Study on the Design of Six Phase Surface Inset Permanent Magnet Synchronous Generator and Motor Considering the Power Factor and Torque Ripple

Abstract

In this paper, a design of six-phase surface inset permanent magnet synchronous machine (SIPMSM) with the open slots is performed considering the power factor and torque ripple. Because of the reluctance torque component by the q-axis core thickness of rotor, a surface inset permanent magnet synchronous machine (SIPMSM) has the high torque density but the large torque ripple. To overcome the large torque ripple, there are the various design method. In case of SIPMSM with the open slots, the tapering of shoe and the notch of stator and rotor cannot apply the tapering is applied to magnet, but the torque density and power factor decrease because the linkage flux by the permanent magnet reduce. Therefore, the thickness of q-axis core and tapering magnet has the trade-off between the performance and torque ripple. In this paper, the characteristic according to the q-axis core thickness and tapering magnet is analyzed based on a finite element analysis (FEA). Furthermore, the optimal design is proposed using the performance map based on the tapering of magnet and q-axis thickness of core. For the design of a basic model, pole-slot combinations are compared with the torque of SIPMSGM according to the current phase angle. Considering the performance, the basic SIPMSGM is selected for the optimal design. Based on the basic SIPMSGM, the optimal design is performed based on the optimal design parameters considering the power factor and torque ripple. IEEE