An Investigation into the Effect of Non-segmented Rotor on the Torque of an Outer Rotor Switched Reluctance Motor for In-wheel Electric Vehicle Application
High torque electric machines have been found in numerous applications in the industry including electric vehicle applications. It is not possible to achieve a considerable increase in the torque-producing capability of the machine by common optimization of the structure of electric machines. Hence, appropriate solutions for increasing the machine torque should be searched by proposing a different structure and focusing on the exact analysis of the machine forces. Deep knowledge of the electromechanical energy conversion process and the distribution of the force’s components will allow designing and developing a high torque density electric machine. Accordingly, in this paper, a double-stator switched reluctance motor is analyzed, firstly. Subsequently, based on the analysis, a high torque switched reluctance machine titled “outer rotor switched reluctance machine” for the in-wheel electric vehicle is designed. Finally, the effect of the non-segmented rotor is examined. Simulation is performed by the finite element method (FEM) in the MAGNET software.
 Rahman, K.M. and S.E. Schulz, Design of high-efficiency and high-torque-density switched reluctance motor for vehicle propulsion. IEEE Transactions on Industry Applications, 2002. 38(6): p. 1500-1507.
 Miller, T.J.E., Electronic control of switched reluctance machines. 2001: Elsevier.
 Krishnan, R., Switched reluctance motor drives: modeling, simulation, analysis, design, and applications. 2001: CRC press.
 Jiang, W., et al. Qualitative investigation of force density components in electromechanical energy conversion process. in IECON 2006-32nd Annual Conference on IEEE Industrial Electronics. 2006. IEEE.
 Zeng, H., Z. Chen, and H. Chen, Smooth torque speed characteristic of switched reluctance motors. Journal of power electronics, 2014. 14(2): p. 341-350.
 Toliyat, H.A., L. Xu, and T.A. Lipo, A five-phase reluctance motor with high specific torque. IEEE Transactions on Industry Applications, 1992. 28(3): p. 659-667.
 Hayashi, H., et al., Efficiency improvements of switched reluctance motors with high-quality iron steel and enhanced conductor slot fill. IEEE Transactions on Energy Conversion, 2009. 24(4): p. 819-825.
 Desai, P.C., et al., Novel switched reluctance machine configuration with higher number of rotor poles than stator poles: Concept to implementation. IEEE Transactions on Industrial Electronics, 2010. 57(2): p. 649-659.
 Chiba, A., et al., Development of a rare-earth-free SR motor with high torque density for hybrid vehicles. IEEE Transactions on Energy Conversion, 2015. 30(1): p. 175-182.
 Mecrow, B.C., et al., Preliminary performance evaluation of switched reluctance motors with segmental rotors. IEEE Transactions on Energy Conversion, 2004. 19(4): p. 679-686.
 Andrada, P., et al., A novel type of hybrid reluctance motor drive. IEEE transactions on industrial electronics, 2014. 61(8): p. 4337-4345.
 Abbasian, M., M. Moallem, and B. Fahimi, Double-stator switched reluctance machines (DSSRM): Fundamentals and magnetic force analysis. IEEE Transactions on energy conversion, 2010. 25(3): p. 589-597.
 Rallabandi, V. and B.G. Fernandes, Design procedure of segmented rotor switched reluctance motor for direct drive applications. IET Electric Power Applications, 2014. 8(3): p. 77-88.