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Rotating electrical machine with electromagnetic and permanent magnet excitation

  • US 5,663,605 A
  • Filed: 05/03/1995
  • Issued: 09/02/1997
  • Est. Priority Date: 05/03/1995
  • Status: Expired due to Fees
First Claim
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1. An electrical machine comprising:

  • a generally-annular stator; and

    a rotor rotatably mounted within said stator and defining an axis of rotation, said rotor having an axially-extending periphery, said rotor comprising a plurality of wound-field poles disposed about at least one portion of said periphery and a plurality of permanent magnet poles all disposed about at least one circumferentially-different portion of said periphery, said wound-field poles in general axial alignment with said permanent magnet poles, said permanent magnet poles each further having a magnetized surface of one polarity generally facing said stator and a magnetized surface of the opposite polarity generally facing away from said stator;

    wherein said wound-field poles are salient poles;

    wherein said permanent magnet poles are disposed in circumferentially-adjacent pairs, without an intervening wound-field pole;

    wherein each said circumferentially-consecutive pair of permanent magnet poles share a common radially-extending base; and

    wherein said wound-field poles are disposed in circumferentially-consecutive pairs, without an intervening permanent magnet pole.

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