"24V DC Cooling Fan" ball changed the way of bearing friction, rolling friction, this approach is more effective in reducing the friction between the bearing surface phenomenon, effectively increasing the fan bearing life, and therefore the radiator the longer life. The disadvantage is that the process brings more complex, resulting in cost increase, it also brings higher operating noise. "24V DC Cooling Fan" in addition to a bearing we have to mention that the main magnetic bearing mute. The use of magnetic force of the magnetic bearing rotor is suspended in the air, so that there is no mechanical contact between the rotor and the stator. "24V DC Cooling Fan" The principle is that the magnetic flux lines and the maglev line perpendicular to the axis of the core with the magnetic lines are parallel, so the weight of the rotor is fixed on the running track, the use of the spool core is almost no load to the opposite maglev line direction of the top support, let into the entire rotor vacant.