US 12,451,781 B2
Hybrid excited rotary machine
Alireza Fatemi, Canton, MI (US); Alan G. Holmes, Clarkston, MI (US); Shawn H. Swales, Canton, MI (US); Mazharul Chowdhury, Canton, MI (US); Muhammad Hussain Alvi, Troy, MI (US); Peng Peng, Columbus, OH (US); and Thomas W. Nehl, Shelby 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 Jun. 16, 2023, as Appl. No. 18/336,202.
Prior Publication US 2024/0421681 A1, Dec. 19, 2024
Int. Cl. H02K 21/04 (2006.01); B60L 53/22 (2019.01); H02K 1/22 (2006.01); H02K 1/27 (2022.01); H02K 21/46 (2006.01)
CPC H02K 21/042 (2013.01) [B60L 53/22 (2019.02); B60L 2210/40 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An electric machine, comprising:
a stator; and
a rotor core surrounded by the stator and rotatable about an axis, the rotor core having axially opposite ends and a plurality of slots, each slot extending through the rotor core between the axially opposite ends and containing at least one respective electrical conductor and at least one respective permanent magnet, wherein the electrical conductors are radially inboard relative to the permanent magnets and extend beyond the axially opposite ends of the rotor core,
wherein the at least one respective permanent magnet contained within each slot comprises a respective first magnet and a respective second magnet, wherein the first magnets are intermediate the second magnets and the electrical conductors, and
wherein the respective first magnet and the respective second magnet have at least one of a temperature rating and a coercivity that are different from one another,
wherein the electrical conductors comprise conductive bars,
wherein an annular end ring assembly at one end of the rotor core containing a first terminal conductor galvanically coupled to a first subset of the conductive bars and a second terminal conductor galvanically coupled to a second subset of the conductive bars, and
wherein the annular end ring assembly further contains a secondary coil of a rotary transformer.