US 11,870,305 B2
System and method for reduced rotor losses
Shanmukha Rama Krishna, Sengkang (SG); Malaiyan Karthikeyan Srihariharan, Singapore (SG); and Ellis Fui Hen Chong, Derby (GB)
Assigned to Rolls-Royce Singapore Pte. Ltd., Singapore (SG); and Rolls-Royce plc, London (GB)
Filed by Rolls-Royce Singapore Pte. Ltd., Singapore (SG); and Rolls-Royce plc, London (GB)
Filed on Mar. 22, 2021, as Appl. No. 17/208,444.
Prior Publication US 2022/0302777 A1, Sep. 22, 2022
Int. Cl. H02K 1/02 (2006.01); H02K 1/28 (2006.01); H02K 1/276 (2022.01); H02K 11/01 (2016.01); H02K 1/16 (2006.01)
CPC H02K 1/276 (2013.01) [H02K 1/165 (2013.01); H02K 11/01 (2016.01); H02K 2213/03 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method comprising:
selecting a first number of segments of a plurality of segmented metallic bands that is greater than a number of segments of a plurality of magnet segments, wherein the plurality of segmented magnets are configured to be disposed about an outer surface of a rotor core, wherein the plurality of segmented metallic bands are configured to secure the plurality of segmented magnets to the outer surface of the rotor core;
determining one or more alternating magnetic field harmonic frequencies causing an eddy current loss in a rotor assembly including both the plurality of segmented magnets and the plurality of segmented metallic bands;
determining a first axial length of each segment of the plurality of segmented bands that reduces the eddy current loss of the rotor assembly; and
determining a second number of segments of the plurality of segmented metallic bands based on the first axial length.