磁致伸缩作动器结构优化设计  

Optimum Design of the Magnetostrictive Actuator

作　　者：张旭辉[1,2,3] 刘永光[3] 付永领[3] 

机构地区：[1]中国电力科学研究院,北京100192 [2]北京国电富通科技发展有限责任公司,北京100070 [3]北京航空航天大学自动化科学与电气工程学院,北京100083

出　　处：《压电与声光》2009年第3期377-380,共4页Piezoelectrics & Acoustooptics

摘　　要：根据电磁学原理,在对磁致伸缩作动器内部磁路分析的基础上,推导出了作动器输出位移与Terfenol-D棒及上下端盖的尺寸之间的关系,并以此为根据对作动器结构进行优化设计,以使其在充分发挥Terfenol-D棒性能的前提下结构更加紧凑。由于Terfenol-D棒和上下端盖、作动器内壁组成了闭合磁路,使螺线管端部的磁场分布情况得到了明显改善,同时考虑到温升对作动器输出位移的影响,采用热膨胀抵消补偿法降低了温度对作动器输出位移的影响,从而最大限度地消除了作动器输出非线性。另外,为了消除作动器中磁场对周围器件的干扰,对作动器采取了磁屏蔽措施,通过有限元软件ansys仿真表明,该作动器内部磁场较均匀,而外部漏磁几乎为零,实现了预期效果。Based on the electromagnetism principles, the relationship between the actuatorrs output and Terfenol- D rod as well as the top and bottom end plate was deduced. Then optimization was made to minimize the size of the actuator without losing performance. The distribution of magnetic field in the magnetic coils have improved attributing to the closed magnetic flux path,which is composed by the Terfenol-D rod, the top end plate, the bottom end plate and the internal wall of actuator. Similarly, the affection of the temperature was eliminated by the compensation of the thermal expansion,so that the nonlinearity of the actuatorls output was minimized. At last a non-magnetizer shield was introduced to house the actuator which can protect other equipments from the effect of the actuatorrs magnetic field. The finite element analysis simulation with the software of ansys showed that the internal magnetic field of the actuator was uniform and the out magnet leakage was almost zero.

关 键 词：作动器 磁致伸缩材料 非线性 结构优化 热变形 有限元分析 

分 类 号：TP211.4[自动化与计算机技术—检测技术与自动化装置]