Variable motor speed control for automatic washer

Details Variable motor speed control for automatic washer Variable motor speed control for automatic washer

H - Electricity

02

P

341/92, 318/96

H02P 3/20 (2006.01) D06F 33/02 (2006.01) D06F 37/40 (2006.01) G05B 19/00 (2006.01) H02P 3/00 (2006.01) H02P 7/00 (2006.01)

Patent

CA 1299236

ABSTRACT OF THE DISCLOSURE A variable speed control is provided for controlling a reversing permanent split capacitor motor in an automatic washer. The operation of the motor is controlled such that the motor will accelerate for a first predetermined time period and then coast with no power applied for a second predetermined time period. This generalized operation of the motor occurs in the spin cycle. In the agitate cycle, a logic decoding circuit uses a tach pulse signal indicative of the speed of the motor to provide a time for the motor to be on, and utilizes an AC line current zero crossing signal from a zero crossing detector to establish a time during which the motor is off, the motor on plus off time establishing a stroke rate for the agitate cycle.

597812

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