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MOTOR PHASE WINDING FAULT DETECTION METHOD AND APPARATUS

  • US 20110089883A1
  • Filed: 10/21/2009
  • Published: 04/21/2011
  • Est. Priority Date: 10/21/2009
  • Status: Abandoned Application
First Claim
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1. A method of detecting a phase winding fault in a multi-phase electric machine, the method comprising:

  • measuring a set of feedback signals of the electric machine, including a phase current for each phase thereof;

    generating reference phase voltages for each phase using a controller;

    calculating a predetermined voltage value using the feedback signals and each of the reference phase voltages;

    comparing the predetermined voltage value to a calibrated threshold to determine the presence of the phase winding fault; and

    executing a control action when the predetermined voltage value exceeds the calibrated threshold;

    wherein the predetermined voltage value is at least one of;

    a ratio (F) of a normalized zero sequence voltage (V0

    norm) to a modulation index (Mi), a root mean square (RMS) voltage (Vrms) for each phase, and a total harmonic distortion (THD) of each of the phase currents.

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