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.
Bibliographical noteFunding Information:
Dr. Fernández was a recipient of a fellowship from the Personnel Research Training Program funded by the Regional Ministry of Education and Science of the Principality of Asturias in 2013, and three IEEE Industry Applications Society Conference prize paper awards.
Manuscript received October 26, 2017; revised February 22, 2018; accepted February 23, 2018. Date of publication February 27, 2018; date of current version July 17, 2018. Paper 2017-IDC-1326.R1, presented at the 2017 IEEE Energy Conversion Congress and Exposition, Cincinnati, OH, USA, Oct. 1– 5, and approved for publication in the IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS by the Industrial Drives Committee of the IEEE Industry Applications Society. This work was supported in part by the Spanish Ministry of Education, Culture, and Sports through the José Castillejo Program under Grant PX15/00354; in part by the Regional Ministry of Education, Culture, and Sports of the Principality of Asturias through the Severo Ochoa Program under Grant BP-13067; and in part by the Research, Technological Development, and Innovation Programs of the Spanish Ministry Economy and Competitiveness under Grant MINECO-17-ENE2016-80047-R. (Corresponding author: Sang Bin Lee.) D. Reigosa, D. Fernández, A. B. Diez, and F. Briz are with the Department of Electric Computer and System Engineering, University of Oviedo, Gijón 33204, Spain (e-mail: firstname.lastname@example.org; email@example.com; firstname.lastname@example.org; email@example.com).
Spanish Ministry Economy and Competitiveness under Grant MINECO-17-ENE2016-80047-R.
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- 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