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EMI filter and method

  • US 5,483,136 A
  • Filed: 05/27/1994
  • Issued: 01/09/1996
  • Est. Priority Date: 05/27/1994
  • Status: Expired due to Term
First Claim
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1. In a control system for a dynamoelectric machine including a stator assembly having a plurality of windings, a rotor assembly mounted for rotation with respect to said stator assembly, an inverter operatively connected to said windings to supply the electrical energy to said windings in a predetermined manner, a bridge rectifier electrically connected to a source of power, said bridge rectifier having an input side and an output side, said rectifier defining on its output side first and second rails, said inverter being operatively connected between said first and second rails on its input side and to said dynamoelectric machine at its output side, the improvement comprising an electromagnetic interference filter for reducing electromagnetic interference associated with said control system and said dynamoelectric machine, said filter including a lossy core inductor having magnetically coupled first and second coils, one each of said first and second coils being serially connected in one each of said first and said second rails on the output side of said rectifiers;

  • and a fourth order filter having 0.5 degree equiripple approximation to linear phase operatively connected on the input side of said bridge rectifier.

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