基于Terfenol材料的大位移微驱动器研究与开发

　　基于Terfenol材料的大位移微驱动器研究与开发
　　The new type of functional material and the working principle are unceasingly used to improve precision driving and its control technology As a new type of functional material which has been developed in recent years, rare earth-iron giant magnetostrictive materials has many advantages, such as large magnetostriction strain, high coupling coefficient, quick response, high energy density and so on, which make it have good application future in fields of precision driving and microdisplacement. Based on the new type of functional material, this paper uses new principles and approaches to study this kind of microdisplacement actuator and its precision driving system. A new way and train Block neodymium magnet of thoughts are provided to study the new type, high property microdisplacement actuator and its precision control system.
　　The main study content of this paper is as follows:Starting with causing mechanism of magnetostriction, this paper analyses and discuss the relationship of physical properties of magnetic crystal, Meanwhile, the characteristics of giant magnetostrictive, such as lengthen and shorten, magnetic-mechanical coupling, pressure stress, temperature and so on, are a little more systematically analyzed and elaborated, and corresponding curves and representations are given. The theory foundation is settled for highly effectively and rationally using giant magnetostrictive material.Based on the character of the giant magnetostrictive materials and the basic structure of the actuator, the paper calculated and designed the magnetic path, electric-magnetic structure, pre-pressure mechanism, temperature controlling system, then analyzed the character of the actuator in the software ANSYS and optimized the structure. Analyzed and calculated the dynamics character of the flexure hinges, designed a http://www.chinamagnets.biz two-stage symmetric displacement magnifying mechanism with flexure hinges, the maximal allowed input displacement was calculated and the displacement loss of the mechanism was analyzed. The software ANSYS was used to calculate the relationship of the exterior force and input displacement.After theoretic analysis and the structure design of the precision driving system, tested the character of the system, including the character of magnetic, output displacement, pre-pressure, temperature, hysteresis; and also test the character of the displacement magnifying mechanism.Analyzed hysteresis causing of the giant magnetostrictive materials ,compared several kinds of nonlinear models of hysteresis. Deduced the Preisach model of the giant magnetostrictive actuator, established the experimental model and tested it. Researched the open-loop precision positioning control of the actuator based on the Preisach model.