US 12,451,765 B2
Cooling rotary electric machines
Xiaofeng Yang, Troy, MI (US); Peng Peng, Columbus, OH (US); and Farzad Samie, Franklin, MI (US)
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed by GM Global Technology Operations LLC, Detroit, MI (US)
Filed on May 10, 2023, as Appl. No. 18/314,927.
Prior Publication US 2024/0380279 A1, Nov. 14, 2024
Int. Cl. H02K 9/19 (2006.01); H02K 1/20 (2006.01); H02K 1/32 (2006.01); H02K 21/14 (2006.01)
CPC H02K 9/19 (2013.01) [H02K 1/20 (2013.01); H02K 1/32 (2013.01); H02K 21/14 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for cooling a rotary electric machine having a stator, a rotor and an air gap therebetween, comprising:
injecting a pressurized liquid into the air gap through at least one of the rotor and the stator; and
injecting a pressurized gas into the air gap through at least one of the rotor and the stator,
wherein the pressurized liquid and the pressurized gas are provided simultaneously as a pre-mixed two-phase fluid by a two-phase pump, and
wherein a mixture of the pressurized liquid and the pressurized gas is established within the air gap and the pressurized gas dilutes the mixture sufficiently to force the pressurized liquid and the pressurized gas against the rotor and stator and through the air gap to exit the air gap at axially opposite ends of the rotary electric machine.