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Multi-phase permanent magnet brushless DC electric motor

  • US 8,604,655 B1
  • Filed: 03/08/2013
  • Issued: 12/10/2013
  • Est. Priority Date: 09/25/2012
  • Status: Active Grant
First Claim
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1. An electric motor, comprising;

  • a rotor comprising a plurality of permanent magnets organized as alternating poles of opposite polarities;

    a stator surrounding the rotor, the stator comprising a plurality of conductors positioned in a respective plurality of slots extending from a first end to a second end of the stator, a first set of conductors electrically connected as a first wye-connected circuit and a second set of conductors electrically connected as a second wye connected circuit, the conductors in the first wye-connected circuit receiving power from terminals at the first end of the stator and the conductors in the second wye-connected circuit receiving power from terminals at the second end of the stator, the conductors positioned in the slots with selected subsets of the conductors in the first set of conductors interleaved with selected subsets of the conductors in the second set of conductors; and

    a drive circuit that provides electrical currents to the conductors of the first and second wye-connected circuits, the drive circuit controlling the direction of flow and the timing of the currents in the conductors such that at any time the conductors of the first and second wye-connected circuits produce a plurality of stator poles, each stator pole produced by currents flowing through equal numbers of conductors in the first wye-connected circuit and conductors in the second wye-connected circuit.

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