轮毂开关磁阻电机电磁特性负效应及其抑制

Negative Effects and Suppression of Electromagnetic Characteristics of Hub Switched Reluctance Motor

针对轮毂电机气隙偏心导致电磁力失衡和转矩波动增大,影响车辆行驶稳定性的问题,首先,利用傅里叶函数推导开关磁阻电机电感、磁链、径向电磁力和转矩关于电流和转子位置角度的关系曲线,其次,基于麦克斯韦应力张量法分析2种运行工况下电磁力和转矩的空间电磁特性,结果表明,气隙偏心导致偏心位置处的电磁力和转矩失衡,然后,通过灵敏度分析确定结构参数贡献权重,制定多目标优化方案,最后,借助第二代非支配排序遗传算法(NSGA-Ⅱ)对结构参数进行多目标寻优,筛选2组优化方案,其中最优方案C1对各优化目标均实现了较大改善,有效提高了轮毂电机驱动车辆的纵、横向稳定性。

Hub motor air gap eccentricity leads to electromagnetic force imbalance and torque fluctuation increase affecting the vehicle driving stability.To solve this problem,firstly,the Fourier function was used to derive the relationship curves of inductance,magnetic chain,radial electromagnetic force and torque of the switched reluctance motor concerning the current and angle,and then,the spatial electromagnetic characteristics of the electromagnetic force and torque were analyzed based on Maxwell’s stress tensor method in the two operating conditions.The results show that the air gap eccentricity leads to the imbalance of electromagnetic force and torque at the eccentric position.Then,the contribution weights of structural parameters were determined by sensitivity analysis,and a multi-objective optimization scheme was formulated,finally,the multi-objective optimization search of structural parameters was carried out with the help of NSGA-Ⅱ,and two groups of optimization schemes were screened,of which the optimal scheme C1 improves the optimization results greatly,and the longitudinal and transverse stability of the wheel-hub motor-driven automobile is improved efficiently.