Design modifications for improving modulation flux capability of consequent-pole vernier-PM machine in comparison to conventional vernier-PM machines

Document Type : Article

Author

Department of Engineering, Persian Gulf University, Bushehr, P.O. Box 7516913817, Iran

Abstract

The Vernier PM (VPM) machine is known as a high-torque and low speed drive solution suitable for direct-drive applications such as electric vehicles and wind turbines. The Consequent-Pole Vernier PM (CP-VPM) machine is a special structure of VPM that also introduces high torque density as the conventional VPM incorporating significantly lower volume of PM materials. Although many researches and experiment studies, especially in recent years, reported concerning the conventional structure, there are little publications on the CP-VPM machine. The paper presents the electromagnetic principles of modulation flux occurring in CP-VPM machine. The operating quantities are evaluated using analytical equations and compared with the conventional machine performance. It is concluded that the torque density and back-EMF are much larger than the conventional machine and the torque pulsation magnitude is lower. However, the power-factor is undesirably reduced due to higher spatial harmonics distortion of the CP rotor magnetic field and presence of magnetic field components that do not contribute in the flux modulation. Based on the spatial harmonic analysis, design modifications for enhancing the operational characteristics of the CP-VPM machine are proposed and their effectiveness is verified through comparing the 2D-FE results with the results of the conventional VPM machines.

Keywords

References

  1. Refrences;

    1. Wu, Y.C. and Chen, Y.T. Mitigation of cogging torque for brushless interior permanent-magnet motors", Scientia Iranica, 22(6), pp. 2163{2169 (2015).
    2. Abbaszadeh, K. and Rahimi, A. Analytical quasi 3D modeling of an axial ux PM motor with static eccentricity fault", Scientia Iranica, 22(6), pp. 2482{ 2491 (2015).
    3. Du, Z.S. and Lipo, T.A. Torque performance comparison between a ferrite magnet vernier motor and an industrial interior permanent magnet machine", IEEE Transactions on Industry Applications, 53(3), pp. 2088{2097 (2017).
    4. Wang, H., Fang, S., Yang, H., et al. A Novel consequent-pole hybrid excited vernier machine", IEEE Transactions on Magnetics, 53(11), pp. 1{4 (2017).
    5. Ishizaki, A., Tanaka, T., Takasaki, K., et al. Theory and optimum design of PM Vernier motor", 1995 Seventh International Conference on Electrical Machines and Drives (Conf. Publ. No. 412), Durham, UK, pp. 208{212 (1995). 6. Bai, J., Liu, J., Wang, M., et al. Investigation of a less rare-earth permanent-magnet machine with the consequent pole rotor", AIP Advances, 8(5), pp. 1{6 (2018). 7. Li, D., Qu, R., Li, J., et al. Design of consequent pole, toroidal winding, outer rotor vernier permanent magnet machines", 2014 IEEE Energy Conversion Congress and Exposition (ECCE), Pittsburgh, PA, pp. 2342{2349 (2014). 8. Zhao, W., Zheng, J., Wang, J., et al. Design and analysis of a linear permanent- magnet vernier machine With improved force density", IEEE Transactions on Industrial Electronics, 63(4), pp. 2072{2082 (2016). 9. Zou, T., Li, D., Qu, R., et al. Analysis of a dualrotor, toroidal-winding, axial-ux vernier permanent magnet machine", IEEE Transactions on Industry Applications, 53(3), pp. 1920{1930 (2017). 10. Zou, T., Li, D., Qu, R., et al. Advanced high torque density PM vernier machine with multiple working harmonics", IEEE Transactions on Industry Applications, 53(6), pp. 5295{5304 (2017). 11. Zhao, W., Chen, D., Lipo, T. A., et al. Dual airgap stator- and rotor-permanent magnet machines with spoke-type con_gurations using phase-group concentrated coil windings", IEEE Transactions on Industry Applications, 53(4), pp. 3327{3335 (2017). 12. Xu, L., Liu, G., Zhao, W., et al. High-performance fault tolerant halbach permanent magnet vernier machines for safety-critical applications", IEEE Transactions on Magnetics, 52(7), pp. 1{4 (2016). 13. Xie, K., Li, D., Qu, R., et al. A novel permanent magnet vernier machine with halbach array magnets in stator slot opening", IEEE Transactions on Magnetics, 53(6), pp. 1{5 (2017). 14. Zhu, X., Zhao, W., and Zhu, J. A high power factor fault-tolerant vernier permanent-magnet machine", AIP Advances, 7(5), pp. 1{4 (2017). 15. Kim, B. and Lipo, T.A. Operation and design principles of a PM vernier motor", IEEE Transactions on Industry Applications, 50(6), pp. 3656{3663 (2014). 16. Ho, S.L., Niu, S., and Fu, W.N. Design and comparison of vernier permanent magnet machines", IEEE Transactions on Magnetics, 47(10), pp. 3280{3283 (2011). 17. Li, D., Qu, R., Li, J., et al. Analysis of torque capability and quality in vernier permanent-magnet machines", IEEE Transactions on Industry Applications, 52(1), pp. 125{135 (2016). 18. Yang, Y., Liu, G., Yang, X., et al. Analytical electromagnetic performance calculation of vernier hybrid permanent magnet machine", IEEE Transactions on Magnetics, 54(6), pp. 1{12 (2018). 19. Kim, B. Design of a PM vernier machine with consideration for modulation ux and comparison with conventional PM motors", Energies, 10(11), pp. 1{12 (2017). 20. Okada, K., Niguchi, N., and Hirata, K. Analysis of a vernier motor with concentrated windings", IEEE Transactions on Magnetics, 49(5), pp. 2241{2244 (2013). 21. Liu, G., Jiang, S., Zhao, W., et al. A new modeling approach for permanent magnet vernier machine with modulation e_ect consideration", IEEE Transactions on Magnetics, 53(1), pp. 1{12 (2017). 22. Li, D., Qu, R., Li, J., et al. Analysis of torque capability and quality in vernier permanent-magnet machines", IEEE Transactions on Industry Applications, 52(1), pp. 125{135 (2016). 23. Heller, B. and Hamata, V., Harmonics Field E_ects in Induction Machines, Elsevier Scienti_c Pub. (1977). 24. Li, D., Qu, R., and Lipo, T.A. High-power-factor vernier permanent-magnet machines", IEEE Transactions on Industry Applications, 50(6), pp. 3664{3674 (2014).
Scientia Iranica
Volume 27, Issue 6 - Serial Number 6
Transactions on Computer Science & Engineering and Electrical Engineering (D)
November and December 2020
Pages 3150-3161

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