Designs of PMSMs with Inner and Outer Rotors for Electric Bicycle Applications

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Harwan Mohammed Taha Ismaeil Alnaab


In this paper, designs of two rotor structures of permanent magnet synchronous motor (PMSM) are proposed in order to find the suitable one to drive an electric bicycle, namely, inner rotor and outer rotor. Both motors are designed to run at a rated speed of 20 Km/h and rated power of 250 W. This paper compares the performance of both proposed motors and the comparison between them is in terms of motor size, weight, cost and efficiency. In addition, this work uses the second design, which is the PMSM with outer rotor to investigate the effects of some motor parameters on motor performance; the parameters are current, advanced angle, stack length and external diameter. In this work, Motor Solve software is used to design and analyze the performance of both motors. According to the simulation and calculation results, both motors achieved the required rated speed and torque at high efficiency and reasonable cost. Nevertheless, the PMSM with inner rotor obtained the required specifications with lighter weight and smaller size than the PMSM with outer rotor. Therefore, it is a proper choice for driving an electric bicycle that has a limitation regarding the motor space. Regarding parameters’ effect, the simulation figures and data show that the motor torque will increase if we increase supply current, stack length and external diameter, while speed decreases as it inversely changes with torque. Except for advance angle which helps motor to produce maximum possible torque at a higher speed.



Permanent magnet synchronous motor, Inner rotor, Outer rotor, Electric bicycle, Motor Solve.


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[1] S. B. Bhat, S. P. Nikam and B. G. Fernandes, "Design and analysis of ferrite based permanent magnet motor for electric assist bicycle," in 2014 International Conference on Electrical Machines (ICEM), 2014.
[2] J. Lin, N. Schofield and A. Emadi, "External-Rotor 6-10 Switched Reluctance Motor for an Electric Bicycle," IEEE Transactions on Transportation electrification, vol. 1, pp. 348-356, 2015.
[3] T. F. Chan, L.-T. Yan and S.-Y. Fang, "In-wheel permanent-magnet brushless DC motor drive for an electric bicycle," IEEE Transactions on Energy conversion, vol. 17, pp. 229-233, 2002.
[4] A. H. Isfahani and S. Sadeghi, "Design of a permanent magnet synchronous machine for the hybrid electric vehicle," World academy of science, engineering and technology, vol. 45, pp. 566-570, 2008.
[5] D. Martinez, Design of a permanent-magnet synchronous machine with non-overlapping concentrated windings for the shell eco marathon urban prototype, 2012.
[6] W. Chlebosz, G. Ombach and J. Junak, "Comparison of permanent magnet brushless motor with outer and inner rotor used in e-bike," in The XIX International Conference on Electrical Machines-ICEM 2010, 2010.
[7] K.-S. Kim, S.-H. Lee, H.-R. Cha, K.-S. Lee and S.-J. Park, "Design and analysis of outer rotor type IPMSM for an electric bicycle," in INTELEC 2009-31st International Telecommunications Energy Conference, 2009.
[8] A. G. Jack, B. C. Mecrow and C. P. Maddison, "Combined radial and axial permanent magnet motors using soft magnetic composites," 1999.
[9] J. M. Seo, S. H. Rhyu, I. S. Jung and H. K. Jung, "A design of multi flux permanent-magnet machine for electric bicycles," in 2015 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia), 2015.
[10] C. Liu, C. H. T. Lee and M. Chen, "Comparison of outer-rotor permanent magnet machines for in-wheel drives," in 2013 IEEE International Symposium on Industrial Electronics, 2013.
[11] J. Li, Q. Wang, J. Yu and J. Xiong, "Field-weakening control algorithm for interior permanent magnet synchronous motor based on space-vector modulation technique," Journal of Convergence Information Technology, vol. 8, pp. 1-9, 2013.
[12] M. S. Mohd and M. N. Karsiti, "Effect of phase advance on the brushless dc motor torque speed respond," in IOP Conference Series: Materials Science and Engineering, 2015.
[13] X. Liu, H. Chen, J. Zhao and A. Belahcen, "Research on the performances and parameters of interior PMSM used for electric vehicles," IEEE Transactions on Industrial Electronics, vol. 63, pp. 3533-3545, 2016.