Optimal design of flux-barrier to improve torque performance of IPMSM for electric spindle

This paper presents an optimal design of interior permanent magnet synchronous machine (IPMSM) for electric spindle considering the flux-barrier shape. Four types of flux-barrier are discussed and compared to improve torque performance, which includes the average torque, torque ripple and cogging torque. The design process is accomplished by using finite element method (FEM). Moreover, the Taguchi method is taken into practice in this paper as a proposed optimal method. The simulation results will be theoretically discussed and analyzed. Finally, prototype machines are being fabricated, and the validity of the proposed design will be confirmed by experiments.