In a drive device having a tubular linear motor with a stator (1), an armature (2) and a bottom flange (30), the stator (1) is arranged on the bottom flange (30) in thermal contact with the bottom flange (30). The stator (1) is fluid-tightly enclosed by stainless steel. The bottom flange (30) consists at least partly of a material having a higher thermal conductivity than stainless steel. The stator (1), together with the bottom flange (30), is enclosed by a casing (40) made of stainless steel which is in thermal contact with the bottom flange (30) and encloses the bottom flange (30) and the stator (1) in common. The stator (1) is a tubular stator (1) having drive coils (12) arranged therein and also having a longitudinal axis and a through-hole (11) which extends through the tubular stator (1) coaxially with the longitudinal axis. The armature (2) has a fluid-tight armature tube (21) made of stainless steel, in which permanent magnets (23) are arranged, and is arranged so as to be movable relative to the tubular stator (1) in the through-hole (11) in the direction of the longitudinal axis. The tubular stator (1) and the bottom flange (30) are so arranged relative to one another that a portion of the tubular stator (1) is in thermal contact with the bottom flange (30).