US 11,722,043 B2
Synchronous machine having hybrid rotor excitation
Alireza Fatemi, Canton, MI (US); Shawn H. Swales, Canton, MI (US); Mohammad F. Momen, Rochester Hills, MI (US); and Derek F. Lahr, Howell, MI (US)
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed by GM Global Technology Operations LLC, Detroit, MI (US)
Filed on Sep. 30, 2020, as Appl. No. 17/38,757.
Prior Publication US 2022/0103049 A1, Mar. 31, 2022
Int. Cl. H02K 21/04 (2006.01); H02K 1/276 (2022.01); H02K 21/14 (2006.01); H02K 1/2706 (2022.01)
CPC H02K 21/042 (2013.01) [H02K 1/2706 (2013.01); H02K 1/2766 (2013.01); H02K 21/046 (2013.01); H02K 21/14 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An electric machine, comprising:
a rotor having an outer surface, an inner surface opposite of the outer surface, and a rotor body defined between the outer surface and the inner surface;
a plurality of permanent magnets embedded within the rotor body, wherein at least one of the plurality of permanent magnets produces a constant magnet field having a magnetic axis along a direct axis (D-axis); and
a plurality of excitable electromagnets embedded within the rotor body, wherein at least one of the plurality of excitable electromagnets, when excited, produces a variable magnetic field having a magnetic axis offset from the D-axis; and
wherein the plurality of permanent magnets includes an inner pair of permanent magnets arranged in a V-shape configuration and spaced from one of the plurality of excitable electromagnets by a rotor air-gap.