Yan Jianwu

Design of new microgripper based on GMM

A new type of microgripper based on giant magnetostrictive material(GMM) is presented. Driving force is provided by the expansion and shrinkage of GMM in magnetic field. Output displacement is amplified by using flexibility hinge and leverage structure. Theoretical displacement - current model of the microgripper is established, the prototype is manufactured for experimental performance test and the results show the reliability of the designing method.

Integrated optimized design of GMA with double water-cooling cavums

Giant magnetostrictive actuator(GMA) structure design includes magnetic design and thermal design, and they are relevant. However, current researches are focused on single magnetic design or single thermal design. Based on finite elements analysis, the integrated optimized design method of GMA was proposed to improve the overall performance of GMA. Based on the requirements of magnetic design, the influence of thermal deformation was systematically analyzed. Then a prototype of GMA with double water-cooling cavums was proposed. According to the requirements of precision positioning, the measurement and control system was set up, and pre-pressure, bias current and hysteresis characteristics experiments of GMA were carried out. Then bias conditions and the working stroke of GMA were determined by the experimental results. Finally, positioning accuracy measurement was carried out and its result shows that the positioning accuracy of GMA presented in the paper is better than 0.02µm.