烟台职业学院学报

为分析偏心故障下永磁电动轮垂向耦合振动特性，依据改进的复数相对磁导理论和有限元分析方法，建立永磁轮毂电机磁场预测模型，得到不同静偏心程度下径向和切向气隙磁场分布。其次，根据Maxwell应力张量方程，给出偏心故障下轮毂电机不平衡电磁力时空分布及幅频特性。在此基础上，依据永磁电动轮振动传递路径，建立耦合振动动力学模型，分析不同偏心程度下定转子振动响应行为。结果表明，在静偏心故障下，轮毂电机所产生的不平衡电磁力会导致电机定转子剧烈振动，其幅值会随着偏心程度的增加逐渐增强，进而导致轮毂电机产生碰磨问题，影响电动轮运行稳定性。

To analyze the vertical coupled vibration characteristics of permanent magnet electric wheels under eccentric fault conditions, a magnetic field prediction model for permanent magnet hub motors is established based on an improved complex relative permeability theory and finite element analysis. The radial and tangential air-gap magnetic field distributions under different degrees of static eccentricity are obtained. Subsequently, according to the Maxwell stress tensor equation, the spatiotemporal distribution and amplitude-frequency characteristics of unbalanced electromagnetic forces in hub motors under eccentric faults are derived. On this basis, a coupled vibration dynamic model is constructed according to the vibration transmission path of the permanent magnet electric wheel, and the vibration response behaviors of the stator and rotor under different eccentricity levels are analyzed. The results show that, under static eccentric fault conditions, the unbalanced electromagnetic forces generated by the hub motor lead to severe stator-rotor vibrations, with vibration amplitudes increasing progressively as the degree of eccentricity increases. This may further cause rotor-stator rubbing, thereby adversely affecting the operational stability of the electric wheel.