Researches of action of pre-stressing caused by external and internal forces on devices based on magnetostrictive bilayer plates

This article presents the results of researches of the static characteristics of displacement devices (through the example of angular displacements) based on magnetostrictive bilayer plates under the action of elastic pre-stressing. We have determined significant influence on the characteristics of preliminary moments caused by both internal and external forces (these having both signs) which are comparable to the moment of the saturation magnetostrictive forces and are even less than the said moment. Significant refinements have been achieved concerning the dependences of the angular displacement of an inertial object on the control current during the action of the preliminary moments of forces. We have determined opportunities for production of actuators based on magnetostrictive plates with an active layer made of permendur, with a significantly higher efficiency (the current consumption is two times less) and linearity of the characteristics under the action of pre-stresses caused by internal or external moments of forces having a certain sign. We have obtained the results of the research of the characteristics during simultaneous action of the moments of internal and external forces at various ratios of the values and signs of the moments. We have also assessed the prospects of this approach for enhancement of the performance of actuators.