US 12,489,327 B2
Cooled rotor of an electric machine
Christian Gilde, Karlsruhe (DE)
Assigned to Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
Appl. No. 18/023,772
Filed by Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
PCT Filed Jul. 30, 2021, PCT No. PCT/DE2021/100658
§ 371(c)(1), (2) Date Feb. 28, 2023,
PCT Pub. No. WO2022/042792, PCT Pub. Date Mar. 3, 2022.
Claims priority of application No. 102020122523.7 (DE), filed on Aug. 28, 2020.
Prior Publication US 2023/0246501 A1, Aug. 3, 2023
Int. Cl. H02K 1/32 (2006.01); H02K 1/278 (2022.01)
CPC H02K 1/32 (2013.01) [H02K 1/278 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A rotor of a dynamoelectric radial flux machine, the rotor comprising:
a laminated rotor core having individual laminations stacked axially one above the other, wherein all of said individual laminations have a same lamination cross-section;
a plurality of axially extending and circumferentially distributed cooling ducts and a plurality of substantially radially extending inflow ducts arranged within the laminated rotor core;
the laminated rotor core is formed from laminated core sub-units that are rotated relative to one another in a staggered arrangement; and
each of the individual laminations comprises a plurality of cooling-duct holes and a plurality of inflow-duct holes, wherein the plurality of inflow-duct holes in the individual laminations of a first laminated core sub-unit axially overlap with the plurality of cooling-duct holes in the individual laminations of the remaining laminated core sub-units to form the axially extending cooling ducts, wherein the plurality of inflow-duct holes and the plurality of cooling-duct holes are distributed evenly over a circumference of the individual laminations.