Patent ID: 6565326
Filing Date: 2003-05-20
Classification: F04D

Abstract:
A heat-dissipating fan structure comprising:a frame comprising a through-hole having two ends in which an air inlet and an air outlet are respectively defined, a support section being defined in one of the ends of the through-hole, at least two sets of windings being engaged on a wall of the frame, an IC control means being mounted on the frame and electrically connected to said at least two sets of windings; a rotor comprising a shaft and plural blades each having an outer edge, a permanent ring magnet being engaged with the outer edges of said plural blades and having at least one north pole and at least one south pole, the shaft having an end rotatably received in the support section of the frame; wherein the IC control means detects a change in a polarity of the permanent ring magnet of the rotor and sends a signal to alter a polarity of a magnetic field created by said at least two sets of windings, thereby driving the rotor to which the permanent ring magnet is mounted to turn by a repulsive force.