摘要
针对现阶段常用磁传感器对弱磁场测量灵敏度低的问题,利用软磁材料具备对外磁场集聚放大的特性,通过在磁传感器外部的磁通集聚结构以提高磁测系统的灵敏度。利用ANSYS软件重点分析了T形、斜线形以及条状磁通集聚结构的轴向、横向磁场放大特性并通过实验进行验证。磁力线在磁通集聚结构内部流动的过程中发生了磁通泄漏现象,三种结构中T形磁通集聚结构对外部磁场的放大效果最好,放大倍数达21倍左右。通过对三种结构的线性工作范围进行测试,得到斜线形磁通集聚结构线性工作范围比T形磁通集聚结构线性工作范围大51%。磁传感器外加磁通集聚结构能明显提高对弱磁场的测量精度。
Aiming at the problem that weak magnetic field measurement of magnetic sensors with low sensitivity at present,magnetic sensors made of soft magnetic materials which have characteristics of concentrating and amplifying magnetic field are attached outside magnetic flux concentration structure in order to improve the sensitivity of magnetic system. ANSYS software is used to analysis magnetic field amplification characteristics of magnetic flux concentration structure with T-shaped,oblique and strip in axial and transverse,then results are verified by experiments. Leakage of magnetic flux occurs in the process that magnetic line of force flows in the magnetic flux concentration structure. Magnetic flux concentration structure with T shaped magnify the external magnetic field best in these structures. It can reach 21 times than before. After the linear operating range of three kinds of structures are tested,linear operating range of magnetic flux concentration structure with oblique is more 51% than magnetic flux concentration structure with T shaped. The measurement accuracy of the weak magnetic field can be improved after magnetic flux concentration structure attached to magnetic sensors.
出处
《科学技术与工程》
北大核心
2015年第35期6-10,共5页
Science Technology and Engineering
基金
国家自然科学基金(51375463)资助
关键词
磁通集聚
磁场
放大特性
线性工作范围
magnetic flux concentration
magnetic field
amplification characteristics
linear operating range
