Control circuit for linearly controlling the speed and direction

Details Control circuit for linearly controlling the speed and direction Control circuit for linearly controlling the speed and direction

1983-12-15

1985-02-05

Weldon, Ulysses

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318345H, 318257, H02P 512

Patent

active

044980353

ABSTRACT:
A control circuit for use in controlling both the speed and direction of an AC energized DC motor in a linear relationship to the magnitude and polarity of a DC reference signal. This is accomplished with a triggerable bidirectional current conducting device, such as a triac, which is connected in series with a DC motor across an AC power supply source. A control circuit serves to trigger the bidirectional current conducting device into conduction at a selected firing angle during the positive or negative half cycle of the AC source in such a way that the firing angle is linearly related to the magnitude and polarity of a DC reference signal.

REFERENCES:
patent: 3402338 (1968-09-01), Thoresen
patent: 3439246 (1969-04-01), Moritz
patent: 3453517 (1969-07-01), Kennedy et al.
patent: 3551787 (1970-12-01), Walters
patent: 3596158 (1971-07-01), Watrons

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