Fe-Ga-Al磁致伸缩致动器输出特性研究

Output properties of Fe-Ga-Al magnetostrictive actuator

将采用定向凝固方法制备的Fe82Ga9Al9合金磁致伸缩棒应用于制作Fe-Ga-Al磁致伸缩致动器，对该致动器进行了输出位移相关性能的测试与研究．测试结果表明输出位移与电流变化关系曲线的斜率随着预应力的增大而减小．同时，根据Fe-Ga-Al磁致伸缩致动器最大输出位移与预应力的变化关系，可以看出当致动器预压应力在0-25MPa范围内，其最大输出位移由10-3μm增至15．8μm．与Terfenol—D超磁致伸缩致动器相比，Fe82Ga9Al9合金饱和磁场非常低，因此测量结果显示该致动器具有所需驱动电流小、输出位移与驱动电流之间线性度好的优点．

The directional solidification Fe82Ga9Al9 alloy was prepared via a directional solidification furnace. The new magnetostrictive actuator was designed and made with the directional solidification Fe82Ga9Al9 alloy rod. The measuring results indicate that the gradient of the curve for the achieved axial displacement versus electrical current decreases with increasing pre-stress. The maximum axial displacement of the actuator increases by 53% from 10.3tam, up to 15.8 lain with the compressive pre-stress increase from 0MPa to 25MPa. The investigation to the Fe-Ga-Al magnetostrictive actuator indicates its output displacement has good linearity at low magnetic field. Compared with Terfenol-D giant magnetostrictive actuator, the Fe-Ga-Al magnetostrictive actuator has better precisio.