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Hybrid alternator

  • US 5,397,975 A
  • Filed: 06/14/1993
  • Issued: 03/14/1995
  • Est. Priority Date: 06/14/1993
  • Status: Expired due to Term
First Claim
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1. A hybrid alternator comprising:

  • a stator having a stator winding;

    a rotor mounted for rotation within the stator and separated therefrom by a radial air gap, the rotor including;

    a shaft mounted for rotation within the stator,a wound field rotor portion mounted on the shaft for rotation within a first longitudinal region of the stator, the wound field rotor portion having a plurality of laminations arranged perpendicular to the shaft, a rotor winding and multiple electromagnetic poles defined by a plurality of radially oriented projections from each of said laminations, one for each of said electromagnetic poles, the laminations being stacked together to form a salient pole rotor core and the rotor winding being wound around the radial projections of the rotor core to form a plurality of coils around the rotor core, adjacent ones of said coils being wound in opposite directions to produce alternating north and south magnetic fields in adjacent ones of said electromagnetic poles when current is passed through the rotor winding, anda permanent magnet rotor portion mounted on the shaft in longitudinally spaced relation to the wound field rotor portion for rotation within a second longitudinal region of the stator, the permanent magnet rotor portion having multiple permanent magnetic poles defined by one or more permanent magnets, the number of permanent magnetic poles corresponding in number to the number of said electromagnetic poles in the wound field rotor portion.

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