Detection of Demagnetization in Permanent Magnet Synchronous Machines Using Hall-Effect Sensors

David Reigosa, Daniel Fernandez, Yonghyun Park, Alberto B. Diez, Sang Bin Lee, Fernando Briz

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


Torque production capability of permanent magnet synchronous machines (PMSMs) depends on the magnetization state of the permanent magnets (PMs). Electrical stress, thermal stress, or the combined effect of both can produce demagnetization of the PMs, which eventually can result in several adverse effects including decrease in the motor torque and efficiency and increase of the torque ripple and vibration, eventually degrading the performance and reliability of the motor and drive system. A number of approaches have been proposed for detecting PM demagnetization using model-based flux estimation, signal injection, and spectrum analysis of current/back electromotive force; however, all these methods show limitations in terms of invasiveness, implementation cost, and/or reliability of the diagnosis. In this paper, accurate PM demagnetization detection based on measurements from Hall-effect sensors is proposed. Such sensors are often mounted in commercial PMSMs; the proposed method can, therefore, be implemented at practically no cost.

Original languageEnglish
Pages (from-to)3338-3349
Number of pages12
JournalIEEE Transactions on Industry Applications
Issue number4
Publication statusPublished - 2018 Jul 1


  • Demagnetization
  • Hall-effect sensors
  • magnetization state estimation
  • permanent magnet synchronous machines (PMSMs)

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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