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Method and apparatus for testing laminated cores of electrical machines

  • US 20030117144A1
  • Filed: 12/03/2002
  • Published: 06/26/2003
  • Est. Priority Date: 12/04/2001
  • Status: Active Grant
First Claim
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1. Apparatus for testing a laminated core of an electrical machine, the apparatus comprising:

  • excitation signal generating means, arranged to generate an excitation signal at a first frequency which is higher than the rated operating frequency of said electrical machine, for supply to an excitation winding coupled to the laminated core of the electrical machine; and

    a phase sensitive detector arranged to receive a first, reference signal having a reference phase and to receive from the laminated core of the electrical machine a second, test signal having a test amplitude and phase, each in response to the excitation signal applied to the excitation winding, the phase sensitive detector being arranged to resolve the test signal into a plurality of components relative to said reference phase of said reference signal and to generate an output signal, the level of said output signal being indicative of the severity of a fault between the laminations of said laminated core.

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