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The common bearings of the cooling fan are: ball bearing, oil bearing, magnetic suspension bearing.
Ball bearing
Ball Bearing changes the friction mode of the Bearing, and USES rolling friction. In the middle of the two rings, there are some steel balls or steel columns, with some grease lubrication. This method is more effective in reducing the friction between the bearing surfaces and effectively improves the service life of the fan bearing, thereby reducing the heat loss of the radiators and extending the service life. The disadvantage is that the process is more complex, resulting in higher cost and higher working noise.
Oil bearing
A Sleeve Bearing used for sliding friction is used as a lubricant and a drag reduction agent. Arguably the most common type of bearing technology on the market today, due to its low cost and simple manufacturing, many products including well-known brands are still in use. Its advantages are the initial use of quiet, low noise, low price.
Magnetic suspension bearing
The motor of Magnetic Bearing (Magnetic Bearing) is designed by Magnetic levitation System (MS), which USES Magnetic force to suspend the rotor in the air, leaving no mechanical contact between the rotor and the 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 clean and other special environment. Maglev in fact is a kind of auxiliary function, is not an independent bearing form, specific application must also cooperate with other forms of bearing, such as magnetic levitation + ball bearing, magnetic levitation, oil bearing, magnetic levitation + vaporizing bearing, and so on.