Speed control circuit for AC motor

Details Speed control circuit for AC motor Speed control circuit for AC motor

1986-01-21

1987-06-16

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318809, 318345CB, H02P 540

Patent

active

046738606

ABSTRACT:
The invention discloses a speed variator for an AC motor included preferably in a food processing apparatus. The variator comprises a controllable switching member, such as a triac, and an RC circuit for regulating the motor speed to a predetermined speed. A current compensating circuit is provided, connected across the terminals of capacitors in the regulating circuit and to a terminal of the variator for compensating a current increase to maintain the predetermined motor speed regardless of the fluctuations of the load torque on the motor during motor operation.

REFERENCES:
patent: 3443189 (1969-05-01), Gilbreth
patent: 3678360 (1972-07-01), Minrik et al.
patent: 3697863 (1972-10-01), Kilner
patent: 3742337 (1973-06-01), Digneffe
patent: 4271386 (1981-06-01), Lee
patent: 4392093 (1983-07-01), Paule et al.

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