<p>This paper investigates the multi-factor collaborative suppression methods for torque ripple in high-speed permanent magnet synchronous motors. Firstly, build the model of the motor based on the structural parameters of the motor. Subsequently, analyze the electromagnetic performance of the motor. Secondly, the mechanism and influencing factors of torque ripple are analyzed by performing a Fourier decomposition of the air gap magnetic field considering slot effect. Then, multi-factors are selected as optimized variables to suppress torque ripple. Thirdly, based on the results of finite element simulation(FEM), the relationship between the structure and size parameters of the stator slots and the torque ripple is analyzed. Suppression of torque ripple is realized by modifying the stator slots and stator teeth. Finally, the method can effectively suppress torque ripple in high-speed permanent magnet synchronous motors. It is of great significance for improving the efficiency and reliability for further study.</p>