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Adaptive demagnetization compensation for a motor in an electric or partially electric motor vehicle

  • US 6,591,925 B2
  • Filed: 09/17/2001
  • Issued: 07/15/2003
  • Est. Priority Date: 09/17/2001
  • Status: Active Grant
First Claim
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1. A hybrid electric vehicle comprising:

  • a first motor coupled to wheels of the hybrid electric vehicle;

    a second motor coupled to wheels of the hybrid electric vehicle;

    a first voltage monitor coupled to the first motor to determine a first permanent magnet induced voltage of the first motor;

    a controller that;

    compares the first permanent magnet induced voltage with a first reference voltage that reflects an expected permanent magnet induced voltage for the first motor when a permanent magnet of the first motor is fully magnetized;

    determines a state of magnetism of the permanent magnet of the first motor based on the first permanent magnet induced voltage, the first reference voltage and a predetermined speed at which the first permanent magnet induced voltage is determined;

    makes the first motor inoperable if the state of magnetism of the permanent magnet of the first motor reaches a predetermined threshold; and

    causes wheels of the vehicle to be driven with the second motor after the first motor is made inoperable.

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