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Electric motor stator winding temperature estimation

  • US 7,839,108 B2
  • Filed: 01/24/2008
  • Issued: 11/23/2010
  • Est. Priority Date: 01/24/2008
  • Status: Active Grant
First Claim
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1. A method for controlling a torque command to prevent overheating of one or more of a plurality of phases of a permanent magnet motor, the method comprising the steps of:

  • determining whether a detected speed of the permanent magnet motor is less than a first predetermined speed;

    calculating a copper loss of each of the plurality of phases of the permanent magnet motor in response to an alternating current (AC) root mean square (RMS) current of each of the plurality of phases;

    calculating first thermal impedances for each of the plurality of phases in response to the copper loss of each of the plurality of phases;

    estimating a stator temperature of each of the plurality of phases in response to the first thermal impedances for each of the plurality of phases with respect to a thermal neutral when the detected speed of the permanent magnet motor is less than the first predetermined speed; and

    derating the torque command in response to the stator temperature of one or more of the plurality of phases.

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