长线磁致伸缩位移传感器的磁极化强度模型

Magnetic Pole Intensity Model of Magnetostrictive Position Sensor

长线磁致伸缩位移传感器是一种利用磁致伸缩材料的磁致伸缩效应及其逆效应实现位移测量的传感器。运用电磁学和铁磁学相关理论,构建了磁极化强度模型,讨论了该种传感器中扭转式弹性波的产生机理。通过建立有限元模型,使用ANSYS仿真平台进行了激励磁场的仿真模拟。理论模型对仿真结果数据的进一步计算获得了磁致伸缩线体内应力的分布特性。计算结果与实验数据的比较,证明了磁极化强度模型相关理论的合理性。为构建有效的弹性波信号,提高该种传感器检测精度提供了理论依据和实验数据。

The magnetostrictive position sensor is a kind of displacement sensor utilizing the magnetostrictive effect and inverse effect of magnetostrictive material.The generating mechanism and the distribution characteristics of elastic waves within the sensor are discussed.The magnetic pole intensity model of the sensor is constructed and discussed with theory of electromagnetism and ferromagnetism.Applying the numerical value simulation software ANSYS,the impulse torsion magnetic field on the sensor line is emulated.The values of stress distribution within the sensor line are calculated with the data emulated using the theory models established.The comparison of the experiment data and calculated results show that the magnetic pole intensity model is reasonable and feasible.Consequently,the theory basis and experimental data will greatly help to construct valid elastic wave form and promote the quality of the sensor signal.