TMR传感器阵列抗干扰测量电流新方法  

New method for anti-interference measuring current with TMR sensor array

作　　者：武新章 樊珂 李深旺 孟志杰 郭平辉 张冬冬 WU Xinzhang;FAN Ke;LI Shenwang;MENG Zhijie;GUO Pinghui;ZHANG Dongdong(School of Computer,Electronics and Information,Guangxi University,Nanning 530004,China;School of Electrical Engineering,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学计算机与电子信息学院,广西南宁530004 [2]广西大学电气工程学院,广西南宁530004

出　　处：《传感器与微系统》2024年第6期113-116,共4页Transducer and Microsystem Technologies

基　　金：国家自然科学基金资助项目(5210071288);广西科技基地人才专项资助(2021AC19120)。

摘　　要：隧道磁阻(TMR)传感器测量电流时易被其他磁场干扰,导致测量失准。为了解决这个问题,本文提出了一种三传感器阵列设计。通过对磁场表达式进行空间离散傅里叶变换,建立超越方程组求解测量电流。对该方法进行了数学建模、数值模拟实验、有限元分析和实验分析。实验结果表明:当测量电流为100 A、干扰电流为700 A时,数值模拟的最大误差为2.98×10^(-15);有限元分析阵列各种角度下的最大误差小于1%;在80 A的量程范围内,实验分析的最大误差为2.02%。这验证了该方法的有效性。Tunnel magnetoresistance(TMR)sensors is easily interfered by other magnetic fields when measuring current,resulting in measurement inaccuracy.To solve this problem,a three-sensor array design is proposed.By performing a spatially discrete Fourier transform on the magnetic field expression,transcendental equation group is established to solve the measurement current.The method is mathematically modeled,numerically simulated,finite element analysis and experimental analysis.Experimental results show that when the measurement current is 100 A and the interference current is 700 A,the maximum error of numerical simulation is 2.98×10-15,and the maximum error of the finite element analysis array at various angles is less than 1%.In the range of 80 A,the maximum error of the experimental analysis is 2.02%.This verifies the effectiveness of the method.

关 键 词：电流测量 隧道磁阻效应 传感器阵列 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]