Abstract: The hub motor driven electric vehicle is affected by the double excitation of the unbalanced radial force inside the motor and the external road surface roughness during the driving process, resulting in the coupled characteristics of the hub motor vibration. Aiming at the coupled vibration problem of switched reluctance hub motor under complex road surface excitation, the unbalanced radial force under the mixed eccentricity of the motor was taken as the excitation source alone. Combined with the complex road excitation consisting of random road surface and deterministic impact road surface, the 1/4 vibration system of the vehicle was established to analyze the dynamic responses such as stator acceleration, sprung mass acceleration and tire dynamic deformation. The results show that under the influence of internal and external coupled excitation, the stator acceleration, vehicle body acceleration and tire dynamic deformation will increase exponentially, and resonance is easy to occur near 1.5, 6.5 and 20.0 Hz.

Key words: vehicle engineering; hub motor; unbalanced radial force; complex road surface excitation; coupled vibration

摘要： 轮毂电机驱动电动汽车行驶过程中受电机内部的不平衡径向力与外部的路面不平度双重激励影响，导致轮毂电机振动具有耦合特性。针对复杂路面激励下开关磁阻式轮毂电机耦合振动问题，将电机混合偏心下的不平衡径向力单独作为激励源，结合随机路面及确定性冲击路面构成的复杂路面激励，建立车辆1/4振动系统，对定子加速度、簧载质量加速度和轮胎动变形等动态响应进行分析。结果表明:在内外部耦合激励影响下，定子加速度、车身加速度及轮胎动变形将成倍增加，且在1.5、6.5、20.0 Hz附近易出现共振现象。

关键词: 车辆工程；轮毂电机；不平衡径向力；复杂路面激励；耦合振动