US 12,395,023 B2
Rotor for an electric aircraft motor and a method for manufacturing
Manon Danielle Belzile, Fairfield, VT (US); and Stephen Widdis, Colchester, VT (US)
Assigned to BETA AIR LLC, South Burlington, VT (US)
Filed by BETA AIR LLC, South Burlington, VT (US)
Filed on Oct. 14, 2022, as Appl. No. 17/966,525.
Prior Publication US 2024/0128819 A1, Apr. 18, 2024
Int. Cl. H02K 1/30 (2006.01); B64C 27/32 (2006.01); B64C 29/00 (2006.01); H02K 1/2783 (2022.01); H02K 9/22 (2006.01); H02K 15/03 (2025.01); H02K 21/16 (2006.01)
CPC H02K 1/30 (2013.01) [B64C 27/32 (2013.01); H02K 1/2783 (2022.01); H02K 9/227 (2021.01); H02K 15/03 (2013.01); H02K 21/16 (2013.01); B64C 29/0008 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A rotor of an electric propulsion assembly, the rotor comprising:
a hub;
a hoop coupled to and concentrically arranged with respect to the hub;
at least one spoke extending between the hub and the hoop;
a plurality of magnets fixedly attached to an outer circumferential surface of the hoop; and
a retention band structure surrounding the plurality of magnets, the retention band structure including:
a metallic sleeve portion; and
at least one slit extending circumferentially around the metallic sleeve portion to define at least two separate metallic retention bands positioned on an outermost surface of the plurality of magnets, wherein the at least one slit formed between the at least two separate metallic retention bands is configured to inhibit propagation of eddy currents in the metallic sleeve portion,
wherein coefficients of thermal expansion of the at least two separate metallic retention bands and the at least one spoke are substantially the same.