Motor speed control circuits

Details Motor speed control circuits Motor speed control circuits

1977-07-11

1979-04-17

Smith, Jr., David

Electrical transmission or interconnection systems

Switching systems

Switch actuation

68 12R, 307141, 318484, H01H 4700

Patent

active

041503031

ABSTRACT:
A motor speed control circuit for use in a washing machine includes a timer which in normal operation accelerates the motor from a wash speed to a distribution speed before a fast acceleration to the spin dry speed. The control circuit includes speed measurement means for maintaining the motor at spin speed in the event of a power interruption during a spin cycle provided the drum speed remains above a given critical speed when the power returns. If not, a redistribution cycle takes place before the motor is accelerated to its spin speed.

REFERENCES:
patent: 3640098 (1972-02-01), Eastall
patent: 3783651 (1974-01-01), Karklys
patent: 3939673 (1976-02-01), Thibaut

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