transfer of heat between the stator body 62 which accommodates the stator coils of the stator 36 and the spindle drum 14 in the region of the stator receptacle 60 the spindle tube 38 is in addition supported on the spindle drum 14 via a rear bearing receptacle 70 wherein a bearing ring 72 engages for example in the rear bearing receptacle 70 and accommodates a rear spindle mounting 74 which mounts the spindle tube 38 at a rear end area 76 so as to be rotatable as illustrated in fig3 to 7 the spindle drum 14 is built up at least in the region of the stator receptacle 60 from a plurality of segments 80 a 80 b and 80 c which are cut out from flat material for example from steel plates and stacked in a stacking direction 82 parallel to the spindle drum axis 16 and are connected to one another in a materially joined manner for example by way of soldering in particular hard soldering to form a coherent body the individual segments 80 preferably have plane parallel surfaces 84 and 86 and extend in stacking planes 88 which are at right angles to the stacking direction 82 as also described for example in the european patent application ep 1 414 615 for the purpose of forming the spindle motor receptacle 30 the segments 80 are provided with receiving cutouts 90 which together form the spindle motor receptacle 30 in the direction.