Motor starting circuit with low cost comparator hysteresis

Details Motor starting circuit with low cost comparator hysteresis Motor starting circuit with low cost comparator hysteresis

1987-07-22

1988-11-01

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318785, 318778, H02P 142

Patent

active

047822783

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 dual comparator chip (20, 22) senses and compares relative magnitudes of AC line and auxiliary winding voltages (48, 40) to de-energize the auxiliary winding (2) at cut-out speed, and automatically re-energize the auxiliary winding at cut-in speed to accelerate or restart the motor from an overload or stall condition. Hysteresis circuitry (20, 50, 52, 57, 80) provides a lower cut-in speed than cut-out speed. Simplified power supply and voltage detection circuitry is also disclosed.

REFERENCES:
patent: 3882364 (1975-05-01), Wright et al.
patent: 3970908 (1976-07-01), Hansen et al.
patent: 4375613 (1983-03-01), Fuller et al.
patent: 4382217 (1983-05-01), Horner et al.
patent: 4604563 (1986-08-01), Min
patent: 4605888 (1986-08-01), Kim
patent: 4622506 (1986-11-01), Shemanske et al.
patent: 4651077 (1987-03-01), Woyski
patent: 4658195 (1987-04-01), Min
patent: 4670697 (1987-06-01), Wrege et al.

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