超磁致伸缩力传感执行器磁路优化设计与分析

Optimal design and analysis of magnetic circuit for giant magnetostrictive force sensing actuator

以超磁致伸缩力传感执行器为研究对象,基于磁致伸缩与涡流损耗理论,应用COMSOL有限元软件进行磁场分析,系统地研究了导磁体参数对磁通密度与涡流的影响规律。为增大磁通密度、减小涡流损耗,以超磁致伸缩棒中轴线上磁通密度均匀度为评价标准,优化了导磁体参数,并将导磁体分区绝缘。静、动态磁场下与未优化时实验结果进行对比,结果表明:静磁场中优化后的磁通密度均值提升了0.0161T,均匀度提升了4.5%;动态磁场中,分区绝缘可有效减少涡流损耗,优化后的力传感器灵敏度提升了5.76%。

Taking the giant magnetostrictive force sensing actuator as the research object,based on the theory of magnetostriction and eddy current loss,the COMSOL finite element software is used for magnetic field analysis,and the influence law of the parameters of the magnetizer on the magnetic flux density and eddy current is systematically studied.In order to increase the magnetic flux density and reduce the eddy current loss,the uniformity of the magnetic flux density on the central axis of the giant magnetostrictive rod is used as the evaluation standard,and the parameters of the magnetizer is optimized and it is partitioned and insulated.Comparing the experimental results under static and dynamic magnetic fields with those without optimization,result shows that the mean value of optimized magnetic flux density in the static magnetic field is increased by 0.0161 T,and the uniformity is increased by 4.5%;in a dynamic magnetic field,partitioned insulation can effectively reduce eddy current loss,and the sensitivity of the optimized force sensor is increased by 5.76%.