US 11,942,826 B2
Electric machine cooling
Ken Flydalen, Trondheim (NO)
Assigned to Rolls-Royce Electrical Norway AS, Trondheim (NO)
Filed by Rolls-Royce Electrical Norway AS, Trondheim (NO)
Filed on Sep. 24, 2021, as Appl. No. 17/448,762.
Prior Publication US 2023/0095216 A1, Mar. 30, 2023
Int. Cl. H02K 1/2706 (2022.01); B64D 27/24 (2006.01); H02K 1/32 (2006.01); H02K 9/06 (2006.01)
CPC H02K 1/2706 (2013.01) [B64D 27/24 (2013.01); H02K 1/32 (2013.01); H02K 9/06 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A rotor assembly comprising:
a rotor core having an axial length and configured to rotate about a longitudinal axis, the rotor core comprising:
a first wall;
a second wall radially within the first wall and defining a fluid flow path configured to guide a fluid along an inner surface of the first wall; and
an impeller between the inner surface of the first wall and an outer surface of the second wall, wherein the impeller is configured to impart a radial force on the fluid that drives the fluid radially outwards from the longitudinal axis within the fluid flow path.