US 12,470,116 B2
Rotor, electric motor and method for reducing the unbalance of a rotor
Patrick Wisbar, Rastatt (DE); Alexandre Fischer, Strasbourg (FR); and Thomas Fritz, Malsch (DE)
Assigned to Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
Appl. No. 17/641,601
Filed by Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
PCT Filed Aug. 25, 2020, PCT No. PCT/DE2020/100748
§ 371(c)(1), (2) Date Mar. 9, 2022,
PCT Pub. No. WO2021/047726, PCT Pub. Date Mar. 18, 2021.
Claims priority of application No. 10 2019 124 186.3 (DE), filed on Sep. 10, 2019.
Prior Publication US 2022/0320978 A1, Oct. 6, 2022
Int. Cl. H02K 15/165 (2025.01); H02K 1/276 (2022.01); H02K 1/28 (2006.01)
CPC H02K 15/165 (2013.01) [H02K 1/276 (2013.01); H02K 1/28 (2013.01); H02K 2213/03 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A rotor for an electric motor, the rotor comprising:
a laminated rotor core which is rotatable about a rotation axis, having a first rotor lamination and a second rotor lamination arranged axially next to the first rotor lamination and with a plurality of magnet cutouts, in each of which magnets are arranged and secured, wherein each rotor lamination includes a plurality of circumferentially distributed cutouts at least partially coextensive along a common circumference, and the circumferentially distributed cutouts each have a cutout volume and are formed separately from the magnet cutouts, wherein at least a first cutout of the plurality of circumferentially distributed cutouts has a different shape but the same cutout volume as the plurality of circumferentially distributed cutouts, wherein the second rotor lamination is aligned rotated relative to the first rotor lamination so that the respective first cutouts are offset.