梯形磁通集聚器的结构设计及磁场分布特性分析

分析了微观尺寸下的梯形磁通集聚结构空气间隙处的轴向磁场放大倍数的影响因素以及磁场分布特性的影响因素。利用有限元方法,仿真分析了梯形结构的几何尺寸和材料属性对其空气间隙处轴向放大倍数的影响,得到梯形集聚结构的设计原则。同时,仿真分析了梯形结构的厚度和空气间隙长度对空气间隙处磁场分布特性的影响,结果表明,空气间隙内y=0和z=0截面上以中心点为标准的均匀度为1%的磁场分布区域占空气间隙区域的比例随着空气间隙变长或结构厚度减小而减小。研究结果能够为梯形磁通集聚器的结构设计及应用提供一定的理论参考。

Design and Magnetic Field Distribution Characteristics of Trapezoid-shaped Flux Concentrator

In this paper, the factors that affect the axial magnetic field amplification at the air gap of trapezoid-shaped flux concentrator at micrometer scale and the magnetic field distribution were investigated. The finite element method was used to analyze the influence of the geometry and the material property of the concentrator on the axial amplification at the air gap. The design principle of the trapezoid-shaped flux concentrator was obtained. Meanwhile, the influence of the thickness and air gap of the concentrator on the magnetic field distribution at the air gap was simulated and analyzed. The results show that the range of the magnetic field distribution area with 1% uniformity at y=0 and z=0 in the air gap becomes less as the air gap becomes wider, or as the thickness of the structure decrease. The research can provide a theoretical reference for the design and application of the trapezoid-shaped magnetic flux concentrator.