Factors for Reducing Torque Ripple in a Topology-Optimized Shape of SynRM Considering Multiple Driving Points

This paper discusses the factors for reducing torque ripple in a topology-optimized shape of a synchronous reluctance motor (SynRM) considering multiple driving points. To fairly compare the torque characteristics of the proposed SynRM with those of conventional SynRMs with multiple-flux barriers and the topology-optimized shape considering a single driving point, we discuss magnetic properties for wide driving points. In this work, we use the Fourier components of a magnetic force density (MFD) in the air gap for discussing the difference in the torque ripple of the proposed and conventional SynRMs. Moreover, we modify the flux barrier shape in the proposed SynRM to verify the effectiveness for torque ripple reduction of the topology-optimized shape. We observe that the proposed SynRM not only reduces the spatial higher harmonics of MFDs for minimum and maximum torques but also matches their phases to reduce the torque ripple.