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Electronically commutated, collectorless direct-current motor

  • US 4,633,109 A
  • Filed: 10/23/1985
  • Issued: 12/30/1986
  • Est. Priority Date: 10/23/1984
  • Status: Expired due to Fees
First Claim
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1. An electronically commutated, collectorless direct current motor comprising, in combination:

  • a stator comprised of an external magnetic yoke, a stator winding and an internal magnetic yoke;

    a rotor rotationally arranged between the stator winding and the internal magnetic yoke, the rotor being a permanent magnet rotor and designed in the form of a cup-shaped hollow cylinder comprised of a non-magnetic material and mechanically connected to a motor shaft;

    an insulating body employed in the fabrication of the stator winding, said insulating body having a first side and a second side;

    a disk-shaped ring connected to said insulating body and having a plurality of annularly arranged, axially extending slotted portions on said first side, the number of said slotted portions being a multiple of the number of pole pairs of said motor;

    a pair of sidewalls mechanically connected to each of said slotted portions for structurally supporting a plurality of phase windings of the stator winding outside each slotted portion and between said sidewalls of adjacent slotted portions and on a portion of a tubular section of said first side; and

    a slot-shaped opening formed within each of said slotted portions between each pair of sidewalls for receiving one of a plurality of teeth of said external magnetic yoke for completing the magnetic circuit of the stator, the second side of said insulating body further including a plurality of openings communicating with a plurality of vertically directed slots and a plurality of bridges in said disk-shaped ring for providing a distribution path for said phase windings.

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