Start switch for a single phase AC motor

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

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Details

318787, 318786, 318785, 307140, H02P 144

Patent

active

046510770

ABSTRACT:
A start switch is provided for a single phase AC motor having a start winding and a start capacitor connected in series with the start winding and a main winding connected in parallel with the start winding and start capacitor. The AC motor is connectable with an AC power source in order to supply AC main winding voltage to the main winding and AC start winding voltage to the start winding. The start switch includes conductors connected with the main winding for sensing the AC main winding voltage and conductors connected with the start winding for sensing the AC start winding voltage. Phase sensor circuitry is employed to sense a difference in voltage phase between the start winding voltage and the main winding voltage. Detector circuitry is connected with the phase sensor circuitry to detect when the difference in the voltage phase reaches a threshold. An AC switch is connected in series with the start capacitor and the start winding to connect and disconnect the start winding and start capacitor to and from the AC power source. Actuator circuitry for the AC switch is responsive to the detector circuitry for actuating the AC switch to disconnect the start winding and the start capacitor from the AC power source when the difference in voltage phase reaches the threshold.

REFERENCES:
patent: 3489969 (1970-01-01), Knauer et al.
patent: 3530348 (1970-09-01), Conner
patent: 3538411 (1970-11-01), Knauer et al.
patent: 3573579 (1971-04-01), Lewus
patent: 3671830 (1972-06-01), Kruper
patent: 3746951 (1973-07-01), Hohman
patent: 3761792 (1973-09-01), Whitney et al.
patent: 3777232 (1973-12-01), Woods et al.
patent: 3970908 (1976-07-01), Hansen et al.
patent: 4307327 (1981-12-01), Streater et al.
patent: 4375613 (1983-03-01), Fuller et al.
patent: 4486700 (1984-12-01), Kawate et al.
Marckel, "Motor Start Switch", IBM Technical Disclosure Bulletin, vol. 14, No. 6, Nov. 1971.
Buckley, "Solid-State AC Motor Start Switch", Electrotechnology, vol. 6, No. 4, Oct. 1978.

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