US 12,328,053 B2
Electric machine with rotor cooling
Thomas Striedelmeyer, Stuttgart (DE)
Assigned to Magna PT B.V. & Co. KG, Untergruppenbach (DE)
Filed by Magna PT B.V. & Co. KG, Untergruppenbach (DE)
Filed on May 2, 2022, as Appl. No. 17/734,241.
Claims priority of application No. 10 2021 204 671.1 (DE), filed on May 7, 2021.
Prior Publication US 2022/0360133 A1, Nov. 10, 2022
Int. Cl. H02K 5/20 (2006.01); H02K 7/04 (2006.01); H02K 9/19 (2006.01); H02K 21/14 (2006.01)
CPC H02K 5/203 (2021.01) [H02K 7/04 (2013.01); H02K 9/19 (2013.01); H02K 21/14 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An electric machine with a stator and rotor,
wherein the rotor includes a rotor laminated core mounted on a shaft,
wherein the shaft includes an oil channel, and
wherein the rotor laminated core include channels parallel to the axis of the shaft and termination plates disposed at opposite ends of the rotor laminated core,
wherein the oil channel includes transverse bores that are arranged on a front side of the electric machine, the transverse bores arranged in planes distanced axially from one another, and the transverse bores supply a first and a second cooling oil path, and
wherein a first plane of the planes runs within a thickness of a balancing disc, wherein the balancing disc is one of the termination plates, and a second plane of the planes runs outside the balancing disc and is disposed in the region of winding heads of the stator,
wherein the second cooling oil path is guided via the oil channel and the transverse bores, wherein oil is sprayed from the channel and the transverse bores, and oil is guided onto a front side of the balancing disc into the channels of the rotor laminated core,
wherein the balancing disc has an inner surface that faces the rotor laminated core and an outer surface that faces away from the rotor laminated core,
wherein the balancing disc has at least one peripheral shoulder,
wherein the at least one peripheral shoulder is defined by a recess formed in the outer surface of the balancing disc,
wherein apertures to the channels in the rotor laminated core are provided in the shoulder along the periphery of the shoulder and conduct the oil impacting against the shoulder axially to the rotor.