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基于现有轮毂电机和轮辋刚性连接的电动轮结构形式,结合轮毂电机转矩波动激励和电动轮系统纵扭耦合振动模型揭示了轮胎和电机纵向振动问题,并确定了系统纵向振动所对应的主要参与模态,指出由于对振动主导的两阶旋转模态频率相距较大,电动轮系统在电机工作范围内整体振动特性较差。针对上述问题,采用轮毂电机和轮辋弹性连接的结构形式以规划电动轮系统模态特征。分析表明弹性连接能够降低电动轮系统两阶旋转模态频率并使二者相互靠近,进而能够缩短使电动轮系统产生共振的敏感电机转速范围,从而改善系统整体振动特性。最后通过连接参数对振动特性的影响分析确定了能够实现减振效果的弹性连接参数合理取值范围,为电动轮系统采用弹性连接构型进行优化设计提供了参考。
Based on the structure of the electric wheel with rigid connection between the hub motor and the rims, the longitudinal vibration of the tire and the motor is revealed by the excitation of the torque fluctuation of the hub motor and the coupled longitudinal and torsional vibration model of the electric wheel system. The main longitudinal vibration corresponding to the system It is pointed out that the overall vibration characteristics of the electric wheel system in the operating range of the motor are poor due to the large frequency separation of the two-order rotational mode dominated by the vibration. In view of the above problems, the structure of elastic connection between the hub motor and the rim is adopted to plan the modal characteristics of the electric wheel system. The analysis shows that the elastic connection can reduce the second-order rotational mode frequency of the electric wheel system and bring them close to each other, which can shorten the range of the sensitive motor speed that resonates the electric wheel system and improve the overall vibration characteristics of the system. Finally, the influence of the connection parameters on the vibration characteristics is analyzed to determine the reasonable value range of the elastic connection parameters that can achieve the damping effect, which provides a reference for the optimal design of the electric wheel system using the elastic connection configuration.