Research On Rare Earth Giant Magnetostrictive Micro-Displacement Driving System

The research theme of this dissertation is the giant magnetostrictive micro-displacement actuator(GMA) system. Combined with the project of National Natural Science Foundation of China-"Research on Theory and Supporting Technology of Bionics Vibration Isolation System for Precision Equipment" (No.50075078), the characteristic and theory of GMA have been studied deeply and systematically both in theoretical analysis and experimental study. The dissertation consist of six chapters:In chapter 1, the background and significance of the research are introduced, the principle and the current research situations of the micro-displacement actuator, especially of GMA, are explained, and the study contents of this dissertation are proposed.In chapter 2, the characteristic and mechanism of GMM are introduced. The driving principle of GMA is analyzed, and a kind of micro-displacement GMA is manufactured. Regarding of the variety of winding's resistance while GMA is working, a steady-current power is designed, simulated and experimented. At last, the range of work frequency of GMA is given by theoretical analysis and compute.In chapter 3, the characteristic of relation between magnetic field and displacement is studied, and the constitute form of work magnetic field is analyzed. Based on software ANSYS, distribution of magnetic field and request of work current are given. The result shows that the strength of magnetic field is even in the area of GMM, and that GMM works in linear range.In chapter 4, the characteristic model of GMA is established, two kinds of control ways have been analyzed and compared, and the PID arithmetic is disused based on current control way. Then the control model of system is constructed, and the hardware and software of control system is designed. Finally, based on Visual C++, control software is programmed.In chapter 5, in order to get the characteristic of relation between magnetic field and displacement when GMM is working under different pressure, between magnetic field and displacement, between magnetic field and force, and the characteristic of precise displacement output of GMA, some experiments have been done. At last, an application based on GMA is discussed.In chapter 6, all achievements of the dissertation are summarized and the further research work, which will be done from now on, is put forward.