US 12,170,476 B2
Motor rotor cooling system
Yi-Ming Wu, Taoyuan (TW); Shian-Min Tsai, Taoyuan (TW); Mu-Hsien Chou, Taoyuan (TW); and Che-Ming Cheng, Taoyuan (TW)
Assigned to DELTA ELECTRONICS, INC., Taoyuan (TW)
Filed by DELTA ELECTRONICS, INC., Taoyuan (TW)
Filed on Jun. 21, 2022, as Appl. No. 17/808,101.
Claims priority of application No. 202111490581.8 (CN), filed on Dec. 8, 2021.
Prior Publication US 2023/0179065 A1, Jun. 8, 2023
Int. Cl. H02K 9/193 (2006.01); H02K 1/28 (2006.01); H02K 1/32 (2006.01); H02K 5/20 (2006.01)
CPC H02K 9/193 (2013.01) [H02K 1/28 (2013.01); H02K 1/32 (2013.01); H02K 5/203 (2021.01)] 20 Claims
OG exemplary drawing
 
1. A motor rotor cooling system comprising:
a rotor structure comprising a silicon steel, magnets and a shaft, the shaft has a shaft oil channel, a shaft oil inlet and a shaft oil outlet, wherein the shaft oil inlet and the shaft oil outlet is connected to the shaft oil channel, the silicon steel has magnet slots to accommodate the magnets respectively;
a first end plate disposed at a first end of the silicon steel, the first end plate is recessed to form at least one first-shaped oil groove and at least one second-shaped oil groove, the first end plate has at least one first plate oil outlet that is connected to the first-shaped oil groove; and
a second end plate disposed at a second end of the silicon steel, the second end plate is recessed to form at least another first-shaped oil groove and at least another second-shaped oil groove, the second end plate has at least one second plate oil outlet that is connected to the first-shaped oil groove of the second end plate,
wherein the first-shaped oil groove of the first end plate is connected to the second-shaped oil groove of the second end plate via a corresponding one of the magnet slots to form a first oil cooling path, and the second-shaped oil groove of the first end plate is connected to the first-shaped oil groove of the second end plate via a corresponding one of the magnet slots to form a second oil cooling path.