JPH1085489A - Controller for washing machine and the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the rising of temp. due to the difference of power source frequencies by controlling an AC motor driving a self priming pump through a power switching means and controlling the conducting angle of voltage to apply to the AC motor according to a power source frequency detected by a power source frequency detecting means. SOLUTION: When a power source frequency is 60Hz, at the time of pump operation normally self-priming bath water, etc., the phase of a current is delayed by about 50 deg. to 70 deg. than the phase of voltage, and at the time of rotating by non-loading or restraining rotation the phase of a current is delayed by about 70 deg. to 90 deg. than the phase of voltage and the current is increased than that at the time of rotating by a proper load. Then when the power source frequency detection means 22 detects the power source of a 60Hz frequency, a control means 21 controls a power switching means 11 to make voltage applied to an AC motor 19 fully conductive. On the other hand, at the time of the power source of a 50Hz frequency, the control means 21 controls the conducting angle of voltage applied to the motor 19 to be 80 deg. to 100 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device such as a washing machine for sucking bath water or the like by a self-priming water pump.

[0002]

2. Description of the Related Art Conventionally, for example, a washing machine having a control device such as this type of washing machine has been constructed as shown in FIGS. Hereinafter, the configuration will be described.

[0003] As shown in FIG.
Driven by the DC commutator motor 2, the hose 4 and the like are connected to the self-priming water inlet 3, the bath water and the like are sucked and supplied to the washing and dewatering tub 5.

The control device 6 is constructed as shown in FIG. 10. The control means 7 is composed of a microcomputer, and sequentially controls a series of steps of washing, rinsing and dehydration, and outputs a signal from the control means 7. The motor 8, the drain valve 9,
The water supply valve 10, the DC commutator motor 2 and the like are controlled via the power switching means 11. The rectifying unit 12 converts an alternating current output from the power switching unit 11 into a direct current and applies the direct current to the direct current commutator motor 2. The power supply frequency detecting means 13 detects the frequency of the power supply. An input unit 15 composed of a key switch provided in the operation panel 14 and a display unit 16 composed of a light emitting diode or the like are provided. Reference numeral 17 denotes an AC power supply.

The operation of the above configuration will be described. When the setting of the self-priming water such as bath water is input by the input means 15 and when the self-priming process is performed by the fully automatic operation, the control means 7 controls the frequency of the AC power supply 17. Irrespective of the above, a signal is output to the power switching means 11 so that the output of the power switching means 11 is made fully conductive, the DC commutator motor 2 is operated via the rectification means 12, and the self-priming water pump 1
Drive.

[0006]

In such a conventional structure, since the self-priming water pump 1 is driven by the DC commutator motor 2, the noise is high, the brush wear is large, and the durability is poor. There were drawbacks. In addition, there is a problem that is practically inconvenient, for example, the electric noise is high, a noise prevention device is required, and the rectifier 12 is required.

When the self-priming water pump 1 is driven by an AC motor, the number of windings of the AC motor is changed or the shape of a runner (not shown) of the self-priming water pump 1 is changed depending on the frequency of the AC power supply 17. And must be distinguished. Therefore, the self-priming water pump and the washing machine incorporating the self-priming water pump have to be manufactured separately according to the frequency of the power source, and have a problem that the management of parts and processes must be performed separately.

Therefore, when a self-priming water pump using an AC motor can be used at different power supply frequencies, the AC motor has a different current depending on the frequency of the power supply.
When using at 50Hz, compared to using at 0Hz,
The current increases and the heat generated by the AC motor and the power switching means 11 increases. Therefore, there is a problem that a large heat radiating device or a cooling device is required.

In addition, when the self-priming pump 1 is driven without loading the bath water or the like without self-priming, or when the self-priming pump 1 is restrained by sucking in foreign substances, an abnormality occurs in the self-priming pump 1. There was a problem that it was not possible to detect that.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and reduces the noise of a motor for driving a self-priming water pump, improves durability, and makes the current of the motor to be driven substantially the same irrespective of the power supply frequency. The purpose is to suppress the temperature rise due to the difference in frequency, to reduce the size, and to improve the efficiency.

[0011]

According to the present invention, in order to achieve the above object, an AC motor for driving a self-priming water pump is controlled by a control means via a power switching means, and a power supply frequency is detected by a power supply frequency detecting means. I do. When the power supply frequency detected by the power supply frequency detection means is 50 Hz, the conduction angle of the voltage applied to the AC motor is controlled.

Thus, the noise of the motor driving the self-priming water pump can be reduced and the durability can be improved. A rise in temperature due to a difference in frequency can be suppressed, the size can be reduced, and the efficiency can be improved.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention comprises a self-priming water pump driven by an AC motor, power switching means for driving the AC motor, and control means for controlling the power switching means. Power supply frequency detection means for detecting a power supply frequency, wherein when the power supply frequency detected by the power supply frequency detection means is 50 Hz, the conduction angle of the voltage applied to the AC motor is controlled, When the AC motor that drives the self-priming water pump is operated with a power supply having a frequency of 50 Hz, the current is generally larger than when the AC motor is used with a power supply having a frequency of 60 Hz, and heat generated by the AC motor and the power switching means is increased. However, by controlling the conduction angle of the AC motor power supply, the current can be limited and the heat generated by each can be reduced. Can, as well as small, it is possible to improve the efficiency.

According to a second aspect of the present invention, in the first aspect of the present invention, when the self-priming water pump is driven, the voltage applied to the AC motor is fully conducted at the time of startup, and after a predetermined time, the AC motor is connected to the AC motor. The conduction angle of the applied voltage is controlled. When an AC motor uses a permanent magnet rotor, the starting torque is generally small. Then it may not start. Therefore, at the time of startup, all conduction,
By controlling the conduction angle after a predetermined time, the AC motor can be reliably started and the self-priming pump can be reliably operated.

According to a third aspect of the present invention, in the first or second aspect of the present invention, a temperature detecting means thermally coupled to the power switching means is provided, and the heat generation of the power switching means is detected. The conduction angle of the voltage applied to the AC motor is controlled. By driving the self-priming water pump, the conduction angle of the power supply of the AC motor is controlled so that the temperature of the power switching means does not exceed a certain temperature. And the current flowing therethrough is limited, whereby an increase in the temperature of the power switching means can be suppressed. This eliminates the need for a large heat radiating device or cooling device, radiates heat with a small heat radiating plate, and can reduce the size and cost of the control device.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the abnormality of the self-priming water pump is predicted by detecting the heat generation of the power switching means by the temperature detecting means. The self-priming water pump is stopped without self-priming, such as when the self-priming pump is driven without load or when the self-priming pump is restrained by sucking in foreign substances. When an abnormality occurs in the water suction pump, the drive is stopped to prevent damage to the self-water suction pump or the power switching means or abnormal heat generation.

[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 denoted by the same reference numerals, and description thereof is omitted.

(Embodiment 1) As shown in FIG. 2, a self-priming water pump 18 is driven by an AC motor 19,
A hose 4 and the like are connected thereto, and bath water and the like are sucked and supplied to the washing and dewatering tub 5. The AC motor 19 is a motor using a permanent magnet rotor and has a power supply frequency of 50 Hz and 60 H
It can be shared with z.

The control device 20 is constructed as shown in FIG. 1. The control means 21 is composed of a microcomputer and sequentially controls a series of steps of washing, rinsing and dehydration. Thus, the motor 8, the drain valve 9, the water supply valve 10, the AC motor 19, and the like are controlled via the power switching means 11. Power frequency detection means 2
2 detects the frequency of the AC power supply 17 and inputs its output to the control means 21. The control means 21 applies a voltage applied to the AC motor 19 when the power supply frequency detected by the power supply frequency detection means 22 is 50 Hz. Is controlled.

The operation of the above configuration will be described. When the power supply frequency is 60 Hz, as shown in FIG. About 50-70 degrees behind the phase of
There is a characteristic that the phase of the current is delayed by about 70 to 90 degrees from the phase of the voltage and becomes larger than when the current is rotated with an appropriate load. In addition, when used with a power supply having a frequency of 50 Hz, the phase lag of the current is the same as in the case of a frequency of 60 Hz, and the current increases.

When using a power supply having a frequency of 60 Hz,
The power supply frequency is detected by the power supply frequency detection means 22 and the control means 21 inputs the fact that the power supply frequency is 60 Hz. As shown in FIG. Power switching means 1
1 is supplied with a gate signal to drive the self-priming water pump 18.

When using a power supply having a frequency of 50 Hz, as shown in FIG. 5, the control means 21 controls the power switching so that the conduction angle of the voltage applied to the AC motor 19 becomes 80 to 100 degrees. A gate signal is supplied to the means 11 for control.

At this time, immediately after the self-priming water pump 18 is operated by driving the AC motor 19, the air in the hose 4 is sucked. Since the current is delayed by about 70 to 90 degrees, the current cannot be limited and almost full conduction occurs, and the self-priming water pump 18 can be started. When all the air in the hose 4 is sucked in and the bath water or the like is self-primed, the load becomes an appropriate load, and as shown in FIG. 6, the conduction angle is limited, the current can be reduced, and the AC motor 19 and the power switching means 11 Fever can be reduced.

The self-priming water pump 18 has an AC motor 19
, The noise can be reduced, the durability can be improved, the electric noise can be reduced, the rectifying means can be omitted, and the AC motor 19 can share 50 Hz and 60 Hz. In addition, there is no need to distinguish between the self-priming water pump 18 and a washing machine incorporating the self-priming water pump 18 according to the power supply frequency.

(Embodiment 2) As shown in FIG. 7, when the self-priming water pump 18 is driven, the timer means 23 receives a command from the control means 24 for a predetermined time (for example, 5 minutes).
After a second), an instruction is given to the control means 24, and the control means 24 fully conducts the voltage applied to the AC motor 19 at startup, and controls the conduction angle of the voltage applied to the AC motor 19 after a predetermined time. Like that. Other configurations are the same as those in the first embodiment.

The operation of the above configuration will be described. When using a power supply having a frequency of 50 Hz, the self-priming pump 18 is temporarily stopped by the input of the input means 15 during the self-priming process, and then is again stopped. When the self-priming water pump 18 is driven and the self-priming water pump 18 is driven, for example, when the self-priming water pump 18 contains bath water,
4 supplies a gate signal to the power switching means 11 so that the voltage applied to the AC motor 19 is fully conducted. After a predetermined time, the control means 24 sets the conduction angle of the voltage applied to the AC motor 19 to 80 to 100. Thus, a gate signal is given to the power switching means 11 and controlled so that the AC motor 19 can be reliably started and the self-priming water pump can be reliably operated.

(Embodiment 3) As shown in FIG. 8, the temperature detecting means 25 is composed of a thermistor or the like, and is thermally coupled to the power switching means 11.
1 is detected, and its output is input to the control means 26. When the temperature of power switching means 11 detected by temperature detecting means 25 reaches a predetermined temperature (for example, 85 ° C.), control means 26 controls the conduction angle of the voltage applied to AC motor 19 to, for example, 40 to 80 degrees. I have to. Other configurations are the same as those in the first embodiment.

The operation of the above configuration will be described. When the temperature of the power switching means 11 detected by the temperature detecting means 25 reaches a predetermined temperature while the self-priming water pump 18 is being driven, the control means 26 applies the voltage to the AC motor 19. A gate signal is applied to the power switching means 11 to control so that the conduction angle of the voltage becomes 40 to 80 degrees, thereby limiting the current. As a result, an increase in the temperature of the power switching means 11 can be suppressed. Since the temperature of the power switching means 11 can be controlled, a large heat radiating device or cooling device is not required, heat can be radiated by a small heat radiating plate, and the control device can be reduced in size and cost.

(Embodiment 4) The control means 26 in FIG.
In the case where the temperature of the power switching means 11 detected by the temperature detecting means 25 continues to rise, it is determined that the AC motor 19 that drives the self-priming water pump 18 is abnormal, and the driving of the AC motor 19 is stopped. . Other configurations are the same as those in the first embodiment.

When the operation is described in the above configuration, when the AC motor 19 is rotated with no load or when the rotation is restricted, the phase of the current is about 70 to 90 times larger than that of the voltage.
When the self-priming water pump 18 is restrained by sucking in foreign substances or the like, the conduction angle of the power source of the self-priming water pump 18 is reduced by 40 to 80 degrees. However, the current cannot be limited, and the temperature of the power switching means 26 further increases.

The operation will be described with reference to FIG. 9. In steps 31 and 32, the self-priming water pump 18 is driven in full conduction for a predetermined time. In steps 33 and 34, the power supply frequency is 50H
If z, the conduction angle is set to 90 degrees, and the heat generation of the power switching means 11 and the AC motor 19 is reduced. In steps 35 and 36, when the temperature of the power switching means 11 reaches a predetermined temperature, the conduction angle is set to 45 degrees to further reduce heat generation.

In step 37, if the set amount of water is self-absorbed, the process proceeds to the next step. If the self-water absorption is not completed, in step 38, the temperature of the power switching means 11 is further increased. Determines that there is an abnormality in the self-priming pump 18, stops driving in step 39, and notifies the abnormality by the display unit 16. At step 40, it is determined whether or not the abnormality has been resolved, and when it has returned to normal, self-priming is performed from step 31.

In the above embodiment, the self-priming water pump 18
Has been described in connection with supplying the bath water to the washing machine, but the water supply in the water-using equipment other than the washing machine can be similarly realized.

[0034]

As described above, according to the first aspect of the present invention, a self-priming water pump driven by an AC motor is provided.
Power switching means for driving the AC motor,
Control means for controlling the power switching means; and power supply frequency detection means for detecting a power supply frequency, wherein the power supply frequency detected by the power supply frequency detection means is 50H.
When z, since the conduction angle of the voltage applied to the AC motor is controlled, when the AC motor driving the self-priming water pump is operated with a power supply having a frequency of 50 Hz,
In general, the current becomes larger and the heat generated by the AC motor and the power switching means increases as compared with the case of using a power supply having a frequency of 60 Hz. However, the current is limited by controlling the conduction angle of the power supply of the AC motor. The heat generation can be reduced, the size can be reduced, and the efficiency can be improved.

According to the second aspect of the present invention, when the self-priming water pump is driven, the voltage applied to the AC motor is fully conducted at the time of startup, and the conduction angle of the voltage applied to the AC motor after a predetermined time has elapsed. Therefore, the AC motor generally uses a permanent magnet rotor to control
Since the starting torque is small, if the conduction angle of the power supply of the AC motor is limited at the time of starting, there is a case where the starting is not performed.
The AC motor can be reliably started, and the self-priming water pump can be reliably operated.

According to the third aspect of the present invention, there is provided a temperature detecting means thermally coupled to the power switching means, and by detecting heat generation of the power switching means, conduction of a voltage applied to the AC motor is achieved. By controlling the angle, controlling the conduction angle of the AC motor power supply and limiting the flowing current by driving the self-priming water pump so that the temperature of the power switching means does not exceed a certain temperature. As a result, it is possible to suppress an increase in the temperature of the power switching means, thereby eliminating the need for a large heat radiating device or a cooling device, radiating heat with a small heat radiating plate, and reducing the size and cost of the control device. Can be.

According to the fourth aspect of the present invention, the abnormality of the self-priming water pump is predicted by detecting the heat generation of the power switching means by the temperature detecting means, and the driving of the self-priming water pump is stopped. When the self-priming pump is abnormal, such as when the self-priming pump is driven with no load without self-priming bath water or when the self-priming pump is restrained by sucking in foreign substances In addition, the drive is stopped to prevent the self-priming water pump or the power switching means from being damaged or abnormally heated.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram of a washing machine having a control device such as a washing machine according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a washing machine having a control device such as the washing machine.

FIG. 3 is a main part voltage and current waveform diagram when the power supply frequency of the washing machine control device is 60 Hz.

FIG. 4 is a main part voltage and current waveform diagram when the power supply frequency of the washing machine control device is 60 Hz.

FIG. 5 is a main part voltage and current waveform chart when the power supply frequency of the washing machine control device is 50 Hz.

FIG. 6 is a main part voltage and current waveform diagram when the power supply frequency of the washing machine control device is 50 Hz.

FIG. 7 is a block circuit diagram of a washing machine having a control device such as a washing machine according to a second embodiment of the present invention.

FIG. 8 is a block circuit diagram of a washing machine having a control device such as a washing machine according to a third embodiment of the present invention.

FIG. 9 is an operation flowchart of a main part of a control device of a washing machine or the like according to a fourth embodiment of the present invention.

FIG. 10 is a block circuit diagram of a conventional washing machine having a control device such as a washing machine.

FIG. 11 is a sectional view of a washing machine provided with a control device such as the washing machine.

[Explanation of symbols]

 11 Power switching means 18 Self-priming water pump 19 AC motor 21 Control means 22 Power supply frequency detecting means

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Ken Nakamura 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] A self-priming water pump driven by an AC motor;
Power switching means for driving the AC motor,
Control means for controlling the power switching means; and power supply frequency detection means for detecting a power supply frequency, wherein the power supply frequency detected by the power supply frequency detection means is 50H.
When z, a control device such as a washing machine for controlling a conduction angle of a voltage applied to the AC motor. 2. The self-priming pump according to claim 1, wherein when the self-priming water pump is driven, the voltage applied to the AC motor is fully conducted at the time of startup, and the conduction angle of the voltage applied to the AC motor is controlled after a predetermined time. Control devices such as washing machines. 3. The method according to claim 1, further comprising a temperature detecting means thermally coupled to the power switching means, wherein a conduction angle of a voltage applied to the AC motor is controlled by detecting heat generated by the power switching means. 2. A control device of the washing machine or the like according to 2. 4. An abnormality of the self-priming water pump is predicted by detecting heat generation of the power switching means by the temperature detecting means,
4. The driving of the self-priming water pump is stopped.
A control device such as the washing machine described in the above.