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Motor including embedded permanent-magnet rotor

  • US 5,554,900 A
  • Filed: 02/04/1994
  • Issued: 09/10/1996
  • Est. Priority Date: 02/04/1994
  • Status: Expired due to Fees
First Claim
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1. A rotor of cylindrical configuration for use in a motor having a high torque to size ratio, said rotor having an outer cylindrical peripheral surface and comprising:

  • a central rotor shaft with a center axis;

    at least first and second retainers securely mounted on said shaft in spaced opposed relation to one another;

    a plurality of magnetically conductive segments arrayed around said shaft between said first and second retainers with each of said segments spanning a circumferential sector of said cylindrical configuration;

    magnets disposed between each adjacent pair of said segments for providing magnetic flux through said adjacent segments for linking through a stator disposed around said peripheral surface;

    each of said segments having an opening extending therethrough in generally spaced parallel relation to said shaft, each of said openings being of a cross-section which is elongated radially, namely having a length as measured parallel to a radial plane through the center axis of said shaft which is significantly greater than the width of said opening as measured normal to such radial plane; and

    a non-magnetic securing bar extending through each of said openings and engaging the respective segment at the radially inward side of said opening to support said segment at least in a radial direction, each of said securing bars being a separate element spaced from said shaft and being in radial support engagement with said retainers whereby said bars and said retainers support said segments in predetermined positions in said rotor.

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