Analysis of a Permanent Magnet Switched Reluctance Motor with New Arrangements for Permanent Magnets

This paper introduces new arrangement for permanent magnet (PM) displacement in the structure of split-tooth switched reluctance motors (SRMs). In order to enhance the torque characteristics of SRMs, two or three PMs are inserted between the small teeth of the modules, which result in dual-PM SRM (DPMSRM) and triple PM SRM (TPMSRM). First, the motor topologies are introduced and their basics of working are delineated based on the predicted flux flow lines. To evaluate the predictions, the two proposed PMSRMs along with their PMless counterpart are simulated with a finite element analysis (FEA) software, and the results are obtained in terms of flux density distributions, flux linkage, and torque curves. The results indicate that the TPMSRM offers the highest average torque among all motors. Moreover, the DPMSRM produces higher torque than the PMless structure. In addition, not only the PMs enhance the torque production capability, they decrease the saturation level in iron parts, which can reduce core losses.