Stator-segmented surface-mounted permanent magnet synchronous motors (SPMSM) usually have high torque pulsations

which generate the vibration and noise and affect the high-performance output of the motor. In order to optimize the performance of the motor

the effects of the radially sinusoidalized and axially sinusoidalized permanent magnets on the cogging torque and electromagnetic torque of the motor are analyzed via finite element simulation. The occupation factor k is proposed to control the spatial structure of radial (or axial) sinusoidalized permanent magnets

and when k keeps changing

the shape of radial (or axial) sinusoidalized permanent magnets also keeps changing

which produces the different optimization effects on the motor cogging torque and electromagnetic torque. The optimized value of k is found. On the basis

a bidirectional sinusoidalized hybrid permanent magnet model is proposed

and the contribution of the shape of the new hybrid permanent magnet to the motor performances is simulated by using the finite element method

which shows that the new hybrid permanent magnet has the better suppression effects on the cogging torque fluctuation and electromagnetic torque pulsation compared with the optimized radial (or axial) sinusoidalized permanent magnet. Finally

the experimental verification of the new permanent magnet synchronous motor confirms that the present permanent magnet has the good optimization effect on the cogging torque and electromagnetic torque

and comparing with the original model

the cogging torque amplitude reduced by 0.16 Nm

and the electromagnetic torque pulsation reduced by 19.6%.