Speed control for a universal electric motor

Details Speed control for a universal electric motor Speed control for a universal electric motor

1978-01-16

1979-01-09

Rubinson, Gene Z.

Electricity: motive power systems

Alternating current commutating motors

Universal or a.c.-d.c. motors

318332, 318812, H02P 540

Patent

active

041340388

ABSTRACT:
A first thyristor, under control of a speed setting provided in an RC circuit varies the phase duration of current supply to the motor during positive halfwaves of the a c supply, and a second thyristor controlled in accordance with the motor current provided through the first thyristor determines the phase angle during which current flows through the motor in the negative halfwave of the voltage supply, so as to maintain the speed at the set value under varying conditions of load. During positive halfwaves, a capacitor is charged to a voltage corresponding to the amount of current flow through the motor and during the following negative halfwave, the charge is increased at a rate set by an RC circuit, resulting in turning on the second thyristor early under heavy load conditions, and late under light load conditions, and indeed not at all under idling conditions.

REFERENCES:
patent: 3366861 (1968-01-01), Dudler
patent: 3399333 (1968-08-01), Canter
patent: 3596158 (1971-07-01), Watrous

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