Rotor design for sensorless position estimation in permanent-magnet machines

Rafal Wrobel, Alan Budden, Daniel Salt, Derrick Holliday, Philip Mellor, Andrei Dinu, Pareminder Sangha, Marc Holme

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


A high-frequency injection sensorless rotor position estimation algorithm is incorporated directly into the finite-element design process to realize a permanent-magnet (PM) machine that is suited to zero- and low-speed sensorless control. The machine design is tightly constrained by an existing stator assembly, only enabling the redesign of the replacement PM rotor, and by the requirement that the manufacture of the resulting machine must be simple while meeting aerospace standards. Experimental results confirm that the resulting machine matches the original performance specification and that it operates under position sensorless control.
Original languageEnglish
Pages (from-to)3815-3824
Number of pages10
JournalIEEE Transactions on Industrial Electronics
Issue number9
Publication statusPublished - Sept 2011


  • saturation
  • soft magnetic materials
  • magnetization
  • rotors
  • permanent magnets
  • permanent magnet machines
  • sensorless control
  • saturation magnetization


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