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Working principle of fan

:2021-01-13 :200

Working principle of DC fan:

According to Ampere's right-hand rule, a conductor passes current and a magnetic field will be generated around it. If the conductor is placed in another fixed magnetic field, it will produce attraction or repulsion, causing the object to move. Inside the fan blade of the DC fan, a rubber magnet filled with magnetism is attached. Surrounding the silicon steel sheet, the shaft is wound with two sets of coils, and Hall induction components are used as a synchronous detection device to control a set of circuits, which make the two sets of coils wound on the shaft work in turn. The silicon steel sheet produces different magnetic poles, and the magnetic poles and the rubber magnet generate repulsive force. When the repulsive force is greater than the static friction of the lice fan, the fan blades rotate naturally. Since the Hall sensor component provides the synchronization signal, the fan can continue to operate. As for the direction of rotation, it can be determined according to Fleming's right-hand rule.


Working principle of AC fan:

The difference between AC fan and DC fan. The former power supply is alternating current, and the power supply voltage will alternate between positive and negative. Unlike DC fans, the power supply voltage is fixed and must rely on circuit control to make the two sets of coils work in turn to generate different magnetic fields. The AC fan has a fixed power frequency, so the magnetic pole change speed generated by the silicon steel sheet is determined by the power frequency. The higher the frequency, the faster the magnetic field switching speed, and theoretically the faster the speed, just like the principle that the more poles the DC fan has same. However, the frequency should not be too fast, too fast will cause difficulty in activation.


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