KR950006081A - Induction motor driving device of washing machine and control method of induction motor during dehydration - Google Patents

Abstract

The present invention is to control the rotational speed of the induction motor more precisely, and to reduce the number of times of driving and stopping the induction motor during the dehydration of the laundry to reduce the generation of noise. In order to maintain the set speed, it is necessary to repeat driving and stopping of the induction motor, and a lot of noises are generated by frequent driving and stopping of the induction motor, thereby causing discomfort to the user.

The present invention configures the induction motor driving device to drive the induction motor to drive and stop the induction motor as well as to drive the induction motor in a state in which power is applied to the induction motor through the starting capacitor to transmit only a small driving force. The rotational set speed and time of the induction motor for each step and the final dehydration during intermittent dehydration are set in advance and stored as a look-up table. The induction motor driving device is driven according to the look-up table to drive the induction motor during the dehydration operation. If the induction motor rotates at the set speed, the operation of driving the induction motor with a small amount of maneuvering power is repeatedly performed for a set time to maintain the driving state in which the driving force is continuously supplied without stopping the induction motor. When dehydration, noise can be reduced by repeatedly driving and stopping the induction motor.

Description

Induction motor driving device of washing machine and control method of induction motor during dehydration

Since this is an open matter, no full text was included.

5 is a detailed view showing the drive device of the present invention,

6 is a signal flow diagram showing a control method of the present invention,

7 is a table showing an example of a lookup table of a target rotational speed and a holding time set in advance according to the water level of a standard course in the control method of the present invention.

Claims (3)

The condenser C11 for starting the induction motor 12 and the forward and reverse driving signals CW11 and CCW11 are respectively conducted to apply the power supply AC to the coils L11 and L12 of the induction motor 12. The coil AC 120 of the induction motor 12 is connected to the triac TRI11 TRI12 and the forward and reverse driving signals CW12 and CCW12, respectively, so that the power source AC is supplied through the starting capacitor C11. Induction motor driving device of the washing machine, characterized in that consisting of a triac (TRI13) (TRI14) to be applied to (L11). The first step of draining the wash water to the air level, and when the water level in the first step to drive the induction motor 12 with the maximum driving force and the induction motor when the rotational speed is higher than the set speed in each step A second process of intermittently dehydrating repeatedly driving at the maximum driving force when the driving force is reduced to a driving speed lower than the set lower limit speed; and setting the next intermittent dehydration step when the set time elapses in the second process. In the case where the third process of repeating the second process at the speed and the step of intermittent dehydration in the third process are performed, the induction motor 12 is driven with the maximum driving force, and the rotation speed becomes less than the set speed. When dehydration is set to drive by reducing the driving force and driving at the maximum driving force when it falls below the lower limit speed and stopping the driving when it becomes above the upper limit speed. Repeat the process 4 and, at the time of induction motor control method of the washing machine dehydration as claimed in claim 5, the process of stopping the induction passage of drainage time the motor is set in the fourth step of while. The method of claim 2, wherein the reduction of the driving force of the induction motor 12 is characterized in that the power source AC is applied to one coil (L11 or L12) of the two coils (L11, L12) of the induction motor 12. Induction motor control method when washing machine is dewatered. ※ Reference: It is disclosed based on the contents of the initial application.