Actuator module having a multi-layer actuator arranged in a housing and a continuously extremely low leakage current at the actuator surface

摘要

The invention relates to actuator module (22) having a piezoceramic multilayer actuator (1) arranged in a casing (23). In order to avoid an increase in conductivity and hence rising leakage current at the actuator surface even after a long period of use, the invention proposes that the casing (23) is hermetically sealed, and a chamber (24) is arranged between the multilayer actuator (1) and the casing (23), which chamber is entirely or partially filled with a medium (21) that chemically transforms and/or binds water.

主权项

1. An actuator module comprising:
a piezoceramic multilayer actuator arranged in a casing, wherein the casing is hermetically sealed, and a chamber is arranged between the multilayer actuator and the casing, which chamber is entirely or partially filled with a medium that chemically transforms water, binds water, or both, wherein the casing has a casing sheath, a casing jacket and a casing base (10, 17) and in the casing (23) electrical receiving terminals (11) for the multilayer actuator (1) are fed into the casing, wherein the casing top is welded onto the casing sheath; wherein the casing base is made of ceramic and has metal-plated apertures into which the electrical terminals are soldered, wherein the casing base comprises metal and the electrical terminals are fed into the inside of the casing via a glass bushing or ceramic bushing in the casing base.