The vibration of SRM obtains less attention for in-wheel motor applications according to the present research works. In this paper, the vertical component of SRM unbalanced radial force, which is named as SRM vertical force, is taken into account in suspension performance for in-wheel motor driven electric vehicles (IWM-EV). The analysis results suggest that SRM vertical force has a great effect on suspension performance. The direct cause for this phenomenon is that SRM vertical force is directly exerted on the wheel, which will result in great variation in tyre dynamic load and the tyre will easily jump off the ground. Furthermore, the frequency of SRM vertical force is broad which covers the suspension resonance frequencies. So it is easy to arouse suspension resonance and greatly damage suspension performance. Aiming at the new problem, FxLMS (filtered-X least mean square) controller is proposed to improve suspension performance. The FxLMS controller is based on active suspension system which can generate the controllable force to suppress the vibration caused by SRM vertical force. The conclusion shows that it is effective to take advantage of active suspensions to reduce the effect of SRM vertical force on suspension performance. 1. Introduction Electric vehicles have achieved sufficient driving performance due to the great improvements in motors and batteries. Due to the remarkable advantages, for example, highly efficient transfer of power, driving force to be distributed freely, and space saving and packaging, the in-wheel motor technology has become the focus of electric vehicle investigation [1–3]. As the key component of propulsion system, electric motors play an important role in in-wheel motor driven electric vehicles (IWM-EV) dynamics. It is desired that electric motors of electric vehicles have a wide operating speed range, high torque density, a high starting torque for initial acceleration, and high efficiency to extend the battery serve-life [4, 5]. And the switched reluctance motor (SRM) exactly satisfied the above requirements [6–8]. However, these advantages of SRM are overshadowed by its inherent high torque ripple and vibration, which seriously hindered the development of SRM for in-wheel motor applications [9–12]. To reduce or eliminate the insufficiency of SRM, much attention has been focused on SRM structure and control. To improve the performance of SRM, the common solution is to increase SRM power density starting torque and efficiency by optimal control method or multiobjective systematic optimization design [13–16]. These
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