Control for three phase A.C. motor

Details Control for three phase A.C. motor Control for three phase A.C. motor

1974-01-30

1976-01-13

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307252N, 307252Q, 307269, 323 22SC, 323 24, H03K 504

Patent

active

039327710

ABSTRACT:
A solid state trigger circuit provides variable period output signals within a timed sequence of signals for controlling conduction angle firing of thyratron type switching devices in an A.C. phase line. A bi-stable multivibrator receives timing signals derived from the alternating current in the phase line which are out of phase with each other. The timing signals oscillate the multivibrator at a desired timing rate to produce an output of the multivibrator which has voltage transition spikes at the beginning of each positive circle of the timing signals. A saw tooth wave form with a linear voltage input control signal indicative of a desired time period pulse width provides a square wave trigger output signal with signal pulse periods equal to the desired pulse width.

REFERENCES:
patent: 3336531 (1967-08-01), Yamada
patent: 3564388 (1971-02-01), Nolf
patent: 3601708 (1971-08-01), Stempler et al.

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