Rare earth magnets resisting eddy currents

Pan, Wei; Li, W.; Cui, Lun; Li, X.M.; Guo, Zhi-jun

doi:10.1109/20.800519

Cited by 16 publications

(5 citation statements)

References 2 publications

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“…As the Nd-Fe-B-type magnet is essentially metallic, a marked enhancement of electrical resistivity in the metallic magnet is not straightforward as it would first think. Many previous efforts for enhancing the electrical resistivity in the Nd-Fe-B-type magnet have been reported [49,50,[53][54][55][56][57][58][59][60][61][62][63][64][65][66]. Komuro et al [35] prepared hot-pressed Nd-Fe-B-type magnet with high electrical resistivity using anisotropic HDDR-treated Nd-Fe-B-type powder coated with dielectric rare-earth fluorides.…”

Section: Die-upset Magnetmentioning

confidence: 99%

Prospect of developing Nd–Fe–B-type magnet with high electrical resistivity

Kwon

Kang

2019

Rare Met.

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Nd-Fe-B-type magnet is exclusively used as a rotor magnet in the traction motor of hybrid electric vehicle (HEV) and electric vehicle (EV), but its overly high operating temperature is a lingering problem attached to the magnet. The major cause of the high operating temperature is eddy current, which is readily generated in the highly conductive metallic magnet under alternating magnetic field from stator ripple. In this article, temperature rise in the Nd-Fe-B-type magnet with varying electrical resistivity under alternating magnetic field is discussed with the intention of highlighting the importance of enhancing the electrical resistivity for reducing the operating temperature of the Nd-Fe-B-type rotor magnet. Temperature rise in the Nd-Fe-B-type magnet (dielectric salt-added die-upset magnet) with high electrical resistivity is noticeably lower compared to the magnet (commercial sintered rotor magnet) with lower electrical resistivity, substantiating the theory that enhancing the electrical resistivity in the rotor magnet is fairly effective for suppressing the over-rise of its operating temperature during operation. Die-upset process is revealed to be particularly pertinent for the fabrication of highly dense salt-added magnet with high electrical resistivity.

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Section: Die-upset Magnetmentioning

confidence: 99%

Prospect of developing Nd–Fe–B-type magnet with high electrical resistivity

Kwon

Kang

2019

Rare Met.

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“…However, in this case, the magnet sacrifices a great deal of its magnetic prop-erties, and the operating temperature of the magnet is limited by the melting point of the insulating material. [5,9] Doping with high-resistivity oxides is another way to enhance the resistivity. According to a report by Yi, [10] high resistivity (1000 µΩ • cm) was achieved by doping B 2 O 3 into SmCo magnets, but the remanence was only 5.85 kGs.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties and resistivity of a 2:17-type SmCo magnet doped with ZrO₂ *

Yang¹,

Liu²,

Zhang³

et al. 2021

Chinese Phys. B

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In order to counteract the demagnetization caused by eddy current loss, widespread attention has been devoted to increasing the resistivity of permanent magnets. We prepared 2:17-type SmCo magnets doped with different ZrO2 contents and investigated the influence of the ZrO2 content on the magnetic properties and resistive anisotropism. The results showed that not only was the resistivity of the magnet improved, but, in addition, the coercivity of the magnet was significantly increased. The microstructure was studied with TEM, which showed that ZrO2 doping was able to cause a decrease in the lamellar phase density and the growth of cellular structures. The increased grain boundaries and Sm2O3 phases were favorable to the improvement of resistivity. The decrease of the lamellar phases caused a narrowing of the resistive anisotropism. The additional Cu in the center of the cellular boundaries was the main reason for the enhancement of H cj. However, an excessive amount caused an increase of the Zr6(FeCo)23 phase and a deterioration of the cellular structure, thereby leading to a decrease in coercivity.

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“…Meaningfully, the electrical machine efficacy has been enhanced by introducing and utilizing PMs [4]. Thus, in the last 20 years, not only the cost of magnets has decreased, but also various categorizations of magnets became available [5]. This has made it conceivable to utilize PM machines even in industries suchlike the aircraft industry or the military.…”

Section: Introductionmentioning

confidence: 99%

An Improvement on Slot Configuration Structure of a Low-Speed Surface-Mounted Permanent Magnet Synchronous Generator with a Wound Cable Winding

Parivar

Seyyedbarzegar

Darabi

2021

IJE

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Rare earth magnets resisting eddy currents

Cited by 16 publications

References 2 publications

Prospect of developing Nd–Fe–B-type magnet with high electrical resistivity

Prospect of developing Nd–Fe–B-type magnet with high electrical resistivity

Magnetic properties and resistivity of a 2:17-type SmCo magnet doped with ZrO₂ *

An Improvement on Slot Configuration Structure of a Low-Speed Surface-Mounted Permanent Magnet Synchronous Generator with a Wound Cable Winding

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Rare earth magnets resisting eddy currents

Cited by 16 publications

References 2 publications

Prospect of developing Nd–Fe–B-type magnet with high electrical resistivity

Prospect of developing Nd–Fe–B-type magnet with high electrical resistivity

Magnetic properties and resistivity of a 2:17-type SmCo magnet doped with ZrO2 *

An Improvement on Slot Configuration Structure of a Low-Speed Surface-Mounted Permanent Magnet Synchronous Generator with a Wound Cable Winding

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Product

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Magnetic properties and resistivity of a 2:17-type SmCo magnet doped with ZrO₂ *