Simplified Sensorless Rotor Temperature Estimation of Interior Permanent Magnet Synchronous Motor

Martin Ganchev (Speaker), Christian Kral, Thomas Wolbank

Research output: Chapter in Book or Conference ProceedingsConference Proceedings with Oral Presentation


Reversible demagnetization effects due to temperature increase is a common problem in rare-earth magnets widely used in Interior Permanent Magnets Synchronous Machines (IPMSM). Variation of the magnetization level of the magnets leads to different saturation levels in the steel stator core of the machine. The paper proposes a simple method to detect magnetization variation by an intermittent injection of a voltage pulse in the d-axis of the motor, while q-current is kept zero. The slope of the resulted dcurrent response reflects a given saturation level which is distinctive for a given magnet temperature. Since this is a strongly non-linear relationship, a look-up-table (LUT) for the motor is required. The paper proposes a procedure where the identification of the LUT without measuring directly the rotor temperature can be achieved at standstill.
Original languageGerman
Title of host publicationProceedings of SPEEDAM 2012
Number of pages5
Publication statusPublished - 2012
EventIeee Speedam 2012 -
Duration: 20 Jun 201222 Jun 2012


ConferenceIeee Speedam 2012

Research Field

  • Not defined


  • magnet temperature
  • rotor temperature
  • permanent-magnet synchronous motor
  • saturation effects
  • voltage pulse injection

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