Ac motor drive apparatus

Details Ac motor drive apparatus Ac motor drive apparatus

H - Electricity

02

M

318/103

H02M 5/27 (2006.01) H02M 5/45 (2006.01)

Patent

CA 1293529

ABSTRACT OF THE DISCLOSURE An AC motor drive apparatus comprising a DC/AC power converter having a DC terminal coupled to a DC power source; a capacitor coupled to an AC terminal of said DC/AC power converter; a circulating current cycloconverter having an input terminal coupled to said capacitor and an output terminal coupled to an AC motor; a first control means coupled to said DC/AC power converter, responsive to a predetermined crest value Vcap*, to control said DC/AC power converter such that a crest value Vcap of a voltage on said capacitor substantially matches said predetermined crest value Vcap*; and a second control means coupled to said cycloconverter, responsive to a current supplied from said cycloconverter to said AC motor and to a reference signal having a given frequency and phase, to control said cycloconverter such that a frequency and phase of the voltage on said capacitor substantially match the frequency and phase of said reference signal, respectively.

539867

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