超磁致伸缩电静液作动器磁场分析与优化

提出一种超磁致伸缩电静液作动器（GMEHA）结构，采用永磁体与控制线圈组合提供驱动磁场.首先建立了该组合磁路数学模型，并给出了超磁致伸缩棒内磁感应强度计算解析式；其次，对以上结构进行了有限元分析（FEA），得出了磁路主要结构参数与磁场分布均匀性之间映射规律；最后进行了作动器磁场试验研究并与有限元分析结果进行了对比，验证了理论与有限元模型的可预测性，给出了该电静液作动器结构设计方法.结果表明:该电静液作动器的最佳驱动频率为250Hz，最大无负载体积流量为0.85L/min，最大阻断力达到了120N. 

Magnetic field analysis and optimization of giant magnetostrictive electro-hydrostatic actuator

A structure of giant magnetostrictive electro-hydrostatic actuator (GMEHA) was designed. The control coil was combined with permanent magnet to provide driving magnetic field. Mathematical model of the magnetic circuit was established, and the analytical calculation of magnetic flux density inside giant magnetostrictive rod was performed. Secondly, finite element analysis (FEA) for the above structurewas conducted, and the mapping principle between the main parameters of the structure and the magnetic field uniformity was got. Finally,the study of actuator magnetic field experiment was conducted, the result of the study was compared with the result of FEA, verifying the predictability of theory and finite element model, then the structure design method of this electro-hydrostatic actuator was presented. Results show that the maximum no-load output volume flow is 0.85 L/min around 250 Hz of the best driving frequency, while the maximum blocked force was close to 120N.