Design of position detection strategy of sensorless permanent magnet motors at standstill using transient finite-element analysis

Weinong Fu, Siu Lau Ho, Zheng Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

13 Citations (Scopus)


Sensorless control of permanent magnet (PM) motors at standstill and low speed is very challenging to implement. In this paper, a methodology to design and optimize the position detection strategy of PM motors using transient finite-element analysis (FEA) of magnetic field is presented. It addresses effects arising from both the iron core saturation and the transient characteristics of signals. A combined inductance which is sensitive to the rotor position throughout the complete cycle is proposed for the realization of position detection. The advantage of the proposed novel algorithm is that the rotor's position at low speeds down to standstill can be easily and robustly detected. A two-phase PM motor with salient structure is used to serve as an example to demonstrate the method.
Original languageEnglish
Article number5257028
Pages (from-to)4668-4671
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number10
Publication statusPublished - 1 Oct 2009


  • Electric motor
  • Initial rotor position
  • Low speed
  • Magnetic field
  • Permanent magnet (PM)
  • Sensorless control
  • Standstill

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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