COMPENSATION OF HYSTERESIS IN SOLID-STATE ACTUATORS

In order to control piezoelectric or magnetostrictive solid-state actuators in a hysteresis-free way, the electric or magnetic polarization in the active material must be controlled. The actuating signal is modified by an inverse system so as to show a hysteresis-free, linear transfer characteristic by the concatenation of the inverse system with the actuator. The hysteresis is described by a Preisach model. Measurements of magnetostrictive Terfenol-D demonstrate that almost complete compensation of the flux density/field strength characteristic curve can be obtained.