Polyphase machine fed by a pulse-controlled a.c. converter

Details Polyphase machine fed by a pulse-controlled a.c. converter Polyphase machine fed by a pulse-controlled a.c. converter

1990-08-15

1991-07-23

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318808, H02P 540

Patent

active

050346750

ABSTRACT:
A polyphase machine fed by a pulse-controlled a.c. converter in which the current is controlled between rectangular and sine-shaped waveforms in each half cycle according to the required torque. Independently of the current control, the active number of phase windings is reduced as a function of the rotational speed of the machine.

REFERENCES:
patent: 3297926 (1967-01-01), Campbell et al.
patent: 4047083 (1977-09-01), Plunkett
patent: 4091294 (1978-05-01), Zankl et al.
patent: 4333042 (1982-06-01), Kawada et al.

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