US 12,348,085 B2
Motor rotor and motor
Bin Lai, Dongguan (CN); Hua Lan, Shanghai (CN); Mengde Li, Shanghai (CN); and Zijing Wang, Shenzhen (CN)
Assigned to Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed on Jan. 20, 2023, as Appl. No. 18/157,712.
Application 18/157,712 is a continuation of application No. PCT/CN2020/103671, filed on Jul. 23, 2020.
Prior Publication US 2023/0163647 A1, May 25, 2023
Int. Cl. H02K 1/27 (2022.01); H02K 1/02 (2006.01); H02K 1/276 (2022.01); H02K 21/14 (2006.01)
CPC H02K 1/276 (2013.01) [H02K 1/02 (2013.01); H02K 21/14 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A motor rotor, comprising:
a rotor iron core; and
a plurality of permanent magnets disposed on the rotor iron core, wherein at least some permanent magnets of the plurality of permanent magnets comprise concentrations of rare earth metallic elements continuously gradiently distributed or gradiently distributed in a multi-stage manner from a middle to both ends in a first trend along at least one direction perpendicular to a magnetization direction;
wherein the concentrations of rare earth metallic elements result in coercive forces of the at least some permanent magnets of the plurality of permanent magnets in a second trend along the at least one direction perpendicular to the magnetization direction, wherein the second trend proportionally corresponds to the first trend; and
wherein the concentrations of rare earth metallic elements result in magnetic forces of the at least some permanent magnets of the plurality of permanent magnets in a third trend along the at least one direction perpendicular to the magnetization direction, wherein the third trend proportionally corresponds to the first trend.