US 12,424,892 B2
Stabilized core assembly for carbon fiber sleeved electric motor rotor
Anthony Michael Coppola, Rochester Hills, MI (US); Derek Frei Lahr, Ann Arbor, MI (US); Alireza Fatemi, Canton, MI (US); Erik Brandon Golm, Sterling Heights, MI (US); Alan G. Holmes, Clarkston, MI (US); and Michael B. Viola, Macomb Township, MI (US)
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed by GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed on Jan. 24, 2023, as Appl. No. 18/100,896.
Prior Publication US 2024/0250569 A1, Jul. 25, 2024
Int. Cl. H02K 1/276 (2022.01); H02K 1/04 (2006.01); H02K 1/27 (2022.01); H02K 1/30 (2006.01); H02K 15/12 (2025.01)
CPC H02K 1/30 (2013.01) [H02K 1/04 (2013.01); H02K 1/27 (2013.01); H02K 2201/09 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A rotor core assembly for an electric motor, the rotor core assembly comprising:
a plurality of laminations secured together;
a center bore defined by the plurality of laminations, a longitudinal axis of the rotor core assembly extends along an axial center of the center bore;
a carbon fiber sleeve surrounding the plurality of laminations;
an outer polymeric coating on outer surfaces of the plurality of laminations between the plurality of laminations and the carbon fiber sleeve;
magnet slots defined by the plurality of laminations, the magnet slots extending parallel to the longitudinal axis;
magnets seated in the magnet slots;
reinforcing bores defined by, and extending across, the plurality of laminations; and
reinforcing members seated in the reinforcing bores.