A Modular Hybrid Excited Switched Reluctance Motor With Two Groups of Permanent Magnets to Enhance the Performance of the Motor

This paper presents a new modular hybrid excited switched reluctance motor (MHESRM) with permanent magnets (PMs) embedded between stator teeth. The effect of the PMs is to reduce the magnetic saturation in the teeth of the stator, poles, and yoke, and to increase the magnetic flux in the air gap increases, leading to the significant enhancement of developed electromagnetic torque. Also, the magnetic equivalent circuit shows that when both groups of PMs are embedded in the structure, the air gap magnetic flux increases. MHESRM, with four teeth per stator's pole, has better static performance. However, MHESRM with two teeth per stator's pole has better dynamic performance and a higher mean steady-state electromagnetic torque. Finally, the 16/18 MHESRM opts due to its superior dynamic performance. The proposed MHESRM is optimized using the genetic algorithm for the best torque performance. Additionally, its dynamic and static characteristics are compared with an 8/12 SRM, an 8/4 SRM, three hybrid reluctance motors, and a flux-switching PM motor of the same size. The prototype of the proposed topology was built for experimental verification. The simulation and experimental results for the proposed motor agree significantly, leading to high torque density.