Stellantrieb und Verfahren zum Entwärmen eines in einem Stellantrieb mit einem Stellglied eingehausten Festkörperaktors

The invention relates to an actuating drive for deflecting an actuating element (15) by means of a solid body actuator (2) which, when an electrical voltage or an alternating magnetic field is changed, experiences a length change, wherein a housing (1) encloses the solid body actuator and, together with the latter, delimits an interspace (13) in a fluid-tight manner. Furthermore, the solid body actuator has a hollow duct (6), the first end of which is connected to a first hollow conduit (20) passing through the housing, and the other end of which opens into the interspace. The interspace is additionally connected in a fluid-tight manner to a second hollow conduit (21) passing through the housing.