| 摘要 |
PROBLEM TO BE SOLVED: To provide a dynamo which can improve power generation efficiency in an external rotation type dynamo which generates electricity by causing a roller part equipped with a power generation mechanism to touch a top of an bicycle tire. SOLUTION: The power generation mechanism 47 includes: a rotor 48; and a stator 49. The rotor 48 includes a permanent magnet group 46 in which an S polar and an N polar are arranged in a circumferential direction at even intervals on an inner peripheral surface of a roller part 5. The stator 49 includes: a tubular core 44 mounted on a support shaft 41 for rotatably supporting the roller part 5; a pair of stator cores 42, 43 which surround the peripheral surface of the tubular core, and are equipped with comb-like pole pieces opposing to magnetic poles of the permanent magnet group 46 so that the comb-like pole pieces mesh each other from the right and the left of the tubular core 44; and a winding coil 45 arranged between the tubular core 44 and the stator cores 42, 43. The tubular core 44 is formed of sintered powder magnetic materials. Further, the support shaft 41 is formed of non-magnetic materials. COPYRIGHT: (C)2011,JPO&INPIT |
