Material Synergy and Efficiency Enhancement in Axial Flux ‎PMSM: Influence of Magnet, Core and Conductor ‎Combinations

  • Authors

    • Sandhiya Swaminathan SRM Institute of Science and Technology, Ramapuram, Chennai, India
    • Saravanan Sivasamy SRM Institute of Science and Technology, Ramapuram, Chennai, India
    • Srinivas K N SRM Institute of Science and Technology, Ramapuram, Chennai, India
    https://doi.org/10.14419/9beq9v16

    Received date: November 7, 2025

    Accepted date: December 3, 2025

    Published date: December 7, 2025

  • Axial Flux Permanent Magnet Synchronous Motor (AF-PMSM); Material Optimization; Motor Efficiency; Electric Vehicle Traction Drive‎.

  • Abstract

    This study investigates the material-dependent performance of an axial flux permanent magnet synchronous motor (AF-PMSM) through a ‎systematic evaluation of magnet, core, and conductor combinations. The analysis reveals that transitioning from ferrite to high-energy ‎NdFeB magnets significantly enhances efficiency, ranging from 74.58% to 85.91%, while concurrently increasing sensitivity to iron-core ‎losses. Employing low-loss core materials, particularly Hiperco50, markedly improves overall efficiency, underscoring the necessity of ‎advanced magnetic alloys in high-flux-density motor systems. Among the examined magnets, the advanced N55 grade NdFeB achieves the ‎highest efficiency (87.19%) and lowest loss, surpassing Alnico5 and SmCo24. Although SmCo24 offers superior thermal stability, its per-‎formance remains inferior to that of N55. Conductor analysis further reveals that silver windings yield the highest efficiency (88.03%) and ‎lowest total losses, slightly outperforming conventional copper at the expense of increased weight. Gold and aluminium conductors, by ‎contrast, exhibit reduced efficiency due to higher resistivity. The findings highlight the crucial interplay between magnet strength, core loss ‎characteristics, and conductor resistivity in determining overall AF-PMSM efficiency, providing valuable insight for the material optimiza-‎tion of traction motors in electric vehicle applications‎.

  • References

    1. L. R. Devi, S. Sreekumar, R. Bhakar, and S. Padmanaban, "Electric motor modeling, analysis, and design for E-mobility applications: A state of the art," e-Prime-Advances in Electrical Engineering, Electronics and Energy, p. 100985, 2025. https://doi.org/10.1016/j.prime.2025.100985.
    2. P. Sankhwar, "Application of permanent magnet synchronous motor for electric vehicle," Application of Permanent Magnet Synchronous Motor for Electric Vehicle, vol. 4, no. 2, pp. 1-6, 2024. https://doi.org/10.54105/ijde.A8028.04020824.
    3. S. Simizu, P. R. Ohodnicki, and M. E. McHenry, "Metal amorphous nanocomposite soft magnetic material-enabled high power density, rare earth free rotational machines," IEEE Transactions on Magnetics, vol. 54, no. 5, pp. 1-5, 2018. https://doi.org/10.1109/TMAG.2018.2794390.
    4. A. Mahmoudi, N. Abd Rahim, and H. W. Ping, "Axial-flux permanent-magnet motor design for electric vehicle direct drive using sizing equation and finite element analysis," Progress In Electromagnetics Research, vol. 122, pp. 467-496, 2012. https://doi.org/10.2528/PIER11090402.
    5. M. M. Elymany et al., "Advanced methodology for maximum torque point tracking of hybrid excitation PMSM for EVs," Scientific Reports, vol. 15, no. 1, p. 7707, 2025. https://doi.org/10.1038/s41598-025-92466-y.
    6. A. Parviainen, "Design of axial-flux permanent-magnet low-speed machines and performance comparison between radial-flux and axial-flux ma-chines," 2005.
    7. M. De Oliveira, V. Steffen, and F. Trojan, "Systematic literature review on electric vehicles and multicriteria decision making: Trends, rankings, and future perspectives," J. Intell. Manag. Decis, vol. 3, no. 1, pp. 22-41, 2024. https://doi.org/10.56578/jimd030103.
    8. L. s. Vidyapeeth, M. U. Yadav, and J. D. Kumar, "Choosing the Right Drive: In-depth Motor Selection for Electric Vehicle Traction Systems."
    9. D. O’Donnell, S. Bartos, J. Tjong, and N. C. Kar, "Utilization of innovative materials toward permanent magnet synchronous e-motors for traction application: A review," in 2020 2nd International Conference on Smart Power & Internet Energy Systems (SPIES), 2020: IEEE, pp. 380-385. https://doi.org/10.1109/SPIES48661.2020.9243017.
    10. R.-f. Liu, X. Ma, J.-c. Cao, S.-x. Niu, and Z.-g. Wu, "Influence of Amorphous and Silicon Steel on Performance of Permanent Magnet Synchro-nous Motors Used in Steering Pump of Electric Vehicles," Journal of Magnetics, vol. 24, no. 2, pp. 335-341, 2019. https://doi.org/10.4283/JMAG.2019.24.2.335.
    11. S. Rani and R. Jayapragash, "Review on electric mobility: trends, challenges and opportunities," Results in Engineering, vol. 23, p. 102631, 2024. https://doi.org/10.1016/j.rineng.2024.102631.
    12. M. Fasil, "Design, modelling, and fabrication of a ferrite magnet axial flux in-wheel motor," 2018.
    13. Q. Chen, D. Liang, Y. Liu, and Q. Wang, "Design and multi‐object optimisation of axial flux interior PMSM for EV and HEV applications," The Journal of Engineering, vol. 2017, no. 13, pp. 2215-2220, 2017. https://doi.org/10.1049/joe.2017.0724.
    14. R. Tsunata, K. Izumiya, M. Takemoto, J. Imai, T. Saito, and T. Ueno, "Designing and prototyping an axial-flux machine using ferrite PM and round wire for traction applications: Comparison with a radial-flux machine using Nd-Fe-B PM and rectangular wire," IEEE Transactions on Industry Ap-plications, vol. 60, no. 3, pp. 3934-3949, 2024. https://doi.org/10.1109/TIA.2024.3371959.
    15. M. H. Mohammadi, R. Nasirizarandi, J. Mistry, and A. Balamurali, "Design of Reduced and Rare-Earth-Free PM-assisted SynRMs for Electric Ve-hicles to Overcome Electromagnetic-Structural Challenges," in 2025 IEEE International Electric Machines & Drives Conference (IEMDC), 2025: IEEE, pp. 865-870. https://doi.org/10.1109/IEMDC60492.2025.11061102.
    16. H.-S. Seol, "Advanced 3D Nonlinear Magnetic Equivalent Circuit Model for Overhang-Type WRSM Design," Electronics, vol. 14, no. 7, p. 1304, 2025. https://doi.org/10.3390/electronics14071304
    17. Y. Zhou, K. Liu, X. Yang, C. Zeng, and B. Luo, "Simplified analysis model of axial flux permanent magnet synchronous motor," in 2023 26th In-ternational Conference on Electrical Machines and Systems (ICEMS), 2023: IEEE, pp. 339-343. https://doi.org/10.1109/ICEMS59686.2023.10345203
    18. R. Akinci and M. Polat, "Design and optimization with genetic algorithm of double rotor axial flux permanent magnet synchronous motor (torus type) for electrical vehicles," in 2019 4th International Conference on Power Electronics and their Applications (ICPEA), 2019: IEEE, pp. 1-5. https://doi.org/10.1109/ICPEA1.2019.8911175.
    19. K. P. Schneider, S. Simizu, M. E. McHenry, and M. P. de Boer, "Optimization Study of Rare Earth-Free Metal Amorphous Nanocomposite Axial Flux-Switching Permanent Magnet Motor," Energies, vol. 18, no. 3, p. 640, 2025. https://doi.org/10.3390/en18030640
    20. [20] B. Ban, A. Kersten, S. Skoog, L. Sjöberg, S. Stipetić, and T. Batra, "Comparative Analysis of Electric Motor Designs: Traditional Steel Laminations vs. Soft Magnetic Composite Materials," in 2024 International Conference on Electrical Machines (ICEM), 2024: IEEE, pp. 1-8. https://doi.org/10.1109/ICEM60801.2024.10700236.
    21. [21] A. Shukla and S. Basak, "Impact of Flux Barriers Shape on the Performance of Reduced Rare-Earth Multilayer Interior Permanent Magnet Synchronous Motor," in IECON 2024-50th Annual Conference of the IEEE Industrial Electronics Society, 2024: IEEE, pp. 1-6. https://doi.org/10.1109/IECON55916.2024.10905700.
    22. [22] E. M. Hammad, F. E. Abdel-Kader, M. E. Ibrahim, and M. A. Shanab, "Rotor Flux Barrier Design for Torque Improvement in Syn-chronous Reluctance Motor," in 2024 25th International Middle East Power System Conference (MEPCON), 2024: IEEE, pp. 1-6. https://doi.org/10.1109/MEPCON63025.2024.10850139.
    23. [23] R. Chattopadhyay, J. Jung, M. S. Islam, I. Boldea, and I. Husain, "Rare-Earth Free Unity Power Factor Bi-Axial Excitation Syn-chronous Machine for Traction Applications," IEEE Transactions on Industry Applications, vol. 60, no. 4, pp. 5966-5978, 2024. https://doi.org/10.1109/TIA.2024.3379312.
    24. [24] K. Akizuki et al., "Study of Current Third-Order Harmonics Control to Reduce Iron Loss in Permanent Magnet Synchronous Mo-tors," in 2024 IEEE Energy Conversion Congress and Exposition (ECCE), 2024: IEEE, pp. 6252-6257. https://doi.org/10.1109/ECCE55643.2024.10861013
    25. [25] I. Shuaibu, E. H. T. Wei, R. Kannan, and Y. A. Samaila, "Advancements in axial flux permanent magnet machines utilizing coreless technology: A systematic review," Ain Shams Engineering Journal, vol. 15, no. 12, p. 103091, 2024. https://doi.org/10.1016/j.asej.2024.103091
    26. [26] P. Samanta, S. B. Mitikiri, P. K. Sahay, and V. L. Srinivas, "A comparative review of radial and axial Flux PMSMs: Innovations in topology, design, and control," Franklin Open, p. 100341, 2025. https://doi.org/10.1016/j.fraope.2025.100341.

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  • How to Cite

    Swaminathan, S. ., Sivasamy, S. ., & K N, S. . (2025). Material Synergy and Efficiency Enhancement in Axial Flux ‎PMSM: Influence of Magnet, Core and Conductor ‎Combinations. International Journal of Basic and Applied Sciences, 14(8), 142-153. https://doi.org/10.14419/9beq9v16