Patent ID: 6719107
Filing Date: 2004-04-13
Classification: H02P

Abstract:
A braking assembly for an exercise apparatus, comprising:a stator having an outer circumferential surface and a central shaft hole for a rotary central shaft to extend therethrough; a rotor, located around the outer circumferential surface of said stator to rotate along with said rotary central shaft when the rotary central shaft rotates; a pair of curved braking plates, each having an outer circumferential surface; a plurality of first permanent magnets fixed to the outer circumferential surface of each said curved braking plate; two adjacent ends of said two curved braking plates being pivotally connected via pivoting means to predetermined positions on the circumferential surface of said stator, and the other two adjacent ends of said two curved braking plates being free ends; a plurality of second permanent magnets, each of which having a north pole and a south pole, arranged around an outer surface of said rotary central shaft, so that the north poles and the south poles of the second permanent alternate around said rotary central shaft; at least one power-generating coil being provided on said stator at a position close to said second permanent magnets around said rotary central shaft, whereby when said rotary central shaft rotates and brings said second permanent magnets mounted therearound to rotate at the same time, an induced electromotive force is generated through induction of said power-generating coil; and a pulling mechanism provided on said stator to pull said curved braking plates at said free ends via two pulling cords, and a pulling force applied by said pulling mechanism to said free ends of said curved braking plates is dependent on said induced electromotive force generated by said power-generating coil and able to change an air clearance between said first permanent magnets on said curved braking plates and an inner circumferential surface of said rotor to thereby regulate a brake force of said braking assembly.