转矩波动下电动轮纵向阶次振动特性及理论分析

Experimental and Theoretical Analysis of Horizontal Order Vibration Characteristics of Electric Wheel Under Torque Ripple

摘要:

针对轮毂电机转矩波动激励引起的电动轮系统振动问题，通过台架试验测得了电动轮运行工况下振动加速度信号，揭示了电动轮系统纵向振动的阶次特征和高频特性.基于电机电磁转矩解析模型从磁场相互作用的角度分析了永磁体磁场非正弦分布和电流谐波对转矩波动的贡献，进而解释了电动轮阶次振动的来源，即电动轮6.0阶振动由永磁体非正弦分布引起；1.0阶振动主要由电流谐波引起；6.5阶振动则由电流谐波和永磁体非正弦分布共同引起.为解释电动轮高频振动现象建立了基于刚性环理论的电动轮动力学模型并进行模态分析，结果表明，电动轮3个共振峰处高频振动分别对应轮胎和车轮同向旋转、反向旋转和纵向平移模态.

Abstract:

In order to study the new electric wheel vibration problems caused by torque ripple, the electric wheel vibrations under working conditions were measured in bench experiment, and order features and highfrequency characteristics of tire horizontal vibration were revealed. Based on analytical model of electromagnetic torque, and considering nonsinusoidal magnetic field distribution and current harmonics, torque ripple features were analyzed from the point of view of magnetic field interaction. Then, the order features of tire vibration were explained by source analysis of torque ripple. The 6th order vibration arises from nonsinusoidal magnetic field distribution while the first order vibration arises from current harmonics, and the 5.0th, 5.5th and 6.5th order vibrations arise from the interaction of nonsinusoidal magnetic field distribution and current harmonics. Based on the rigid ring tire assumption, the dynamics model of electric wheel system was established and modal analysis was conducted.