Output Characteristics of Fe-Ga Magnetostrictive Displacement Sensor under Torsional Stress
Li Yuanyuan1,2, Wang Bowen1,2, Huang Wenmei1,2, Li Yunkai1,2
1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300130 China; 2. Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology Tianjin 300130 China
Abstract：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.
李媛媛, 王博文, 黄文美, 李云开. 扭转力作用下Fe-Ga磁致伸缩位移传感器的输出特性[J]. 电工技术学报, 2019, 34(21): 4409-4418.
Li Yuanyuan, Wang Bowen, Huang Wenmei, Li Yunkai. Output Characteristics of Fe-Ga Magnetostrictive Displacement Sensor under Torsional Stress. Transactions of China Electrotechnical Society, 2019, 34(21): 4409-4418.
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2019, Vol. 34 
