Big knowledge of small fans-introduction to the operation principle of cooling fans
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 generate attraction or repulsion, causing the object to move. Inside the fan blade of the DC cooling fan, a rubber magnet filled with magnetism is attached. Surrounding the silicon steel sheet, the shaft is wound with two sets of coils, and the Hall induction component is used as a synchronous detection device to control a set of circuits that 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 cooling 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.
Operating principle of AC cooling fan:
The difference between AC cooling fan and DC cooling fan. The former power supply is AC, and the power supply voltage will alternate between positive and negative. Unlike the DC cooling fan, which has a fixed power supply voltage, it must rely on circuit control to make the two sets of coils work in turn to generate different magnetic fields. The AC cooling 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. Theoretically, the speed will be faster. The principle is the same. However, the frequency cannot be too fast, too fast will cause difficulty in starting.
DC Fans | Motor Products Development and Supplier
