US 12,407,201 B2
Rotor for an electric machine
Cheng Gong, Troy, 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. 19, 2022, as Appl. No. 17/578,534.
Prior Publication US 2023/0231428 A1, Jul. 20, 2023
Int. Cl. H02K 1/276 (2022.01); H02K 5/16 (2006.01); H02K 15/03 (2025.01)
CPC H02K 1/276 (2013.01) [H02K 5/16 (2013.01); H02K 15/03 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A laminate plate for a rotor of an interior permanent magnet (IPM) electric machine, comprising:
a disk-shaped plate defining a plurality of elongated apertures;
wherein each of the elongated apertures has a first side and a second side forming opposed first and second sides, and a first end and a second end forming opposed first and second ends;
wherein the first end is disposed towards an axis of rotation of the disk-shaped plate, and wherein the second end is disposed towards an outer periphery of the disk-shaped plate;
wherein the second end includes a corner portion and a load bearing portion;
wherein the load bearing portion is arranged perpendicular to the first side;
wherein the corner portion has an edge that defines a void area that is recessed into the first side;
wherein the edge includes a convex portion having a first radius R1 arranged in series with a concave portion having a second radius R2, and wherein the first radius R1 is greater than the second radius R2;
wherein the convex portion is connected to the first side;
wherein the concave portion is connected to the load bearing portion of the second end; and
wherein the edge minimizes a stress concentration in the corner portion that is induced by centrifugal force when the rotor is rotating in the IPM electric machine.