Patent ID: 8816547
Filing Date: 2014-08-26
Classification: H02K,Y02E

Abstract:
1. An electric machine, comprising: an inner stator comprising: a plurality of stator windings; and a stator lamination at least partially encasing the plurality of stator windings, wherein the stator lamination is at least partially formed as fins that project radially inwardly from the stator lamination; an outer rotor; and a closed cooling channel through which a gaseous cooling medium circulates, the closed cooling channel being disposed radially inside the stator lamination and extending all along a circumferential length of the stator lamination, wherein the closed cooling channel is delimited by the stator lamination such that the closed cooling channel is isolated from an air gap between the inner stator and the outer rotor, whereby the gaseous cooling medium is prevented from flowing into the air gap.