REVOLUTION CONTROL DEVICE FOR LAUNDRY APPARATUS

摘要

PROBLEM TO BE SOLVED: To realize a revolution control device for laundry apparatus which realizes rotation control of a wide range from a low speed to a high speed by precisely detecting the number of revolutions of a motor in the area of the small number of revolutions so as to control the slow revolution of the motor by inexpensive constitution in the revolution controlling device for the laundry apparatus for controlling the number of the revolutions of the motor driving a pulsator or an inner tub.

SOLUTION: The motor 3 is connected in series with a power switching means 2 connected to an AC power source 1 to control the power switching means 2 by the output signal of a revolution detecting means 4 and to control the number of revolutions of the motor 3. The detecting means 4 detects the number of revolutions of the motor 3 on the basis of the voltage phase difference signal of an AC power source 1 and a capacitor 30 obtained when fully energizing the motor 3 after increasing the number of revolutions by repeating full energizing and turning off of the motor for a prescribed period in the case of starting rotation by a control means 5 and reaching first number of revolutions where the number of revolutions of the motor 3 can be detected from an induced voltage pulse width just after turning off the motor 3.

COPYRIGHT: (C)2004,JPO&NCIPI