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Permanent magnet direct current motor apparatus

  • US 4,684,855 A
  • Filed: 10/07/1985
  • Issued: 08/04/1987
  • Est. Priority Date: 03/12/1984
  • Status: Expired due to Fees
First Claim
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1. A permanent magnet d.c. motor apparatus comprising:

  • A. rotor means having a homogeneous core surrounding a longitudinal axis upon which is mounted an outer, segmented ring formed of a plurality of alternating polarized groups of magnets, such that any first group of magnets of a polarized group and other polarized groups of magnets has an end magnet juxtaposed to an end magnet of a second group of magnets of said polarized groups of magnets for providing a plurality of spatially distributed, localized magnetic flux about the outer circumference of said outer segmented ring;

    B. stator means having a plurality of cylindrically spaced rows of electrically conductive coils which are radially disposed outside of said rotor means for electromagnetic coupling to said spatially distributed, localized magnetic flux about said rotor circumference of said outer segmented rings;

    C. timing means for providing a periodic timing pulse in response to rotation of said rotor, and;

    D. electronic control means responsive to said periodic timing pulse for providing a sequential flow of current to said conductive coils, whereupon said current is directly proportional to a generation of said periodic timing pulses during one revolution of said rotor;

    wherein said timing means is mounted for rotation with said rotor comprising;

    a circular disk with a plurality of radially disposed electrical contacts mounted thereon;

    a plurality of fixed contacts which contact said radially disposed electrical contacts as the disk rotates;

    a d.c. electrical potential connected to said radially disposed electrical contacts;

    a timing pulse conductor between said radially disposed electrical contacts and said electronic control means, said conductor providing an electrical path to communicate periodic timing pulses.

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