Difference between DC and AC fan operation principles

According to the right-hand ampere's law, when a conductor passes through an electric current, a magnetic field will be generated around it. If the guide device is placed in another constant magnetic field, it will generate suction or repulsion, causing the object to move. A rubber magnet filled with magnetism in advance is installed in the blade of Dongguan DC fan. Around the silicon steel sheet, the shaft part is wound by two groups of coils, and the Hall inductance element is used as a synchronous detection device to control the circuit group, so that the two groups of coils wound around the shaft work in turn. Silicon steel sheet produces various magnetic poles, which generate attraction and repulsion through rubber magnet. When the suction and repulsion force is greater than the friction force of the electrostatic louse fan, the blades of the DC fan in Dongguan rotate naturally. Because the Hall sensor module provides a synchronization signal, the fan blades can operate continuously.

Working principle of AC fan:

The difference between AC fan and DC fan. Different from the fixed fan in Dongguan, it has a constant supply voltage, which depends on the circuit control, so the two groups of coils can work in turn to produce different magnetic fields. As the power frequency of AC fan is constant, the change speed of magnetic pole generated by silicon steel sheet is determined by the power frequency. The higher the frequency is, the faster the switching speed of the magnetic field is theoretically, just as the more poles of the fixed fan, the faster the speed is. However, the frequency should not be too fast, which will make activation difficult.

A good fan mainly focuses on air volume, speed, noise, service life, fan blade bearing, etc.

DC fan, EC fan, CPU heat sink