Energy economizing AC power system

Electricity: motive power systems – Induction motor systems – Primary circuit control

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718812, H02P 736

Patent

active

048642126

ABSTRACT:
An energy economizing AC power control system for energizing an induction motor comprises a sine wave power source which is connected via a triac to the motor, and a control circuit which controls the conduction of the triac as a function of the load on the motor to provide the motor with short bursts of energy. The control circuit includes a field effect transistor having a gate electrode which is energized by a train of sawtooth shaped control signals having a repetition rate which is twice the frequency of the power source, and DC bias potential is also applied to the gate electrode with the magnitude of the DC bias potential being varied with variations in the current flowing through the motor stator winding. The field effect transistor is rendered conductive during the sawtooth excursion of each of the control signals, at a time subsequent to the commencement of each sawtooth signal, which is jointly dependent on the instantaneous magnitude of the rising excursion of each sawtooth signal and the magnitude of the DC bias potential. The field effect transistor generates a pulse during each sawtooth excursion, at a time following commencement of the sawtooth excursion which is accordingly dependent on the load on the motor, and each such pulse is used to determine the time at which the triac commences conduction during each half wave of energy from the sine wave power source.

REFERENCES:
patent: 3441823 (1969-04-01), Schlabach
patent: 4369403 (1983-01-01), Lee
patent: 4482852 (1984-11-01), Muskovac
Marcus, J., Sourcebook of Electronic Circuits, McGraw Hill, 1968, p. 812.
Electronic Circuit Design Handbook, Tab Books, 1970 p. 726.

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