超磁致伸缩换能器磁路设计及优化

Magnet circuit design and optimization of giant magnetostrictive transducer

为优化超磁致伸缩换能器的电磁性能,研究了线圈的几何尺寸和磁路元件的选择对换能器磁场特性和输出位移的影响,并进行了磁路损耗和气隙磁导分析.给出了合理的线圈结构参数,提出了在超磁致伸缩材料(GMM)棒两端安装高磁导率的软磁体和减少GMM棒涡流损耗的设计方案,并忽略了气隙的影响.采用有限元方法仿真了不同磁路设计方案对换能器性能的影响,并进行了试验分析.结果表明,在GMM棒两端安装电工软铁能够提高工作磁场强度,减少磁通泄漏,增加换能器输出位移并降低驱动电流,改善换能器的发热情况,从而整体改善超磁致伸缩换能器的性能.

To optimize the electromagnetic performance of giant magnetostrie tive transducer, the effects of coil＇s geometry and magnetic circuit components on the transducer＇ s magnetic field characteristics and displacement output were studied, and the magnetic circuit＇s loss and the gap＇s magnetic permeability were also analyzed. The appropriate coil structure parameters were presented, and an optimized design scheme was proposed in which pure iron with high magnetic permeability was attached to both ends of the giant magnetostrictive material （GMM） to reduce loss. Both finite element simulation and experimental analysis were conducted to study the effects of different magnet circuit design schemes on the transducer＇s performance. The results indicate that attaching pure iron to both ends of the GMM can enhance the working magnetic field, reduce the magnetic flux leakage, and increase the displacement output with reduced current in coil, thus improve the thermal condition of the transducer.