In order to solve the problems of large torque ripple and insufficient torque of permanent magnet auxiliary synchronous reluctance motor (PMSM), the structure of PMSM with magnetic pole deflection was proposed and multi-objective optimization was carried out. In order to select the best structural parameters of the motor, the finite element method was used for simulation analysis of the motor, combined with two-dimensional contour method, the initial optimization range of the motor structural parameters was selected. The initial parameters optimization orthogonal table was established by using Taguchi method, combined with the 8-pole 48-slot motor structure designed, the data in the orthogonal table were modeled and simulated, and then the motor structure parameters were optimized and adjusted. According to the proposed scheme, an experimental prototype was designed and developed. The results show that the structural torque of the optimized magnetic pole deflection motor is increased by 8.1%, and the torque pulsation is decreased by 5.6%. The experimental results verify the rationality of the proposed motor structure.