Abstract: In order to increase the output torque of the permanent magnet synchronous motor, weaken the torque ripple and cogging torque, and improve the operation stability of the motor, a new type of rotor magnetic barrier was designed, and a new type of permanent magnet synchronous motor with new rotor structure (NRS-PMSM) was proposed. On the basis of giving priority to the overall efficiency of the motor, the multi-objective sensitivity analysis method was used, select the key structural parameters that have a significant impact on the output torque, torque ripple, and cogging torque of the motor due to the rotor magnetic barrier, and use genetic algorithm to optimize the structural size parameters to obtain the optimal solution set. The electromagnetic performance of NRS-PMSM, including output torque, torque ripple, and cogging torque, was analyzed and calculated using finite element method. The simulation results showed that NRS-PMSM can increase output torque, weaken torque ripple, and cogging torque.