US 12,255,497 B2
Retention cap for permanent magnet rotor
Marc J. Corcoran, St. Charles, MO (US); Jeffrey Scott Sherman, Creve Coeur, MO (US); Daniel E. Bailey, Ballwin, MO (US); Chetan O. Modi, Valley Park, MO (US); and John H. Hussey, St. Louis, MO (US)
Assigned to Nidec Motor Corporation, St. Louis, MO (US)
Filed by Nidec Motor Corporation, St. Louis, MO (US)
Filed on Oct. 31, 2022, as Appl. No. 18/051,347.
Claims priority of provisional application 63/275,249, filed on Nov. 3, 2021.
Prior Publication US 2023/0140075 A1, May 4, 2023
Int. Cl. H02K 1/28 (2006.01); H02K 1/276 (2022.01)
CPC H02K 1/28 (2013.01) [H02K 1/2773 (2013.01)] 20 Claims
OG exemplary drawing
 
15. A rotor for an electric motor, said rotor comprising:
a core rotatable about an axis and defining a plurality of magnet-receiving slots;
a plurality of magnets, each of said magnets being received in a respective one of said magnet-receiving slots; and
a magnet retention cap fixed relative to said core and including a resiliently deformable magnet retention element configured to restrict axial movement of the magnets relative to the core,
said cap including a radially and circumferentially extending body and a circumferentially extending wall projecting from the body axially away from the core,
said wall having an axial wall height and presenting a contoured form such that the wall height varies circumferentially between maximum and minimum wall heights.