Electronic circuit for a single phase induction motor starting

Details Electronic circuit for a single phase induction motor starting Electronic circuit for a single phase induction motor starting

1990-11-19

1991-09-24

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318781, 318817, H02P 144

Patent

active

050516817

ABSTRACT:
An electronic circuit for starting a single phase induction motor operating from a source of alternating current, the motor having a cage type rotor, a coiled stator having at least a main winding and a starting winding, and a permanent capacitor connected in series with the starting winding. The permanent capacitor and the starting winding are connected in parallel to the alternating current source and the main winding in series. A TRIAC has a first terminal connected to one side of the alternating current source and a second terminal connected to the starting winding and to the permanent capacitor. A TRIAC trigger circuit is connected between the TRIAC second terminal and its GATE terminal and a bilateral swtich is connected to the TRIAC GATE terminal. A timer circuit is connected to the bilateral switch and to the alternating current source, the timer circuit defining the time elapsed from the motor powering up till the interruption of the TRIAC conduction by turning on the bilateral switch, the TRIAC trigger circuit repeatedly triggering the TRIAC to a turn on condition at the beginning of each current half-cycle while the bilateral switch remains cut off by the timer circuit.

REFERENCES:
patent: 3538411 (1970-11-01), Knauer et al.
patent: 3970908 (1976-07-01), Hansen et al.
patent: 4622506 (1986-11-01), Shemanske et al.
patent: 4651077 (1987-03-01), Woyski
patent: 4670697 (1987-06-01), Wrege et al.
patent: 4782278 (1988-11-01), Bossi et al.

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