Permanent magnet temperature estimation
AssigneeFord Global Technologies, LLC
InventorsJi Wu, Franco Leonardi, Feng Liang, Michael W. Degner, Daniel Luedtke
Life of this patent
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Abstract
A method of controlling a vehicle including a permanent magnet (PM) synchronous motor is provided. The motor is controlled based on direct-axis (d-axis) and quadrature-axis (q-axis) current commands. The method includes estimating permanent magnet flux linkage based on q-axis voltage and electrical angular speed, and estimating permanent magnet temperature based on permanent magnet flux linkage and the temperature coefficient of the permanent magnet. The vehicle is controlled based on the estimated permanent magnet temperature.
Claims17
A method of controlling a vehicle including a permanent magnet (PM) synchronous motor, the motor being controlled based on direct-axis (d-axis) and quadrature-axis (q-axis) current commands, the method comprising:
- estimating permanent magnet flux linkage based on q-axis voltage and electrical angular speed;
- estimating permanent magnet temperature based on permanent magnet flux linkage and the temperature coefficient of the permanent magnet;
- and
- controlling the vehicle based on the estimated permanent magnet temperature.
A method of controlling a permanent magnet (PM) synchronous motor, the motor being controlled based on direct-axis (d-axis) and quadrature-axis (q-axis) current commands, the method comprising:
- estimating permanent magnet flux linkage based on q-axis voltage and electrical angular speed;
- estimating permanent magnet temperature based on permanent magnet flux linkage and the temperature coefficient of the permanent magnet;
- and
- generating an output signal indicative of the estimated permanent magnet temperature.
An apparatus for controlling a permanent magnet (PM) synchronous motor, the apparatus comprising:
- a motor controller configured to:
- control the motor based on direct-axis (d-axis) and quadrature-axis (q-axis) current commands;
- estimate permanent magnet flux linkage based on q-axis voltage and electrical angular speed;
- estimate permanent magnet temperature based on permanent magnet flux linkage and the temperature coefficient of the permanent magnet;
- and
- generate an output signal indicative of the estimated permanent magnet temperature.
Dependencies are inferred from the claim text.