Permanent Magnet Synchronous Machine Non-Uniform Demagnetization Detection Using Zero-Sequence Magnetic Field Density

David Reigosa, Daniel Fernandez, Maria Martinez, Yonghyun Park, Sang Bin Lee, Fernando Briz

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Demagnetization in permanent magnet synchronous machines results in a decrease in the motor average torque and could also increase the torque ripple and consequently vibration and acoustic noise, degrading the overall performance and reliability of the drive. Demagnetization detection can be therefore of tremendous importance. Use of Hall-effect sensors has proven to be a viable option for demagnetization detection. Results reported using this method were based on the analysis of the flux density complex vector; the accuracy of this implementation strongly depends on the angle of the Hall-effect sensor, being also sensitive to implementation issues such as offsets and gain variations of the sensors, magnet temperature, manufacturing tolerances, and stator current injection. This paper proposes the use of the zero-sequence component of the magnetic flux density for demagnetization detection. The use of this signal will improve the accuracy and reduce the sensitivity to implementation issues compared to the use of the flux complex vector.

Original languageEnglish
Article number8705316
Pages (from-to)3823-3833
Number of pages11
JournalIEEE Transactions on Industry Applications
Issue number4
Publication statusPublished - 2019 Jul 1

Bibliographical note

Funding Information:
Dr. Fernández was the recipient of a Fellowship for the Personnel Research Training Program funded by the Regional Ministry of Education and Science of the Principality of Asturias in 2013 and he was the recipient of four IEEE Industry Applications Society Conference Prize Paper Awards.

Funding Information:
Manuscript received October 5, 2018; revised December 24, 2018 and February 25, 2019; accepted April 30, 2019. Date of publication May 2, 2019; date of current version June 29, 2019. Paper 2018-IDC-1023.R2, presented at the 2018 IEEE Energy Conversion Congress and Exposition, Portland, OR, USA, Sep. 23–27, and approved for publication in the IEEE TRANSACTIONS ON IN-DUSTRY APPLICATIONS by the Industrial Drives Committee of the IEEE Industry Applications Society. This work was supported in part by the Research, Technological Development, and Innovation of the Spanish Ministry Economy and Competitiveness, under Grant MINECO-17-ENE2016-80047-R, in part by the Economic Development Agency of the Principality of Asturias (IDEPA) and ThyssenKrupp under Grant SV-PA-17-RIS3-2, and in part by the Government of Asturias under project IDI/2018/000188 and FEDER funds. (Corresponding author: Sang Bin Lee.) D. Reigosa, D. Fernández, M. Martínez, and F. Briz are with the Department of Electrical, Computer and System Engineering, University of Oviedo, Gijón 33204, Spain (e-mail:; fernandezalodaniel@;;

Publisher Copyright:
© 1972-2012 IEEE.


  • Hall-effect sensors
  • non-uniform demagnetization
  • 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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