US 11,695,310 B2
Motor, cooling device having twisted spiral cooling channel and cooling method
Mi-Ching Tsai, Tainan (TW); Shyy-Woei Chang, Kaohsiung (TW); Min-Fu Hsieh, Tainan (TW); Kai-Jung Shih, Tainan (TW); Wei-Ling Cai, Pingtung County (TW); and Jen-Hsiang Liu, Taichung (TW)
Assigned to National Cheng Kung University, Tainan (TW)
Filed by NATIONAL CHENG KUNG UNIVERSITY, Tainan (TW)
Filed on Nov. 30, 2020, as Appl. No. 17/106,708.
Claims priority of application No. 109112683 (TW), filed on Apr. 15, 2020.
Prior Publication US 2021/0328477 A1, Oct. 21, 2021
Int. Cl. H02K 5/20 (2006.01); H02K 9/19 (2006.01)
CPC H02K 5/20 (2013.01) [H02K 9/19 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A cooling device, comprising:
a sleeve, a wall of the sleeve having a spiral groove formed inside the wall and extending along the sleeve;
a spiral duct mounted in the spiral groove, the spiral duct having a first spiral form extending along the spiral groove and a second spiral form extending along the spiral duct, and
a twisted spiral cooling channel formed in the spiral duct by walls of the spiral duct in thermal contact with the spiral groove of the sleeve, wherein the twisted spiral cooling channel has cross-sections defined by the walls of the spiral duct, and wherein orientation of the walls of the cross-sections of the twisted spiral cooling channel changes relative the sleeve along a length of the spiral duct for increasing turbulence intensity and vorticity of a cooling fluid inside the spiral duct.