科研之友
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摘要
In view of the problem of the deterioration of vehicle ride comfort caused by the increased unsprung mass of motor-in-wheel drive electric vehicle and hence the uneven air gap of motor due to road excitation, a novel topological scheme of motor-in-wheel structure with built-in mount system is proposed. With the scheme, the in-wheel motor is separated elastically from unsprung mass by rubber bushing, transferring the mass of motor to be parallel to sprung mass. In addition, the rubber bushing also absorbs the vibration energy transferred from road to motor, reducing the effects of road excitation on motor air gap and hence improving vertical dynamic characteristics of vehicle. After the model for the new type of motor-in-wheel electric vehicle is built and the effects of mount system parameters on vehicle vertical dynamic characteristics is analyzed, the vertical characteristics of motor-in-wheel drive schemes with and without built-in mount system are compared. The results show that with the rubber bushings installed, the acceleration of sprung mass, the dynamic load of tire, the dynamic travel of suspension and the relative displacement between stator and rotor all have different degrees of improvement.
