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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.
A giant magnetostrictive electrohydraulic actuator (GMEHA) structure is proposed, in which the driving magnetic field is provided by a combination of a permanent magnet and a control coil.First, the mathematical model of the combined magnetic circuit is established and the magnetic induction of the giant magnetostrictive rod Then the finite element analysis (FEA) is applied to the above structure, and the mapping law between the main structural parameters of the magnetic circuit and the uniformity of the magnetic field distribution is obtained. Finally, the magnetic field of the actuator is studied and compared with the finite element The results of which are compared to verify the predictability of the theory and the finite element model.The structure design method of the electrohydraulic actuator is given.The results show that the optimal driving frequency of the electrohydraulic actuator is 250Hz, The maximum no-load volume flow of 0.85L / min, the maximum blocking force reached 120N.