Numerical shape design characteristics of torque ripple reduction for interior permanent magnet synchronous motor

In this presentation, research on the shape design of an interior permanent magnet synchronous motor (IPMSM) aimed at torque ripple reduction, applied tor hybrid electric vehicles (HEV), has been addressed through the numerical analysis of a non-linear electromagnetic field based on the finite element method (FEM). From the initial model with 6 poles, 9 slots and concentrated winding, numerical design characteristics on torque ripple reduction in accordance with various structural configurations of stator tooth, rotor notch shape and permanent magnet barrier are investigated. Moreover, a 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 an inverter.