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提高磁致伸缩驱动器驱动效率的关键环节是建立优化的驱动器磁路。本文基于准静态条件下线性磁致伸缩理论,得出磁致应变S与磁致伸缩材料内部磁场强度B的关系;并根据对无永磁磁偏磁路的分析进一步得出磁致应变S与磁路磁阻R和漏磁磁阻R1的对应关系。应用有限元方法对3种典型磁路结构的磁化效果进行对比分析,验证磁路结构的变化——即磁阻R和漏磁磁阻R1的相应改变对磁致伸缩材料磁化程度的不同影响,进而得出微小驱动器磁路壳体适宜壁厚为2mm,导磁材料的磁导率为2000μ0。根据此结果和磁路设计的2个遵循原则,对一7mm×20mmTerfenolD棒驱动的驱动器进行了磁路设计,应用ANSYS验证了该结构设计的合理性,并试制了驱动器样机。
The key to increasing the drive efficiency of a magnetostrictive actuator is to create an optimized drive magnet. Based on the linear magnetostriction theory under quasi-static conditions, the relationship between the magnetostriction S and the magnetic field strength B within the magnetostrictive material is obtained. Based on the analysis of the non-permanent magnetic bias circuit, the relationship between magnetostriction S and The relationship between the magnetic resistance R and the magnetic leakage resistance. The magnetization effects of three kinds of typical magnetic circuit structures were compared by finite element method to verify the changes of the magnetic circuit structure - that is, the different influences of the reluctance R and the leakage magnetic reluctance R1 on the magnetization degree of the magnetostrictive material, And then come to the micro-drive magnetic circuit shell suitable wall thickness of 2mm, the permeability of the magnetic material is 2000μ0. According to the results and the two principles of magnetic circuit design, a 7mm × 20mmTerfenolD rod drive actuator magnetic circuit design, the application of ANSYS verify the rationality of the structure design, and trial prototype driver.