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Electrical machine safety system

  • US 8,648,575 B2
  • Filed: 03/28/2011
  • Issued: 02/11/2014
  • Est. Priority Date: 03/29/2010
  • Status: Expired due to Fees
First Claim
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1. An electrical machine system comprising a permanent magnet assembly having a magnetic field and a plurality of conductive coils, the magnet assembly and coils arranged for relative rotation between the coils and magnetic field in the manner of an electrical generator or motor, the system further comprising a current injector electrically connected to said coils and arranged selectively to supply a current signal thereto, the current signal being asynchronous with the frequency of rotation between the permanent magnet assembly and coils so as to heat and thereby demagnetise one or more magnet within said permanent magnet assembly.

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