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Lower Cost Variable-Leakage-Flux Reverse-Salient-Pole Permanent Magnet Motor by Reducing Rare-Earth Permanent Magnet Usage.

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Title: Lower Cost Variable-Leakage-Flux Reverse-Salient-Pole Permanent Magnet Motor by Reducing Rare-Earth Permanent Magnet Usage.
Authors: Liu, Xiping1, Hu, Hongzhan1, Jia, Qianli1, Liu, Zhangqi1 liuzhq@jxust.edu.cn, Zhu, Zhiguo1
Source: Progress in Electromagnetics Research C. 2026, Vol. 166, p57-67. 11p.
Subjects: Permanent magnet motors, Ferrites, Torque, Finite element method
Abstract: This paper proposes a novel less-rare-earth variable-leakage-flux reverse-salient-pole motor (LRE-VLF-RSPM). The proposed motor achieves the reverse-salient-pole and variable-leakage-flux characteristics by reasonably arranging three layers of arc-shaped flux barriers between adjacent magnetic poles. Furthermore, it incorporates ferrite magnets to reduce the usage of rare-earth permanent magnets by one-third while maintaining torque output, thereby fulfilling the less-rare-earth objective. First, the paper introduces a rotor topology and operational principle. Subsequently, it employs two-dimensional finite element analysis (FEA) to compare the electromagnetic performance -- including torque, flux-weakening capability, constant power speed range (CPSR), and high-efficiency region proportion -- among a conventional V-type synchronous motor (CTVSM), a variable-leakage-flux reverse-salient-pole motor (VLFRSPM), and the LRE-VLF-RSPM. The final results demonstrate that the proposed motor reduces rare-earth usage by one-third compared to the benchmark motor and exhibits superior flux-weakening capability, a wide constant power speed range, and a large high-efficiency region. These findings verify the effectiveness and feasibility of the proposed motor. [ABSTRACT FROM AUTHOR]
Copyright of Progress in Electromagnetics Research C is the property of Electromagnetics Academy and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Lower Cost Variable-Leakage-Flux Reverse-Salient-Pole Permanent Magnet Motor by Reducing Rare-Earth Permanent Magnet Usage.
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  Data: <searchLink fieldCode="AR" term="%22Liu%2C+Xiping%22">Liu, Xiping</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Hu%2C+Hongzhan%22">Hu, Hongzhan</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Jia%2C+Qianli%22">Jia, Qianli</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Liu%2C+Zhangqi%22">Liu, Zhangqi</searchLink><relatesTo>1</relatesTo><i> liuzhq@jxust.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Zhu%2C+Zhiguo%22">Zhu, Zhiguo</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Progress+in+Electromagnetics+Research+C%22">Progress in Electromagnetics Research C</searchLink>. 2026, Vol. 166, p57-67. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Permanent+magnet+motors%22">Permanent magnet motors</searchLink><br /><searchLink fieldCode="DE" term="%22Ferrites%22">Ferrites</searchLink><br /><searchLink fieldCode="DE" term="%22Torque%22">Torque</searchLink><br /><searchLink fieldCode="DE" term="%22Finite+element+method%22">Finite element method</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This paper proposes a novel less-rare-earth variable-leakage-flux reverse-salient-pole motor (LRE-VLF-RSPM). The proposed motor achieves the reverse-salient-pole and variable-leakage-flux characteristics by reasonably arranging three layers of arc-shaped flux barriers between adjacent magnetic poles. Furthermore, it incorporates ferrite magnets to reduce the usage of rare-earth permanent magnets by one-third while maintaining torque output, thereby fulfilling the less-rare-earth objective. First, the paper introduces a rotor topology and operational principle. Subsequently, it employs two-dimensional finite element analysis (FEA) to compare the electromagnetic performance -- including torque, flux-weakening capability, constant power speed range (CPSR), and high-efficiency region proportion -- among a conventional V-type synchronous motor (CTVSM), a variable-leakage-flux reverse-salient-pole motor (VLFRSPM), and the LRE-VLF-RSPM. The final results demonstrate that the proposed motor reduces rare-earth usage by one-third compared to the benchmark motor and exhibits superior flux-weakening capability, a wide constant power speed range, and a large high-efficiency region. These findings verify the effectiveness and feasibility of the proposed motor. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Progress in Electromagnetics Research C is the property of Electromagnetics Academy and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.2528/PIERC25123004
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 11
        StartPage: 57
    Subjects:
      – SubjectFull: Permanent magnet motors
        Type: general
      – SubjectFull: Ferrites
        Type: general
      – SubjectFull: Torque
        Type: general
      – SubjectFull: Finite element method
        Type: general
    Titles:
      – TitleFull: Lower Cost Variable-Leakage-Flux Reverse-Salient-Pole Permanent Magnet Motor by Reducing Rare-Earth Permanent Magnet Usage.
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            NameFull: Liu, Xiping
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            NameFull: Hu, Hongzhan
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            NameFull: Jia, Qianli
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            NameFull: Liu, Zhangqi
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            NameFull: Zhu, Zhiguo
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            – D: 01
              M: 04
              Text: 2026
              Type: published
              Y: 2026
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              Value: 166
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            – TitleFull: Progress in Electromagnetics Research C
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