Patent ID: 6703716
Filing Date: 2004-03-09
Classification: B62J,H02K

Abstract:
A permanent magnet generator for a bicycle light mounted on a bicycle that includes a frame, wheels rotatably mounted on the frame and an insulating bracket attached to the frame, the generator comprising:a rotor with an axis of rotation adapted to be rotatably mounted on the insulating bracket and adapted to abut against one of the wheels of the bicycle, the rotor including: two casings each having a first side abutting each other to form a chamber in the rotor and a second side opposite to each other; a hole with a diameter and an inner periphery centrally defined in the second side of each casing to securely mount a bearing with an outer periphery and a middle portion in the rotor; a recess with an inner periphery centrally defined in the first side of each casing and having a diameter greater than that of the hole; and an indent defined in the inner periphery of each recess; an annular coil securely mounted in the chamber in the rotor, the annular coil including: two metal covers abutting each other and soldered to enclose a coil seat and a winding wound around the coil seat; multiple salient poles situated in an inner periphery of each cover and parallel to the axis of rotation; and two inner wires electrically connected respectively to the covers and extending through the indents in the casings to electrically connect respectively to the outer peripheries of the bearings; a stator rotatably extending through the rotor and the coil, the stator including: a shaft made of insulating material, rotatably extending through the coil, having two opposite ends respectively secured in the bearings and a middle portion and partially extending out of the bearings and mounted in the insulating bracket of the bicycle for mounting the rotor on the bicycle; an annular flange radially extending outwardly from the middle portion of the shaft and having an outer periphery; and a ring of permanent magnets mounted on the outer periphery of the annular flange and corresponding to the salient poles of the coil; two electrical rings respectively mounted around the ends of the shaft and electrically connected to the middle portions of the bearings; and two outer wires each having a first end electrically attached to one of the electrical rings and a second end attached to the bicycle light; wherein the coil rotates with the casings relative to the stator when the bicycle is in use and generates electricity that is transmitted to the light to operate the light.