超磁致伸缩作动器的磁路设计与仿真分析

Magnetic circuit design and simulation analysis of giant magnetostrictive actuator

从超磁致伸缩作动器(GMA)的结构和基本原理入手,通过对偏置磁场和GMM棒的设计,完成GMA的磁路设计。通过Ansys仿真,重点研究作动器外壳材料对磁路的影响以及磁轭材料的磁导率对磁场均匀度的影响。仿真分析结果表明:当采用圆筒形永磁铁来提供偏置磁场时,外壳材料只能选择非导磁材料;增加磁轭材料的相对磁导率,能够增大作动器的磁场强度,提高驱动磁场的均匀度。

Starting from the structure and the basic principles of giant magnetostrictive actuator（ GMA）,through the design of the bias magnetic field and GMA,the magnetic circuit design of GMA is completed. Through simulation analysis by Ansys,the impact of the actuator housing material for the magnetic circuit and the effects of magnetic permeability of the yoke material for the magnetic field uniformity was studied. The simulation analysis showed that： when using a cylindrical permanent magnet to provide a bias magnetic field,the housing material can only select a non-magnetic material; when increasing the relative permeability of the yoke material,the magnetic field strength of actuator can be increased and the uniformity of driving magnetic field can be improved.