An electric motor (1) is provided, preferably an internal rotor motor, having a housing (3) which is enclosed on all sides, except for a bushing for a drive shaft (2). A stator (5) is arranged in the housing, and is connected to a wall (3a) of the housing (3) in a thermally-conductive manner, wherein, externally to the wall (3a), a plurality of projections (6) are provided, which are oriented essentially parallel to the drive shaft (2), and wherein, externally to the housing (3), a fan wheel (8) is arranged on the drive shaft (2), the vanes (8a) of which, upon a rotation of the drive shaft (2), considered longitudinally to said drive shaft (2), pass over at least one region, in which region the projections (6) are arranged, such that a cooling air stream (KLS) is generated along the projections (6).