Aktor mit Aktorglied

摘要

The invention relates to an actuator (10b), in particular a pneumatic cylinder comprising an actuating member (14b) that can be displaced in a displacement chamber (12) of a housing (13b) until it reaches an end stop (27) and can be displaced away from said end stop (27), a microwave position measuring device (50) for determining the position of the actuating member in the displacement chamber (12) by means of microwaves (54), a microwave antenna assembly (51) for emitting microwaves into the displacement chamber (12) that forms a waveguide (56) and for receiving reflected microwaves (55) formed by the reflection of the emitted microwaves by the actuating member (14b) from the displacement chamber (12). The actuator is characterised in that the microwave antenna assembly (51) projects beyond the end stop (27) towards the actuating member (14b).