【摘要】 针对超磁致伸缩材料,设计一种超磁致伸缩微位移驱动器并实现对其控制。在分析超磁致伸缩材料工作特性和超磁致伸缩驱动器工作原理的基础上,确定超磁致伸缩驱动器的结构参数,并应用有限元软件对超磁致伸缩驱动器的机械结构进行电磁场分析,比较无偏置磁场和含偏置磁场下超磁致伸缩材料所处位置的平均磁场强度,验证驱动器机械结构的合理性。同时设计压控电流源,利用基于数字信号处理器的控制器中数模转换电路控制压控电流源,使激励线圈配合偏置线圈产生所需磁场。实验表明,在给定预紧力和偏置磁场条件下,超磁致伸缩材料在2A激励电流下可输出行程为27.1μm,位移精度0.1μm,磁滞回线的平均厚度为3.29μm,验证了超磁致伸缩驱动器结构设计的合理性。更多还原

【Abstract】 The precision displacement structure and controller of giant magnetostrictive actuator is designed based on giant magnetostrictive material. Laying the foundation of the analysis of the operating characteristics of GMM materials as well as the principle of the giant magnetostrictive actuator,the structure of the giant magnetostrictive actuator is analyzed and optimized.Applying finite element software to analyzing the electromagnetic field of the mechanical structure of the giant magnetostrictive actuator according to the structural parameters,the longitudinal average magnetic field intensity is compared to verify compliance with the requirement under different conditions. Controlling the voltage-controlled current source by the digital to analog conversion circuit of the controller which is designed based on the digital signal processor generates the required magnetic field by the excitation coil and the bias coil. Finding the maximum output displacement of the GMM is 27.1μm,the accuracy is 0.01μm and the average thickness of the hysteresis loop is 3.29μm under the condition of certain preload,bias magnetic field as well as 2A exciting current,which verifies the structure and control of the giant magnetostrictive actuator is reasonable更多还原