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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Vydáno v:IEEE transactions on energy conversion Ročník 31; číslo 3; s. 915 - 923
Hlavní autoři: Zhou, Yubin, Chen, Yangsheng, Shen, Jian-Xin
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York IEEE 01.09.2016
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:
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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Shrnutí: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.
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ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2015.2507262