Research On Design Of Giant Magnetostrictive Actuator And Its Characteristics In Application

Giant Magnetostrictive Material, which came forth in the middle of last century and is also called GMM, is a new kind of intelligent material. Contrast with the former magnetostrictive materials, it has the following merits: good magnetic retroactivity, rapid response speed, and high energy density. In view of its excellent performance and promising foreground in applications, the research on GMM has become the focus of attention all over the world at a time. Based on the characteristics of the GMM and the requirements in industrial application, this article tends to design a more precise controlled Giant Magnetostrictive Actuator (GMA). The article focus on structure design of GMA, analysis and design of electromagnetic characteristics of power fields, heat deformation controlling and compensating methods, and driving power system which adapts to GMA.On structure design aspect, the closed principle for electromagnetic circuit around the GMM is taken into account, so magnetic leakage is decreased greatly and magnetic intensity around GMM is also improved. Because the length of the power coil designed is longer than that of the GMM pole, magnetic symmetry is kept well and a higher intensity of magnetic field is obtained under the same current. On coil design aspect, optimization design method is put into use to keep higher electromagnetic conversion efficiency. After discussing several methods that can be used to prevent and compensate the deformation caused by the heat from the power coil, we select a better combined measure. With the help of controlling software compensating method, the heat deformation influence on output precision is decreased greatly. On amplificatory power system aspect, based on the characteristic of driving power of GMA and the principle of chopping in high frequency to keep constant current, a good digital controlled driving power using power MOSFET is designed.After analysis and design, the trait of the GMA is tested by experiments using our model machine, including static and dynamic. On base of the data of...