No abstract

In this paper, two kinds of torque ripple optimization methods are proposed for Switched Reluctance Motors due to the mutual coupling between phases. When phase number of SRM is more than two, SRM is often running in status of two phases excited simultaneously, then mutual inductance will be occurred between phases. The mutual coupling will affect the current waveform, thereby affecting the torque. This paper take a six phase 12/10 SRM as an example, four kinds of arrangements of stator magnetic polarity based on the two kinds of winding connections is given and the asymmetry of the magnetic distribution in the four modes is described. For NNSS arrangements of stator magnetic polarity, the phenomenon of asymmetry currents and the resulting torque ripple is analyzed using finite method.Based on the analysis of mutual inductance, the limitations of stator and rotor poles arc is given and an asymmetric control strategy is proposed to reduce the torque ripple.The simulation shows that the average torque is increased and the torque ripple is reduced.

Due to the separation of magnetic field, electrical isolation and thermal isolation, motor drives possess a high fault-tolerance characteristic. In this paper, comparative study of mutual inductance between the proposed segmented rotor switched reluctance motor (SSRM) and the conventional switched reluctance motor (SRM) is carried out first, illustrating that the proposed SSRM has less mutual inductance between phases than the conventional SRM. In addition, if winding faults or power converter faults lead to phase failure, a comparative analysis on fault-tolerant performance under phase failure condition between the proposed SSRM and the conventional SRM is simulated in detail using the finite element method (FEM). Simulation results reveal that dynamic performance of the proposed SSRM, including output torque and phase current, is better than that of the conventional SRM. That is, the capacity of operating with the fault under phase failure condition in the proposed SSRM is superior to that in the conventional SRM.

This paper proposes a novel 16/10 segmented rotor switched reluctance motor (SSRM) for belt-driven starter generators (BSGs). Different from conventional SRMs, the stator of the proposed SSRM consists of two types of stator poles, i.e., exciting and auxiliary poles, and the rotor is constructed from a series of discrete segments. The topology and operation principle of this proposed SSRM are illustrated firstly, and then the design rules are listed. In addition, the finite element method (FEM) is employed to get the static and dynamic characteristics of the proposed SSRM. Finally, the simulation results are presented to show the validity of the proposed SSRM for BSGs.