基于巨磁阻的直流電流傳感器的磁屏蔽研究
梁逍1,2,辛守喬1
(1 長春工業(yè)大學(xué) 電氣與電子工程學(xué)院,吉林 長春 130012;
2 三峽新能源海上風(fēng)電運維江蘇有限公司,江蘇 鹽城 224005)
摘 要:由于巨磁阻傳感器對磁場反應(yīng)靈敏,因此鄰近輸電導(dǎo)線的磁場干擾會使巨磁阻傳感器產(chǎn)生測量誤差。為了降低磁場干擾,從理論和數(shù)值計算兩方面對巨磁阻傳感器的磁屏蔽殼進(jìn)行優(yōu)化設(shè)計,提出了一種多層屏蔽的設(shè)計方案。將屏蔽前的測量誤差和屏蔽后的測量誤差進(jìn)行對比發(fā)現(xiàn),采用所提出的屏蔽方案可以較好地降低鄰近傳輸線的磁干擾,提高巨磁阻傳感器的測量精度。
關(guān)鍵詞:巨磁阻;直流電流;干擾;數(shù)值計算;屏蔽
中圖分類號:TP212 文獻(xiàn)標(biāo)識碼:A 文章編號:1007-3175(2021)09-0014-04
Research of Magnetic Shielding Based on GMR Current Sensor
LIANG Xiao1,2, XIN Shou-qiao1
(1 College of Electrical and Electronic Engineering, Changchun University of Technology, Changchun 130012, China;
2 Three Gorges New Energy Offshore Wind Power Operation and Maintenance Jiangsu Co., Ltd, Yancheng 224005, China)
Abstract: The giant magnetic resistance (GMR) sensor has a sensitive reaction to the magnetic field. Because of this, the magnetic field interference of adjacent power transmission wires could cause the GMR sensor to produce measurement error. This paper provides a multi-layer plan base on the theory and numerical calculations to reduce the magnetic field interference to solve this problem.The proposed shielding scheme can better reduce the magnetic interference of adjacent transmission lines and improve the measurement accuracy of the GMR sensor after comparing the measurement error before shielding and the measurement error after shielding.
Key words: giant magnetic resistance; direct current; interference; numerical calculation; shielding
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