高轉速低扭矩之馬達相較於其他功率相同的馬達，通常擁有較佳的體積功率密度，並且在性能的表現上，除了可以應用於高速場合，亦可以搭配減速機構使整體應用於高扭矩場合，其應用領域相當廣泛。但在設計的考量上，此類馬達需要考慮轉子結構強度以及高頻的電磁損失帶來的影響，因前者可能於高速下發生磁鐵飛脫的情形，後者則可能導致馬達溫度上升，並間接增加磁鐵退磁風險。本研究以磁通切換式永磁馬達(FSPM)為基礎，利用其磁鐵是設置於定子上以及轉子僅由單一材料所構成的特性，降低退磁與結構崩解的風險。然而，以低定子槽數、低轉子極數的單定子FSPM而言，往往需要在諧波與不平衡徑向力的兩個問題中作取捨，否則會付出更大的損失在馬達性能與驅動器成本上。因此本研究延伸至雙定子構型以有效降低這些問題。在實作方面，本研究結合自黏貼矽鋼片製程實現混合式堆疊定子構型以提升組裝精度，同時搭配3D列印技術提出降低風損之轉子設計，最終建立一套設計流程，並利用有限元素軟體分析其電磁場、結構強度與流體特性，並將此原型機進行實際量測以驗證其可行性。

Under the condition of the same output power, a high-speed low-torque motor has a better volumetric power density than a general motor. In addition, high-speed motors can be used in not only high-speed applications, but also in high-torque applications with reduction ratios. In terms of high-speed motor design, it is essential to take structural strength of the rotor and high-frequency electromagnetic loss into considerations. The former ensures the robustness of the rotor and prevents collapse caused by high-speed centrifugal force; the latter secures magnets from demagnetization resulted from high-frequency eddy current losses. This research is based on the design of a flux-switching permanent magnet motor (FSPM) to improve the structural strength of high-speed motors and reduce the risk of demagnetization. The magnet of FSPM is placed on the stator, and the rotor is composed of only one material. At the same time, this research is also extended to the dual stator configurations to solve the problem of harmonics and unbalanced radial forces. Then use finite element software to analyze the electromagnetic field, structural strength and flow field. Finally, the feasibility of the proposed design is verified by a dynamometer.

[1] Data Bridge Market Research Private Ltd, "Global Power Tools Market – Industry Trends and Forecast to 2027 "
[2] Z. Q. Zhu and J. T. Chen, "Advanced Flux-Switching Permanent Magnet Brushless Machines," in IEEE Transactions on Magnetics, vol. 46, no. 6, pp. 1447-1453, June 2010.
[3] J. T. Chen and Z. Q. Zhu, "Winding Configurations and Optimal Stator and Rotor Pole Combination of Flux-Switching PM Brushless AC Machines," in IEEE Transactions on Energy Conversion, vol. 25, no. 2, pp. 293-302, June 2010.
[4] J.T. Chen and Z.Q. Zhu, "Comparison of all and alternate poles wound flux-switching PM machines having different stator and rotor pole numbers," IEEE Trans. Industry Applications, vol.46, no.4, pp.1406-1415, 2010
[5] D. Bobba, Y. Li and B. Sarlioglu, "Harmonic Analysis of Low-Stator-Slot and Rotor-Pole Combination FSPM Machine Topology for High Speed," in IEEE Transactions on Magnetics, vol. 51, no. 11, pp. 1-4, Nov. 2015.
[6] D. Bobba, G. Bramerdorfer, Y. Li, T. A. Burress and B. Sarlioglu, "Stator tooth and rotor pole shaping for low pole flux switching permanent magnet machines to reduce even order harmonics in flux linkage," 2016 IEEE Energy Conversion Congress and Exposition (ECCE), 2016, pp. 1-8.
[7] Y. Li, D. Bobba, and B. Sarlioglu, "A novel dual-stator flux-switching permanent-magnet machine with six-stator-slots and four-rotor-poles configuration," in Proc. IEEE International Electric Machines and Drives Conference (IEMDC), Coeur d’Alène, 2015.
[8] Y. Li, D. Bobba and B. Sarlioglu, "A Novel 6/4 Flux-Switching Permanent Magnet Machine Designed for High-Speed Operations," in IEEE Transactions on Magnetics, vol. 52, no. 8, pp. 1-9, Aug. 2016.
[9] Y. Li, D. Bobba and B. Sarlioglu, "Design and Performance Characterization of a Novel Low-Pole Dual-Stator Flux-Switching Permanent Magnet Machine for Traction Application," in IEEE Transactions on Industry Applications, vol. 52, no. 5, pp. 4304-4314, Sept.-Oct. 2016.
[10] D. Bobba, Y. Li and B. Sarlioglu, "Design optimization for reducing harmonic distortion of flux linkage in low pole flux-switching permanent magnet machines," 2016 IEEE Transportation Electrification Conference and Expo (ITEC), 2016, pp. 1-6.
[11] Y. Li, J. H. Kim, R. Leuzzi, M. Liu and B. Sarlioglu, "Novel 6-slot 4-pole dual-stator flux-switching permanent magnet machine comparison studies for high-speed applications," 2016 IEEE Energy Conversion Congress and Exposition (ECCE), 2016, pp. 1-8.
[12] M. Liu, Y. Li and B. Sarlioglu, "Thermal analysis of a novel dual-stator 6/4 flux-switching permanent magnet machine," 2017 IEEE Power & Energy Society General Meeting, 2017, pp. 1-5.
[13] P. C. Palavicino, M. Liu, D. Bobba and B. Sarlioglu, "Analysis of dual-stator 6/4 FSPM and IPM machines under internal short circuits," 2017 IEEE Southern Power Electronics Conference (SPEC), 2017, pp. 1-6.
[14] P. C. Palavicino, D. Bobba, Mingda Liu and B. Sarlioglu, "Fast Computation Method To Obtain Typical Machine Waveforms Applied to a 6/4 FSPM Machine," 2018 IEEE Transportation Electrification Conference and Expo (ITEC), 2018, pp. 809-814.
[15] M. Liu, Y. Li, W. Sixel and B. Sarlioglu, "Design and Testing of Low Pole Dual-Stator Flux-Switching Permanent Magnet Machine for Electric Vehicle Applications," in IEEE Transactions on Vehicular Technology, vol. 69, no. 2, pp. 1464-1472, Feb. 2020.
[16] M. Liu, W. Sixel, H. Ding and B. Sarlioglu, "Investigation of Rotor Structure Influence on the Windage Loss and Efficiency of FSPM Machine," 2018 IEEE Energy Conversion Congress and Exposition (ECCE), 2018, pp. 6499-6505.
[17] 朝程工業股份有限公司，https://www.techway.com.tw/
[18] Z. Q. Zhu and J. T. Chen, "Advanced Flux-Switching Permanent Magnet Brushless Machines," in IEEE Transactions on Magnetics, vol. 46, no. 6, pp. 1447-1453, June 2010.
[19] E. Hoang, H. B. Ahmed, J. Lucidarme, "Switching flux permanentmagnet polyphased synchronous machines,"1997 European Conference on Power Electronics and Applications (EPE'97), Trondheim, Norway, 1997.
[20] 吳昇澤, "基於3D列印之創新型永磁馬達與扇葉一體式設計",國立成功大學電機工程學系電機設計與驅動產業碩士專班論文，2019年。
[21] Z. Q. Zhu, Y. Pang, D. Howe, S. Iwasaki, R. Deodhar and A. Pride, "Analysis of electromagnetic performance of flux-switching permanent-magnet Machines by nonlinear adaptive lumped parameter magnetic circuit model," in IEEE Transactions on Magnetics, vol. 41, no. 11, pp. 4277-4287, Nov. 2005.
[22] W. Hua, M. Cheng, Z. Q. Zhu and D. Howe, "Analysis and Optimization of Back EMF Waveform of a Flux-Switching Permanent Magnet Motor," in IEEE Transactions on Energy Conversion, vol. 23, no. 3, pp. 727-733, Sept. 2008.
[23] W. Hua, M. Cheng, Z. Q. Zhu and D. Howe, "Analysis and Optimization of Back-EMF Waveform of a Novel Flux-Switching Permanent Magnet Motor," 2007 IEEE International Electric Machines & Drives Conference, 2007, pp. 1025-1030.
[24] L. Hao, M. Lin, X. Zhao and H. Luo, "Analysis and optimization of EMF waveform of a novel axial field flux-switching permanent magnet machine," 2011 International Conference on Electrical Machines and Systems, 2011, pp. 1-6.
[25] JMAG磁性材料資料庫，https://www.jmag-international.com/
[26] C. Gan, J. Wu, M. Shen, W. Kong, Y. Hu and W. Cao, "Investigation of Short Permanent Magnet and Stator Flux Bridge Effects on Cogging Torque Mitigation in FSPM Machines," in IEEE Transactions on Energy Conversion, vol. 33, no. 2, pp. 845-855, June 2018.