Method and circuit for controlling vibrations in washing machine

Details Method and circuit for controlling vibrations in washing machine Method and circuit for controlling vibrations in washing machine

1996-12-17

1998-02-24

Vanatta, Amy B.

Bleaching and dyeing; fluid treatment and chemical modification

Fluid treatment

Manipulation of liquid

68 1206, D06F 3302

Patent

active

057200661

ABSTRACT:
A method for controlling vibrations occurring during a spin cycle of a washing machine includes the steps of: setting vibration patterns according to the vibration frequencies and period of the washing machine using piezoelectric effect; setting an optimal speed pattern of a motor of the washing machine with respect to each vibration pattern; detecting the vibration frequencies and period of the washing machine using the piezoelectric effect; obtaining a vibration pattern according to the detected vibration frequencies and period; and controlling the motor with the optimal speed pattern with respect to the obtained vibration pattern. Also, a vibration controlling circuit includes: a memory for storing vibration patterns and an optimal speed pattern with respect to each of the vibration pattern; a vibration sensor for generating a rectangular-wave signal using a piezoelectric effect; a first counter for counting the pulse occurrence frequencies of the rectangular-wave signal; a second counter for counting the pulse occurrence period of the rectangular-wave signal; and a microprocessor for collecting the output data of the first and second counters, obtaining a corresponding vibration pattern by comparing the collected data with the data stored in the memory, and controlling a motor of the washing machine. Thus, excessive vibrations in the washing machine can be prevented with high accuracy and precision and also the dehydration time and power consumption can be reduced.

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