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利用ANSYS有限元软件进行仿真模拟,对超磁致伸缩执行器(GMA,Giant Magnetostrictive Actuator)的磁路结构进行了分析和优化.根据磁致伸缩棒内磁场均匀性好,场外漏磁小的设计目标,利用极性相反的双永磁补偿原理,提出了一种新型的内置式永磁组合偏置结构,使得沿磁致伸缩棒长方向磁场分布均匀的同时,偏置磁场和激励磁场都形成良好的闭合磁路.ANSYS分析结果表明,棒中偏置磁场不均匀度为3.51%,激励磁场不均匀度为8.73%,均满足不均匀度小于10%的设计目标;在执行器指定位置(距离GMA 7cm)的总漏磁场强度为30.4 A/m,符合实际应用的标准要求(<80 A/m).
The magnetic circuit structure of Giant Magnetostrictive Actuator (GMA) was analyzed and optimized by ANSYS finite element software.According to the good magnetic field uniformity in magnetostrictive rod, Design goals, using the principle of double permanent magnet compensation with opposite polarity, a new type of built-in permanent magnet combination bias structure is proposed, which makes the magnetic field distribution along the length of the magnetostrictive rod uniform, and both the bias magnetic field and the excitation magnetic field A good closed magnetic circuit was formed.Analysis of ANSYS showed that the unevenness of the bias magnetic field in the rod was 3.51% and the excitation magnetic field nonuniformity was 8.73%, which all met the design goal that the nonuniformity was less than 10% (GMA 7cm) total leakage magnetic field strength of 30.4 A / m, in line with the practical application of the standard requirements (<80 A / m).