新型双段Halbach阵列轴向永磁联轴器的多目标优化

Multi-objective optimization of axial magnetic couplings with two-segment Halbach array

为了解决传统双段Halbach轴向永磁联轴器转矩性能较低的问题,提出一种新型双段Halbach轴向永磁联轴器,并以转矩性能为优化目标进行多目标优化。采用3D有限元法对新型双段HAMC进行建模,主要分析新型阵列的每个关键参数对新型双段HAMC转矩和转矩密度的影响。通过参数分析,发现转矩和转矩密度不能同时达到最优,需要对提出的新型双段HAMC进行多目标优化,则建立转矩和转矩密度的多项式回归模型和非支配排序遗传算法Ⅱ,以获得转矩和转矩密度的极大值。优化之后的新型双段HAMC,转矩提高了5.60%,转矩密度提高了4.19%。通过气隙磁密与转矩性能分析,进一步验证了新型结构的合理性和多目标优化方法的有效性。

In order to solve the problem of low torque performance of the axial magnetic couplings with traditional two-segment Halbach array(HAMC),the axial magnetic couplings with two-segment Halbach array is proposed,and the multi-objective optimization algorithm is used to improve torque performance of the two-segment HAMC.The two-segment HAMC was modeled by the 3D finite element method,and the influence of each key parameter of the array on the torque and torque density of the two-segment HAMC was mainly analyzed.Through parametric study,it is found that torque and torque density can not reach the optimal simultaneously.Then the proposed two-segment HAMC was optimized using the polynomial regression model of torque and torque density and the non-dominated sorting genetic algorithm II(NSGA II)to obtain both relative maximum of torque and torque density.The output torque of the optimized two-segment HAMC was increased by 5.60%and the torque density was increased by 4.19%.The rationality of the structure and the effectiveness of the multi-objective optimization algorithm are further verified through the analysis of air gap magnetic density and torque performance.