JP2000024372A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct an unbalance of a laundry in a spinning tub, in a washing machine wherein, when the tub is rotated, vibrations due to an unbalance of a laundry is determined, by a method wherein, when a safety stop function using a safety switch does not work and hence a large vibration occurs, the vibration is sensed to effect a safety stop so that an abnormal vibration can be prevented from being generated to ensure the safety of the washing machine. SOLUTION: A spinning tub or a mixing blade rotatably disposed in a water receiving tank is driven by a motor 13, and when the motor 13 is actuated, currents thereof are sensed by a current sensing means 28 and the number of revolution of the motor 13 is sensed by a revolution number sensing means. Output signals of the means 28 are inputted into a control means 19 to control the action of the motor 13 or the like based on sensing results of the revolution number sensing means. At the rise time of revolution of the spinning tub, when a current sensed by the means 28 becomes equal to a first value or more only during a first predetermined time, a transition is made from the control means 19 to a correction sequence.

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 judging vibrations due to imbalance of laundry when a washing and spin-drying tub is rotated.

[0002]

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

[0003] As shown in the figure, a washing machine outer frame 1 has a water receiving tub 3 suspended by four suspension rods 2. The washing and dewatering tub 4 is provided with a large number of water passage holes 5 on the entire outer peripheral portion thereof, and is rotatably disposed in the water receiving tub 3. A stirring blade 6 is rotatably disposed at the bottom of the washing and dewatering tub 4. are doing. The motor 7 drives the stirring blade 6 and the washing / dewatering tub 4 via the reduction gear 8.

A drain valve 9 drains the water in the washing and dewatering tub 4 through a drain hose 10, and a water supply valve 11 is provided for the washing and dewatering tub 4.
Water is supplied inside. The control device 12 controls operations of the motor 7, the drain valve 9, the water supply valve 11, etc., and performs washing, rinsing,
A series of processes such as dehydration are controlled sequentially.

The operation of the above construction will be described. In the washing process, water is supplied from the water supply valve 11 and the washing and dewatering tub 4 is supplied.
By switching and driving the stirring blades 6, the washing put on the clothes put in the washing and dewatering tub 4 is applied by applying mechanical force. In the rinsing process, the same operation is performed with the drainage of the drainage valve 9 interposed. In the dehydration step, the washing and dewatering tub 4 is driven to rotate at a high speed, and the clothes in the washing and dewatering tub 1 are centrifugally dehydrated.

[0006]

In such a conventional structure, when the laundry in the washing and dewatering tub 4 is unbalanced when the washing and dewatering tub 4 is rotationally driven, the water receiving tub 3 is largely laid sideways. It may vibrate and hit the outer frame 1 of the washing machine, or may be pushed up by vertical vibration, causing noise, product movement, falling down, and the like. In this regard, a safety switch (not shown) is provided on the side of the outer frame 1 of the washing machine, and is stopped when a large vibration of the water receiving tub 3 is detected by the safety switch, thereby ensuring safety.

This safety switch often operates at the time of primary resonance (mainly due to lateral vibration) of the water receiving tank 3 immediately after the start of dehydration. However, this method has a safety stop function for a lateral vibration larger than a predetermined value.
If the safety switch does not operate, the behavior of the vibration itself is unknown.

For this reason, at the time of the primary resonance, the safety switch does not operate even if the vibration is relatively large, and the vibration becomes larger at the time of the secondary resonance (mainly due to vertical vibration) at a slightly higher rotation speed. (Hereinafter referred to as abnormal vibration), there is a problem that this cannot be detected or stopped safely.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. When a large vibration is generated without the safety stop function of the safety switch being activated, the occurrence of abnormal vibration is detected by detecting this and stopping safely. The purpose is to ensure safety and correct the imbalance of the laundry in the washing and dewatering tub.

[0010]

According to the present invention, in order to achieve the above object, a stirring blade is rotatably disposed in a washing / dewatering tank rotatably disposed in a water receiving tank, and the washing and dewatering is performed. The water tank or the stirring blade is driven by a motor, the torque at the time of driving the motor is detected by the torque detecting means, the number of revolutions of the motor is detected by the rotating number detecting means, and the output signal of the torque detecting means is inputted to the control means. The operation of the motor and the like is controlled based on the detection result of the rotation speed detecting means. The control means, at the time of spin-up of spin-drying to drive the washing and spin-drying tub,
When the torque detected by the torque detecting means is equal to or more than the first value for the first predetermined time, the process shifts to the correction sequence.

Thus, when a large vibration occurs without the safety stop function of the safety switch being activated,
By detecting an increase in the load torque applied to the motor and shifting to the correction sequence, it is possible to safely stop the vehicle, prevent the occurrence of abnormal vibrations, secure safety, and also remove the laundry in the washing and spin-drying tub. Unbalance correction can be performed.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a washing and dewatering tub rotatably disposed in a water receiving tub,
A stirring blade rotatably disposed in the washing and dewatering tub, and a motor for driving the washing and dewatering tub or the stirring blade,
Water supply means for supplying water to the washing and dewatering tub, and torque detection means for detecting torque when driving the motor,
A rotation speed detection unit for detecting a rotation speed of the motor, and a control unit for inputting an output signal of the torque detection unit and controlling an operation of the motor or the like based on a detection result of the rotation speed detection unit, The control means shifts to a correction sequence when the torque detected by the torque detection means is equal to or more than a first value for a first predetermined time when the spinning of spin-drying for driving the washing and spin-drying tub is started. Even if large vibrations occur without the safety stop function provided by the safety switch, the safety switch can be stopped safely by detecting this and shifting to the correction sequence. It is possible to prevent the occurrence of the above-mentioned problem, to ensure the safety, and to correct the imbalance of the laundry in the washing and dewatering tub.

According to a second aspect of the present invention, in the first aspect of the present invention, the control means starts the vibration from the first rotation speed lower than the rotation speed corresponding to the vibration resonance point of the washing and dewatering tub. If the torque detected by the torque detecting means is equal to or more than the first value for the first predetermined time when the motor is started to the second rotation speed higher than the rotation speed corresponding to the resonance point, the process proceeds to the correction sequence. Since the load torque applied to the motor is maximized in the rotation range corresponding to the vibration resonance point where the vibration peaks theoretically, the torque at the rotation speed lower than the rotation speed corresponding to the vibration resonance point By detecting the abnormal vibration and predicting and stopping the abnormal vibration, it is possible to stop the occurrence of the abnormal vibration quickly and surely.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the control means adjusts the first rotation speed before starting from the first rotation speed to the second rotation speed. The second predetermined time is maintained, and the occurrence of abnormal vibration can be reduced by draining water in the laundry as much as possible before passing through the vibration resonance point.

[0015] The invention described in claim 4 is the above-mentioned claim 1-
In the invention described in Item 3, the control means sets the gradient of the increase in the number of revolutions at the time of rising from the first number of revolutions to the second number of revolutions higher than that of the other number of revolutions. By increasing the ascending gradient, torque is applied, and when vibration is large, detection is easy and detection accuracy can be improved. When the vibration is small, the rotation speed corresponding to the vibration resonance point is quickly passed, so that the vibration can be further reduced.

[0016] The invention according to claim 5 provides the above-mentioned claims 1 to
In the invention described in Item 4, the control means controls the degree of increase in the number of rotations of the motor so that the torque becomes equal to or less than a second value larger than the first value when the rotation of the washing and dewatering tub is started. Therefore, the load on the reduction gear transmission can be reduced and the durability can be improved. Further, since the current value can always be equal to or less than the predetermined value, the safety of the motor and the circuit can be improved.

The invention described in claim 6 is the above-mentioned claim 1.
In the invention described in 5, the control means includes: a dehydration after the stirring process in which the stirring blade is rotated by the motor; and a shower in which the water is supplied into the washing and dehydration tub by the water supply means while the washing and dehydration tub is rotated by the motor. The first predetermined time or the first value is changed between the dehydration after the rinsing step and the dehydration.
Even when the state of the laundry is different and the output tendency changes, the threshold value can be adjusted and detected accurately.

According to a seventh aspect of the present invention, in the first or second aspect of the invention, the correction sequence is such that water is supplied into a water receiving tub or a washing and dewatering tub, and the stirring blade is driven by a motor. By performing stirring, the cloth state is made uniform, and the water is drained after the balance is achieved, so that vibration during dehydration can be reduced.

[0019] The invention described in claim 8 is the above-mentioned claim 1,
The invention according to any one of 2, 7 and 8, further comprising a notifying means for performing a notifying operation, wherein the control means notifies the abnormality by the notifying means when the imbalance of the laundry is not improved even if the correction sequence is repeated a predetermined number of times. Was done,
It is possible to notify the user that the balance of the laundry is difficult to be corrected by the abnormality notification.

[0020] The ninth aspect of the present invention is the above-mentioned first to the first aspect.
5. The invention according to claim 5, further comprising an input setting means for setting a driving course and the like, wherein the control means is capable of changing the first predetermined time or the first value by a special operation of the input setting means. This makes it possible to make an appropriate determination according to the vibration performance of the main body of the washing machine. That is, the vibration performance of the main body of the washing machine is greatly affected by variations in parts constituting the washing machine and variations during assembly. However, the vibration performance is grasped in advance, and an abnormal state is determined according to the vibration performance. The predetermined vibration performance can be ensured by changing the reference value for this.

[0021]

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

(Embodiment 1) As shown in FIG.
Reference numeral 3 denotes a DC brushless motor.
Is connected to the speed reducer 14 via a belt,
At the time of washing, the speed is reduced, and transmitted to the stirring blade 6 at a reduction ratio of 6: 1, for example, and at the time of dehydration, transmitted to the washing and dewatering tub 4 at a ratio of 1: 1.

That is, assuming that the motor 13 rotates at 600 r / min, the number of rotations of the stirring blade 6 becomes 100 at the time of washing.
r / min, the rotation speed of the washing and dewatering tub 4 during dehydration is 600 r / m
In will be driven to rotate.

The water level detecting means 15 detects the water level by converting the water pressure at a connection (trip point) 16 at the lower part of the water receiving tank 3 into an electric frequency.

The position detecting means 17 is attached to the motor 13, outputs a signal corresponding to the rotation of the motor 13, and inputs the signal to the control device 18.

As shown in FIG. 1, the controller 18 controls the operation of the drain valve 9, water supply valve (water supply means) 11, motor 13, and the like, and sequentially controls a series of steps such as washing, rinsing, and dehydrating. It is composed of control means 19 and the like.

The control means 19 is constituted by a microcomputer, inputs information from an input setting means 20 for setting an operation course and the like, and displays the information on a display means 21 (notification means) based on the information, thereby displaying the user information. When the start of operation is set by the input setting means 20, data from the water level detection means 15 and the like are input, and the operations of the drain valve 9 and the water supply valve 11 are controlled through the load driving means 22 to perform washing. Driving.

At this time, the rotation control means 23 controls the rotation of the motor 13 by controlling the inverter circuit 25 via the drive circuit 24 based on the information from the position detection means 17.

The motor 13 is a DC brushless motor.
Although not shown, a stator having a three-phase winding 26;
The stator includes a first winding 26a, a second winding 26b, and a third winding 26c that form a three-phase winding 26. It is constructed by winding it around an iron core provided with a slot.

The inverter circuit 25 is constituted by a switching element comprising a parallel circuit of a power transistor (IGBT) and a reverse conducting diode. A series circuit of a first switching element 25a and a second switching element 25b, a series circuit of a third switching element 25c and a fourth switching element 25d, and a fifth switching element 2
It comprises a series circuit of 5e and a sixth switching element 25f, and the series circuit of the switching elements is connected in parallel.

Here, both ends of the series circuit of the switching elements are input terminals to which a DC power supply is connected, and output terminals are respectively connected to connection points of two switching elements forming the series circuit of the switching elements. The output terminal is
A U terminal, a V terminal, and a W terminal are connected to three terminals, a U terminal, a V terminal, and a W terminal of the three-phase winding 26, and are turned on and off by a combination of two switching elements that form a series circuit of the switching elements. Are set to three states of positive voltage, zero voltage, and release, respectively.

The switching elements are turned on / off by three position detecting means 17a, 17b, and 17 comprising a Hall IC.
It is controlled by the rotation control means 23 based on the information from c. The position detecting means 17a, 17b and 17c are arranged on the stator at intervals of 120 electrical degrees so as to face the permanent magnets of the rotor.

As shown in FIG. 3, during one rotation of the rotor, the three position detecting means 17a, 17b and 17c output pulses at timings as shown in FIG. The rotation control unit 23 detects the timing of the arrow shown in the figure (when the state of any one of the three position detection units changes), and detects the position detection units 17a, 17b, 1
By changing the ON / OFF state of the switching elements 25a to 25f based on the signal of FIG.
The terminals are set to three states of positive voltage, zero voltage, and release, and the first winding 26a, the second winding 26b, and the third winding 26 of the stator are provided.
A magnetic field is created by c to rotate the rotor.

The switching elements 25a, 25c,
25e is PWM-controlled, for example, by controlling the high / low duty ratio at a repetition frequency of 10 kHz,
The number of rotations of the rotor is controlled, and the rotation control means 23 includes three position detection means 17a, 17b, and 17c.
Each time the state of any of the signals changes, the cycle is detected, the rotation speed of the rotor is calculated from the cycle, and the switching elements 25a, 25c, 25
e is subjected to PWM control.

The resistor 27 detects the current, and the current detecting means 28 detects the inverter 25 based on the voltage across the resistor 27.
Of the motor 13 is detected based on the input current value. The motor 13 in the present embodiment is constituted by a DC brushless motor, and the current-torque characteristics are represented as shown in FIG.
Is proportional to the current flowing through

Therefore, by detecting the current flowing through the motor 13 by the current detecting means 28 and inputting it to the control means 19, an operation equivalent to inputting the torque generated by the motor 13 can be performed.

The commercial power supply 29 is connected to the diode bridge 3
0, a choke coil 31 and a smoothing capacitor 32 are connected to an inverter 25 via a DC power converter. The storage means 33 is composed of a non-volatile memory or the like, and stores various information required for the washing operation. The control means 19 reads the information stored in the storage means 33 when the power is turned on.

These are merely examples, and the configuration of the DC brushless motor 13 and the configuration of the inverter 25 are not limited to these.

The rotation control means 23, as shown in FIG.
A rotation speed detection unit 23a that receives a signal from the position detection unit 17 to detect the rotation speed of the motor 13, a rotation speed setting unit 23b that sets the rotation speed of the motor 13, a rotation speed setting unit 23b, and a rotation speed detection A rotation speed comparison unit 23c for comparing the rotation speed detected by the unit 23a, a rotation speed change amount detection unit 23d for detecting a change amount of the rotation speed, a rotation speed comparison unit 23c and a rotation speed change amount detection unit 23d. Of the switching elements 25a, 25c, 25e in order to bring the rotation speed of the motor 13 closer to the set rotation speed based on the input of
Operation amount determining means 23e for determining the operation amount of duty
And a duty ratio setting means 23f for setting the PWM duty of the switching elements 25a, 25c and 25e after being operated by the operation amount determining means 23e and outputting the PWM duty to the drive circuit 24.
And the PW of the switching elements 25a, 25c, 25e gradually increased according to the elapsed time from the start of the motor 13.
And a duty ratio storage means 23g for storing the M duty and outputting it to the drive circuit 24.

When the motor 13 is started, the rotation control means 23 changes the state of the signal of any of the three position detection means 17a, 17b, 17c up to three times, that is, until the motor 13 rotates by １ ／. Is the duty ratio storage means 2
By driving the drive circuit 24 with the output signal of 3g and thereafter with the output signal of the duty ratio setting means 23f, the PWM duty of the switching elements 25a, 25c, 25e is controlled.

FIG. 6 shows the state of rotation of the motor 13 during washing. The motor 13 is rotated at a speed of 600 r / min, that is, the stirring blade 6 is rotated at a speed of 100 r / min.
The normal rotation and reversal are repeated with the second on and the one second off.

The operation of the above configuration will be described. A washing machine usually performs washing in the order of a washing step, a rinsing step, and a final dewatering step. First, when the laundry and the detergent are put into the washing and dewatering tub 4 and the operation is started, the washing is performed by supplying water and driving the stirring blade 6 or the washing and dewatering tub 4. When the washing process is completed, drainage is performed, and the process shifts to a rinsing process. Here, repeat the middle dehydration and water supply several times, and rinse the laundry well. Thereafter, final dehydration is performed and the operation is terminated.

FIG. 7 shows the control of the number of rotations during the dehydration.
This will be described with reference to FIGS. The rotation speed of the washing and dewatering tub 4 is controlled as shown in FIG. First, at time t1, the rotation speed is raised to a first rotation speed N1 (for example, 165 r / min). When a large vibration occurs at the time of starting up to the first rotation speed N1, a safety switch (not shown) attached to the outer frame 1 operates to detect the vibration of the water receiving tank 3.

Next, the first rotation speed N1 is maintained for a period (second predetermined time) T1 (for example, 30 seconds in the draining process) until time t2. As a result, the laundry is squeezed moderately and lightly, and the vibration is reduced. Next, during a period T2 (cloth attaching process) until time t3, the second rotation speed N2 (for example, 30).
0 r / min), and the laundry is attached to the washing and dewatering tub. Then, during a period T3 (imbalance detection step) until time t4, the speed is reduced to the third rotation speed N3 to perform the unbalance detection. When the number of revolutions increases, abnormal vibration is detected. After that, in the period T4, the bubble activation failure is sequentially detected (confirmed).
While increasing the rotation speed to the steady rotation speed Nc, the dehydration is continued.

Here, the actual rotation speed is determined by the control means 19.
However, while the current of the motor 13 is detected by the current detecting means 28, the degree of increase in the number of revolutions of the motor 13, that is, the washing and dewatering tub 4 is controlled. That is, if the current of the motor 13 is sufficiently lower than the upper limit value i2 (the torque is the second value), the rotation speed is increased in accordance with the set rotation speed, but the motor current is likely to exceed i2. For example, the set rotation speed is reduced to control the degree of increase in the rotation speed of the motor 13 so as not to exceed i2.

This situation will be described with reference to FIGS. 8 and 9 show how the rotation speed of the washing and dewatering tub 4 increases and how the current of the motor 13 fluctuates during the period T4 in FIG. 7, and FIGS. 8 (a) and 8 (b) show the motors respectively. 13 shows the increase in the number of rotations of the washing and dewatering tub 4 and the fluctuation of the motor current when the load of the washing and dewatering tub 4 is light, and FIGS. And the degree of increase in the number of revolutions of the washing and dewatering tub 4 and the motor current when the load on the motor 13 is large, for example, when the degree of imbalance is large or when the resistance due to the generation of bubbles is large.

Here, a is the degree of increase in the set number of revolutions of the washing and dewatering tub 4, and c is the upper limit value i2 of the motor current.
When the load of the motor 13 is light, the motor current is sufficiently smaller than the upper limit value i2 as indicated by d, and the degree of increase in the rotation speed of the washing and dewatering tub 4 is substantially equal to the set rotation speed as indicated by b. Rises in the same manner as

When the load of the motor 13 is large, the current of the motor 13 is set to the upper limit value i2 during the period of Tc as shown by f.
Therefore, the degree of increase in the number of revolutions of the washing and dewatering tub 4 is suppressed during the period of Tc, as indicated by E.

As described above, by controlling the degree of increase in the number of revolutions of the washing and dewatering tub 4 so that the motor current does not exceed i2, the motor, the reduction gear, the circuit, etc. are protected, and the durability and safety are improved. Can be improved.

Next, abnormal vibration will be described. If the laundry in the washing and dewatering tub 4 becomes unbalanced when the washing and dewatering tub 4 is rotationally driven, the water receiving tub 3 vibrates largely sideways and hits the outer frame 1 of the washing machine, There is a possibility that noise, product movement, falling, etc. may occur due to pushing up due to vertical vibration. In this regard, a safety switch (not shown) such as a touch sensor is provided on the side of the outer frame 1 of the washing machine to detect a large vibration of the water receiving tank 3 to ensure safety.

This safety switch operates at the time of the first resonance (mainly due to lateral vibration) of the water receiving tank 3 immediately after the start of dehydration. However, this system has a safety stop function for a lateral vibration larger than a predetermined value. However, when the safety switch does not operate, the behavior of the vibration itself is unknown.
Therefore, at the time of the primary resonance, the safety switch does not operate even if the vibration is relatively large, and the vibration becomes larger at the time of the secondary resonance (mainly due to vertical vibration) at a slightly higher rotation speed. This cannot be detected or safely stopped. Such a state is called abnormal vibration.

The detection of the abnormal vibration is performed during the period T2 in FIG.
Then, when an abnormal vibration occurs at a rotation speed of N1 to N3, this is detected. Specifically, as shown in FIG.
When the time when the current value of the motor 13 exceeds the predetermined current value i2 is equal to or longer than the predetermined time ta, it is determined that the vibration is abnormal. FIG. 10A shows that dehydration starts at time t2 and the motor 1
At time tc when the time when the current value of No. 3 exceeds the predetermined current value i2 is equal to or longer than the predetermined time ta, dehydration is stopped assuming that the vibration is abnormal. FIG. 10B shows a case where ta> tb, and no abnormal vibration is determined.

Also, by bringing the vibration resonance point of the washing and dewatering tub 4 and the like during the detection period T2, it is possible to perform a safe stop by detecting before and after the rotation range where the vibration peaks theoretically. The occurrence of abnormal vibration can be efficiently and reliably stopped in a short time. In addition, by increasing the inclination b of the rotation speed increase in the period T2 compared to the inclination a or c of the rotation speed increase in other periods, more torque is applied, detection is easy, and detection accuracy is improved. Can also be improved.

In the period T1, the water in the laundry is drained as much as possible before passing through the vibration resonance point, thereby reducing the occurrence of abnormal vibration.

Next, a repair sequence when abnormal vibration occurs will be described. If abnormal vibration occurs, this state cannot be corrected even if the washing and dewatering tub 4 is restarted. Therefore, as a correction sequence at the time of dehydration rising failure, water is supplied into the water receiving tank 3 and the cloth is homogenized by stirring with the stirring blades 6, and the water is drained after the balance is achieved. Reduce vibration.

If dehydration cannot be performed even after the correction sequence is 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 displaying an abnormality on the display means 21.

As described above, according to the present invention, the control means 19
When the torque detected by the torque detecting means becomes equal to or more than the first value for the first predetermined time at the time of the spin-up of the spin-drying operation for driving the washing and spin-drying tub 4, the process shifts to the correction sequence. Even if large vibrations occur due to the safety stop function of the safety switch not operating, detecting this and stopping safely prevents abnormal vibrations from occurring and ensures safety. The imbalance of the laundry in the dewatering tub 4 can be corrected.

Further, the control means 19 controls the first rotation speed N1 lower than the rotation speed corresponding to the vibration resonance point of the washing and dewatering tub 4 to the second rotation speed N2 higher than the rotation speed corresponding to the vibration resonance point. When the torque rises at the first time, the process shifts to the correction sequence when the torque detected by the torque detecting means becomes equal to or more than the first value for the first predetermined time ta. By detecting before and after the rotation region and stopping safely, the occurrence of abnormal vibration can be stopped efficiently and reliably in a short time.

Further, the control means 19 controls the first rotation speed N1.
From the first rotation speed N1 to the second rotation speed N2 before
Is maintained for the second predetermined time T1, the water in the laundry is drained as much as possible before passing through the vibration resonance point, whereby occurrence of abnormal vibration can be reduced.

Further, the control means 19 controls the first rotation speed N1.
By setting the gradient of the increase in the number of revolutions at the time of starting from the second to the second number of revolutions N2 higher than in the other number of revolutions increase period,
Since a large torque is applied, detection can be performed easily and detection accuracy can be improved.

The control means 19 controls the degree of increase in the number of revolutions of the motor 13 when the rotation of the washing and dewatering tub 4 is started, so that the torque is equal to or less than a second value larger than the first value. Thus, the load on the reduction gear can be reduced and the durability can be improved. In addition, since the current value can always be equal to or less than a predetermined value,
Motor and circuit safety can also be improved.

In the correction sequence, the control means 19 supplies water into the water receiving tub 3 or the washing and spin-drying tub 4 and stirs by driving the stirring blades 6 with the motor 13 so as to equalize the cloth state. By draining the water after balancing, vibration during dehydration can be reduced.

If the imbalance of the laundry is not improved even after the correction sequence is repeated a predetermined number of times, the control means 19 notifies the abnormality by the display means 21.
It is possible to notify the user that the balance of the laundry is difficult to be corrected by the abnormality notification.

(Embodiment 2) The control means 19 shown in FIG.
Dehydration after the stirring process in which the stirring blade 6 is driven to rotate by the motor 13, and dehydration after the shower rinsing process in which the water supply valve 11 supplies water into the washing and dehydration tub 4 while the washing and dehydration tub 4 is driven to rotate by the motor 13. Thus, the first predetermined time or the first value is changed. Other configurations are the same as those in the first embodiment.

The operation of the above configuration will be described. FIG.
Indicates a washing sequence, in which washing is normally performed in the order of a washing step, a rinsing step, and a final dehydrating step. First, when the laundry and the detergent are put into the washing and dewatering tub 4 and the operation is started, the washing is performed by supplying water and driving the stirring blade 6 or the washing and dewatering tub 4. When the washing process is completed, drainage is performed, and the process shifts to a rinsing process. Here, repeat the intermediate dehydration and shower rinsing twice (water supply while rotating the washing and dewatering tub at a low speed), and finally perform a rinse to thoroughly rinse the laundry. Thereafter, final dehydration is performed and the operation is terminated.

When washing is performed according to this flow, the state of the laundry at the start of dehydration is as follows in the dehydration at * 1 in FIG.
As shown in FIG. 12A, the upper surface is substantially flat or mountain-like in the washing and dewatering tub 4. On the other hand, in the dehydration in * 2, since the dehydration was performed once at a steady rotation speed,
As shown in FIG. 2 (b), it is stuck in a ring shape inside the washing and dewatering tub 4 and has a deep valley shape.

For this reason, even in the case of the same amount of laundry, in the case of the state shown in FIG. 12B, the laundry is already attached to the outer periphery and the shower water is applied to the laundry. The unbalanced state at the time of raising (resonance speed range) is exaggerated, and the load torque for the motor 13 increases. Therefore, if the detection level is the same as that in the case of the state of FIG.

Therefore, by providing different detection thresholds for (a) and (b), the same level of detection of abnormal vibration can be maintained. Specifically, in the state of FIG. 12B, the first predetermined time ta for determining abnormal vibration is set longer than in the state of FIG. 12A. Alternatively, the level of the motor current 13 determined as abnormal vibration is compared with the state of (a) (b).
In the case of (1), a similar detection level of abnormal vibration can be maintained by increasing the value.

As described above, according to the present invention, the control means 19
Dewatering after the stirring process in which the stirring blade 6 is driven to rotate by the motor 13 and after the shower rinsing process in which the water is supplied into the washing and dewatering tub 4 by the water supply valve 11 while the washing and dewatering tub 4 is driven to rotate by the motor 13. The first predetermined time ta or the first time
Is changed, it is possible to accurately detect even when the condition of the laundry is different.

(Embodiment 3) As shown in FIG. 13, the input setting means 20 includes a water level switch 20a, a washing switch 20b, a rinsing switch 20c for individually setting a water level, a washing time, a number of rinses, and a dehydrating time. Switch 2
0d, a course setting switch 20 for setting a "standard course", a "light washing course", a "scrambled course", etc. having different washing times, rinsing times and dehydration times in the washing process.
e and start / input to start / pause the operation
It comprises a temporary stop switch 20f and a power switch 20g.

The display means 21 includes a water level display section 21a for displaying the water level, the washing time, the number of times of rinsing, and the dehydrating time individually set by the water level switch 20a, the washing switch 20b, the rinsing switch 20c, and the dehydrating switch 20d, and the washing time display. A section 21b, a rinse number display section 21c, a dehydration time display section 21d, a remaining time display section 21e for displaying a remaining time until the end of operation, and a course display section 21f for displaying a course set by the course setting switch 20e. Make up.

Therefore, the control means 19 controls the power switch 2
When 0g is pressed, it is determined whether the water level switch 20a and the wash switch 20b are pressed simultaneously, and if they are pressed simultaneously, a reference value for determining abnormal vibration (first predetermined time) Is corrected as shown in (Table 1). Other configurations are the same as those in the first embodiment.

[0073]

[Table 1]

To briefly explain the above description, when the reference value is not corrected, the abnormal vibration is determined based on whether the first predetermined time is equal to or longer than 2.0 seconds. The abnormal vibration is determined based on whether the predetermined time is equal to or longer than 1.0 second, and the abnormal vibration detection is corrected so that the occurrence frequency is increased.

In addition, the correction of the reference value is stored in the storage means 33, and in the subsequent operation, abnormal vibration is determined based on the corrected reference value.

Therefore, the first predetermined time can be changed by the special operation of the input setting means 20, so that an appropriate judgment can be made according to the vibration performance of the main body of the washing machine.
That is, the vibration performance of the main body of the washing machine is greatly affected by variations in parts constituting the washing machine and variations during assembly. However, the vibration performance is grasped in advance, and an abnormal state is determined according to the vibration performance. The predetermined vibration performance can be ensured by changing the reference value for this.

In the present embodiment, there are two examples of the setting method of correcting or not correcting the reference value. This is achieved by properly combining the various input switches and the various display units. If the correction can be made to a plurality of levels, there is a further effect.

[0078]

As described above, according to the first aspect of the present invention, the washing and dewatering tub is rotatably disposed in the water receiving tub, and the washing and dewatering tub is rotatably disposed in the washing and dewatering tub. A stirring blade provided, a motor for driving the washing and dewatering tub or the stirring blade, and a water supply unit for supplying water to the washing and dewatering tub,
Torque detection means for detecting torque when driving the motor, rotation number detection means for detecting the number of rotations of the motor, an output signal of the torque detection means being input, and based on the detection result of the rotation number detection means. And control means for controlling the operation of the motor and the like, wherein the control means controls the torque detected by the torque detection means during a spin-up of spin-drying for driving the washing and spin-drying tub for a first predetermined time. Only the first
When the value exceeds the value, the sequence shifts to the correction sequence, so even if a large vibration occurs without the safety stop function by the safety switch, this is detected and the process shifts to the correction sequence. By doing so, it is possible to safely stop and prevent the occurrence of abnormal vibration to ensure safety, and it is possible to correct the imbalance of the laundry in the washing and dewatering tub.

Further, according to the second aspect of the present invention, the control means changes the rotation speed corresponding to the vibration resonance point from the first rotation speed lower than the rotation speed corresponding to the vibration resonance point of the washing and dewatering tub. When the motor is started up to the second rotation speed higher than the predetermined number, when the torque detected by the torque detection means becomes equal to or more than the first value for the first predetermined time, the process shifts to the correction sequence. Since the load torque applied to the motor is maximum in the rotation range corresponding to the vibration resonance point where the vibration peaks, the abnormal vibration is predicted by detecting the torque at a rotation speed lower than the rotation speed corresponding to the vibration resonance point By stopping the operation, the occurrence of abnormal vibration can be stopped with certainty at an early stage.

According to the third aspect of the present invention, the control means maintains the first rotation speed for the second predetermined time before starting from the first rotation speed to the second rotation speed. Therefore, the occurrence of abnormal vibration can be reduced by draining the water in the laundry as much as possible before passing through the vibration resonance point.

According to the fourth aspect of the present invention, the control means sets the gradient of the increase in the number of revolutions at the time of rising from the first number of revolutions to the second number of revolutions more than in the other number of revolutions increasing periods. Since it is set high, torque is applied by increasing the gradient of the increase in the number of revolutions, and when vibration is large, detection is easy and detection accuracy can be improved. When the vibration is small, the rotation speed corresponding to the vibration resonance point is quickly passed, so that the vibration can be further reduced.

According to the fifth aspect of the present invention, the control means controls the rotation of the motor such that the torque becomes equal to or less than the second value which is larger than the first value when the rotation of the washing and dewatering tub is started. Since the degree of increase in the number is controlled, the load on the speed reducer can be reduced and the durability can be improved. Further, since the current value can always be equal to or less than the predetermined value, the safety of the motor and the circuit can be improved.

According to the invention described in claim 6, the control means controls the dehydration after the stirring process in which the stirring blades are driven to rotate by the motor, and the water supply means controls the washing and dewatering tub to rotate by the motor. Since the first predetermined time or the first value is changed by the dehydration after the shower rinsing step of supplying water into the washing and dewatering tub, even when the state of the laundry is different and the output tendency is changed, The threshold can be adjusted for accurate detection.

According to the seventh aspect of the present invention, in the correction sequence, water is supplied into the water receiving tub or the washing and dewatering tub, and the stirring blades are driven by the motor. By making the cloth state uniform and draining the water after the balance is achieved, vibration during dehydration can be reduced.

According to the eighth aspect of the present invention, there is provided a notifying means for performing a notifying operation, and the control means is configured to provide the notifying means when the imbalance of the laundry is not improved even if the correction sequence is repeated a predetermined number of times. Since the abnormality is notified by the means, the user can be notified by the abnormality notification that it is difficult to correct the balance of the laundry.

According to the ninth aspect of the present invention, there is provided input setting means for setting a driving course or the like, and the control means is configured to perform the first predetermined time or the first predetermined time by a special operation of the input setting means. Can be changed, it is possible to make an appropriate determination according to the vibration performance of the washing machine main body.
That is, the vibration performance of the main body of the washing machine is greatly affected by variations in parts constituting the washing machine and variations during assembly. However, the vibration performance is grasped in advance, and an abnormal state is determined according to the vibration performance. The predetermined vibration performance can be ensured by changing the reference value for this.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a washing machine according to a first embodiment of the present invention, which is partly blocked.

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 current-torque characteristic diagram of a motor of the washing machine.

FIG. 5 is a block diagram of a rotation control unit of the washing machine.

FIG. 6 is a timing chart at the time of washing of the washing machine.

FIG. 7 is a timing chart when the washing and dewatering tub of the washing machine is rotated and started.

FIG. 8 is a timing chart at the time of starting up the rotation of the washing and dewatering tub when the motor load of the washing machine is light;

FIG. 9 is a timing chart at the time of starting up the rotation of the washing and dewatering tub when the motor load of the washing machine is heavy.

FIG. 10A is a timing chart when abnormal vibration of the washing machine is detected. FIG. 10B is a timing chart when abnormal vibration of the washing machine is not detected.

FIG. 11 is a diagram illustrating a washing sequence of a washing machine according to a second embodiment of the present invention.

FIG. 12 (a) is a cross-sectional view of a main part showing a state of the laundry at the start of dehydration after the stirring process of the washing machine. (B) A state of the laundry at the start of dehydration after the shower rinsing process of the washing machine. Main part sectional view shown

FIG. 13 is a front view of an operation display unit of the washing machine according to the third embodiment of the present invention.

FIG. 14 is a sectional view of a conventional washing machine.

[Explanation of symbols]

 Reference Signs List 3 water receiving tank 4 washing and dewatering tank 6 stirring blade 11 water supply valve (water supply means) 13 motor 19 control means 23a rotation speed detection means 28 current detection means (torque detection means)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinji Matsuoka 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F-term (reference) 3B155 AA06 AA10 BA16 CA05 CA16 CB06 EA12 FA30 FC03 HB10 HC04 HC06 JA12 JB06 JB14 JC03 JC09 JC12 JC13 KA32 KA34 KA35 KB02 KB03 KB11 KB27 LA11 LA14 LB16 LB17 LB26 LB27 LB35 LC02 LC03 LC06 LC07 LC12 LC15 LC28 LC33 MA05 MA07

Claims (9)

[Claims] 1. A washing and dewatering tub rotatably disposed in a water receiving tub, a stirring blade rotatably disposed in the washing and dewatering tub, and driving the washing and dewatering tub or the stirring blade. And a water supply means for supplying water into the washing and dewatering tub,
Torque detection means for detecting torque when driving the motor, rotation number detection means for detecting the number of rotations of the motor, and an output signal of the torque detection means being input and based on the detection result of the rotation number detection means. And control means for controlling the operation of the motor and the like, wherein the control means detects the torque detected by the torque detecting means when the rotation of spin-drying for driving the washing and dewatering tub is started for a first predetermined time. Only the first
A washing machine that shifts to the correction sequence when the value becomes equal to or more than the value of. 2. The control device according to claim 1, wherein the control unit starts up from a first rotation speed lower than a rotation speed corresponding to the vibration resonance point of the washing and dewatering tub to a second rotation speed higher than the rotation speed corresponding to the vibration resonance point. 2. The washing machine according to claim 1, wherein when the torque detected by the torque detecting means is equal to or more than the first value for the first predetermined time, the process shifts to the correction sequence. 3. The washing machine according to claim 1, wherein the control means maintains the first rotation speed for a second predetermined time before starting from the first rotation speed to the second rotation speed. . 4. The control device according to claim 1, wherein the control unit sets the gradient of the increase in the rotation speed when rising from the first rotation speed to the second rotation speed higher than in the other rotation speed increase periods. 1
The washing machine according to the item. 5. The control device according to claim 1, wherein when the rotation of the washing and dewatering tub is started, the degree of increase in the number of rotations of the motor is controlled so that the torque is equal to or less than a second value that is larger than the first value. The washing machine according to any one of items 1 to 4. 6. A control means includes: a dehydration step after a stirring step in which a stirring blade is rotated by a motor; and a shower rinsing step in which water is supplied into the washing and dehydration tank by a water supply means while the washing and dehydration tank is driven by a motor. The washing machine according to any one of claims 1 to 5, wherein the first predetermined time or the first value is changed between subsequent dehydration. 7. The washing machine according to claim 1, wherein in the correction sequence, water is supplied into the water receiving tub or the washing and dewatering tub, and the stirring blade is driven by a motor. 8. The control device according to claim 1, further comprising: a notifying unit that performs a notifying operation, wherein the control unit notifies the abnormality by the notifying unit when the imbalance of the laundry is not improved even after the correction sequence is repeated a predetermined number of times. 8. The washing machine according to any one of items 2 and 7. 9. An apparatus according to claim 1, further comprising: input setting means for setting a driving course and the like, wherein the control means can change the first predetermined time or the first value by a special operation of the input setting means. The washing machine according to any one of claims 5 to 5.