AC motor drive apparatus

Details AC motor drive apparatus AC motor drive apparatus

1987-06-17

1989-06-27

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318801, 363 37, H02P 540

Patent

active

048432962

ABSTRACT:
An apparatus according to this invention includes a DC power source, a DC-AC power converter having an output terminal coupled to the DC power source via a DC reactor, a high-frequency, phase-advanced capacitor coupled to an input terminal of the DC-AC power converter, a circulating current type cycloconverter having an input terminal coupled to the phase-advanced capacitor, and an AC motor coupled to the output terminal of the cycloconverter. In this apparatus, a current supplied from the DC power source is controlled by the DC-AC power converter, so that a crest value of a voltage applied to the phase-advanced capacitor is substantially constant. The cycloconverter controls to supply a sine wave current of a variable frequency (0 to several hundred Hz) to the AC motor.

REFERENCES:
patent: 3323032 (1967-05-01), Agarwal et al.
patent: 3431483 (1969-03-01), Lafuze
patent: 4327313 (1982-04-01), Isuboi et al.
patent: 4335337 (1982-06-01), Okamatsu et al.
patent: 4529925 (1985-07-01), Tanaka et al.
patent: 4544873 (1985-10-01), Salihi et al.

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