Mathematical Modeling and Optimal Design for HRE-Free Permanent-Magnet-Assisted Synchronous Reluctance Machine Considering Electro-Mechanical Characteristics

Yeon-Tae Choi, Su-Min Kim, Soo-Jin Lee, Jun-Ho Jang, Seong-Won Kim, Jun-Beom Park, Yeon-Su Kim, Dae-Hyun Lee, Jang-Young Choi () and Kyung-Hun Shin ()
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Yeon-Tae Choi: Department of Electrical Engineering, Chungnam National University, Daejeon 34134, Republic of Korea
Su-Min Kim: Department of Electrical Engineering, Chungnam National University, Daejeon 34134, Republic of Korea
Soo-Jin Lee: Department of Electrical Engineering, Chungnam National University, Daejeon 34134, Republic of Korea
Jun-Ho Jang: Department of Electrical Engineering, Chungnam National University, Daejeon 34134, Republic of Korea
Seong-Won Kim: Department of Electrical Engineering, Chungnam National University, Daejeon 34134, Republic of Korea
Jun-Beom Park: Department of Electrical Engineering, Chungnam National University, Daejeon 34134, Republic of Korea
Yeon-Su Kim: Department of Electrical Engineering, Chungnam National University, Daejeon 34134, Republic of Korea
Dae-Hyun Lee: Department of Bio-Systems Machinery Engineering, Chungnam National University, Daejeon 34134, Republic of Korea
Jang-Young Choi: Department of Electrical Engineering, Chungnam National University, Daejeon 34134, Republic of Korea
Kyung-Hun Shin: Department of Electrical Engineering, Changwon National University, Changwon 51140, Republic of Korea

Mathematics, 2025, vol. 13, issue 17, 1-24

Abstract: This paper presents the design of a permanent-magnet-assisted synchronous reluctance motor (PMa-SynRM) for compressor applications using Sm-series injection-molded magnets that eliminate heavy rare-earth elements. The high shape flexibility of the injection-molded magnets enables the formation of a curved multi-layer flux-barrier rotor geometry based on the Joukowski airfoil potential, optimizing magnetic flux flow under typical compressor operating conditions. Furthermore, electromagnetic performance, irreversible demagnetization behavior, and rotor stress sensitivity were analyzed with respect to key design variables to derive a model that satisfies the target performance requirements. The validity of the proposed design was confirmed through finite element method (FEM) comparisons with a conventional IPMSM using sintered NdFeB magnets, demonstrating the feasibility of HRE-free PMa-SynRM for high-performance compressor drives.

Keywords: injection-molded magnets; irreversible demagnetization; Joukowski airfoil potential formula; permanent-magnet-assisted synchronous reluctance motor; rotor stress; finite element method (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2025
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