A Preliminary Study on Flux-Boosted Enhanced-Torque Switched Reluctance Motors: Teethed-Pole and PM-Inserted Structures

This article proposes an innovative teethed-pole flux-boosted switched reluctance motor (SRM) with permanent magnets (PMs) inserted inside the stator back-iron and neighboring teeth. Both the yoke and the tooth magnets enhance the airgap flux density significantly. However, the former lowers the saturation level in the stator back-iron and the latter decreases it inside the poles of stator. The proposed SR motor is defined and its basics of operation are delineated. To illustrate the efficacy of the PMs on the operation of the proposed SRM, simulations are carried out in terms of the distributions of flux density, flux linkage, and output torque adopting a two-dimensional finite element method (FEM). The results illustrate that the introduced dual-PM structure delivers higher torque than its PMless, tooth-PM, and yoke-PM counterparts. Furthermore, the reluctance and PM torques are segregated to reveal that the tooth PMs make more contribution in torque production than the yoke PMs.