According to Ampere’s right-hand rule, a conductor passes current and a magnetic field is 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 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 this magnetic pole generates repulsive force with the rubber magnet. When the repulsive force is greater than the static friction force of the lice fan, the fan leaves naturally rotate.

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.