Motor, cooling device having twisted spiral cooling channel and cooling method

A cooling method, comprising the steps of:

• providing a cooling device, a sleeve of the cooling device being sleeved onto an object, the sleeve having a spiral cooling channel, the spiral cooling channel extending inside a wall of the sleeve along the sleeve, the spiral cooling channel having cross-sections formed by walls of the spiral cooling channel, wherein orientation of the walls of the cross-sections of the spiral cooling channel changes relative to the sleeve along a length of the spiral cooling channel;
• and
• providing a cooling fluid to pass through the spiral cooling channel, the cooling fluid in the spiral cooling channel being affected by the changing orientation of the walls of the cross-sections of the spiral cooling channel along the length thereof to form a complex secondary flow, so as to increase turbulence intensity and vorticity and improve convection heat dissipation efficiency.

A cooling device, comprising:

• a sleeve, a wall of the sleeve having a twisted spiral cooling channel extending along the sleeve inside the wall of the sleeve;
• the twisted spiral cooling channel having a first spiral form extending along the sleeve and a second spiral form extending along the twisted spiral cooling channel, wherein the twisted spiral cooling channel is formed 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.