Industrial Technology Research Institute

Chen-Sheng Weng

Tung-Chuan Wu

Shih-Chou Chen

Ray-Ten Chen

Chang-Chun Chen

A bicycle generator including a coil stator and a magnetic rotor. The coil stator includes a planar support, and an induction coil portion formed by a plurality of series-connected coil units which are evenly spaced along the circumference of the planar support. The magnetic rotor is rotatable relative to and substantially parallel to the coil stator, and includes a permanent magnet having a plurality of magnetic pole pairs formed on its circumference. The number of coil units in the induction coil portion is equal to the number of magnetic pole pairs in the magnetic rotor, and the coil units is winded into trapezoid or sector shape, and the span angle of each of the magnetic pole in the magnetic rotor is substantially equal to the span angle of each of the coil units in the coil stator. Alternatively, the bicycle generator may comprises a cylindrical coil stator and a cylindrical magnetic rotor. The coil stator includes a cylindrical support having a first cylindrical surface, and a cylindrical induction coil portion formed by a plurality of series-connected coil units which are evenly spaced on the first cylindrical surface of the cylindrical support in the circumferential direction. The cylindrical magnetic rotor includes a second cylindrical surface and a permanent magnet having a plurality of magnetic pole pairs formed on the second cylindrical surface facing the cylindrical induction coil portion.

Bicycle generator

An improved swinging type generator for use in automatic wrist watches is disclosed. It contains: (a) a base with a center shaft hole, (b) a stator mounted on the base containing at least one layer of ring-shaped coil plate having at least one periodic-wave-shaped induction coil arranged on and along a circumference of the ring-shaped coil plate; (c) an unbalanced-and-weighted swinging magnetic rotor having a central rotary shape. The rotary shaft is mounted in the shaft hole of the base, and the unbalanced-and-weighted swinging magnetic rotor includes a magnetic ring having a plurality of magnets arranged in a head-to-tail manner along a circumference of the magnetic ring. In a preferred embodiment the induction coil has the shape of a multiple-cycle square-wave, and the angle of the square wave equals the magnetic angle, which is the angle formed between half of the arc length of an individual magnet of the magnetic ring and the center of the shaft hole, so as to maximize the electro-motive force that can be generated.

Growing community of inventors

Hsinchu Hsien, Taiwan

Chen-Sheng Weng