Giant magnetostrictive actuator (GMA) can be used to produce the micro displacement motion up to order of micrometer scale. While limited to the complicated constitutive model of the Giant magnetostrictive material, it is hard to model and control the GMA system. The study employs the method of system identification, Takes the step response experimental data of GMA as system identification data to determine the system model of GMA, and analyses the credibility of the obtained system identification model. Utilizing the system identification model as the system model, It carries on the PID control for the GMA, meanwhile, it optimizes the parameters of the PID controller based on the GMA performance. The results indicates that The accuracy of GMA with optimal PID controller can be limited to 0.5 mu m, The method of modeling and controlling is instructive for the GMA application which The GMM work in the linear behavior area, the method simplified the controller design and provide the enough accuracy.
