A passive current sensor employing self-biased magnetoelectric transducer and high-permeability nanocrystalline flux concentrator  

作　　者：Ji-Tao Zhang Yu-Mei Wen Ping Li 

机构地区：[1]Research Center of Sensors and Instruments,College of Optoelectronic Engineering,Chongqing University,Chongqing 400044,China [2]Department of Smart Grids and Information Engineering,College of Electric and Information Engineering,Zhengzhou University of Light Industry,Zhengzhou 450002,China

出　　处：《Rare Metals》2022年第7期2343-2348,共6页稀有金属（英文版）

基　　金：financially supported by the National High Technology Research and Development Program of China (No. 2012AA040602);the National Natural Science Foundation of China (No. 61374217)

摘　　要：A passive current sensor,consisting of SmFe_(2)/PZT/SmFe_(2)self-biased magnetoelectric(ME)composite and Fe_(73.5)Cu_(1)Nb_(3)Si_(13.5)B_(9)nanocrystalline flux concentrator for weak current detection at power-line frequency,was fabricated and characterized.Giant magnetostrictive material of SmFe_(2)plate with large anisotropic constant provides a huge internal anisotropic field to bias the ME transducer in closed magnetic loop.Consequently,the additional magnetomotive force induced by the internal field and the corresponding increased effective permeabil-ity contribute to the improvement of the sensitivity.Experimental results demonstrate that the presented sensor has a higher sensitivity of 152 mV·A^(-1)at 50 Hz with a slight nonlinearity of~0.01%full scale(FS)and matches well with the predicted value.This presented current-sensing device exhibits approximately 2.3 times higher sensitivity than that of conventional ME composite with[Pb(Zr_(0.48),Ti_(0.52)O_(3)](PZT)and Terfenol-D plates serving as a key sensitive component.In addition,time stabilities of the presented sensor were evaluated for a long period of 72 h and analyzed through mathematical statistics method,and favorable stabilities with an uncertainty of 0.5μV are obtained in continuous 1 h testing.These results provide a significant advancement toward promising application of the tri-layer self-biased ME laminate for power-line elec-tric cords monitoring.

关 键 词：Magnetoelectric effects Current sensor Magnetic flux concentrator Magnetostrictive rare earth iron alloys 

分 类 号：TB332[一般工业技术—材料科学与工程] TP212[自动化与计算机技术—检测技术与自动化装置] TM933.1[自动化与计算机技术—控制科学与工程]