电机参数对电动车传动系统扭转振动的影响分析

Influence of motor parameters on electric vehicle driveline torsion vibration

针对电动车传动系统存在的扭转振动问题,对传动系统的固有特性、电机的转矩特性及振动系统的动态响应进行了分析研究,提出了综合考虑控制电机动态特性和传动系统的机电耦合仿真方法。首先,建立了某集中式驱动电动车动力传动系统的扭转振动数学模型,分析了系统的固有特性,用实验数据验证了模型的准确性;然后,建立了永磁同步电机的矢量控制模型,分析了驱动电机的转矩特性;最后,基于驱动电机和动力传动系统的机电仿真模型,进行了电机参数的灵敏度分析。研究结果表明:在低频时,引入谐波转矩的各电机参数对动力传动系统扭转振动的影响呈正比关系;在中高频时,电机参数对传动系统的影响不成比例。

Aiming at problem of powertrain torsion vibration of electric vehicle,the inherent characteristics of the driveline,the torque characteristics of the motor and the response of the powertrain were analyzed and studied.An electromechanical coupling simulation method was proposed,considering both the dynamic characteristics of motor and driveline.First of all,the powertrain torsion vibration model was established,inherent characteristic was simulated and tested by experimental data.Then vector control model of permanent magnet synchronous motor(PMSM)was established,and torque characteristic was analyzed.Finally,sensitivity analysis of motor parameters was conducted by establishing electromechanical coupling model of motor and driveline.The results indicate that motor parameters considering torque ripple effect the powertrain vibration characteristics,it has a linear proportion at the low frequency realm,and has nonlinear even inverse proportion at the higher frequency realm.