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Light weight machine with rotor employing permanent magnets and consequence poles

  • US 5,705,917 A
  • Filed: 09/14/1994
  • Issued: 01/06/1998
  • Est. Priority Date: 09/14/1994
  • Status: Expired due to Fees
First Claim
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1. A machine comprising a stator and a rotor, the stator including a plurality of windings, and the rotor comprising a body of soft-magnetic material with a plurality of permanent magnets in a surface disposed proximate to the stator, separated from the stator by a predetermined gap distance, such that relative motion of the rotor and stator causes magnetic flux from the permanent magnets to interact with and induce current in the stator windings, wherein the permanent magnets are high energy product magnets with a predetermined surface area, and the permanent 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, and the magnets are disposed within the insets, separated from adjacent consequence poles by a predetermined distance, improved wherein:

  • the surface area of the permanent magnets proximate to the stator is greater than the surface area of the consequence poles proximate to the stator by the ratio of the flux density produced by the permanent magnet to the allowed flux density of the consequence pole;

    the permanent magnets have a flux density of at least on the order five kilogauss;

    the insets are symmetrically disposed in the rotor surface proximate to the stator, the consequence poles are symmetrically disposed in the rotor surface proximate to the stator and the permanent magnets are centrally disposed within the insets;

    the distance separating the permanent magnets from the consequence poles is greater than the distance separating the rotor surface from the stator;

    the rotor comprises a hollow cylinder with the magnets mounted on an internal surface of the cylinder, and the stator is concentrically disposed within the cylinder;

    the stator is generally annular with a central aperture and the rotor is concentrically disposed for rotation within the aperture, the rotor being adapted for mounting on a shaft journaled through the stator central aperture; and

    the stator includes a first winding for generating a relatively high voltage low amperage signal and a second winding for generating a relatively low voltage high amperage signal;

    and the machine further including;

    a first rectification circuit, responsive to signals from the first stator winding, for generating a relatively high voltage low amperage DC signal; and

    a second rectification circuit, responsive to signals from the second stator winding, for generating a relatively low voltage high amperage DC signal.

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