Patent ID: 9621010
Date: 2017-04-11
CPC Classifications: H02K

Claim:
1. A rotating electric machine ( 1 ) comprising a stator ( 4 ) disposed in a housing ( 2 ) and a rotor ( 10 ) rotatably supported by a shaft ( 6 ) about an axis of rotation ( 8 ), wherein the housing ( 2 ) has a circumferential wall ( 12 ) and two axially opposing first and second end walls ( 14 , 16 ) formed as bearing flanges having rotating-element bearings ( 18 ) for the shaft ( 6 ), and wherein an inner and an outer cooling fan impeller ( 20 , 22 ) are connected to the shaft ( 6 ), the inner cooling fan impeller ( 20 ) disposed inside the housing ( 2 ), which inner cooling fan impeller ( 20 ) upon rotation generates an inner cooling air circuit (A) inside the housing ( 2 ), and the outer cooling fan impeller ( 22 ) disposed outside the housing ( 2 ), which upon rotation generates an outer cooling air flow (B) flowing over the housing ( 2 ), wherein the first end wall ( 14 ) disposed on the side of the outer cooling fan impeller ( 22 ) has an outer cooling rib geometry ( 28 ) on an outer side facing towards the outer cooling fan impeller ( 22 ) as well as an inner cooling rib geometry ( 30 ) on an opposing inner side, wherein the outer cooling fan impeller ( 22 ) is formed as a radial impeller with radial blades ( 32 ), wherein on the first end wall ( 14 ) a cap-like cover ( 33 ) is fitted, overlapping the cooling rib geometry ( 28 ) of which first end wall ( 14 ) and the cooling fan impeller ( 22 ), which has a central air inlet opening ( 38 ) in a cap wall ( 34 ) perpendicular to the axis of rotation ( 8 ) and circumferentially surrounds the first end wall ( 14 ) with an axial circumferential edge ( 36 ) extending from the cap wall ( 34 ), wherein the outer cooling fan impeller ( 22 ) in connection with the cover ( 33 ) is formed such that upon rotation, air drawn in axially through the air inlet opening ( 38 ) of the cover ( 33 ) flows radially outward through the outer cooling rib geometry ( 28 ) and is redirected in an axial direction in the radial outer region over the cover ( 33 ) and flows outward over the housing circumferential wall ( 12 ), the first end wall ( and the outer cooling rib geometry ( 28 ) of the first end wall ( 14 ) is formed in a radially inner region of the first end wall ( 14 ), which region is covered upon rotation by the outer cooling fan impeller ( 22 ), of cooling projections ( 44 ) projecting axially up to the vicinity of the outer cooling fan impeller ( 22 ), and formed, in a radially outer region of the first end wall ( 14 ), which radially outer region is adjacent to the region of rotation of the outer cooling fan impeller ( 22 ), from the cooling projections ( 46 ) projecting axially up to the cover ( 33 ), and formed, in a radially outer region of the first end wall ( 14 ) from wing-shaped axially and radially oriented rib projections which lie in the inner transition region between the cap wall ( 34 ) and the circumferential edge ( 36 ) of the cover ( 33 ).