AC motor drive apparatus

Details AC motor drive apparatus AC motor drive apparatus

1987-07-09

1988-07-26

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

363 10, 363160, 318729, H02P 528

Patent

active

047603216

ABSTRACT:
An AC motor drive apparatus of this invention is constituted by an AC power source, a first circulating current type cycloconverter having an output terminal coupled to the AC power source, a phase-advanced capacitor coupled to an input terminal of the first cycloconverter, a second circulating current type cycloconverter having an input terminal coupled to the phase-advanced capacitor, and an AC motor coupled to an output terminal of the second cycloconverter. The first cycloconverter controls a current supplied from the AC power source to be a sine wave in the same phase as that of the power source voltage, so that a voltage crest value of the phase-advanced capacitor becomes substantially constant. The second cycloconverter supplies a sine wave current of a variable frequency to the AC motor.

REFERENCES:
patent: 3959720 (1976-05-01), Bose et al.
patent: 4418380 (1983-11-01), Tanaka
patent: 4570214 (1986-02-01), Tanaka
patent: 4673823 (1987-06-01), Tanaka
patent: 4674026 (1987-06-01), Tanaka
International Power Electronics Conference Record: Okuyama et al; Mar. 27, 1983; P720-P731; IPEC--Tokyo 1983.

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