Talking about the bearing structure and technical indicators of Computer fan

Common bearings of Computer fan include ball bearing, oil bearing and magnetic suspension bearing. Ball bearings have changed the friction mode of bearings, using rolling friction. There are some steel balls or columns between the two iron rings, supplemented by some grease lubrication. This method is more effective in reducing friction between bearing surfaces, effectively improving the service life of fan bearings, and thus reducing the heat generation of the radiator and extending its service life. The disadvantage is that the process is more complex, leading to increased costs and higher work noise.
Oily bearing is a sleeve bearing with Sliding friction, which uses lubricating oil as lubricant and drag reducing agent. It can be said that it is the most common bearing technology in the current market. Due to its low cost and simple manufacturing, many products, including well-known brands, are still in use. Its advantages are quietness, low noise, and low price during initial use.
The motor of magnetic levitation bearings adopts a magnetic levitation design, which uses magnetic force to suspend the rotor in the air, so that there is no mechanical contact between the rotor and the stator. The principle is that the magnetic induction line is perpendicular to the magnetic levitation line, and the shaft core is parallel to the magnetic levitation line, so the weight of the rotor is fixed on the running track. The almost unloaded shaft core is used to support the anti magnetic levitation line direction, forming the entire rotor suspended on the fixed running track.
Compared with traditional ball bearings and oil bearings, magnetic bearings do not have mechanical contact and the rotor can run at very high speeds. They have advantages such as low mechanical wear, low energy consumption, low noise, long service life, no need for lubrication, and no oil pollution. They are particularly suitable for special environments such as high-speed, vacuum, and ultra clean environments. Magnetic levitation is actually just an auxiliary function and not an independent bearing form. Its specific application also needs to be combined with other bearing forms, such as magnetic levitation+ball bearing, magnetic levitation+oil bearing, magnetic levitation+vaporization bearing, and so on.