Wind power generation apparatus

A wind power generation apparatus, comprising:

• a rotating shaft defining an axial direction parallel to a longitudinal direction thereof;
• a wind power generation device assembled to the rotating shaft and comprising:
• a rotor assembly comprising:
• a drag blade being in a spiral shape and fixed on the rotating shaft;
• an inner housing being in a ring-shape and connected to an outer edge of the drag blade;
• and
• a first magnetically attractable module and a second magnetically attractable module that are assembled to an outer surface of the inner housing and that are spaced apart from each other, wherein the first magnetically attractable module and the second magnetically attractable module face each other and have a magnetic force there-between;
• and
• a stator assembly comprising:
• an outer housing sleeved around the inner housing;
• and
• an induction module fixed on an inner surface of the outer housing, wherein when the drag blade is driven by a wind force, the rotor assembly is rotated relative to the stator assembly by taking the rotating shaft as a rotation axis, and a region between the first magnetically attractable module and the second magnetically attractable module passes through the induction module so as to allow the induction module to generate an induction current;
• and
• an acceleration restriction mechanism disposed between the inner housing and the outer housing and comprising:
• N number of swing structures each having at least one swing arm, wherein N is a positive integer greater than one, and the at least one swing arm of each of the swing structures comprises a pivotal portion and a metal portion, and wherein in the at least one swing arm of each of the swing structures, the pivotal portion is pivotally connected to the inner housing, and the metal portion is movable relative to the inner housing from an initial position to an acceleration restriction position by a centrifugal force that is generated from the rotor assembly in rotation;
• and
• a magnetic ring fixed on the outer housing, wherein when the metal portion of the at least one swing arm of each of the swing structures is at the acceleration restriction position, the metal portion at least partially covers the magnetic ring along the axial direction, so that the metal portion generates an eddy current limiting a rotating acceleration of the rotor assembly.