US 12,255,504 B2
Rotor electrical grounding system
Sen Jiang Zhou, Troy, MI (US); Alireza Fatemi, Canton, MI (US); and Jack M Gayney, Grosse Ile, MI (US)
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed by GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed on Aug. 15, 2022, as Appl. No. 17/819,701.
Prior Publication US 2024/0055959 A1, Feb. 15, 2024
Int. Cl. H02K 11/40 (2016.01); H02K 7/00 (2006.01)
CPC H02K 11/40 (2016.01) [H02K 7/003 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An electrical grounding system for an electric machine, the electrical grounding system comprising:
a rotor including a shaft assembly configured to rotate about an axis, the shaft assembly having a surface disposed on a first cone section of the shaft assembly;
a housing supporting the shaft assembly for rotation of the rotor;
a holder extending from the housing; and
a ground assembly concentric with the shaft assembly and held between the holder and the shaft assembly, the ground assembly comprising a bar assembly that includes a head with a second cone section that faces the first cone section, wherein the second cone section is spaced from the first cone section, the ground assembly including a plurality of strands that extend to the surface to ground the shaft assembly to the housing, wherein the strands are fixed in the head and extend from the second cone section to the first cone section in a direction non-perpendicular to the axis.