The effect of magnetic saturation on sensorless control of a brushless permanent magnet motor under AC and DC excitation

Antonio Griffo, Rafal Wrobel, Philip Mellor, Derrick Holliday, Parminder Sangha, Andrei Dinu, Marc Holme

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

2 Citations (Scopus)


The design and performance of a permanent magnet rotor for a concentrated wound, torque dense machine exhibiting a saliency profile suited to high-frequency injection based zero- and low-speed sensorless control is presented. Rotor design is mechanically constrained by an existing stator. Electromagnetic specifications require the motor to match the torque capability of an existing baseline machine whilst demonstrating a saliency characteristic suited for injection based, low-speed sensorless control. The effects of fundamental current amplitude on flux saturation and saliency profile are investigated for brushless DC and brushless AC operation. The saliency profiles required for sensorless detection show significant differences under these operating modes. For the selected rotor design, brushless AC operation results in a stronger saliency signature at light loads, which quickly deteriorates with the onset of saturation. Brushless DC operation results in more gradual deterioration in saliency signature, suggesting sensorless control would be possible over a greater torque range.
Original languageEnglish
Title of host publication2011 IEEE Energy conversion congress and exposition (ECCE)
Place of PublicationNew York
Number of pages8
ISBN (Print)9781457705427
Publication statusPublished - 2011
EventIEEE Energy Conversion Congress & Exposition (ECCE '11) - Phoenix, United States
Duration: 17 Sep 201122 Sep 2011


ConferenceIEEE Energy Conversion Congress & Exposition (ECCE '11)
CountryUnited States


  • sensorless control
  • permanent magnet machines
  • brushless
  • permanent magnet motor
  • ac
  • dc
  • excitation
  • couplings
  • torque
  • stator windings
  • sensorless control
  • rotors
  • magnetic flux
  • estimation

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