A cooling fan of the common bearing are: ball bearing, oil bearing, magnetic levitation bearing.
Ball bearing
Ball Bearing changed the way of Bearing friction, adopts rolling friction, there are some among two hoop steel or steel columns, supplemented by some grease lubrication. The way is more effective in reducing the friction between the bearing surface phenomenon, effectively improve the service life of the fan bearing, and so will the heat radiator is reduced, prolong service life. The downside is that technology is more complex, lead to cost increase, at the same time also bring higher noise.
Sleeve bearing
Sleeve Bearing is the use of sliding friction Sleeve Bearing, dongguan, a cooling fan to use oil as a lubricant and drag reduction agent. Is now one of the most common bearing technology on the market, due to low cost, simple manufacturing, many products including well-known brands are still continue to use. Its advantage is the early use of quiet, low noise, low price.
Magnetic Bearing
Magnetic suspension Bearing motor USES the maglev (Magnetic System, MS) design, is the use of Magnetic effect of the rotor suspended in the air, no mechanical contact between the rotor and stator. Is the principle of magnetic induction line with maglev line, vertical shaft core and the maglev line are parallel, so the weight of the rotor is fixed on the orbit, the use is almost without load axial maglev line direction top bracing, form the whole rotor suspended, in a fixed orbit operation. Compared with traditional ball bearing, oil bearing, magnetic bearing, there is no mechanical contact, the rotor can be run to high speed, small mechanical wear and tear, low energy consumption, low noise, long service life, no lubrication, no oil pollution, etc, especially suitable for high speed, vacuum, super net, etc
