US 12,470,099 B2
Rotor assembly with magnets and plate with a protrusion in close contact with the magnet and with a resin portion
Yong Ho Kim, Yongin-si (KR); and Bit Na Lee, Yongin-si (KR)
Assigned to HYUNDAI MOBIS CO., LTD., Seoul (KR)
Filed by HYUNDAI MOBIS Co., Ltd., Seoul (KR)
Filed on Aug. 2, 2022, as Appl. No. 17/879,025.
Claims priority of application No. 10-2021-0101558 (KR), filed on Aug. 2, 2021.
Prior Publication US 2023/0034210 A1, Feb. 2, 2023
Int. Cl. H02K 1/27 (2022.01); H02K 1/278 (2022.01); H02K 1/28 (2006.01); H02K 15/12 (2006.01)
CPC H02K 1/278 (2013.01) [H02K 1/28 (2013.01); H02K 15/12 (2013.01); H02K 2213/03 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A rotor assembly comprising:
a shaft;
a rotor core having a through-hole which is formed in an axial direction (A) and into which the shaft is inserted;
a magnet inserted into an inner space of the rotor core; and
a plate provided in close contact with at least one side of the rotor core in the axial direction (A),
wherein the plate comprises a protrusion formed in a region, which faces a region between a side surface of the magnet and the circumference an inner circumferential surface of the rotor core, and protruding toward the rotor core,
wherein a certain region is formed between the rotor core and the magnet, and the rotor assembly further comprises a resin portion that is provided in the certain region and bonded to the rotor core and the magnet
wherein the protrusion is provided in close contact with one end of the magnet that is adjacent to the circumference of the rotor core,
wherein the resin portion comprises a first resin portion bonded to one end of the magnet that is adjacent to the circumference of the rotor core
wherein an empty space, which is not filled with the resin portion, is formed between the magnet and the rotor core at the other end of the magnet on the opposite side from the one end.