Motor starting circuit with time delay cut-out and restart

Details Motor starting circuit with time delay cut-out and restart Motor starting circuit with time delay cut-out and restart

1987-08-13

1988-11-22

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318785, H02P 144

Patent

active

047868503

ABSTRACT:
A motor starting circuit (10) is provided for disconnecting the start winding (14) of a single phase AC induction motor from an AC source (18) after a time delay. A start switch (22) in series with the start winding (14) controls energization and disconnection of the start winding (14). Turn-on of the start switch (22) is controlled by a turn-on switch 28 connected in parallel across the start switch (22) and not across the start winding (14). Turn-off of the start switch (22) is controlled by a cut-out switch (50) which in turn is controlled by an RC timing circuit (58, 60) connected across the AC source (14). A restart switch (64) may be added without changing the remaining circuitry. The restart switch (64) controls charging of the timing capacitor (60) and causes reconnection of the start winding (14) to the AC source (18) when motor speed drops below a given cut-in speed.

REFERENCES:
patent: 4605888 (1986-08-01), Kim

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