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为了能精确地测试和评定微构件的力学特性 ,需研制微拉伸装置。本文对电磁 -线圈力驱动器的结构和参数进行了优化设计 ,并将其应用于微拉伸装置。结果表明 ,由于磁场梯度与线圈的激励电流成线性关系 ,因而能进行精确的控制。在设计微拉伸装置时 ,样品的一端附在由叶片弹簧悬挂的可移动拉杆上 ,另一端固定。通过线圈激励产生的磁场对拉杆上的磁铁作用 ,施加拉力。利用光纤传感器测量位移。最后 ,采用内径 a1=0 .0 0 8m,匝数 n= 12 80 0的线圈 ,可得到作用于磁铁的力与电流的关系为 ΔF/ΔI=0 .50 3± 0 .0 1m N/m A。
In order to accurately test and evaluate the mechanical properties of micro-components, the need to develop micro-stretching device. In this paper, the structure and parameters of the electromagnet-coil actuator are optimized and applied to the micro-stretching device. The results show that precise control is possible because the magnetic field gradient is linear with the coil’s excitation current. In designing the micro-stretching device, one end of the sample is attached to a movable rod suspended by a leaf spring and the other end is fixed. The magnetic field generated by the coil excitation exerts a pull on the magnet on the tie bar. Using optical fiber sensors to measure displacement. Finally, using a coil with an inner diameter of a1 = 0.080m and a number of turns of n = 1280 0, the force and current acting on the magnet can be obtained as ΔF / ΔI = 0 .50 3 ± 0 .01 mN / m A.