Improvement of Torque Characteristic of Flux-Concentration-Type Surface Permanent Magnet Motors

Abstract

　This paper presents results of torque characteristic analysis of magnetic flux concentration type surface permanent magnet synchronous motors (CSPMSMs). In this study, we firstly optimized numerically the stator structure to find out suitable number of slots for the conventional 12-pole CSPM rotor by using the finite element method. Then the rotor permanent magnet arrangements were examined in order to improve the torque characteristic. In the optimized model, we achieved larger average torque and smaller cogging torque in comparison with those of the conventional CSPM motor.