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针对现有轮毂电机驱动电动车辆非簧载质量增加及路面激励引起的轮毂电机气隙不均匀带来的车辆平顺性和舒适性恶化问题,提出了一种新型内置悬置系统电动轮的拓扑结构方案。此方案通过设置弹性元件将轮毂电机作为一个整体与非簧载质量进行弹性隔离,将电机转化为与簧载质量并联的质量,以此来提高非簧载质量和簧载质量的比值。同时,利用弹性元件吸收路面传递给电机的振动能量,尽量减小路面激励对电机磁隙的影响,达到改善车辆垂向动力学特性的目的。对有、无悬置系统的两种电动轮驱动系统方案进行了垂向动力学特性对比分析。结果表明,设置悬置元件后,车辆车身加速度、轮胎动载荷、悬架动行程及定转子相对位移量方面均有不同程度的改善。由此可见,悬置系统的设置在改善车辆垂向性能方面具有一定效果,对于解决引入轮毂电机后车辆非簧载质量增加的弊端有重要意义,同时为轮毂电机驱动电动汽车的设计提供了可借鉴的结构方案和分析方法。
Aiming at the problem of the deterioration of vehicle ride comfort and comfort caused by the non-sprung mass of the hub-motor driven electric vehicle and the inhomogeneous air gap of the hub motor caused by the road surface excitation, a novel topology of the electric wheel with built-in suspension system is proposed Program. In this scheme, the ratio of the unsprung mass to the sprung mass ratio is increased by setting the elastic element to elastically isolate the hub motor from the unsprung mass as a whole, and transforming the motor into a parallel mass with the sprung mass. At the same time, the elastic elements are used to absorb the vibration energy transmitted to the motor by the road surface and minimize the influence of the road surface excitation on the magnetic gap of the motor, so as to achieve the purpose of improving the vertical dynamic characteristics of the vehicle. The vertical dynamic characteristics of two electric wheel drive systems with and without suspension system were compared and analyzed. The results show that after the suspension element is installed, the vehicle body acceleration, the dynamic load of the tire, the moving stroke of the suspension and the relative displacement of the fixed rotor all have different degrees of improvement. It can be seen that the suspension system has certain effect in improving the vertical performance of the vehicle, which is of great significance to solve the drawbacks that the unsprung mass of the vehicle after the introduction of the hub motor is increased, and provides the design of the hub motor-driven electric vehicle Draw lessons from structural plan and analysis method.