The large vibration and noise of switched reluctance motor (SRM) limits development in the field of electric bicycles. The innovation of the paper lies in reducing torque ripple by advancing the turn-on angle and increasing air-gap permeability in the first half of two phase exchange region. The torque ripple of a novel Multi-Teeth External Rotor SRM (MTER-SRM) is studied in the paper. Firstly, the topology structure, working principle and optimized process of the MTER-SRM are introduced. Secondly, the method to suppress the torque ripple by advancing turn-on angle is proved theoretically. The effect of advancing turn-on angle on torque ripple is analyzed, and turn-on angle is optimized by Finite Element Method (FEM). Thirdly, the mathematical model is built to analyze the change of air-gap permeability in the aligned and unaligned position. The effect of different angles and heights of pole shoe on the torque characteristics is analyzed by FEM, and optimized parameters of single pole shoe size are obtained. Finally, the results show that torque ripple has dropped from 1.5 to 0.4, with the decrease of 73.3%. The multi-physical field results show that the vibration displacement, velocity, acceleration and noise pressure of stator decrease by 83.3%, 52.5%, 52.2%, and 54.2%, respectively. Meanwhile, the vibration test of the prototype also shows that the maximum vibration acceleration has dropped from 0.4 to 0.1, with the decrease of 75%. The vibration and noise of the MTER-SRM is decreased significantly by this method, which can provide a demonstration for developing high performance motor applied in electric bicycle.
1. Zhu, Z. Q., X. Liu, and Z. Pan, "Analytical model for predicting maximum reduction levels of vibration and noise in switched reluctance machine by active vibration cancellation," IEEE Transactions on Energy Conversion, Vol. 26, No. 1, 36-45, 2011. doi:10.1109/TEC.2010.2087336
2. Gan, C., J. Wu, Q. Sun, W. Kong, H. Li, and Y. Hu, "A review on machine topologies and control techniques for low-noise switched reluctance motors in electric vehicle applications," IEEE Access, Vol. 6, 31430-31443, 2018. doi:10.1109/ACCESS.2018.2837111
3. Takiguchi, M., H. Sugimoto, N. Kurihara, and A. Chiba, "Acoustic noise and vibration reduction of SRM by elimination of third harmonic component in sum of radial forces," IEEE Transactions on Energy Conversion, Vol. 30, No. 3, 883-891, 2015. doi:10.1109/TEC.2015.2401398
4. Qing, L. W. H. M. and X. L. Ge, "A high efficiency torque ripple suppression method for switched reluctance motor," Transactions of China Electrotechnical Society, Vol. 35, No. 9, 1912-1920, 2020.
5. Andrada, P., B. Blanqué, E. Martínez, and M. Torrent, "A novel type of hybrid reluctance motor drive," IEEE Transactions on Industrial Electronics, Vol. 61, No. 8, 4337-4345, 2014. doi:10.1109/TIE.2013.2279384
6. Jeong, K. I. X. Z. and D. H. Lee, "Performance comparison of conventional and segmental rotor type switched reluctance motor," Journal of Electrical Engineering & Technology, Vol. 13, No. 3, 1138-1146, 2018.
7. Mousavi-Aghdam, S. R., M. R. Feyzi, and Y. Ebrahimi, "A new switched reluctance motor design to reduce torque ripple using finite element fuzzy optimization," Iranian Journal of Electrical & Electronic Engineering, Vol. 8, No. 1, 91-96, 2012.
8. Gundogmus, O., M. Elamin, Y. Yasa, T. Husain, Y. Sozer, J. Kutz, J. Tylenda, and R. L. Wright, "Acoustic noise mitigation of switched reluctance machines with windows on stator and rotor pole shoes," IEEE Transactions on Industry Applications, Vol. 56, No. 4, 3719-3730, 2020.
9. Lee, D., T. H. Pham, and J. Ahn, "Design and operation characteristics of four-two pole shoe high-speed SRM for torque ripple reduction," IEEE Transactions on Industrial Electronics, Vol. 60, No. 9, 3637-3643, 2013. doi:10.1109/TIE.2012.2208432
10. Jiang, J. W., B. Bilgin, and A. Emadi, "Three-phase 24/16 switched reluctance machine for a hybrid electric powertrain," IEEE Transactions on Transportation Electrication, Vol. 3, No. 1, 76-85, 2017. doi:10.1109/TTE.2017.2664778
11. Huang, C. Z. S. W. F. and G. X. Guo, "Optimization of stator pole shoe shape based on torque ripple and radial force," Electric Machines and Control, Vol. 24, No. 6, 98-106, 2020.
12. Lee, J. H., "Optimum shape design solution of flux switching motor using response surface methodology and new type winding," IEEE Transactions on Magnetics, Vol. 48, No. 4, 1637-1640, 2012. doi:10.1109/TMAG.2011.2173564
13. Yang, H., Y. Lim, and H. Kim, "Acoustic noise/vibration reduction of a single-phase SRM using skewed stator and rotor," IEEE Transactions on Industrial Electronics, Vol. 60, No. 10, 4292-4300, 2013. doi:10.1109/TIE.2012.2217715
14. Nabeta, S. I., I. E. Chabu, L. Lebensztajn, D. A. P. Correa, W. M. D. Silva, and K. Hameyer, "Mitigation of the torque ripple of a switched reluctance motor through a multiobjective optimization," IEEE Transactions on Magnetics, Vol. 44, No. 6, 1018-1021, 2008. doi:10.1109/TMAG.2007.915137
15. Guo, X., R. Zhong, M. Zhang, D. Ding, and W. Sun, "Resonance reduction by optimal switch angle selection in switched reluctance motor," IEEE Transactions on Industrial Electronics, Vol. 67, No. 3, 1867-1877, 2020. doi:10.1109/TIE.2019.2902833
16. Li, G., J. Ojeda, S. Hlioui, E. Hoang, M. Lecrivain, and M. Gabsi, "Modification in rotor pole shoe geometry of mutually coupled switched reluctance machine for torque ripple mitigating," IEEE Transactions on Magnetics, Vol. 48, No. 6, 2025-2034, 2012. doi:10.1109/TMAG.2011.2179307
17. Lee, J. W., H. S. Kim, B. I. Kwon, and B. T. Kim, "New rotor shape design for minimum torque ripple of SRM using FEM," IEEE Transactions on Magnetics, Vol. 40, No. 2, 754-757, 2004. doi:10.1109/TMAG.2004.824803
18. Zhang, X., X. Wang, and Y. Yang, "The computation of vibration reduction capacity for switched reluctance motor based on improved magnetic field partition method," Transactions of China Electrotechnical Society, Vol. 30, No. 22, 9-18, 2015.
19. Zhang, X., X. Wang, Y. Yang, and B. Wei, "Vibration reduction of a switched reluctance motor using new rotor tooth with slot on each side," Proceedings of the CSEE, Vol. 35, No. 6, 1508-1515, 2015.
20. Lin, F. and S. Yang, "An approach to producing controlled radial force in a switched reluctance motor," IEEE Transactions on Industrial Electronics, Vol. 54, No. 4, 2137-2146, 2007. doi:10.1109/TIE.2007.895129
21. Mousavi-Aghdam, S. R., M. R. Feyzi, N. Bianchi, and M. Morandin, "Design and analysis of a novel high-torque stator-segmented SRM," IEEE Transactions on Industrial Electronics, Vol. 63, No. 3, 1458-1466, 2016. doi:10.1109/TIE.2015.2494531