US 12,451,742 B2
Method and apparatus for cooling a rotor assembly
Balamurugan Sridharan, Bengaluru (IN); Anirban Chatterjee, Bengaluru (IN); and Sarveshwar Chandrakant Wadgaonkar, Bengaluru (IN)
Assigned to GE AVIATION SYSTEMS LLC, Grand Rapids, MI (US)
Filed by GE AVIATION SYSTEMS LLC, Grand Rapids, MI (US)
Filed on Aug. 9, 2022, as Appl. No. 17/883,655.
Claims priority of application No. 202211023026 (IN), filed on Apr. 19, 2022.
Prior Publication US 2023/0336043 A1, Oct. 19, 2023
Int. Cl. H02K 1/32 (2006.01); H02K 9/19 (2006.01)
CPC H02K 1/32 (2013.01) [H02K 9/19 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A rotor assembly for an electric machine comprising:
a rotor core defining a set of circumferentially-spaced, axially-extending slots thereon;
a set of rotor windings disposed within the slots having an axial winding portion extending axially along the rotor core, and defining a set of rotor winding end turns extending axially beyond the rotor core to define an overhang with upper and lower surfaces, connected by an end;
a coil containment collar coupled to the rotor core, the coil containment collar comprising:
a first wall member confronting the rotor core;
a second wall member axially spaced from and opposing the first wall member;
a third wall member extending from the first wall member to the second wall member defining a set of first apertures therethrough;
a first cavity cooperatively defined by the first wall member, second wall member, and third wall member such that one side of the first cavity comprises at least a portion of the second wall member, the first cavity having a first opening opposing the third wall member;
a fourth wall member opposingly spaced from and circumscribing the third wall member;
a second cavity cooperatively defined by the second wall member, third wall member and fourth wall member, the second cavity having a second opening opposing the second wall member;
wherein the first cavity is in fluid communication with the second cavity, and the overhang is receivable into the second cavity via the second opening; and
wherein the overhang is disposed in the second cavity, and the first cavity is in fluid communication with the second cavity.