Quick discharge motor starting circuit

Details Quick discharge motor starting circuit Quick discharge motor starting circuit

1986-09-24

1988-01-12

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318794, 318817, H02P 144

Patent

active

047193999

ABSTRACT:
A motor starting control circuit is provided with an auxiliary switch (100), including a triac (102) and series resistor (114), connected across the start capacitor (5) for quickly discharging the start capacitor (5) upon disconnection of the start capacitor (5) from the AC source (4). This enables a lower rated start switch (6) by eliminating extra voltage thereacross caused by an otherwise charged start capacitor (5).

REFERENCES:
patent: 4604563 (1986-08-01), Min
patent: 4622506 (1986-11-01), Shemanske et al.
patent: 4658195 (1987-04-01), Min
patent: 4664563 (1986-08-01), Min
patent: 4670697 (1987-06-01), Wrege et al.
G. E. SCR Manual 4 Edition, General Electric, 1967 pp. 222-223.
Asea Bulletin B10-1112E, Sep. 1983, Edition 6.

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