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Small Fan Big Knowledge - Introduction of Cooling Fan Operation Principle
Hits：1589 Date：2016/11/15
DC cooling fan operation principle:
According to Ampere's right hand rule, the conductor through the current, the surrounding magnetic field will be generated, if the conductor is placed in another fixed magnetic field, it will produce suction or repulsion, causing the object to move. Inside the fan blades of the DC cooling fan, a magnetic rubber magnet is attached in advance. And a pair of coils are wound around the center part of the silicon steel sheet, and the Hall sensing device is used as the synchronous detecting device to control a group of circuits which turns the two coils of the winding shafts in turn. Silicon steel produces different magnetic poles, the magnetic pole and rubber magnets produce the repulsive force. When the repulsive force is greater than the static friction of the cooling fan, the fan turns naturally. As the Hall sensor components to provide synchronization signal, the fan so it can continue to run, as its direction of operation, according to Fleming's right hand decision.
AC cooling fan operation principle:
AC cooling fan and DC cooling fan difference. The former power supply for the exchange, the power supply voltage will be positive and negative alternating, unlike the DC cooling fan power supply voltage must be dependent on circuit control, so that the two coils work in turn to produce different magnetic field. AC cooling fan due to the power frequency is fixed, so the silicon steel pole changes in the speed of the pole, the frequency determined by the frequency of the higher magnetic field switching speed, The same principle. However, the frequency can not be too fast, too fast will cause difficulties in starting.
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