Method and apparatus for controlling an alternating current moto

Details Method and apparatus for controlling an alternating current moto Method and apparatus for controlling an alternating current moto

1988-12-12

1989-10-10

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318723, 318809, H02P 126

Patent

active

048734780

ABSTRACT:
A system for controlling a polyphase electric motor, particularly at low speeds, using a load commutated inverter includes the generation of half sine wave signals within a range of desired frequencies which are subsequently converted to single phase alternating current power for application to selected windings of the motor. In a single channel polyphase embodiment, motor starting is achieved using zero current commutation and normal phase control. A two channel embodiment results in what amounts to two phase operation of the motor.

REFERENCES:
patent: 3696278 (1972-10-01), Kuniyoshi et al.
patent: 3991354 (1976-11-01), Rosa et al.
patent: 4426611 (1984-01-01), Espelage et al.
patent: 4443747 (1984-04-01), Chausse et al.
patent: 4449087 (1984-05-01), Lippitt et al.
patent: 4488101 (1984-12-01), Studtmann
patent: 4602198 (1986-07-01), Weiss et al.
"Thyristor Phase-Controlled Converters and Cycloconverters" by Brian R. Pelly Lib. Cong. Cat. Card No. 70-125276, pp. 145-161.

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