Motor control system incorporating digital top speed limiting ar

Details Motor control system incorporating digital top speed limiting ar Motor control system incorporating digital top speed limiting ar

1979-02-08

1980-04-22

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318314, 318327, 318345C, H02P 516

Patent

active

041997123

ABSTRACT:
An SCR motor speed control system having a capacitor for triggering the SCR into conduction is provided with circuitry for limiting the top speed of the motor by sensing the time of a predetermined proportion of a motor revolution to determine the motor speed. When the time is below a predetermined time interval, indicative of motor speed above a desired top speed limit, a path is closed to bypass the charging path of the capacitor.

REFERENCES:
patent: 3249839 (1966-05-01), Fay
patent: 3286151 (1956-11-01), Dinger
patent: 3386021 (1968-05-01), Fischer
patent: 3569807 (1971-03-01), Ulrich
patent: 3601677 (1971-08-01), McDavid

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