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

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Bibliographic Details
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]
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Database:	Engineering Source

Description
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]
ISSN:	19378718
DOI:	10.2528/PIERC25123004