US 12,407,214 B2
Rotor for an electric motor incorporating sound absorption elements
Cédric Ledieu, Mont Saint Eloi (FR)
Assigned to NOVARES FRANCE, Clamart (FR)
Appl. No. 17/907,296
Filed by NOVARES FRANCE, Clamart (FR)
PCT Filed Mar. 4, 2021, PCT No. PCT/FR2021/050374
§ 371(c)(1), (2) Date Sep. 26, 2022,
PCT Pub. No. WO2021/191518, PCT Pub. Date Sep. 30, 2021.
Claims priority of application No. 2002933 (FR), filed on Mar. 25, 2020.
Prior Publication US 2023/0353011 A1, Nov. 2, 2023
Int. Cl. H02K 5/24 (2006.01); H02K 1/276 (2022.01)
CPC H02K 5/24 (2013.01) [H02K 1/276 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A rotor for an electric motor comprising:
a rotor shaft rotatably mounted about an axis;
a lamination stack coaxially mounted on the rotor shaft, said lamination stack comprising a plurality of first internal cavities and second internal cavities;
a plurality of permanent magnets housed inside the first internal cavities of the lamination stack; and
a front flange and a rear flange coaxially mounted on the rotor shaft and axially arranged on either side of the lamination stack;
wherein at least two of the second internal cavities each house at least one sound absorption element, said at least one sound absorption element being adapted to attenuate the vibrations and/or the mechanical and/or magnetic noises generated by the rotor during its operation within the electric motor,
wherein the or each sound absorption element is secured to one of the front or rear flanges, said sound absorption element may be over-molded, or welded, or glued, or clipped to said front or rear flange,
wherein each second internal cavity is axially through, and
wherein the or each sound absorption element has a shape complementary to that of the second internal cavity in which the or each sound absorption element is housed.