扭转力作用下Fe-Ga磁致伸缩位移传感器的输出特性  

Output Characteristics of Fe-Ga Magnetostrictive Displacement Sensor under Torsional Stress

作　　者：李媛媛[1,2] 王博文[1,2] 黄文美[1,2] 李云开 Li Yuanyuan;Wang Bowen;Huang Wenmei;Li Yunkai(State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology,Tianjin 300130 China;Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology,Tianjin 300130 China)

机构地区：[1]省部共建电工装备可靠性与智能化国家重点实验室(河北工业大学),天津300130 [2]河北省电磁场与电器可靠性重点实验室(河北工业大学),天津300130

出　　处：《电工技术学报》2019年第21期4409-4418,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金（51777053）;河北省自然科学基金（E2017202035）资助项目

摘　　要：为提高磁致伸缩位移传感器的测量精度,需要从理论和实验上分析传感器的输出特性。针对扭转力作用下波导丝发生磁化状态的改变进而影响传感器的输出特性这一问题,基于材料力学求解扭转应力,并从磁畴角度分析扭转力对魏德曼效应的影响,结合Fe-Ga合金的非线性本构模型和磁致伸缩逆效应等建立磁致伸缩位移传感器的输出电压模型,计算不同螺旋磁场和扭转力下的输出电压。搭建预加扭转应力下输出电压的测试平台,从理论和实验上确定输出电压随扭转应力的增大呈非线性减小的变化规律。研究还表明:在同一磁场下,正向扭转应力导致的电压降小于反向扭转应力导致的电压降,提高偏置磁场或激励磁场可以从一定程度上抵消扭转应力对电压的影响。研究可为设计大量程高精度的位移传感器提供理论依据与指导。In order to improve the measuring accuracy of the magnetostrictive displacement sensor,the output characteristics of the sensor need to be analyzed theoretically and experimentally.Aiming at the problem that the magnetization of the waveguide wire changes with torsional force and affects the output characteristics of the sensor,the torsional stress was solved based on the material mechanics,and the influence of the torsional force on the Weidmann effect was analyzed from the perspective of magnetic domain.According to the nonlinear constitutive model and magnetostrictive inverse effect of the Fe-Ga alloy,the output voltage model of magnetostrictive displacement sensor was established.The output voltages under different helical magnetic fields and torsional forces were calculated,and a test platform of output voltage under pre-applied torsional stress was set up.Thus,the variation law that the output voltage decreases nonlinearly with the increase of torsional stress is determined theoretically and experimentally.It is also shown that the voltage drop caused by forward torsional stress is smaller than that caused by reverse torsional stress under the same magnetic field,and the effect of torsional stress on voltage can be offset to some extent by increasing bias magnetic field or exciting magnetic field.The paper could provide theoretical basis and guidance for designing displacement sensors with large range and high accuracy.

关 键 词：位移传感器 FE-GA 波导丝 扭转应力 螺旋磁场 输出电压 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TH711[自动化与计算机技术—控制科学与工程]