基于COMSOL的超磁致伸缩作动器磁路仿真及优化

Magnetic Circuit Simulation and Optimization of Giant Magnetostrictive Actuator Based on COMSOL

提出一种超磁致伸缩作动器(GMA)结构,使用激励线圈与永磁体组合的方式提供驱动磁场。基于电磁学原理,首先建立了磁路的数学模型,然后使用COMSOL Multiphysics软件建立了GMA的有限元模型,分析了内部磁路开闭路以及导磁材料的相对磁导率对超磁致伸缩材料(GMM)棒中心线上的磁感应强度及均匀度的影响,同时以GMM棒中心线上的磁感应强度及均匀度作为评价指标,对上导磁体结构进行了优化设计。仿真结果表明,内部磁路闭合及适当增大导磁材料相对磁导率能够有效提高GMM棒中心线上的磁感应强度。上导磁体结构优化后,GMM棒中心线上的磁感应强度最终增加了0.18 T,均匀度提升至92%。

A giant magnetostrictive actuator(GMA)structure is proposed,which uses a combination of excitation coil and permanent magnet to provide a driving field.Based on the principle of electromagnetism,the mathematical model of magnetic circuit was first established,and then the finite element model of GMA was established by using COMSOl Multiphysics software.The influence of the open and closed circuit of internal magnetic circuit and the relative permeability of magnetic conductivity material on the magnetic induction intensity and uniformity of the center line of the giant magnetostrictive material(GMM)rod was analyzed.At the same time,the structure of the upper magnetic guide was optimized by taking the magnetic induction intensity and uniformity of the center line of GMM rod as indexes.The simulation results show that the magnetic induction intensity of GMM centerline can be effectively improved by closing the internal magnetic circuit and appropriately increasing the relative permeability of magnetic materials.After optimizing the structure of the upper magnetic conductor,the magnetic induction intensity on the center line of GMM rod is finally increased by 0.18 T,and the uniformity is increased to 92%.