电磁-机械激励下电动汽车电驱动系统振动特性分析及优化OA北大核心

To investigate the vibration characteristics of electric drive system under electromagnetic-mechanical excitation,we build a finite element model of permanent magnet synchronous motor so that the electromagnetic characteristics of the motor and the influence of auxiliary groove on the electromagnetic torque pulsation of the motor are explored.On this basis,a multi-flexed-body dynamics model of the electric drive system,comprised of the motor,the transmission system,and the shell assembly,is built to analyze the vibration characteristics of the shell assembly of the electric drive system under electromagnetic and mechanical excitation.Vibration characteristics of the shell assembly of the electric drive system under electromagnetic and mechanical excitation are analyzed.Finally,the influence of stator and rotor slotting structure parameters on the vibration characteristics of the electric drive system is investigated.Througha parameter sensitivity analysis,the stator slot width,rotor slot width and rotor slot spacing are selected as the optimization parameters to build the Kriging response surface model,and the multi-objective optimization of the auxiliary slot parameters of the motor is conducted.Our results show the 24th and 48th order electromagnetic excitation of the motor contributes more to the system vibration,and the frequency domain amplitude of the vibration acceleration decreases by 32.8%,56.6%,and 57.3%at 24f,fz1 and 48f respectively after optimization.