磁性材料的复磁导率测试夹具设计

论文总字数：20374字

摘 要

在设计夹具的过程中，遇到了很多需要解决的问题，主要解决了有以下几个问题：1：在一定程度上，保证被测磁芯与夹具的同轴度问题；2：保证夹具组装过程中的同轴度；3：设计和计算N型接头塑料一端到铜磁芯之间的外导体尺寸；4：设计两套不同尺寸的夹具来解决磁环和夹具之间空隙大小对测试精度产生影响的问题；5：同轴夹具和E5061B矢量网络分析仪的连接问题；6：同轴夹具的固定放置问题。

关键词：同轴夹具；磁导率；电感阻抗法；

Fixture design of Inductance impedance method

Duan Zhao Name

Supervised by Jing Shenhui

Abstract：Magnetic material, Soft magnetic materials, in the inductor, power supply interference filter, a lot of applications. The complex permeability of soft magnetic materials is the main index to evaluate the performance of the soft magnetic materials. The inductive impedance method is one of the methods to measure the complex permeability of soft magnetic materials in the problem of the measurement of the complex permeability of soft magnetic materials in the condition of no current bias and current bias. Which is divided into two kinds, one is need special instrument to measure, the disadvantage is made stringent requirements to be measured the size of the ring; the second is the self-made fixture to measure. Ferrite ring is measured in a short circuit terminal of home made coaxial fixture. At this time this fixture is equivalent of a wound with the inductance of a coil of wire, or with a distribution parameter of the transmission line. Inductance impedance method is a relatively complex permeability by measuring the input impedance of the coaxial fixture to calculate the measured magnetic ring. On the basis of the original fixture, this paper designs a new complex permeability test fixture.

In the process of designing fixture, I met a lot of problems that need to be solved. Mainly solved the following problems.1.To a certain extent, to ensure that the magnetic core and the fixture of the coaxial problem.2 To ensure the coaxial degree of fixture assembly process.3 Design and calculation of the outer conductor dimensions of N type joints.4 The design of two sets of different sizes to solve the size of the gap between the clamp ring and the fixture have influence on the test precision.5 Connection problem of coaxial clamp and E5061B vector network analyzer.6 Fixed placement of coaxial fixture..

Key words: Coaxial clamp；Magnetic permeability；Inductance impedance method；

目 录

摘要……………………………………………………………………………………………… 3

Abstract…………………………………………………………………………………………… 4

目录……………………………………………………………………………………………… 5

第一章 绪论…………………………………………………………………………6

• 1. 选题背景和意义…………………………………………………………………………6
  2. 论文研究的内容和结构安排……………………………………………………………6

第二章 夹具设计的理论基础……………………………………………………………………7

2.1 电磁兼容性及电磁场原理基础理论……………………………………………………7

2.1.1 电磁兼容性概述……………………………………………………………………7

2.2.1 电磁场原理…………………………………………………………………7

2.2 电感阻抗法的测试原理…………………………………………………………….……10

2.2.1 单砸线圈计算模型……………………………………………………………….10

2.2.2 传输线计算模型………………………………………………………………… 12

2.2.3 电感阻抗法可信性分析.………………………………..,……………………13

第三章 夹具的具体设计方案 ………………………………………………………...………...14

3.1 夹具设计的关键问题和难点……………….……………………………………………14

3.1.1 夹具设计中需要解决的问题和难点……………………………………………..14

3.1.2 问题解决方案……………………………………………………………...… .…21

3.2 夹具设计方案…………………………………………………………………...………21

3.3 夹具设计中遇到的问题………………………………………………………………..22

第四章 总结与展望……………………...……………………………………………...………23

致谢……………………………………………………………………………………………24

参考文献………………………………………………………………………………………25

电感阻抗法测量磁导率中的夹具设计

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