High Performance 100 kW Axial Flux PMSM: Validation of the 9S/8P Configuration for Advanced Electric Drive Systems
Siti Nabilah ABDULLAH, Mohd Saufi AHMAD, Choo Jun TAN, Dahaman ISHAK, Qian Yee ANG, Chung Peng LIEW, Tow Leong TIANG
Abstract. The research presents an intensive electromagnetic evaluation of a single stator double rotor (SSDR) axial flux permanent magnet (AFPM) machine, directly addressing the need for high power density solutions. The study investigates the 9s/8p fractional slot concentrated winding configuration, proving the viability of this SSDR unique topology. An advanced 3D Finite Element Analysis (FEA) technique models the machine and verifies performance under both open circuit and on load operation. The three main key findings are validating the high winding factor utilization, ensuring the SSDR configuration is effective to manage high current densities for steady state operation, and demonstrating a minimal torque fluctuation over one cycle. Thus, this analysis conclusively proves that the design of the SSDR machine has robust electromagnetic integrity and high reliability. Hence, the combination of 9s/8p of the AFPM machine is one of the prime candidates for next generation electric drive systems.
Keywords
Axial Flux, Permanent Magnet Synchronous Machine, Finite Element, Single Stator Double Rotor, Fractional Slot
Published online 4/25/2026, 8 pages
Copyright © 2026 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: Siti Nabilah ABDULLAH, Mohd Saufi AHMAD, Choo Jun TAN, Dahaman ISHAK, Qian Yee ANG, Chung Peng LIEW, Tow Leong TIANG, High Performance 100 kW Axial Flux PMSM: Validation of the 9S/8P Configuration for Advanced Electric Drive Systems, Materials Research Proceedings, Vol. 64, pp 291-298, 2026
DOI: https://doi.org/10.21741/9781644904091-36
The article was published as article 36 of the book Energy Futures
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
References
[1] L. Shao, R. Navaratne, M. Popescu, and G. Liu, “Design and Construction of Axial-Flux Permanent Magnet Motors for Electric Propulsion Applications-A Review,” IEEE Access. 2021. https://doi.org/10.1109/ACCESS.2021.3131000
[2] J. Zhao, X. Liu, S. Wang, and L. Zheng, “Review of Design and Control Optimization of Axial Flux PMSM in Renewable-energy Applications,” Chinese Journal of Mechanical Engineering (English Edition). 2023. https://doi.org/10.1186/s10033-023-00868-8
[3] Z. Hao, Y. Ma, P. Wang, G. Luo, and Y. Chen, “A Review of Axial-Flux Permanent-Magnet Motors: Topological Structures, Design, Optimization and Control Techniques,” Machines. 2022. https://doi.org/10.3390/machines10121178
[4] S. W. Song, S. H. Lee, and W. H. Kim, “Design and Analysis of Consequent Pole Axial Flux Motors for Reduced Torque Ripple and Magnet Consumption,” Processes, vol. 13, no. 7, pp. 1-15, 2025. https://doi.org/10.3390/pr13072139
[5] S. Ravindran, P. Koothu Kesavan, D. Banjerdpongchai, and P. Prem, “Modelling, implementation and analysis of double-side slotted axial flux PMGs suitable to small-scale wind energy conversion systems,” Sci. Rep., vol. 15, no. 1, pp. 1-20, 2025. https://doi.org/10.1038/s41598-025-08716-6
[6] I. A. Rudden, G. J. Li, Z. Q. Zhu, A. Duke, and R. Clark, “Fractional-Slot Concentrated Windings for Offshore Wind Turbine Generators: Opportunities and Challenges,” IEEE Access, vol. 12, no. September, pp. 158766-158787, 2024. https://doi.org/10.1109/ACCESS.2024.3486000
[7] S. Y. Kim, “A study on motor characteristics based on pole-slot combinations,” AIP Adv., vol. 14, no. 1, pp. 10-15, 2024. https://doi.org/10.1063/9.0000647
[8] X. Sun, Z. Q. Zhu, S. Cai, L. Wang, F. R. Wei, and B. Shao, “Influence of Stator Slot and Rotor Pole Number Combination on Field Winding Induced Voltage Ripple in Hybrid Excitation Switched Flux Machine,” IEEE Trans. Energy Convers., vol. 36, no. 2, pp. 1245-1261, 2021. https://doi.org/10.1109/TEC.2020.3035258
[9] A. M. EL-Refaie, “Fractional-slot concentrated-windings synchronous permanent magnet machines: Opportunities and challenges,” IEEE Trans. Ind. Electron., vol. 57, no. 1, pp. 107-121, 2010. https://doi.org/10.1109/TIE.2009.2030211
[10] D. Quan et al., “The Design, Analysis, and Verification of an Axial Flux Permanent Magnet Motor with High Torque Density,” Appl. Sci., vol. 15, no. 6, 2025. https://doi.org/10.3390/app15063327
[11] J. F. Zhao, X. Y. Liu, S. Wang, and L. X. Zheng, “Review of Design and Control Optimization of Axial Flux PMSM in Renewable-energy Applications,” CHINESE J. Mech. Eng., vol. 36, no. 1, 2023. https://doi.org/10.1186/s10033-023-00868-8
[12] S. Sarıdağ and M. Eker, “Design of Double-Stator Axial Flux Permanent Magnet Synchronous Motor,” J. New Results Eng. Nat. Sci., vol. 2024, no. 21, pp. 30-46, 2024.
[13] O. Shariati, A. Behnamfar, and B. Potter, “An Integrated Elitist Approach to the Design of Axial Flux Permanent Magnet Synchronous Wind Generators (AFPMWG),” Energies, 2022. https://doi.org/10.3390/en15093262
[14] S. Kahourzade, A. Mahmoudi, H. W. Ping, and M. N. Uddin, “A comprehensive review of axial-flux permanent-magnet machines,” Canadian Journal of Electrical and Computer Engineering. 2014. https://doi.org/10.1109/CJECE.2014.2309322
[15] R. Pormoozeh-Noveiry and M. Niaboli-Guilani, “Optimizing the Efficiency of a Three Phase Axial Flux Synchronous Generator for Use in Direct-Drive Wind Turbines and Modeling by 3D Finite Element Method,” in 2023 5th International Conference on Optimizing Electrical Energy Consumption, OEEC 2023, 2023. https://doi.org/10.1109/OEEC58272.2023.10135483
