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System and method for permanent magnet motor control

  • US 10,075,116 B2
  • Filed: 04/24/2017
  • Issued: 09/11/2018
  • Est. Priority Date: 04/26/2012
  • Status: Active Grant
First Claim
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1. A method of operating an electric motor, the method comprising:

  • starting the electric motor in an open loop control mode;

    using an estimator module, estimating derivatives with respect to time of total flux linkages of the electric motor based on at least one measured parameter of the electric motor;

    while the electric motor is in the open loop control mode, evaluating the derivatives of the total flux linkages estimated by the estimator module;

    in response to the evaluation of the derivatives of the total flux linkages, determining whether the estimator module has converged; and

    in response to a determination that the estimator module has not converged within a predetermined period of time after starting the electric motor, signaling a first fault condition and at least one of;

    (i) shutting down the electric motor; and

    (ii) restarting the electric motor.

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