基于车用永磁同步电机转子结构的电磁噪声优化仿真分析OA

Aiming at the high frequency noise obviously similar to"whistle"in the low speed acceleration section of target motor and the principle of motor mass production cost reduction,the passenger car front drive motor with 48 slots and 8 poles of peak power of 62 kW is taken as a case for electromagnetic scheme design.Based on the design index and existing problems,an optimization scheme with the same stator structure and different topological structure of the built-in rotor is designed.The space-time distribution equation of the amplitude waveform of the air-gap magnetic field and the electromagnetic force expression of the two-motor scheme are deduced and calculated.The finite element model and the electromagnetic-structural acoustic field coupling model of the two-motor scheme are established.Based on the simulation results,it is obtained that the optimization scheme weakens the zero-order 6f1 radial electromagnetic force in the low speed acceleration process without sacrificing the electromagnetic performance,and reduces the magnetic steel consumption from 1.474 kg to 1.371 kg to achieve the cost reduction requirement.Finally,a prototype is made for experimental verification.The results show that the optimized scheme significantly weakens the radial vibration at low speed and reduces the 24 times frequency electromagnetic noise,which is consistent with the simulation results.