Electric motor designed to allow a better removal of the heat generated when it is operating

Abstract

The invention relates to an electric motor () comprising a rotor () mounted on a shaft (), a stator () positioned around the rotor (), the stator () comprising a body formed by a stack of laminations () and winding overhangs () projecting axially from each side of the stator body, a front bearing () and a rear bearing () which are connected to one another, the front and rear bearings () forming an internal cavity in which the rotor () and the stator () are housed, wherein the rear bearing () is bell-shaped and covers a cylindrical part () of the front bearing () extending axially from an end wall () of the front bearing (), the rear bearing () forming, with the front bearing (), an internal duct () for the circulation of a first cooling fluid inside which duct a first cooling fluid circulates, the first cooling circuit entering the internal duct () via a first fluid-inlet duct () formed radially through the rear bearing () and exiting the internal duct () via a first fluid-outlet duct () formed radially through the rear bearing (), characterized in that the front bearing () has a projecting rib () extending radially towards an internal face () of the rear bearing (), said rib () acting as a separator for the internal duct (), the first fluid-inlet and fluid outlet ducts () opening respectively on each side of the rib (), and in that the electric motor () is additionally cooled by a second cooling fluid circulating through the stack of laminations () of the stator () and over the winding overhangs () of the stator (), the second cooling fluid being supplied via at least a second fluid-inlet duct (), the at least one second fluid-inlet duct () being at least partially formed through the rib () of the front bearing ().