JP2003190689A - Washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an abnormal vibration condition from continuing for a long period of time and to make a correction of laundry imbalance in a washing /spin-drying tub if a safety switch does not work and large vibration happens in a washing machine which carries out vibration judgment by laundry imbal ance when the washing/spin-drying tub is driven to rotate. <P>SOLUTION: An agitator is rotatably installed in a washing/spin-drying tub which is rotatably installed in a water-receiving tub. The washing/spin-drying tub or the agitator is driven by a motor 14. Water is supplied to the washing/ spin-drying tub through a water-supplying valve 10. The output signals from a current detection means 26 detecting the current when the motor 14 is driven and from a rotation rate detection means detecting the rotation rate of the motor 14 are inputted to a control means 18 controlling the operation of the motor 14 or the like. If the current detected by the current detection means 26 becomes equal to or larger than a predetermined value when the washing/ spin-drying tub is driven to a roughly steady rotation for spin-drying, the control means 18 transfers the operation to a correction sequence. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine for determining vibration due to an unbalance of laundry when a washing / dehydrating tub is rotationally driven.

[0002]

2. Description of the Related Art Conventionally, a washing machine has been constructed as shown in FIG. The configuration will be described below.

As shown in the figure, the washing machine outer frame 1 suspends a water receiving tank 3 by four suspension bars 2. The washing / dehydrating tub 4 is provided with a large number of water passage holes (not shown) on the entire outer peripheral surface and is rotatably arranged in the water receiving tub 3, and the stirring blade 5 is rotated on the bottom of the washing / dehydrating tub 4. Arranged freely. The motor 6 drives the stirring blade 5 and the washing / dehydrating tub 4 via the speed reducer 7.

The drain valve 8 drains water in the washing / dehydrating tub 4 through the drain hose 9, and the water supply valve 10 supplies water in the washing / dehydrating tub 4. Reference numeral 11 is an air trap, and 12 is a water level detecting means for detecting the water level in the water receiving tank 3. The control device 13 inputs data from the water level detection means 12, etc., controls the operation of the motor 6, the drain valve 8, the water supply valve 10, etc., and successively controls a series of steps such as washing, rinsing, and dehydrating.

The operation of the above structure will be described. In the washing process, water is supplied from the water supply valve 10 to wash and dehydrate the tub 4.
By switching and driving the stirring blades 5, the clothes put into the washing / dehydrating tub 4 are washed by applying a mechanical force. Also in the rinsing process, the same operation is performed with the drainage valve 8 sandwiching the drainage. In the dehydration process, the washing / dehydrating tub 4 is rotationally driven at high speed, and the clothes in the washing / dehydrating tub 4 are centrifugally dehydrated.

[0006]

In such a conventional structure, when the laundry in the washing / dehydrating tub 4 is unbalanced when the washing / dehydrating tub 4 is rotationally driven, the water receiving tub 3 vibrates greatly laterally and hits the outer frame 1 of the washing machine, and pushes up and down due to vertical vibration, causing noise, product movement,
There is a possibility of falling. Regarding this, a safety switch (not shown) is provided on the side of the outer frame 1 of the washing machine, and when a large vibration of the water receiving tub 3 is detected by this safety switch, it is stopped to ensure safety.

This safety switch often operates at the first resonance (mainly due to lateral shake) of the water receiving tank 3 immediately after the start of dehydration. However, in this method, although it has a safe stop function against a large lateral vibration above a predetermined level,
If the safety switch does not operate, the behavior of the vibration itself is unknown.

For this reason, the safety switch does not operate even with a relatively large shake during the first resonance, and when the spin-drying steady rotation speed rises, an abnormal vibration state occurs, and the vibration and noise of the product are large for a long time. However, there is a problem that it cannot be stopped immediately after detecting this.

Further, the vibration is small at the first resonance of the water receiving tub 3 immediately after the start of dehydration, but the unbalance is large when the laundry sticks in the washing / dehydrating tub 4 as the rotation speed of the dehydration increases. In this state, even when the dehydration steady rotation speed is reached, an abnormal vibration state occurs, but there is a problem that it cannot be stopped immediately after detecting this.

The present invention solves the above-mentioned conventional problems. When the safety stop function by the safety switch does not work and the dehydration steady rotation is started and a large vibration occurs,
By detecting this and stopping it, it is intended to prevent the abnormal vibration state from continuing for a long time and to correct the unbalance of the laundry in the washing / dehydrating tub.

[0011]

In order to achieve the above-mentioned object, the present invention has a stirring blade rotatably arranged in a washing / dehydrating tank rotatably arranged in a water receiving tank, so that washing / dewatering can be performed. A water tank or a stirring blade is driven by a motor, water is supplied into the washing / dehydrating tank by a water supply means, and output signals of a torque detection means for detecting a driving torque of the motor and a rotation speed detection means for detecting a rotation speed of the motor are controlled means. When the torque detected by the torque detecting means is equal to or more than a predetermined value during the substantially steady rotation of dehydration for driving the washing / dehydrating tub, the control means is configured to control the operation of the motor etc. This is to shift to the correction sequence.

Accordingly, when the dehydration steady rotation is reached without causing the safety stop function of the safety switch to operate and a large vibration occurs, the increase of the load torque applied to the motor is detected and the sequence is shifted to the correction sequence. Therefore, it is possible to prevent large vibration and noise due to the abnormal vibration state from continuing for a long time, and it is possible to correct the unbalance of the laundry in the washing / dehydrating tub.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is a washing and dehydrating tub which is rotatably disposed in a water receiving tub.
A stirring blade rotatably disposed in the washing / dehydrating tub, and a motor for driving the washing / dehydrating tub or the stirring blade
Water supply means for supplying water into the washing / dehydrating tub, torque detection means for detecting drive torque of the motor, rotation speed detection means for detecting rotation speed of the motor, torque detection means and rotation speed detection means And a control means for controlling the operation of the motor or the like by inputting the output signal of the above, and the control means controls the torque detected by the torque detection means during a substantially steady rotation of dehydration for driving the washing / dehydrating tub. It is designed to shift to the correction sequence when the value exceeds a predetermined value.The load torque required for the motor in order to maintain the dewatering steady state with the laundry in the washing and dewatering tub unbalanced Since it will be larger than usual, if the safe stop function of the safety switch does not work and the dehydration steady rotation is reached and large vibration occurs, the load torque applied to the motor will increase. The to be to shift to modify the sequence detection, can prevent large vibration and noise that continues for a long time due to an abnormal oscillation state, it is possible to perform unbalance correction of laundry in the washing and dewatering in the water tank.

According to a second aspect of the present invention, in the above-mentioned first aspect of the invention, the control means performs the correction sequence by supplying water into at least the water receiving tank and driving the stirring blades with the motor. By performing the stirring, the laundry can be made uniform in state, the balance can be improved, and then the laundry can be drained to reduce vibration during the next dehydration.

According to a third aspect of the present invention, in the above-described first or second aspect of the present invention, an informing means for performing an informing operation is provided, and the control means has an unbalanced laundry even if the correction sequence is repeated a predetermined number of times. If is not improved, it is to notify the abnormality by the notification means,
When it is determined that it is difficult to correct the unbalance of the laundry, the abnormality is notified to the user, and the user can correct the unbalance so that the operation can be continued and the usability can be improved.

According to a fourth aspect of the present invention, in the first aspect of the present invention, there is provided an input setting means for setting a driving course and the control means has a predetermined torque value by a special operation of the input setting means. Can be changed, and an appropriate determination can be made according to the vibration performance of the washing machine body. That is, the vibration performance of the main body of the washing machine is greatly affected by the variation of the components that make up the washing machine and the variation at the time of assembly.However, the vibration performance is grasped in advance and the abnormal state is judged according to this vibration performance. By changing the reference value for controlling, it is possible to ensure a predetermined vibration performance.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. The same components as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted.

(Embodiment 1) As shown in FIG.
4 is a DC brushless motor, and this motor 14
The driving force from is connected to the speed reducer 15, is decelerated at the time of washing, is transmitted to the stirring blade 5 at a reduction ratio of 6: 1, and is transmitted to the washing / dewatering tub 4 at the time of dewatering 1: 1.

That is, the motor 14 is 600 r / min
If it is rotated at 1, the rotation speed of the stirring blade 5 is 1 when washing.
The rotation speed of the washing / dewatering tub 4 is 600 r / min during the dehydration.

The position detecting means 16 is attached to the motor 14 and outputs a signal corresponding to the rotation of the motor 14 and inputs the signal to the control device 17.

As shown in FIG. 1, the control device 17 controls the operations of the drain valve 8, the water supply valve (water supply means) 10, the speed reducer 15, the motor 14, etc., and performs a series of steps such as washing, rinsing, and dehydrating. The control means 18 for sequentially controlling the

The control means 18 is composed of a microcomputer, inputs information from the input setting means 19 for setting a driving course, etc., and displays it on the display means (notifying means) 20 based on the information, and the user When the start of operation is set by the input setting means 19, the data from the water level detecting means 12 and the like are input and the operation of the drain valve 8, the water supply valve 10 and the speed reducer 15 is performed via the load driving means 21. Control the laundry operation.

At this time, the rotation control means 22 controls the rotation of the motor 14 by controlling the inverter circuit 24 via the drive circuit 23 based on the information from the position detection means 16.

The motor 14 is a DC brushless motor,
Although not shown, the stator has a three-phase winding and a rotor having two-pole permanent magnets arranged on the ring, and the stator is a first winding 14a forming a three-phase winding.
The second winding wire 14b and the third winding wire 14c are wound around an iron core provided with slots.

The inverter circuit 24 is composed of a switching element composed of a parallel circuit of a power transistor (IGBT) and a reverse conducting diode. Switching element 2
4a and a switching element 24b, a series circuit, a switching element 24c and a switching element 24d, a switching element 24e and a switching element 24f.
The series circuit of the switching elements is connected in parallel.

Here, both ends of the series circuit of switching elements are input terminals, a DC power source is connected thereto, and output terminals are connected to connection points of two switching elements constituting a series circuit of switching elements. The output terminal is
Depending on the combination of ON and OFF of the two switching elements that are connected to the three terminals of the three-phase winding, the U terminal, the V terminal, and the W terminal, and form a series circuit of switching elements, the U terminal and the V terminal
The terminal and the W terminal are set to three states of positive voltage, zero voltage, and open, respectively.

The switching elements are turned on and off by three position detecting means 16a, 16b, 16 composed of Hall ICs.
It is controlled by the rotation control means 22 based on the information from c. The position detecting means 16a, 16b, 16c are arranged on the stator so as to face the permanent magnets of the rotor at an electrical angle of 120 degrees.

As shown in FIG. 3, while the rotor makes one revolution, the three position detecting means 16a, 16b, 16c output pulses at the timings shown in the figure. The rotation control means 22 detects the timing of the arrow shown in the figure (when the state of the signal of any of the three position detection means changes), and detects the position detection means 16a, 16b, 1
By changing the ON / OFF states of the switching elements 24a to 24f based on the signal of 6c, the U terminal, the V terminal,
The W terminal is set to three states of positive voltage, zero voltage, and open, and the first winding 14a, the second winding 14b, and the third winding 1 of the stator are
A magnetic field is generated by 4c to rotate the rotor.

The switching elements 24a, 24c,
24e is PWM-controlled, and controls the rotation speed of the rotor by controlling the high and low conduction ratios at a repetition frequency of 10 kHz, for example. The rotation control means 22 includes three position detection means 16a, 16b, 1
Each time the state of any of the signals of 6c changes, the cycle is detected, the rotation speed of the rotor is calculated from the cycle, and the switching elements 24a, 24c,
PWM control of 24e.

The resistor 25 detects the current, and the current detecting means (torque detecting means) 26 detects the current flowing through the motor 14 based on the input current value of the inverter 24 at the voltage across the resistor 25. The motor 14 in this embodiment is a DC brushless motor, and the current-torque characteristics are proportional.

Therefore, by detecting the current flowing through the motor 14 by the current detection means 26 and inputting it to the control means 18, the operation equivalent to the input of the torque generated by the motor 14 can be performed.

The commercial power supply 27 is the diode bridge 2
It is connected to the inverter 24 via a DC power supply converter including a choke coil 29 and a smoothing capacitor 30. The storage means 31 is composed of a non-volatile memory or the like and stores various kinds of information necessary for washing operation, and the control means 18 reads the stored information from the storage means 31 when the power is turned on.

These are merely examples, and the configuration of the DC brushless motor 14 and the configuration of the inverter 24 are not limited to these.

The rotation control means 22, as shown in FIG.
A rotation speed detection means 22a for inputting a signal from the position detection means 16 to detect the rotation speed of the motor 14, a rotation speed setting means 22b for setting the rotation speed of the motor 14, a rotation speed setting means 22b and a rotation speed detection. From the rotation speed comparison means 22c for comparing the rotation speed detected by the means 22a, the rotation speed change amount detection means 22d for detecting the change amount of the rotation speed, the rotation speed comparison means 22c and the rotation speed change amount detection means 22d. Of the switching elements 24a, 24c, 24e in order to bring the rotation speed of the motor 14 close to the set rotation speed based on
Operation amount determining means 22e for determining the operation amount of the duty
And a duty ratio setting means 22f for setting the PWM duty of the switching elements 24a, 24c, 24e after being operated by the operation amount determining means 22e and outputting the PWM duty to the drive circuit 23.
And the PW of the switching elements 24a, 24c, and 24e gradually increased according to the elapsed time from the start of the motor 14.
The duty ratio storage means 22g stores the M duty and outputs it to the drive circuit 23.

In the rotation control means 22, when the motor 14 is started, the number of times the state of the signal of any of the three position detection means 16a, 16b, 16c changes is up to 3 times, that is, until the motor 14 rotates 1/2 rotation. Is a duty ratio storage means 2
The PWM circuit of the switching elements 24a, 24c, 24e is controlled by driving the drive circuit 23 with the output signal of 2g and thereafter the output signal of the conduction ratio setting means 22f.

FIG. 5 shows how the motor 14 rotates during washing. The motor 14 is turned on at 600 r / min, that is, the stirring blade 5 is turned on at 100 r / min for 1.6 seconds. With the second off, the forward and reverse rotation is repeated.

The operation of the above configuration will be described. The washing machine usually performs a washing process, a rinsing process, and a final dehydration process in this order. First, when laundry and detergent are put into the washing / dehydrating tub 4 and the operation is started, the washing process is performed by supplying water and driving the stirring blade 5 or the washing / dehydrating tub 4. After the washing process is completed, the water is drained, and the process proceeds to the rinsing process. Here, the intermediate dehydration and water supply are repeated several times to thoroughly rinse the laundry. After this, final dehydration is performed and the operation is terminated.

The control of the rotational speed during the intermediate dehydration and the final dehydration will be described with reference to FIG. As shown in FIG. 6A, the number of rotations of the washing / dehydrating tub 4 is first at time t1.
(For example, 10 seconds), the first rotation speed N1 (for example, 100 r
/ Min). If a large vibration occurs at the time of starting up to the first rotation speed N1, the water receiving tank 3
A safety switch (not shown) attached to the outer frame 1 side is operated to detect the vibration of the.

Next, by time t2 (for example, 1 minute), the second rotation speed N2 (for example, 200 r / min) is increased. As a result, the laundry is lightly attached to the washing / dehydrating tub 4, and is appropriately squeezed to lighten it to reduce vibration.

By the time t3 (for example, 2 minutes), the steady rotation speed Nc (for example, 800 r / min) is increased to firmly attach the laundry to the washing / dehydrating tub 4 so that the steady rotation speed Nc becomes constant. The laundry is dehydrated by controlling the rotation speed of the motor 14.

Further, regarding the motor current at this time,
Although the current starts to flow when the motor 14 is started, the current changes according to the torque required for the motor 14. The larger the gradient of the increase in the motor rotational speed, the larger the required torque, and once the steady rotational speed Nc is reached. When the rotation speed is reached, a torque sufficient to maintain the rotation speed is sufficient, so the change in the motor current corresponding to the change in the dehydration rotation speed is as shown in FIG. 6 (b).

In FIG. 6 (b), the curves (a) and (b) show the currents when the load applied to the motor 14 is small and large, respectively, and the curve (a) shows the laundry in a well-balanced washing / dehydrating tub. The curve (a) shows the steady rotation speed N when the laundry is unbalanced when it sticks and the vibration becomes small.
It is a state where it reaches c and causes abnormal vibration. Therefore, if the motor current continues to be equal to or more than the set value Ic in a state where the rotation speed is almost steady Nc, it can be detected that the vibration state is abnormal.

FIG. 7 shows a state when detecting an abnormal vibration state. The control means 18 first starts dehydration in step 50, and in step 51, the rotation speed of the motor 14 is shown in FIG. Feedback control is performed so that the set speed is achieved. The rotation speed feedback control of the motor 14 will be described later. Then, in step 52, the motor 14
Input the number of rotations of N and set N, and N is Nc in step 53.
(For example, 800 r / min) -20 r / min or more is determined, and if not, the process returns to step 51. Nc
If -20 r / min or more, go to step 54,
The timer 1 is started to perform the abnormal vibration detection operation.

At step 55, it is judged whether or not the dehydration time has ended, and if so, the dehydration operation is ended at step 56. Otherwise, in step 57, the rotation speed of the motor 14 is feedback-controlled as in step 51. Then, in step 58, the motor current is input from the current detection means 26 to be I, and in step 59, I is I
It is determined whether or not c (predetermined current value) or more, and if not, the timer 1 is cleared in step 60 and the process returns to step 55.

If so, in step 61, it is judged whether or not the timer 1 has reached 10 seconds, and if it is not 10 seconds, the process returns to step 55. If it is 10 seconds, the process proceeds to step 62 and the correction sequence. I do. That is, from step 55 to step 62, 1
If I ≧ Ic continuously for 0 seconds, the abnormal vibration state is detected and the correction sequence is performed.

Next, a correction sequence when an abnormal vibration state is detected will be described.

When the abnormal vibration state occurs, the unbalanced state of the laundry cannot be corrected no matter how many times the washing / dehydrating tub 4 is restarted. Therefore, as a correction sequence when the start-up of dehydration is poor, water is supplied into the water receiving tank 3 and the stirring blades 5 are stirred to make the laundry uniform in state, and then drained after balancing. Vibration is reduced and operation continues.

If the dehydration cannot be performed even after the correction sequence has been performed a predetermined number of times (for example, three times), it is difficult to correct the balance of the laundry, and the user is notified by an abnormal notification on the display means 20. By doing so, it is possible to have the user correct the balance state of the laundry and continue the operation.

FIG. 8 is a flow chart of the rotational speed feedback control subroutine of the motor 14. In step 70, the time until the signal state of any of the position detecting means 16a, 16b, 16c changes, that is, the motor 14 is moved. The rotation cycle is detected, and in step 71 the rotation cycle data is converted into rotation speed data. Then, in step 72, the variation ΔN of the rotation speed is calculated, and in step 73, the deviation Ne between the set rotation speed Ns and the current rotation speed Nai is calculated.

In step 74, P of the switching elements 24a, 24c and 24e is set based on the change amount ΔN and the deviation Ne.
The operation amount ΔDx of the WM duty is determined. Then, in step 75, the switching elements 24a, 24 that are currently outputting are set so that the rotation speed of the motor 14 becomes the set rotation speed.
The drive circuit 23 is driven so that the PWM duty of c and 24e is operated by ΔDx.

In this embodiment, the abnormal vibration state is detected after the motor rotational speed reaches the steady rotational speed of -20 r / min or more, but this is one method for speeding up the detection. Therefore, the detection may be performed after the steady rotation speed is reached.

Although the detection time is set to 10 seconds, this is one method for preventing erroneous detection even if the fluctuation of the motor current becomes large when the stability of the motor rotation control is poor. If the stability of control is improved and the detection time of the abnormal vibration state is shortened to 2 seconds or the like, a further effect is obtained.

(Embodiment 2) As shown in FIG. 9, the input setting means 19 includes a water level switch 19a, a washing switch 19b, a rinsing switch 19c and a dehydration switch for individually setting the water level, the washing time, the number of rinses and the dehydration time. Switch 19
Course setting switch 19 for setting "d" and "standard course", "lightly washing course", "goshoshi course", etc. having different washing times, rinsing times and dehydration times in the washing process
e, start of operation, start to enter a pause
It is composed of a pause switch 19f and a power switch 19g.

The display means 20 includes a water level display section 20a for displaying the water level, the washing time, the number of rinses and the dehydration time which are individually set by the water level switch 19a, the washing switch 19b, the rinsing switch 19c and the dehydration switch 19d, and the washing time display. The section 20b, the rinse count display section 20c, the dehydration time display section 20d, the remaining time display section 20e that displays the remaining time until the end of the operation, and the course display section 20f that displays the course set by the course setting switch 19e. I am configuring.

Therefore, the control means 18 uses the power switch 1
When 9g is pressed, it is determined whether the water level switch 19a and the washing switch 19b are pressed at the same time, and if they are pressed at the same time, a reference value for judging abnormal vibration (the motor current setting in the first embodiment described above). The value Ic) is corrected. The other structure is the same as that of the first embodiment.

The operation in the above configuration will be described. When the reference value is not corrected, an abnormal vibration state is detected when the motor current flows for 10 seconds or more Ic, but when it is corrected, for example, 0.8 × When the flow rate exceeds Ic, the abnormal vibration state can be detected, and the detection sensitivity can be increased.

Moreover, the correction of the reference value is stored in the storage means 31, and the abnormal vibration is judged by the corrected reference value in the subsequent operation.

Therefore, since the motor current set value for detecting the abnormal vibration state can be changed by a special operation of the input setting means 19, it is possible to make an appropriate judgment according to the vibration performance of the washing machine body. That is, the vibration performance of the main body of the washing machine is greatly affected by the variation of the components that make up the washing machine and the variation at the time of assembly.However, the vibration performance is grasped in advance and the abnormal state is judged according to this vibration performance. By changing the reference value for controlling, it is possible to ensure a predetermined vibration performance.

The present embodiment is an example of two methods of setting whether the reference value is to be corrected or not. This is a method of setting the reference value by properly combining various input switches and various display sections. If it can be corrected to a plurality of levels, the effect is further enhanced.

[0060]

As described above, according to the first aspect of the present invention, the washing / dehydrating tank rotatably disposed in the water receiving tank and the washing / dehydrating tank are rotatable. A stirring blade provided, a motor for driving the washing / dehydrating tub or the stirring blade, and a water supply means for supplying water to the washing / dehydrating tub.
Torque detection means for detecting the drive torque of the motor,
Rotation speed detection means for detecting the rotation speed of the motor, and control means for inputting output signals of the torque detection means and the rotation speed detection means to control the operation of the motor or the like, the control means comprising: When the torque detected by the torque detecting means becomes a predetermined value or more during the substantially steady rotation of the dehydration for driving the washing / dehydrating tub, the correction sequence is entered so that the safety stop function by the safety switch works. Even if the dehydration steady rotation is reached and a large vibration occurs, it is possible to prevent the large vibration and noise due to the abnormal vibration state from continuing for a long time, and the unbalance of the laundry in the washing and dehydration tub is corrected. be able to.

According to the second aspect of the present invention, the control means performs the correction sequence by supplying water to at least the water receiving tank and driving the stirring blades by the motor, so that the stirring is performed. Thus, the laundry can be made uniform in state, the balance can be improved, and then the laundry can be drained, so that the vibration during the next dehydration can be reduced.

According to the third aspect of the present invention, the notification means for performing the notification operation is provided, and the control means notifies the notification when the unbalance of the laundry is not improved even after repeating the correction sequence a predetermined number of times. Since the abnormality is notified by means, it is possible to continue driving by determining that it is difficult to correct the unbalance of the laundry and notifying the user by the abnormality notification, and having the user manually correct it. The usability can be improved.

Further, according to the invention described in claim 4, there is provided an input setting means for setting a driving course and the like, and the control means can change the predetermined value of the torque by a special operation of the input setting means. Therefore, it is possible to make an appropriate determination according to the vibration performance of the washing machine body. That is, the vibration performance of the main body of the washing machine is greatly affected by the variation of the components that make up the washing machine and the variation at the time of assembly.However, the vibration performance is grasped in advance and the abnormal state is judged according to this vibration performance. By changing the reference value for controlling, it is possible to ensure a predetermined vibration performance.

[Brief description of drawings]

FIG. 1 is a partially block circuit diagram of a washing machine according to a first embodiment of the present invention.

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

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

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

FIG. 5 is a timing chart when the washing machine is washing.

FIG. 6 is a timing chart when the washing machine is dehydrated.

[Fig. 7] Flowchart for dehydrating the washing machine

FIG. 8 is a flowchart of a feedback control subroutine of a motor rotation speed of the washing machine.

FIG. 9 is a front view of the operation display unit of the washing machine according to the second embodiment of the present invention.

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

[Explanation of symbols] 3 water receiving tank 4 washing and dewatering tank 5 stirring blades 10 Water supply valve (water supply means) 14 motor 18 Control means 22a Rotation speed detection means 26 Current detection means (torque detection means)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takeshi Fukuda             1-3-3 Umeda, Kita-ku, Osaka City, Osaka Prefecture             No. Excel Techno Co., Ltd. F term (reference) 3B155 AA06 BA04 BA16 BB02 CB06                       HB09 JB06 JC09 KA32 KA33                       LB26 LB35 LC07 MA02 MA05                       MA06 MA07 MA08 MA10

Claims (4)

[Claims] 1. A washing / dehydrating tank rotatably disposed in a water receiving tank, a stirring blade rotatably disposed in the washing / dehydrating tank, and the washing / dehydrating tank or the stirring blade. Motor, and water supply means for supplying water into the washing and dehydrating tub,
Torque detection means for detecting the drive torque of the motor,
Rotation speed detection means for detecting the rotation speed of the motor, and control means for inputting output signals of the torque detection means and the rotation speed detection means to control the operation of the motor or the like, the control means comprising: A washing machine adapted to shift to a correction sequence when the torque detected by the torque detecting means exceeds a predetermined value during a substantially steady rotation of dehydration for driving a washing / dehydrating tub. 2. The washing machine according to claim 1, wherein the control means carries out a correction sequence by supplying water to at least the water receiving tank and driving the stirring blades with a motor. 3. An informing means for performing an informing operation, wherein the control means informs the abnormality by the informing means when the unbalance of the laundry is not improved even after repeating the correction sequence a predetermined number of times. Or the washing machine described in 2. 4. The washing machine according to claim 1, further comprising input setting means for setting a driving course and the like, wherein the control means can change a predetermined value of the torque by a special operation of the input setting means.