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Light weight rotor and stator with multiple coil windings in thermal contact

  • US 5,929,611 A
  • Filed: 04/16/1997
  • Issued: 07/27/1999
  • Est. Priority Date: 09/14/1994
  • Status: Expired due to Fees
First Claim
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1. Apparatus comprising a stator including at least one winding, and a rotor disposed relative to the stator such that relative motion of the rotor and stator causes magnetic flux from the rotor to interact with and induce current in the stator winding,wherein the stator comprises:

  • a soft-magnetic core;

    a first winding, including a predetermined number of turns corresponding to a first predetermined voltage output; and

    a second winding, including a predetermined number of turns corresponding to a second predetermined voltage output;

    the respective windings being grouped together as a unit and wound about the core such that the respective winding coils are wound in thermal contact with each other;

    and wherein;

    the rotor comprises a body of soft magnetic material with a plurality of permanent magnets in a surface disposed proximate to the stator;

    the magnets have a predetermined surface area;

    the magnets are mounted in insets formed in the rotor surface proximate to the stator;

    the rotor surface proximate to the stator includes portions between the insets to form respective consequence poles, each consequence pole having a predetermined surface area;

    the magnets are disposed within the insets, separated from adjacent consequence poles by a predetermined distance; and

    the surface area of the magnets proximate the stator is greater than the surface area of the consequence poles proximate the stator.

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