主动悬架直线电机温升-电磁特性分析与优化设计OA北大核心CSTPCD

To improve the performance of the linear motor in the active suspension system,this paper analyzes the characteristics of a cylindrical permanent magnet synchronous linear motor and optimizes its structure.First,a multi-body dynamics model is built for the active suspension system of an SUV,simulating and determining the overall design parameters and initial structural schemes of the motor.Second,a finite element method is employed to build a temperature rise model for the linear motor,considering material thermal property variations.The temperature rise distribution under different driving speeds is analyzed,along with its impact on the electromagnetic characteristics of the linear motor.Our results show the temperature rise directly affects motor thrust and winding losses.Lowering the temperature helps reduce winding losses but increases thrust fluctuation.Based on the magnetic-thermal coupling analysis,with unloaded positioning force and winding temperature rise as optimization objectives,a parameter sensitivity analysis is conducted.The response surface method is then employed to perform multi-objective optimization of the linear motor's structural parameters.The optimization results indicate the unloaded positioning force is down by 7.5％,the winding losses is down by 17.5％,the winding temperature rise is down by 11.02％,and there is a significant improvement in motor performance compared with the data before optimization.Finally,a prototype of the permanent magnet synchronous linear motor is produced for bench testing with experimental and simulation errors both within 5％,validating our simulation results.