Yaskawa America, Inc.

Steven Hartig

Mahesh M Swamy

Mark Baumgardner

Daniel Nitzsche

A motor drive system output filter includes fault detection. A variable frequency drive (VFD) drives a three phase AC induction motor. A filter circuit is connected between the VFD and the AC induction motor. The filter circuit comprises a filter for each phase. Each filter comprises an inductor and a damping resistor connected in series with a blocking capacitor across the inductor. A plurality of detection circuits are provided, one for each phase. Each detection circuit is connected to the capacitor of the associated phase for detecting capacitor voltage to indicate a resistor fault condition.

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Milwaukee, WI, United States of America

Steven Hartig