Ac motor drive apparatus

Details Ac motor drive apparatus Ac motor drive apparatus

H - Electricity

02

P

318/120

H02P 27/04 (2006.01)

Patent

CA 1285610

Abstract of the Disclosure 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 cyclocon- verter supplies a sine wave current of a variable frequency to the AC motor.

541730

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