Numerical shape design characteristics of torque ripple reduction for Interior Permanent Magnet Synchronous Motor

In this paper, the research on shape design of Interior Permanent Magnet Synchronous Motor (IPMSM) aimed for torque ripple reduction, applied for Hybrid Electric Vehicle (HEV), has been addressed through numerical analysis of non-linear electromagnetic field based on Finite Element Method (FEM). From the initial model with 6-pole, 9-slot, and concentrated winding, numerical design characteristics on torque ripple reduction in accordance with various structural configurations of stator tooth, rotor notch shape, and PM barrier are investigated. Moreover, the designed model which minimizes torque ripple is proposed and its characteristics are validated with comparison of the initial model with respect to Back-EMF Total Harmonics Distortion (THD), radial force density, cogging torque, spatial and time harmonics of torque ripple computed via numerical co-simulation with inverter.