Piezoelectrical bending converter

US7336022B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Carsten Schuh · Baldham, DE
• Thorsten Steinkopff · Eglharting, DE
• Andreas Wolff · Munich, DE

Key dates

• Filing date: Jun 14, 2002
• Grant date: Feb 26, 2008
• Expiry date: Jul 1, 2022

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10N30/204

Abstract

Piezoelectrical bending converter with at least one monolithic layered composite, includes a piezoelectric-active ceramic layer with a lateral dimension change which may be generated by application of an electrical field and at least one further piezoelectric-active ceramic layer with a further lateral dimension change, different from the lateral dimension change. An electrode layer 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 of the layered composite. The dimension changes for the ceramic layers and the gradient may be adjusted by the generation of the electrical fields. In order to achieve a shift it is necessary not to have a piezoelectric-inactive layer.