KR19980039510A - Load control method and load control device of washing machine motor - Google Patents

Abstract

Disclosed are a load control method and a load control apparatus of a washing machine motor for sensing a temperature of a motor in a washing machine to determine a load state of the motor and to control the load to be reduced when an overload is applied to the motor. When the washing machine operates, it senses the temperature in the washing motor, and determines whether the detected temperature is higher than or equal to the set temperature. If it is determined that the temperature in the washing motor is abnormal, the water level in the washing tank is detected. If it is determined that the level of the washing tank is impossible to determine the detected water level, the washing stop time is extended, and if it is determined that the level of the washing tank can be increased, the level of the washing tank is increased. By preventing the overload of the washing motor when the washing machine is driven, the durability of the washing machine is improved, and the reliability of the washing machine is improved to the user.

Description

Load control method and load control device for washing machine motor

The present invention relates to a load control method and a load control device for a washing machine motor, and more particularly, to determine a load state of a motor by sensing a temperature of a motor in a washing machine, and to control the load to be reduced when an overload is applied to the motor. It relates to a load control method and a load control device of the motor.

Generally, washing machines are classified into pulsator type washing machines, agitator type washing machines, and drum type washing machines according to the washing method. The dual pulsator type washing machine has a pulsator rotatably mounted at the bottom of the washing tank to generate water flow in the washing tank. In the pulsator type washing machine, the pulsator is driven by a motor to generate a swirling water flow in the washing tank, and the laundry is washed as the swirling water stream impacts the laundry.

The pulsator type washing machine is widely used for home use, and is divided into a dual type washing machine in which a washing tank and a dehydrating tank are separately installed in the washing machine, and a solar type washing machine in which the washing tank performs the role of the dehydrating tank.

1 is a cross-sectional view showing the configuration of a general pulsator type washing machine.

In the general pulsator type washing machine 100, as shown in the drawing, a pulsator 104 is rotatably mounted at a lower portion of the washing tank 102 for storing laundry to generate water flow in the washing tank 102. The dehydration tank 106 in which a plurality of water holes 108 are formed on the sidewall is installed separately from the washing tank 102.

A washing motor 110 generating a driving force for rotating the washing tub 102 is mounted at the bottom of the washing machine 100. The first pulley 112 is connected to the washing motor 110. The pulsator drive shaft 116 extends downward in the pulsator 104. A second pulley 114 for rotating the pulsator drive shaft 116 is connected to the pulsator drive shaft 116. The first pulley 112 and the second pulley 116 are connected to each other by a belt 118 so that the driving force of the washing motor 110 can be transmitted to the pulsator 104.

In addition, the lower side of the washing machine 100 is connected to the washing tank 102 is equipped with a drain valve 120 for discharging the washing water in the washing tank (102). The drain valve 120 is connected to the drain hole 122 to discharge the wash water to the outside.

In the case of using a general pulsator washing machine configured as described above, when the user puts laundry into the washing tank 102 and operates the washing machine 100, the washing motor 110 rotates. The rotational force of the washing motor 110 is transmitted to the pulsator drive shaft 116 through the first pulley 112 and the second pulley 114, and thus the pulsator coupled with the pulsator drive shaft 116. The eater 104 rotates to generate water flow in the washing tub 102. The water flow generated by the pulsator 104 impacts the laundry contained in the washing tub 102, and the laundry is washed. The time for washing the laundry is adjustable by a timer (not shown).

However, in the conventional washing machine, the countermeasure against the state in which the washing motor 110 does not rotate smoothly due to an overload, that is, an external condition during washing, is insignificant. In particular, when there is a lot of laundry compared to the wash water supplied to the rotation of the washing tub 102 is not smooth. When the rotation of the washing tub 102 is not smooth, an overload is applied to the washing motor 110. When an overload is applied to the washing motor 110, the washing force of the washing machine is lowered and of course, a failure of the washing motor 110 occurs. Therefore, the durability of the washing machine may be lowered, which may cause a problem that the reliability of the washing machine is lost.

The first object of the present invention was devised to solve the above problems is to detect the load state of the washing motor by detecting the temperature of the coil mounted inside the washing motor to perform the washing operation by rotating in the washing machine, washing motor When the overload is applied to reduce the load applied to the motor to provide a load control method of the washing machine motor that can improve the durability improvement of the washing machine.

In addition, a second object of the present invention is to provide an apparatus suitable for performing the above load control method.

1 is a cross-sectional view showing the configuration of a general pulsator type washing machine.

Figure 2 is a block diagram showing a load control device of a washing machine motor according to an embodiment of the present invention.

3 is a flowchart illustrating a load control method of a washing machine motor according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawing

200: water level sensor 210: key input unit

220: microcomputer 230: washing motor unit

240: temperature sensing unit 250: display unit

260: water supply

In order to achieve the first object of the present invention, the present invention comprises the steps of: sensing the temperature in the washing motor when the washing machine operates;

Determining whether the washing motor temperature is equal to or higher than a set temperature;

Detecting a water level in the washing tank when it is determined that the washing motor temperature is abnormal;

Determining whether the level of the washing tank can be increased in the step, and if it is determined that the level of the washing tank is impossible, extending the washing stop time; And,

In the above step, if it is determined that the water level of the washing tank is possible to provide a load control method of the washing machine motor comprising the step of raising the water level of the washing tank.

In addition, the present invention in order to achieve the second object, the water level sensor unit is installed in the washing tank to sense the level of the wash water and output a signal accordingly;

Washing motor unit for converting the rotational motion to receive the power to perform the washing and dehydration operation;

A temperature sensing unit mounted inside the washing motor unit to sense a temperature of the washing motor and output a signal according to the washing motor;

The load state of the washing motor is determined by receiving the signal output from the temperature sensing unit. When the washing motor is overloaded, the water level of the washing tank is determined by the input signal of the water level sensor unit. A microcomputer that extends the stop time and performs a control to raise the level of the washing tank if the level of the washing tank is increased; And,

It provides a load control device of the washing machine consisting of a display unit for receiving the output signal of the microcomputer to display the operating state of the washing machine.

The present invention prevents the overload of the washing motor when the washing machine is driven, thereby improving the durability of the washing machine and improving the reliability of the washing machine.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram showing a load control apparatus of a washing machine motor according to an embodiment of the present invention, Figure 3 is a flow chart for showing a load control method of a washing machine motor according to an embodiment of the present invention.

As the washing machine which can be used in the present invention, for example, the general pulsator type washing machine of FIG. 1 can be used. Therefore, detailed description thereof will be omitted.

Referring to the control device of the washing machine motor, as shown in Figure 2, the water level sensor unit 200 is connected to the input terminal of the microcomputer 220. The water level sensor unit 200 is installed at a predetermined position in the washing machine to detect the water level of the wash water supplied and apply a signal corresponding thereto to the microcomputer 220. The key input unit 210 is connected to an input terminal of the microcomputer 220. The key input unit 210 inputs a signal corresponding thereto to the microcomputer 220 by a user's key manipulation. The output terminal of the microcomputer 220 is connected to the washing motor unit 230 for converting the electric rotation into mechanical rotational motion to perform the washing and dehydration operation of the washing machine. The temperature sensing unit 240 is mounted on the washing motor 230 of the washing machine. That is, the washing motor mounted on the washing motor unit 230 includes a rotating rotor and a stator. The temperature sensing unit 240 is mounted at a position suitable for sensing the temperature of the coil constituting the stator of the washing motor. That is, when an overload is applied to the washing motor, the temperature of the coil constituting the stator increases abnormally. Therefore, the temperature detector 240 detects that the temperature of the coil is abnormally raised and applies a predetermined signal to the microcomputer 220.

In addition, the display unit 250 for visually displaying the operating state of the washing machine to the user is connected to the output terminal of the microcomputer 220. In the washing machine according to the present invention, the display unit 250 detects an overload state of the washing motor, and displays it to the user when the overload prevention operation is performed. In the washing machine according to the present invention, the water supply unit 260 is connected to the output terminal of the microcomputer 220. The water supply unit 260 adjusts the level of the washing tank in the washing machine under the control of the microcomputer 260.

In the washing machine according to the present invention configured as described above, when the washing machine starts to operate, the microcomputer 220 receives the signal output from the temperature sensing unit 240 to sense the temperature of the coil and transmits the corresponding signal to the microcomputer 220. Is authorized. The microcomputer 220 detects the load state of the washing motor unit 230 by receiving the signal of the temperature sensing unit 240, and if the temperature of the coil is abnormally increased to determine that the washing motor is overloaded, the water level sensor unit ( The water level in the washing tank is sensed by the signal of 200). If it is determined that the water level in the washing tank can afford additional water, the microcomputer 220 operates the water supply unit 260 to increase the water level in the washing tank to reduce the load of the washing motor. However, if it is determined that the water level in the washing tank cannot afford additional water supply, the microcomputer 220 prevents overload of the washing motor by prolonging the washing stop time to prevent overheating of the washing motor.

Detailed operation of the load control method of the washing machine motor according to the present invention as described above will be described with reference to FIG.

As shown in FIG. 3, when the washing machine operates, the microcomputer 220 senses the temperature of the stator coil mounted to the washing motor by the output signal of the temperature sensing unit 240 mounted in the washing motor unit 230 (S1). ).

The microcomputer 220 determines whether the temperature of the stator coil input from the temperature sensing unit 240 is greater than or equal to the set temperature (S2). That is, when an overload is applied to the washing motor, the coil mounted on the washing motor is heated, and the microcomputer 220 determines that an overload is applied to the washing motor when a signal higher than a set value is input from the temperature sensor 240.

As a result of the determination of the microcomputer 220 in the second step, if the temperature of the coil wound around the stator in the washing motor is abnormally increased and the washing motor is determined to be overloaded, the water level sensor 200 receives a signal to detect the water level in the washing tank. (S3). After the third step, the microcomputer 220 determines whether the water level in the washing tank can afford additional water supply, that is, increase the water level according to the signal of the water level sensor 200 (S4). If the microcomputer 220 determines that the water level of the washing tank cannot afford additional water after the above step, the washing stop time, that is, the time that the washing motor is stopped during the period of moving to each step during washing of the washing machine becomes longer. By controlling to prevent the overload is applied to the washing motor (S5).

After the fourth step, when the microcomputer 220 determines that the water level of the washing tank can be additionally supplied with water, the microcomputer 220 outputs a control signal to the water supply unit 260 to raise the water level in the washing tank (S6). ). That is, when the laundry is excessively administered in the washing tank, the washing motor is frequently overloaded, and thus the microcomputer 220 additionally supplies the washing water to reduce the load of the washing motor. After the sixth step, the microcomputer 220 determines whether the water supply is finished (S7). When the water supply is finished, that is, when the water supply is completed up to the level set by the microcomputer 220, the microcomputer 220 performs the washing operation again. At this time, the display 250 receives the output signal of the microcomputer 220 to indicate that the motor overload protection operation. Therefore, the washing machine stops during washing and performs a water supply operation to prevent a situation in which the user suspects a failure of the washing machine.

As can be seen from the above description, the present invention detects the temperature of the stator coil mounted to the washing motor when the washing machine is driven, and if abnormal temperature is detected, re-water the washing water or maintain the washing stop time for a long time. Prevent overload operation of the washing motor. Therefore, it improves the durability of the washing machine and enhances the reliability of the washing machine to the user.

Although the present invention has been described in detail with reference to the accompanying drawings, the present invention is not limited thereto and may be improved or modified within the ordinary knowledge of a person skilled in the art.

Claims (4)

(I) detecting a temperature in the washing motor when the washing machine operates; (II) determining whether the temperature in the washing motor is equal to or higher than a set temperature; (III) detecting the water level in the washing tank if it is determined that the temperature in the washing motor is abnormal; (IV) determining whether the level of the washing tank can be increased in step III, and if it is determined that the level of the washing tank is impossible, extending the washing stop time; And, (V) the load control method of the washing machine motor comprising the step of raising the water level of the washing tank in step IV, if it is determined that the water level of the washing tank is possible. The method of claim 1, wherein the step (I) detects the temperature of the coil wound on the stator in the washing motor. A water level sensor unit 200 installed in the washing tank to detect the level of the washing water and output a signal according to the level; Washing motor unit 230 for receiving the power to convert the rotation to perform the washing and dehydration operation; A temperature sensing unit 240 mounted inside the washing motor unit 230 to sense a temperature of the washing motor and output a signal according to the washing motor; The load state of the washing motor is determined by receiving the signal output from the temperature sensing unit 240, and when the washing motor is overloaded, the level of the washing tank is determined by the input signal of the water level sensor 200, and the washing tank If it is impossible to increase the level of washing stop time is extended, and if possible to increase the level of the washing tank, the microcomputer 220 performs a control to increase the level of the washing tank; And, Load control device of the washing machine motor consisting of a display unit 250 for receiving the output signal of the microcomputer 220 to display the operating state of the washing machine. The load control device of the washing machine motor of claim 3, wherein the temperature sensor 240 detects a temperature of a stator coil of the washing motor, which is mounted in the washing motor 230.