According to Ampere's right-hand rule, the current through the conductors, creates a magnetic field surrounding, if this conductor is placed in a separate fixed magnetic field, the attraction or repulsion force will be generated, causing the object to move. In the DC fan rotor (blades) inside, a pre-filled with magnetic attachment of the permanent magnet ring rubber (rubber magnet by the number of poles within the silicon steel filled permanently fixed corresponding number of pole pairs, i.e., N, S, N, S ~). Rotor (blades) to the axis of the center position and surrounded by silicon steel, silicon steel wrapped around the two coils, the use of the Hall sensor components as a synchronous detection device, controls a group of circuit which makes wound on silicon steel two sets of coils in turn switching operation, so that the outer surface of silicon steel have different magnetic poles (i.e. N, S, N, S ~), the magnetic pole and the rubber magnets mutual repulsion between an inhalation. When the suction fan of repulsion greater than the static friction, the rotor (blades) Natural rotation. Due to the Hall sensor component provides a synchronization signal, the fan was able to continue functioning, as its direction of rotation, right-hand rule to follow Fleming decision.