PIEZOELECTRICAL BENDING CONVERTER

摘要

The invention relates to a piezoelectrical bending converter (1) with at least one monolithic layered composite (2, 21), comprising a piezoelectric-active ceramic layer (31) with a lateral dimension change (311) which may be generated by application of an electrical field (312) and at least one further piezoelectric-active ceramic layer (32) with a further lateral dimension change (321), different from the lateral dimension change (311). The bending converter is characterised in that an electrode layer (411) is arranged between the ceramic layers, for generation of the electric fields. The layered composite preferably comprises several piezoelectric-active layers and electrode layers arranged between the above. The shift is thus obtained as a gradient of the dimension changes in the direction of the stack (22) of the layered composite. The dimension changes for the ceramic layers and thus the gradient may be adjusted by means of the generation of the electrical fields. In order to achieve a shift it is necessary not to have a piezoelectric-inactive layer. The layered composite is preferably a circular disc bending body (21), with a circular base body. A large shift ratio is obtained by means of arranging several circular disc bending bodies in a stack.