support for example back plate interface 17 support point 21 or bearing interface 23 the advantage of next insert 34 as an extension of stator carrier section 12 is that in particular the attachment to wheel bearing 22 is made more rigid and more stable than in a plastic embodiment like the specific embodiment in fig7 this is because of on the one hand the material properties of metal in particular steel and on the other hand because metal is more aging resistant than plastic and does not have a tendency to creep fig3 shows a three dimensional view of cooling device 26 cooling device 26 has cooling jacket section 28 which is formed by 3 to 4 rows of cooling coils 31 which wind around main axis of rotation 1 in particular in the form of a coiled spring or spiral inflow outflow section 29 which is formed by further lines which are laid so that the desired areas of stator carrier section 12 and or electronics receiving section 13 are cooled is located on the side facing toward stator carrier section 12 for example inflow outflow section 29 includes a cooling plate which is located in a radial plane in relation to main axis of.