考虑磁滞的铁稼磁致伸缩位移传感器输出电压模型及结构设计

Output voltage model of Fe-Ga magnetostrictive displacement sensor considering hysteresis and structural design

基于Jiles-Atherton模型、魏德曼效应和压磁效应建立了考虑磁滞影响下磁致伸缩位移传感器的输出电压模型,计算结果与实验结果基本吻合,表明所建立的输出电压模型的正确性.对传统Fe-Ga磁致伸缩位移传感器的结构进行了改进,消除了由磁致伸缩材料的磁滞效应带来的位移迟滞,降低了剩磁和驱动脉冲电流对输出电压的影响,使电压信号的信噪比由14.7 d B提高至27.6 d B.制作了Fe-Ga磁致伸缩位移传感器样机,通过实验验证了新结构能改善传感器的线性度、重复性、迟滞性和精度.基于新的传感器结构,此研究可为磁致伸缩位移传感器的优化、生产提供理论依据和实验基础.

The output voltage computation model of a magnetostrictive displacement sensor was established considering the influence of the hysteresis effect based on the Jiles-Atherton hysteretic model,Wiedemann effect,and piezomagnetic effect. The consistency between the calculated data and experimental data shows the correctness of the output voltage model. The structure of the traditional Fe-Ga magnetostrictive displacement sensor was improved,eliminating displacement measurement hysteresis caused by the hysteresis effect of the magnetostrictive material,thereby reducing the influence of the residual magnetization and the driving pulse current on the output voltage so that the voltage signal-to-noise ratio increased from 14. 7 to 27. 6 d B. A type of Fe-Ca magnetostrictive displacement sensor was fabricated. The experiments show that the new structure can improve the linearity,repeatability,hysteresis,and precision of the magnetostrictive displacement sensor. Based on this new sensor structure,the research provides a theoretical and experimental basis for optimization and manufacture of magnetostrictive displacement sensors.