Research on Electromagnetic Excitation Force Weakening of PMSM Based on Stator Auxiliary Slot
Electromagnetic vibration noise is the main source of motor noise,which directly affects the NVH performance of motor,and the radial electromagnetic force is the main cause of electromagnetic vibration noise.Aiming at the problem that the low order radial electromagnetic force of 9-slot 6-pole motor generates large vibration and noise,firstly,the expression of radial electromagnetic force was analyzed based on Max-well stress equation.It was pointed out that the opening of stator armature slot changes the lowest non-zero order of radial electromagnetic force.The method of opening auxiliary slots at the top of stator teeth was pro-posed,and the influence of different slot number and slot size on the air gap permeability was studied.The effects of different slotting methods on the low order radial electromagnetic force and the cogging torque were studied.Based on this,a reasonable slotting scheme was determined and the optimal grooving parameters of the motor were obtained by multi-objective algorithm.The results show that for fractional slot permanent mag-net motor,the stator opening auxiliary slot can effectively reduce the no-load low-order electromagnetic exci-tation force of the motor.
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