Patent ID: 8847462
Filing Date: 2014-09-30
Classification: F16C,F16D,H02K,Y10T

Abstract:
1. A rotor comprising a rotor shaft defining a rotor axis and a core stack arranged around the rotor shaft along a longitudinal portion of the rotor axis, wherein the rotor shaft defines a first surface region along the longitudinal portion, the first surface region defining a shape of a circular cylinder having a radius r, and a second surface region constituted by structural elements that with respect to the rotor axis rise radially outwardly above the first surface region, wherein the structural elements exhibit a maximal height h with respect to the circular cylinder, and the core stack is provided with a bore for receiving the rotor shaft, wherein the bore exhibits a bore radius that is larger by a small measurement d than the radius r of the circular cylinder, wherein h/3<d<2h/3 and the structural elements extend along the rotor axis over at least one half of the longitudinal portion, wherein when viewed in a section at right angles to the axis of rotation, angular regions that are covered by the first surface region are larger than angular regions that are covered by the second surface region, and when viewed in a section at right angles to the axis of rotation, the angular regions that are covered by the first surface region are at least one and a half times as large as the angular regions that are covered by the second surface region.