Motor starting circuit

Details Motor starting circuit Motor starting circuit

1987-11-13

1989-02-14

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318785, H02P 144

Patent

active

048049018

ABSTRACT:
A start circuit for an induction motor having a main winding and a start winding includes a sensor of main-winding current. A detector detects the level of main-winding current sensed by the sensor. The start circuit includes a reference generator driven by the level detector and providing a reference level proportional to an average value of main-winding current. The reference level can vary slowly in accordance with a long-term drift in magnitude of the main-winding current. A switch energizes and deenergizes the start winding in accordance with relative values of a signal of the detector and the reference level, thereby allowing for automatic restarting in the event of a sudden increase of current due to a motor stall.

REFERENCES:
patent: 3414789 (1968-12-01), Prouty
patent: 3740631 (1973-06-01), Fricker et al.
patent: 4196462 (1980-04-01), Pohl
patent: 4375613 (1983-03-01), Fuller et al.
patent: 4605888 (1986-08-01), Kim
patent: 4622506 (1986-11-01), Shemanske et al.
patent: 4658195 (1987-04-01), Min

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