Abstract: Because the effect of hysteresis and eddy loss, the displacement’s hysteresis loop of giant magnetostrictive actuator with fast response and high reliability is serious. An accurate dynamic model is needed to compensate for hysteresis loop or used for decreasing hysteresis loop by structural optimization. By real time measuring the induced voltage of coil winded on giant magnetostrictive material rod and establishing the equations between the induced voltage and displacement of giant magnetostrictive actuator, a dynamic model which reflects magnetization of giant magnetostrictive rod is presented. And the relationship between the displacement’s hysteresis loop of giant magnetostrictive actuator and its structural parameters is derived. The comparison results of simulation and experiments show the error of peak-to-peak value of displacement is less than 5.8%, when the driving frequency is less than 300 Hz; the conclusion that the displacement’s hysteresis loop can be decreased by increasing preload spring’s stiffness by simulating the relationship between the displacement’s hysteresis loop of giant magnetostrictive actuator and its structural parameters.

Key words: Displacement-sensing model, Eddy loss, Giant magnetostrictive actuator, Hysteresis loop