Positioning element

For the electromechanical actuator two piezoelectric or magnetostrictive expansion joints stretched in a frame are provided as tension and pressure generators. The lift is transmitted to a distance transformer, amplifying the lift, via joint-shaped connecting bars free from play. The distance transformer consists of a two-armed lever, on the arms of which one of the expansion joints or bending elements is acting respectively. The lever, the connecting bars, and a bearing are formed from a homogenous material e.g. by casting. With this device large lifts can be realized with high positioning frequency and high lifting accuracy. (DG)