Electrical control circuit

Electricity: motive power systems – Induction motor systems – Primary circuit control

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Details

318785, H02P 142, H02P 144

Patent

active

043756131

ABSTRACT:
The present invention concerns electrical control circuits which are particularly applicable to use and controlling the starting of electric motors. The invention thus provides a sensing and switching circuit capable of automatically to bring into and out of operation the start winding of an electric motor at appropriate motor speeds. Appropriate means sense a voltage or current level and a trigger response to the sensed value to supply firing pulses to the gate of a triac. The trigger element is preferably an M.O.S. integrated circuit multivibrator.

REFERENCES:
patent: 3307093 (1967-02-01), Wright
patent: 3538411 (1970-11-01), Knauer et al.
patent: 3740631 (1973-06-01), Fricker et al.
patent: 3882364 (1975-05-01), Wright et al.

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