Low cost, load and speed sensitive motor control starting circui

Details Low cost, load and speed sensitive motor control starting circui Low cost, load and speed sensitive motor control starting circui

1986-07-14

1987-06-02

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318785, H02P 144

Patent

active

046706976

ABSTRACT:
A low cost, low part content single phase AC induction motor control starting circuit is provided which is speed sensitive, load sensitive and AC line voltage fluctuation insensitive. A quad comparator chip (61-64) senses and compares relative magnitudes of main and auxiliary winding voltages (30, 32 and 42) to de-energize the auxiliary winding (2) at cut-out speed, and automatically re-energize the auxiliary winding (2) at cut-in speed to accelerate or restart the motor from a stall or overload condition. Simplified power supply and voltage detection circuitry is also disclosed.

REFERENCES:
patent: 3421064 (1969-01-01), Phillips
patent: 3671830 (1972-06-01), Kruper
patent: 3761792 (1973-09-01), Whitney et al.
patent: 3792324 (1974-02-01), Suarez et al.

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