US 12,438,419 B2
Electric motor designed to allow a better removal of the heat generated when it is operating
Cédric Ledieu, Mont Saint Eloi (FR); and Maxime Balligand, Harnes (FR)
Assigned to NOVARES FRANCE, Velizy-Villacoublay (FR)
Appl. No. 18/286,628
Filed by NOVARES FRANCE, Velizy-Villacoublay (FR)
PCT Filed Apr. 7, 2022, PCT No. PCT/FR2022/050652
§ 371(c)(1), (2) Date Oct. 12, 2023,
PCT Pub. No. WO2022/219269, PCT Pub. Date Oct. 20, 2022.
Claims priority of application No. 21/03896 (FR), filed on Apr. 15, 2021.
Prior Publication US 2024/0380283 A1, Nov. 14, 2024
Int. Cl. H02K 9/197 (2006.01); H02K 5/173 (2006.01); H02K 5/20 (2006.01)
CPC H02K 9/197 (2013.01) [H02K 5/1732 (2013.01); H02K 5/203 (2021.01)] 9 Claims
OG exemplary drawing
 
1. An electric motor comprising
a rotor mounted on a shaft,
a stator disposed around the rotor,
said stator comprising a body formed by a lamination stack and winding heads projecting axially on either side of the body of the stator, a front bearing and a rear bearing connected to each other,
said front and rear bearings forming an inner cavity in which the rotor and the stator are housed, in which the rear bearing is bell-shaped and covers a cylindrical part of the front bearing extending axially from an end wall of said front bearing,
the rear bearing forming with the front bearing an inner channel for the circulation of a first cooling fluid inside which a first cooling fluid circulates,
said first cooling fluid penetrating inside the inner channel via a first fluid inlet channel formed radially through the rear bearing and exiting the inner channel via a first fluid outlet channel formed radially through the rear bearing,
wherein the front bearing has a projecting rib extending radially towards an inner face of the rear bearing, said rib forming a separator for the inner channel, the said first fluid inlet and outlet channels emerging respectively on either side of the said rib, and
wherein the electric motor is also cooled by a second cooling fluid circulating in the lamination stack of the stator and on the winding heads of the stator, said second cooling fluid being supplied through at least one second fluid inlet channel, said at least one second fluid inlet channel being at least partially formed through the rib of the front bearing.