电驱动系统耦合建模及动力学特性分析

Coupling Modeling and Dynamic Characteristics Analysis of Electric Drive System

高速化、集成化电驱动系统中存在的NVH问题更加复杂,如:较高的输入转速导致系统固有频率更加密集、局部模态增多;驱动电机的扭矩波动、径向电磁力与齿轮传递误差等多个振动激励源作用下的复杂动态响应;电驱动系统整体变形的强耦合性等因素产生的NVH问题。相较于传统的齿轮传动系统,目前高速化、集成化的电驱动系统新出现NVH问题的重点、难点主要有以下三点:转速逐步提高的高速驱动电机的影响;电机扭矩波动、径向力与齿轮传递误差等多个激励源的影响;考虑系统整体耦合变形的动力学响应分析建模。目前电驱系统减速器高速轴齿传动性能仿真技术正在处于发展阶段,国内外主机厂大部分处于起步阶段,减速器轴齿性能仿真模型精度不高、系统集成度不高、效率低、计算分析结果不够准确。考虑驱动电机结构、齿轮-传动轴-轴承的转子系统以及差速器壳体、电驱动系统箱体等异形部件,搭建电驱动系统刚柔耦合动力学模型,并给出了考虑驱动电机径向力、扭矩波动以及齿轮传递误差等振动激励源作用下的电驱动系统动力学响应的分析方法。

The NVH problem in the high-speed and integrated electric drive system is more complex. For example, more dense natural frequencies and more local modes of the system lead by the higher input speed, and the complex dynamic response under the action of multiple vibration excitation sources such as torque fluctuation of the drive motor, radial electromagnetic force and gear transmission error, the NVH problem caused by the strong coupling of the overall deformation of the electric drive system. Compared with the traditional gear drive system, the new NVH problems in the high-speed and integrated electric drive system mainly include the following three points: the influence of the gradually increasing speed of the high-speed drive motor;The influence of multiple excitation sources such as motor torque fluctuation, radial force and gear transmission error;Dynamic response analysis modeling considering the overall coupling deformation of the system. At present, the simulation technology of high-speed shaft tooth transmission performance of electric drive system reducer is in the development stage, and most main engine manufacturers at home and abroad are in the initial stage. The accuracy of reducer shaft tooth performance simulation model is not high, the system integration is not high, the efficiency is low, and the calculation and analysis results are not accurate enough. Considering the structure of the drive motor, the rotor system of the gear transmission shaft bearing, the differential housing, the box of the electric drive system and other special-shaped components, the rigid flexible coupling dynamic model of the electric drive system is established, and the analysis method of the dynamic response of the electric drive system under the action of vibration excitation sources such as radial force, torque fluctuation and gear transmission error of the drive motor is given.