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System and method for detecting fault in an AC machine

  • US 8,405,339 B2
  • Filed: 07/01/2010
  • Issued: 03/26/2013
  • Est. Priority Date: 07/01/2010
  • Status: Active Grant
First Claim
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1. A controller configured to detect a rotor fault condition, the controller having a processor programmed to:

  • receive voltage and current data from an AC induction machine;

    generate a current frequency spectrum from the current data;

    identify rotor-fault related harmonics in the current frequency spectrum;

    calculate a fault severity indicator using the voltage and current data, identified rotor-fault related harmonics, and motor specifications;

    analyze the fault severity indicator to determine a possibility of rotor fault; and

    generate an alert based on the possibility of rotor fault.

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