Optimal rotor shape design to reduce the vibration of IPMSM

To decrease cogging torque and operating torque ripple, this paper proposes two improved rotor designs that include a barrier or a notch on the rotor. The optimized designs were determined by the Design of Experiment, and several characteristics, including torque, were considered by FEA Finite Element Analysis. Modal analysis of the stator was performed, and the natural frequency was calculated. The analysis of displacement by the Radial Magnetic Force was considered, and the effects in relation to rotor shape were compared. In addition, the validity of the proposed design was verified through a vibration experiment.