磁致伸缩力传感器输出特性及其影响因素分析

Analysis of Output Characteristics and Influencing Factors of Magnetostrictive Force Sensor

为揭示磁致伸缩力传感器的物理机制,研究了磁致伸缩传感器输出电压与核心元件磁特性的关系。基于磁致伸缩材料的逆磁致伸缩效应,使用片状Fe-Ga和Fe-Co合金设计一种新型的力传感器,根据霍尔效应原理和Jiles-Atherton模型推导了力传感器输出电压模型,通过传感器输出特性测试平台对传感器输出特性进行测试,实验结果表明在偏置磁场6 kA/m、外力2 N时,Fe-Ga合金力传感器的最大输出电压为112 mV;Fe-Co合金力传感器最大输出电压为58 mV,与输出电压模型具有较好的一致性。从物理机制层面上分析磁致伸缩力传感器输出电压的影响因素,确定力传感器的输出电压主要由偏置磁场、外力、以及传感器核心元件磁致伸缩(λ/λs)和M s/λs^1/2决定,并且传感器的输出电压与(λ/λs^2)1/2成正比,与(Ms/λs^1/2)成反比,揭示了磁致伸缩力传感器输出特性的物理机制。

In order to determing the physical mechanism of magnetostrictive force sensor,the relationship between the output voltage of magnetostrictive sensor and the magnetic properties of core components has been studied.Based on the inverse magnetostrictive effect of magnetostrictive materials,a novel force sensor has been designed using sheet-like Fe-Ga and Fe-Co alloys.The force sensor output voltage model has been proposed,based on Hall effect and Jiles-Atherton model.The experimental result has shown that the maximum output voltage of the Fe-Ga alloy force sensor is 112 mV when the bias magnetic field is 6 kA/m and the external force is 2 N.The maximum output voltage of the Fe-Co alloy force sensor is 58 mV,and the experimental result is consistent with calculating one.The influence factors of the output voltage for the magnetostrictive force sensor are analyzed based the physical mechanism.It is found that The output voltage of the force sensor is determined by the bias magnetic field,the external force,and the magnetostriction(λ/λs)and M s/λ^1/2 s of the core components of the force sensor.And the output voltage of the sensor is proportional to(λ/λ2^s)1/2 and inversely proportional to(Ms/λ^1/2 s),revealing the physical mechanism of the output characteristics of the magnetostrictive force sensor.