Patent ID: 11936239
Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A rotor for an electric machine, comprising:
a rotor portion defining a plurality of slots; and
a plurality of bi-material permanent magnets each positioned in one of the plurality of slots, at least one bi-material permanent magnet including:
a core including a first magnetic material and defining one or more cooling channels formed in the first magnetic material; and
a shell portion located on the core and made of a second magnetic material,

wherein the one or more cooling channels extend within the bi-material permanent magnet from one side of the core to an opposite side of the core and are enclosed by the shell portion of the bi-material permanent magnet,
wherein the first magnetic material comprises a magnet material with an energy less than 20 Mega Gauss Oersteds (MGOe), and
wherein the second magnetic material comprises a magnet material with an energy greater than 30 MGOe.