass through the break-make that

photoelectrical coupler

22,23 is controlled

controllable silicons

15,16.

The break-make combination of motor 5 by controllable silicon 13-16 switches to encloses powered-on mode, main coil powered-on mode, secondary coil powered-on mode completely.Break-make combination and the relation between the powered-on mode of controllable silicon 13-16 are as shown in table 1.

Table 1

Enclose under the powered-on mode completely,

controllable silicon

13,16 energisings, 14,15 outages, the coil 5e of motor 5 is not energized by starting capacitance 17 and coil 18, and coil 5d switches on by starting capacitance 17 and coil 18.So, at this moment, the suitable main coil of 5e, the suitable secondary coil of 5d is the fully energized pattern of main and sub-coil energising.

Under the main coil powered-on mode, have only controllable silicon 13 energisings, only coil 5e does not switch on by starting capacitance 17 and coil 18.Under the secondary powered-on mode, have only controllable silicon 16 energisings, only coil 5d switches on by starting capacitance 17 and coil 18.

Control loop 21 is accepted the signal that transmits from the various switches 24 that have control module 11, also has the output signal of level sensor and speed of gyration checkout gear 20 in addition.And control loop 21 is by its inside solidification program controlled motor 5, draining valve 7, water injection valve 9 and have the display window 25 of control module 11, and control washing, rinsing and dehydration when particularly dewatering, have following function.

That is, during the dehydration beginning, the break-make of the controllable silicon 13-16 of switch means 19 adopts fully energized pattern (major and minor coil is all switched on), and motor 5 energisings make rotary cylinder 3 revolutions under this pattern.If this moment, the revolution imbalance of rotary cylinder 3 was excessive, then detect and make motor 5 outages by test rod and the sense switch of not expressing among the figure., this mechanical detection means, even there is uneven revolution to produce sometimes, but because the bias state of clothing, water tank 2 can not touch test rod and can not detect uneven revolution.Certainly, do not produce uneven revolution, just can not detect yet if.

As mentioned above, do not detect under the uneven rotating state at test rod and sense switch, the speed of gyration of rotary cylinder 3 rises as shown in Figure 3.And the rotating speed one of rotary cylinder 3 reaches the 1st reference speed such as the 600rpm(motor speed is 1200rpm), the break-make pattern of the controllable silicon 13-16 of switch means 19 becomes the secondary coil powered-on mode, makes motor 5 energisings in this powered-on mode.

Under the secondary coil powered-on mode, the output torque of motor 5 is littler than the unloaded moment of torsion of dehydration, and motor 5 must slow down.Its degree of deceleration is relevant with the uneven degree of the revolution of rotary cylinder 3.In other words, turn round the big occasion of the uneven degree occasion littler than degree and come, the revolution inertia force of rotary cylinder 3 is little, and it is fast to slow down.

Control loop 21 picks up counting when slowing down beginning, when the speed of gyration of rotary cylinder 3 is reduced to second reference speed such as 550rpm(motor speed this moment is 1100rpm) time, timing stops.As this minute t during greater than fiducial time (this state down setting value be 7 seconds) (solid line K1 in reference to figure 3a), the final speed of rotary cylinder 3 is elevated to its target speed of gyration and keeps this speed, and the dewatering time rear motor of process setting shuts down.That is, when minute t was longer, it was less to turn round uneven degree, even fully produce uneven revolution in other words, this system also can detect its ruuning situation and dewater by normal condition.

In addition, as minute t during less than 7 seconds (with reference to the dotted line K2 among Fig. 3 a), it is following as 920rpm that the speed of gyration of rotary cylinder 3 is controlled at its target speed of gyration 1000rpm.That is to say that because minute is short, predicting it, to turn round uneven degree bigger.At this moment, the final speed of gyration of rotary cylinder 3 is dropped to littler, suppress the generation of abnormal vibrations and noise, dewater than target speed of gyration.

According to present embodiment owing to detect the uneven degree of revolution by the degree of deceleration that detects motor 5, so detect accurately and not be subjected to cylinder 3 interior clothing bias states about.And as minute t during less than 7 seconds, can detecting it, to turn round uneven degree bigger.But because the final speed of gyration 920rpm of control rotary cylinder 3 is lower than its target speed of gyration 1000rpm, not only can prevent the generation of abnormal vibrations and noise, and, separated naturally in imbalance revolution and also can continue when disappearing to dewater with shutting down.

Fig. 4 is the 2nd embodiment of the present invention.This embodiment has only a bit different with the 1st embodiment: when motor 5 is slowed down, adopt the main coil powered-on mode.The 2nd embodiment is identical with the 1st embodiment effect.

Fig. 5 is the 3rd embodiment of the present invention.The difference of this embodiment and the 1st embodiment is: when motor 5 is slowed down, adopt the mode of the major and minor coil both sides outage of motor 5.Its effect is identical with the 1st embodiment.

Fig. 6-Fig. 8 is the 4th embodiment of the present invention.This embodiment has following different with the 1st embodiment: motor 31 is DC brushless motor, the motor-driven control loop 32 of this motor 31 of drive controlling by the driving loop 33 of containing three pairs of switch elements and the dutycycle of controlling this switch element make the voltage change that is applied to motor 31, the control part 34(that controls the in good time change of current simultaneously applies the voltage change means) constitute.Direct current power in the driving loop 33 is from dc power supply circuit 35.

Have as the control loop 36 of dehydration control device function when the dehydration beginning shown in Fig. 7 a, motor 31 is applied voltage V2.When the rotary cylinder rotating speed reaches 600rpm, apply voltage and become V3.The reason of setting voltage V3, V2 is: promptly, as shown in Figure 8, and the load line when load line L1 represents to dewater permanent the revolution.For load line L1, when applying voltage and be V0, Motor torque is T0, and it is that the speed of 2000rpm(rotary cylinder is 1000rpm with rotary speed) same, when the rotating speed of motor 31 is 1600rpm, 1200rpm, 600rpm, correspond respectively to torque T 1, T2, T3.In other words, when voltage was V2, rotary cylinder speed rose to 600rpm, and the rotary cylinder rotating speed finally dropped to 300rpm when voltage was V3.

Used time t when control loop 36 is measured the rotary cylinder speed drops to 500rpm, when minute t greater than fiducial time during t1, the final speed of gyration of rotary cylinder is got 1000rpm; If minute is greatly less than t1 fiducial time, then controlling the rotary cylinder final speed is 920rpm.This embodiment is identical with the 1st embodiment effect.

Fig. 9-Figure 11 is the present invention the 5th embodiment.This embodiment and the 1st embodiment have following difference: the current supply circuit of motor 5 is provided with

controllable silicon

41,42 and detects zero level detection loop 43 compositions of alternating voltage zero level.Control loop 44 control

controllable silicons

41,42 are pressed arbitrary situation conducting among Figure 10, promptly become the phase controlling of alternating voltage.The angle of flow α of Figure 10 a occasion is little, and angle of flow α increases in proper order by Figure 10 b, c, d respectively, and the voltage that applies of the phase controlling under the various situations is respectively V3, V2, V1, V0.Among Figure 11, on the permanent load line L1 of dehydration, when each voltage was V3, V2, V1, V0, Dui Ying motor speed of gyration was 2000rpm, 1840rpm, 1200rpm, 600rpm respectively.

Control loop 44 is dehydration control devices, during dehydration running beginning, make motor 5 energisings by the angle of flow control phase among Figure 10 b, the speed of gyration that the speed of gyration of motor 5 arrives the 1st reference speed 1200rpm(rotary cylinder is 600rpm) time, press angle of flow α control phase shown in Figure 10 a, motor 5 slows down, when arriving the 2nd reference speed 1100rpm(rotary cylinder rotating speed is 550rpm) time, identical with the 1st embodiment, begin minute t when reducing to the 2nd reference speed by deceleration, the rotating speed of control motor 5 is 2000rpm(rotary cylinder rotating speed 1000rpm) or for 1840rpm(rotary cylinder rotating speed be 920rpm).The 5th embodiment and embodiment 1 have equal effect.

Figure 12-Figure 13 is the 6th embodiment of the present invention.Present embodiment has following difference with the 5th embodiment: a side's of AC power 51 power line is connected to PWM control device 54, and these means are made up of diode bridge loop 52 and triode switch 53.In addition, be connected to synchronous inertance loop 55 between two power lines of AC power 51, when PWM controlled, this loop made the energy discharge of accumulating in motor 5 inductance coils, towards the mains side conversion.

Control loop 56 with dehydration control device function is with any dutycycle gauge tap triode 53 break-makes (Figure 13 a is that dutycycle is 50% o'clock a situation), and, shown in Figure 13 b, alternating current is carried out PWM control, the voltage Va that is applied on the motor 5 is changed.The PWM dutycycle of PWM dutycycle when in the case, control motor 5 slows down during less than the motor speedup.The 6th embodiment has with the same effect of the 1st embodiment.

Figure 14 and Figure 15 represent the 7th embodiment of the present invention.The difference of the 7th embodiment and the 1st embodiment is: be provided with the supply voltage as the supply voltage detection means that detects power supply 12 voltages and detect loop 61, be provided with the means of setting fiducial time (control loop 62 has the function of the means of setting fiducial time) simultaneously.As shown in figure 15, above-mentioned supply voltage detects loop 61 and is made of resistance 63,64,65,66,67, electric capacity 68 and diode 69.

Control loop 62 is as shown in table 2 according to the detection voltage setting said reference time that supply voltage detects loop 61.Fiducial time and the said determination time t of this setting is compared, by the final speed of gyration (speed of gyration of motor 5) of the method control rotary cylinder 3 identical with embodiment 1.

Table 2

When motor 5 was slowed down, if supply voltage is low, Motor torque diminished so, and degree of deceleration is big, and it is few that motor 5 was decelerated to for the 2nd reference speed time spent.On the contrary, if the supply voltage height, it is big that Motor torque becomes, and degree of deceleration is little, and it is consuming time many to arrive the 2nd reference speed.Therefore, be and the constant of independent of power voltage to make the uneven degree of detected revolution incorrect if set fiducial time.

Yet, as shown in table 2, in the present embodiment, when supply voltage hangs down, will be set at fiducial time shorter, when supply voltage is high, will be set at fiducial time longer, so, can with supply voltage correctly detect accordingly the revolution unbalanced degree.

Figure 16-Figure 19 is the 8th embodiment of the present invention, present embodiment with the difference of implementing 1 is: be provided with the temperature sensor 71 as the temperature detection means that detects the temperature of supplying with the water in the rotary cylinder 3, and be provided with the means of setting fiducial time (control loop 72 has the function of the means of setting fiducial time).

Shown in Figure 18,19, said temperature sensor 71 is contained in the outer bottom of water tank 2 by installing plate 73, and this installing plate 73 is covered by cover plate 74.As shown in figure 17, be provided with sensor loop 77 on temperature sensor 71, it comprises resistance 75 and A/D converter 76, carries out the temperature detection signal of signal processing through this loop and will pass to control loop 72.

After said temperature detection signal (detected temperatures) is passed to control loop 72, control loop 72 according to this detected temperatures signal by setting fiducial time shown in the table 3.As shown in Table 3, detecting temperature, high more then to set fiducial time short more.And control loop 72 is the fiducial time and the aforesaid minute t of this setting relatively, and is identical with embodiment 1, the final speed of gyration (rotating speed of motor 5) of control rotary cylinder 3.

As above setting the reason of fiducial time according to water temperature is: when water temperature was high, generally the rigidity of the rotary cylinder of being made by synthetic resin 3 had decline slightly.And temporary transient distortion takes place in rotary cylinder sometimes during the dehydration revolution, easily causes the generation of uneven revolution and extraordinary noise.Thereby, in the 8th embodiment, in the time predicting the higher water temperature that produces uneven revolution and abnormal vibrations,, prevent the generation of uneven revolution and abnormal vibrations, and then prevent the plastic deformation of rotary cylinder 3 by shortening fiducial time.

The setting of said reference time also can be carried out according to the temperature of the water in supply voltage and the supply rotary cylinder 3, and at this moment, its establishing method can be as shown in table 4 as the 9th embodiment of the present invention.

That is, under the certain condition of water temperature, supply voltage is high more, and it is long more to set fiducial time; Under the certain situation of supply voltage, water temperature is high more, and it is short more to set fiducial time.Therefore, low when supply voltage, when water temperature is high, setting-up time is just quite short; When the supply voltage height, when water temperature is low, the fiducial time that sets is just quite long.

In addition, the present invention is not limited to above-mentioned explanation and illustrated embodiment, has a variety of modification to implement in the scope that does not break away from its main points.

As mentioned above, the present invention is after dehydration beginning motor speed of gyration reaches the 1st reference speed, the control motor slows down, measure to slow down the used time when the motor speed of gyration reaches the 2nd reference speed that begins, when minute during less than fiducial time, change the final rotating speed of motor and make it to be lower than the target speed of gyration, therefore, the dominations such as clothing bias state of not too being dewatered in the cylinder, detect uneven revolution exactly, thereby, not only can prevent abnormal vibrations and abnormal sound, and separated naturally when disappearing not returning weighing apparatus revolution, dewater with not stopping the dehydration running.

In addition, by the detection supply voltage, when making supply voltage high more, the fiducial time of the dehydration control device of setting is long more, like this, even mains voltage variations, usually also can detect uneven revolution exactly, and not too be subjected to the domination of clothing bias state in the rotary cylinder etc.

By, detecting the temperature of supplying with in the dehydration cylinder, this detected temperatures is high more, set the fiducial time of dehydration control device short more, like this, even supply with the variations in temperature of the water in the dehydration cylinder, also can detect uneven revolution exactly, and not too be subjected in the rotary cylinder domination such as clothing bias state.

By detecting the temperature of the water in supply voltage and the supply rotary cylinder,, can detect uneven revolution exactly according to supply voltage and water temperature usually according to the fiducial time of testing result setting dehydration control device.

Claims

1, a kind of washing machine is provided with and makes the rotating motor of dehydration cylinder, detects the speed of gyration detection means of this motor speed of gyration and the control device of dewatering; Said dehydration control device made after the motor speed of gyration rises to the 1st reference speed in when beginning dehydration running, this motor is slowed down, when measure slowing down beginning when rotating speed drops to the 2nd reference speed the used time, if minute is less than fiducial time, then change motor final dewatering speed of gyration, make it less than the target speed of gyration.

2, a kind of washing machine, the detection voltage that is provided with the speed of gyration detection means, dehydration control device, the supply voltage detection means that detects supply voltage and this supply voltage detection means that make the rotating motor of dehydration cylinder, detect this motor speed of gyration is high more then will set the means of setting long more fiducial time fiducial time; Said dehydration control device makes the motor speed of gyration rise to the 1st reference speed when dehydration running beginning, afterwards, this motor is slowed down, when measure slowing down beginning when rotating speed drops to the 2nd reference speed the used time, if minute is less than fiducial time, then change motor final dewatering speed of gyration, make it less than the target speed of gyration.

3, a kind of washing machine, the detected temperatures that is provided with the speed of gyration detection means, dehydration control device, the temperature detection means that detect the water in the above-mentioned dehydration cylinder of supply and these temperature detection means that make the rotating motor of dehydration cylinder, detect this motor speed of gyration is high more then will set the means of setting short more fiducial time fiducial time; Said dehydration control device makes the motor speed of gyration rise to the 1st reference speed when dehydration running beginning, afterwards, this motor is slowed down, when measuring motor and slowing down beginning when rotating speed drops to the 2nd reference speed the used time, if, then changing motor final dewatering speed of gyration less than fiducial time, minute make it less than the target speed of gyration.

4, a kind of washing machine is provided with speed of gyration detection means, dehydration control device, the supply voltage detection means that detects supply voltage that makes dehydration cylinder rotating motor, detects this motor speed of gyration, the temperature detection means that detect the temperature of supplying with the water in the above-mentioned dehydration cylinder and according to setting means the fiducial time that the testing result of above-mentioned supply voltage detection means and these temperature detection means is set fiducial time; Said dehydration control device makes the motor speed of gyration rise to the 1st reference speed when dehydration running beginning, afterwards, this motor is slowed down, when measuring motor and slowing down beginning when rotating speed drops to the 2nd reference speed the used time, if, then changing motor final dewatering speed of gyration less than fiducial time, minute make it less than the target speed of gyration.

5, as the washing machine of each record among the claim 1-4, it is characterized in that, motor is made of capacitor start type motor, the dehydration control device is provided with switch means, can switch to the state and the state that has only the secondary coil energising of the major and minor coil both sides energising of this motor, in the time will making the motor speedup, make the major and minor coil both sides energising of this motor, when motor is slowed down, only make the secondary coil energising, control.

6, as the washing machine of each record among the claim 1-4, it is characterized in that, motor is made of capacitor start type motor, the dehydration control device is provided with switch means, and the state that can switch to the major and minor coil both sides "on" position of this motor and have only main coil to switch on is in the time will making the motor speedup, make the major and minor coil both sides energising of this motor, when motor is slowed down, only make the main coil energising, control.

7, as the washing machine of each record among the claim 1-4, it is characterized in that, motor is made of capacitor start type motor, the dehydration control device is provided with switch means, can switch to the state of major and minor coil both sides energising of this motor and the state of major and minor coil both sides outage, in the time will making the motor speedup, make the major and minor coil both sides energising of this motor, when motor is slowed down, make the major and minor coil both sides outage of this motor, control.

8, as the washing machine of each record among the claim 1-4, it is characterized in that, motor is made of dc brushless motor, the dehydration control device is provided with the voltage change means that make the voltage change that is applied on this motor, in the time will making the motor reduction of speed, make the major and minor coil both sides energising of this motor, when motor is slowed down, low when making the voltage ratio speedup that is applied on this motor, control.

As the washing machine of each record among the claim 1-4, it is characterized in that 9, motor is made of capacitor start type motor, the dehydration control device is provided with the phase controlling means, when motor is slowed down, make the angle of flow that is applied to the voltage on this motor little during than speedup, carry out phase controlling.

As the washing machine of each record among the claim 1-4, it is characterized in that 10, motor is made of capacitor start type motor, the dehydration control device is provided with the PWM control device with PWM control AC power, when motor is slowed down, little when making the PWM dutycycle than speedup, control.