Rate effect motor start circuit

Details Rate effect motor start circuit Rate effect motor start circuit

1994-04-11

1996-12-31

Sircus, Brian

Electricity: motive power systems

Induction motor systems

Primary circuit control

318786, H02P 142, H02P 144

Patent

active

055897533

ABSTRACT:
A start circuit for a single phase AC induction motor employs a triac or similar device in series with the motor start or auxiliary winding. The triac device has associated circuitry so that it turns on in response to an increase in the time rate of change of applied voltage. In one version a PNP transistor and a capacitive timing circuit are employed to cut in the start winding. In another version a second, pilot triac is employed.

REFERENCES:
patent: 3657620 (1972-04-01), Fricker
patent: 3740632 (1973-06-01), Whitney et al.
patent: 3746951 (1973-07-01), Hohman
patent: 3761792 (1973-09-01), Whitney et al.
patent: 3832612 (1974-08-01), Woods
patent: 4382217 (1983-05-01), Horner et al.
patent: 4605888 (1986-08-01), Kim
patent: 4651077 (1987-03-01), Woyski
patent: 4770417 (1988-09-01), Blair

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