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

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 ef...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2018-07, Vol.54 (4), p.3338-3349
Main Authors: Reigosa, David, Fernandez, Daniel, Park, Yonghyun, Diez, Alberto B., Lee, Sang Bin, Briz, Fernando
Format: Article
Language:English
Subjects:
Back electromotive force
Demagnetization
Hall effect
Hall-effect sensors
Magnetic field measurement
Magnetic flux
Magnetic sensors
Magnetism
Magnetization
magnetization state estimation
Motors
Performance degradation
permanent magnet synchronous machines (PMSMs)
Permanent magnets
Reliability
Sensors
Signal injection
Spectrum analysis
Stators
Synchronous machines
Thermal stress
Torque
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Summary: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.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2018.2810123