4.8 Article

Hysteresis Loss in NdFeB Permanent Magnets in a Permanent Magnet Synchronous Machine

期刊

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
卷 69, 期 1, 页码 121-129

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2021.3050358

关键词

Magnetic hysteresis; Magnetic field measurement; Loss measurement; Coercive force; Superconducting magnets; Magnetometers; Magnetic flux; Electric machines; loss measurement; magnetic field measurement; magnetic hysteresis; magnetic losses; magnetic materials; neodymium magnets; permanent magnet (PM) machines; permanent magnets (PM)

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This study assesses the hysteresis behavior of two NdFeB PM grades with different magnetic properties in a PMSM. The results indicate that hysteresis loss resulting from structural imperfections and magnet geometry may introduce considerable loss in NdFeB PMs applied in rotating electrical machines.
Most permanent magnet (PM) loss studies consider only eddy current loss and neglect hysteresis. In this article, the hysteresis behavior of two NdFeB PM grades with different magnetic properties is assessed when applied in a PMSM. Data from vibrating sample magnetometer measurements and hysteresis modeling are used as a base. In addition to the main magnetic phase, the samples contained magnetic phases with reduced coercivity. Such phases may contribute to hysteresis losses in a PM material. A new model is introduced to simulate the hysteresis of rare-earth magnets of any geometric shape in the second and first quadrants of the intrinsic BH-plane. The magnetic field strength distribution in the PM material of an electrical motor is analyzed by two-dimensional finite-element method. The results are used as the input data for an analytical hysteresis model. The results indicate that the hysteresis loss resulting from the structural imperfections and geometry of the magnet may introduce a considerable loss in NdFeB PMs applied in rotating electrical machines.

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