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FAULT DETECTION IN INDUCTION MACHINES

  • US 20150260794A1
  • Filed: 02/19/2015
  • Published: 09/17/2015
  • Est. Priority Date: 03/11/2014
  • Status: Active Grant
First Claim
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1. A method of detecting a fault in an induction machine having one or more windings arranged to draw current at a supply frequency, the method comprising:

  • performing a process of judging whether a respective sideband of one or more selected harmonics of the supply frequency exists at a predetermined fault frequency in a signal in the one or more windings; and

    determining that a fault has occurred if the judgement is positive;

    wherein in the judging process each of the selected harmonics of the supply frequency is a harmonic frequency of the supply frequency other than the supply frequency itself; and

    determining whether the power distribution of at least one of the selected harmonics to its sidebands is below a predetermined threshold; and

    determining the fault type based on the determination.

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