Motor speed control circuit

Details Motor speed control circuit Motor speed control circuit

H - Electricity

02

P

318/94

H02P 5/00 (2006.01) H02P 7/00 (2006.01) H02P 25/10 (2006.01)

Patent

CA 1194924

Abstract of the Disclosure A motor speed control circuit for closed loop control of an electric motor of a household electric appliance is dis- closed herein. The motor speed control circuit includes a coil adapted to be placed in proximity with a fan connected to an electric motor and producing a time varying signal in response to rotation thereof. A comparator connected to the coil gener- ates a rectangular wave having a frequency proportional to the frequency of the coil signal. Additional means are provided for converting the rectangular wave signal, a D.C. signal having an amplitude which corresponds to the frequency of the rectan- gular wave. The D.C. signal is compared to a reference signal at an amplifier to produce an error signal which is fed through an opto-isolator to a conduction angle controlled thyrister. The thyrister is connected to the electric motor and a source of electric power to control the speed of the electric motor.

419985

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