# Design Studies on IPMSM with Radially Oriented Arc-Shaped Metal Magnet for Automotive Traction Drives https://mdr.nims.go.jp/datasets/107e91a5-8047-4f35-8a04-6da7514498d7 ## File - [REPM2025_O6-2_Kajiwara.pdf](https://mdr.nims.go.jp/filesets/ccd623dc-1c62-4542-a4cc-464f1bd1dc72/download) ([Detail](https://mdr.nims.go.jp/filesets/ccd623dc-1c62-4542-a4cc-464f1bd1dc72.md)) - [(abstract) O6-2_Figure1.jpeg](https://mdr.nims.go.jp/filesets/06af3ea1-7385-43ec-9b0f-41a360f8fc1e/download) ([Detail](https://mdr.nims.go.jp/filesets/06af3ea1-7385-43ec-9b0f-41a360f8fc1e.md)) ## Id 107e91a5-8047-4f35-8a04-6da7514498d7 ## Local identifier ## Visibility open_to_public ## State published ## Created at 2025-08-13T08:27:16.970415Z ## Updated at 2025-08-20T03:30:52.506357Z ## Published at 2025-08-20T03:19:21.253038Z ## Doi https://doi.org/10.48505/nims.5645 ## First published url ## Date published ## Recorded date published ## Resource type conference_presentation ## Manuscript type na ## Collection - id: d28f086a-61aa-4bc7-bcae-5a1078cbc6c7 identifier: https://mdr.nims.go.jp/pid/d28f086a-61aa-4bc7-bcae-5a1078cbc6c7 title: The 28th International Workshop on Rare Earth and Future Permanent Magnets and Their Applications (REPM2025) ## Title - title: Design Studies on IPMSM with Radially Oriented Arc-Shaped Metal Magnet for Automotive Traction Drives title_type: original lang: en ## Description - description: "In recent years, hybrid vehicles (HEVs) and electric vehicles (EVs) have become increasingly popular due to global warming countermeasures and stricter CO2 emission regulations, and HEV drive motors are required to have high torque at low speed and high efficiency in the low, medium and high-speed ranges. Furthermore, there are growing demands for higher output from improved dynamic performance. To meet these requirements, it is important to optimize the design of an Interior Permanent Magnet Synchronous Motor (IPMSM) that can utilize reluctance torque effectively. However, conventional IPMSMs employ a rotor structure that assumes rectangular sintered rare earth magnets [1]-[4], making it difficult to maximize reluctance torque due to magnet shape constraints.\r\nIn this report, a new rotor structure with radially oriented arc-shaped Nd-Fe-B hotdeformed magnets embedded in arc-shaped multi-layer flux barriers is proposed as a rotor structure suitable for improving reluctance torque. Specifically, a rotor structure with a single-layer V-shape arrangement is used as a reference motor, and a rotor shape with a three-layer arc arrangement is designed to simultaneously achieve a 20% increase in maximum output and high efficiency while maintaining maximum torque. A prototype of the IPMSM was prepared, and the motor performance was evaluated by a dynamometer, achieving improvements of 9.2% in maximum torque and 30.4% in maximum output compared to the reference machine (Fig. 1). As for efficiency, a 0.7% improvement in maximum efficiency and an expansion of the high-efficiency range were confirmed compared to the reference machine, demonstrating the validity of the motor design.\r\nThe results of this research showed the feasibility of high-torque, high-power and highefficiency drive motors and confirmed that radially oriented arc-shaped hot-deformed magnets can contribute to further performance improvement of HEV/EV drive motors.\r\n\r\nReferences\r\n[1] Y. Honda et al, IEEJ Trans. IA, Vol.117, No.10, pp.1221-1226 (1997).\r\n[2] S. Morimoto, Transactions on Electrical and Electronic Engineering, Vol.2, No.2, pp.101-108 (2007).\r\n[3] M. Kamiya, IEEJ Trans. IA, Vol.126, No4, pp.473-479 (2006).\r\n[4] K. Yamazaki et al, The Papers of Technical Meeting, IEEJ, RM-10-69, SPC-10-82, MD-10-14,pp.75-80 (2010)." description_type: abstract lang: en ## Creator - name: Jumpei Hinata role: author organization: Corporate R&D center, Daido Steel Co., Ltd., Japan - name: Takanori Kajiwara role: author organization: Corporate R&D center, Daido Steel Co., Ltd., Japan - name: Takashi Oikawa role: author organization: Corporate R&D center, Daido Steel Co., Ltd., Japan - name: Yoshiaki Kano role: author organization: Dept. of Electrical and Electronics Engineering, Daido University, Japan ## Contact agent ## Publisher organization: National Institute for Materials Science (NIMS) ## Managing organization ## Keyword - subject: REPM2025 schema: not_defined - subject: xEV schema: not_defined - subject: IPMSM schema: not_defined - subject: Nd-Fe-B magnet schema: not_defined - subject: Hot-deformed magnet schema: not_defined - subject: Arc-Shaped magnet schema: not_defined ## Rights - identifier: https://creativecommons.org/licenses/by-nc-nd/4.0/ ## Other identifier(s) ## Data origin - data_origin_type: other ## Embargo ## Journal ## Conference name: REPM2025 start_date: 2025-07-27 end_date: 2025-07-31 identifier: https://www.nims.go.jp/mmu/repm2025/ ## Related item ## Funding ## Instrument ## Instrument operator ## Instrument managing organization ## Measurement method ## Specimen ## Chemical composition ## Structure for specimen ## Structural feature for specimen ## Specific property for specimen ## Process for specimen treatment ## Computational method ## Energy level/transition state ## Software ## Custom property ## Fileset - id: ccd623dc-1c62-4542-a4cc-464f1bd1dc72 filename: REPM2025_O6-2_Kajiwara.pdf content_type: application/pdf size: 1683014 md5: b95bdc7355c0d29ec283f4731dacdc79 - id: 06af3ea1-7385-43ec-9b0f-41a360f8fc1e filename: "(abstract) O6-2_Figure1.jpeg" content_type: image/jpeg size: 140615 md5: 61a2259794990989c6a2c964771a0bff ## Thumbnail fileset_id: ccd623dc-1c62-4542-a4cc-464f1bd1dc72 filename: REPM2025_O6-2_Kajiwara.pdf