Analysis and Improvement of a Hybrid Permanent-Magnet Memory Motor

This paper proposes a hybrid permanent-magnet memory motor. Using finite element method, the utility of AlNiCo and ferrite as low-coercive-force (LCF) magnets in the motor is comparatively analyzed. The results demonstrate that the positive magnetization of the ferrite magnets is difficult, while th...

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Published in:	IEEE transactions on energy conversion Vol. 31; no. 3; pp. 915 - 923
Main Authors:	Zhou, Yubin, Chen, Yangsheng, Shen, Jian-Xin
Format:	Journal Article
Language:	English
Published:	New York IEEE 01.09.2016 The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:	AlNiCo magnets Computer simulation Demagnetization Ferrite ferrite magnets Ferrites Low cycle fatigue magnetic barrier Magnetic flux Magnetism Magnetization Magnets memory motor Motors Permanent magnet motors Permanent magnets re-magnetization Rotors Saturation magnetization Synchronous motors
ISSN:	0885-8969, 1558-0059
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Abstract	This paper proposes a hybrid permanent-magnet memory motor. Using finite element method, the utility of AlNiCo and ferrite as low-coercive-force (LCF) magnets in the motor is comparatively analyzed. The results demonstrate that the positive magnetization of the ferrite magnets is difficult, while the field-variation range with the AlNiCo magnets is not sufficient, and the motor-power density and the positive magnetization characteristic of the LCF magnets cannot be improved simultaneously. On the other hand, the q-axis current may cause irreversible demagnetization in the LCF magnets, especially in the AlNiCo magnets. To solve the problems, an improved rotor topology with magnetic barriers is designed and considering that the demagnetization curve of ferrite magnets is mostly linear, ferrite magnets are used as the LCF magnets in the improved motor. Performance of the improved motor is analyzed and compared with that of the original configuration. Simulation results show that the positive magnetization characteristic of the ferrite magnets is significantly improved and the irreversible demagnetization in the ferrite magnets is avoided under load conditions. A prototype is fabricated and tested, verifying the analysis results.
AbstractList	This paper proposes a hybrid permanent-magnet memory motor. Using finite element method, the utility of AlNiCo and ferrite as low-coercive-force (LCF) magnets in the motor is comparatively analyzed. The results demonstrate that the positive magnetization of the ferrite magnets is difficult, while the field-variation range with the AlNiCo magnets is not sufficient, and the motor-power density and the positive magnetization characteristic of the LCF magnets cannot be improved simultaneously. On the other hand, the q-axis current may cause irreversible demagnetization in the LCF magnets, especially in the AlNiCo magnets. To solve the problems, an improved rotor topology with magnetic barriers is designed and considering that the demagnetization curve of ferrite magnets is mostly linear, ferrite magnets are used as the LCF magnets in the improved motor. Performance of the improved motor is analyzed and compared with that of the original configuration. Simulation results show that the positive magnetization characteristic of the ferrite magnets is significantly improved and the irreversible demagnetization in the ferrite magnets is avoided under load conditions. A prototype is fabricated and tested, verifying the analysis results.
Author	Yangsheng Chen Jian-Xin Shen Yubin Zhou
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SubjectTerms	AlNiCo magnets Computer simulation Demagnetization Ferrite ferrite magnets Ferrites Low cycle fatigue magnetic barrier Magnetic flux Magnetism Magnetization Magnets memory motor Motors Permanent magnet motors Permanent magnets re-magnetization Rotors Saturation magnetization Synchronous motors
Title	Analysis and Improvement of a Hybrid Permanent-Magnet Memory Motor
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