Torque Analysis of High Power Density Permanent Magnet Synchronous Machines by Considering Core Reluctance

Abstract

Most torque analysis for permanent magnet synchronous machine (PMSM) are established based on neglecting core reluctance, but due to the high power density PMSM generally works under the condition of high magnetic load, the saturation level in a PMSM is getting severer, which will cause the magnetic conductivity of the core to decrease rapidly, in this case, the core reluctance cannot be ignored. In this paper, a torque analysis method of high power density PMSM considering core reluctance is proposed from the perspective of magnetomotive force (MMF). The conventional torque model is modified to include the influence of core reluctance. Finally, the validity of the analysis approach and torque model is verified by experiment and simulation.