基于稀土超磁致伸缩材料的微致动器设计

Design of a Micro-displacement Actuator Based on Giant Magnetostrictive Material

选择 Terfenol- D作为微致动器主要材料 ,采用弹簧对 GMM棒施加一定的预压力以获得较大的磁致伸缩应变 ,采用偏置磁场消除 GMM棒的倍频现象并使之工作在线性段 ,对磁路进行了分析和优化设计。针对电磁线圈工作发热及涡流损耗引起的 GMM棒温升 。

Giant magnetostrictive material (GMM) is a special smart material and Terfenol D is an example of this material. When placed GMM in a magnetic field aligned with material magnetostrictive axis, it will expand quickly and forcefully. A giant magnetostritive actuator shows a great potential due to its high force and short reaction time in applications, such as active vibration control system, machine tools and aeronautics. Based on the characteristics of a giant magnetostrictive material, the design of an actuator is presented in this paper. A special attention is paid to magnetic and mechanical design aspects to improve the performance of an actuator. Furthermore, In order to keep the GMM temperature at constant, a temperature control system was developed.