Speed control apparatus

Details Speed control apparatus Speed control apparatus

1978-04-27

1979-11-27

Rubinson, Gene Z.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318809, H02P 540

Patent

active

041763068

ABSTRACT:
A speed control apparatus includes a plurality of switches disposed between a three phase AC power source and a motor, a low speed control device for feeding power having a frequency lower than the frequency of the power source to the motor under the turn-on control of the switches, and a phase shifting device for shifting the phase order for changing from high speed operation to low speed operation of the motor.

REFERENCES:
patent: 3703672 (1972-11-01), Bird et al.
patent: 3798519 (1974-03-01), Habisohn
patent: 4070605 (1978-01-01), Hoeppner

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