Permanent split-phase capacitor induction motor

Details Permanent split-phase capacitor induction motor Permanent split-phase capacitor induction motor

1985-10-08

1987-06-09

Wong, Peter S.

Electricity: motive power systems

Induction motor systems

Reversing

318781, 318817, H02P 318

Patent

active

046722840

ABSTRACT:
A permanent split-phase capacitor induction motor having a capacitor (7) connected in series with an auxiliary winding (5) via an electronic switch (9) which is operated by a control circuit (11, 13) so as to obtain a higher starting torque than if the switch were permanently closed.
The control circuit suitably comprises an integrating (21 to 31) responsive to the voltage appearing across the switch (9) and trigger circuit (19) which closes the switch when the output of the integrating circuit exceeds a threshold value, the integrating circuit resetting when the switch closes, and the switch reopening at the next current zero.

REFERENCES:
patent: 4271386 (1981-06-01), Lee
patent: 4382217 (1983-05-01), Horner et al.
patent: 4409528 (1983-10-01), Podell
patent: 4409532 (1983-10-01), Hollenbeck et al.
patent: 4496895 (1985-01-01), Kawate et al.
patent: 4520303 (1985-05-01), Ward

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