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High speed DC motor

  • US 4,947,071 A
  • Filed: 01/30/1988
  • Issued: 08/07/1990
  • Est. Priority Date: 02/02/1987
  • Status: Expired due to Term
First Claim
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1. A DC motor comprising:

  • a. a stator having a central rotor cavity and containing a stator set of electromagnets facing inward in a circumferential path about the rotor cavity;

    b. a rotor rotatably mounted in the central rotor cavity, the rotor having a rotor set of magnets, each magnet of the rotor set of magnets having at least one pole facing outward in a circumferential path about the periphery of the rotor and aligned with the electromagnets of the stator sets of electromagnet;

    c. a source of current to each electromagnet of the stator set of electromagnets;

    d. rotor position sensing means for each electromagnet of the stator set of electromagnets for sensing the position of points on the rotor with regard to corresponding points on the stator; and

    e. switching means between the source of current and each electromagnet of the stator set of electromagnets and operably connected to a corresponding rotor position sensing means for alternatively controlling current to selected electromagnets, the switching means energizing the electromagnets to be of a pole to attract the pole of the magnets of the rotor set of magnet when the magnets of the rotor set of magnets approach the electromagnet and energizing the electromagnets to be of a pole to repel the pole of the magnets of the rotor set of magnets when the magnets of the rotor set of magnets recedes from the electromagnets as the rotor rotates.

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