Formation of anisotropic annular magnetic member for bicycle generator

Abstract

Abstract PURPOSE:To increase the density of magnetic flux as well as to contrive enhancement of generating capability for the subject magnet member by a method wherein the circular magnet piece, having the annular magnet of ferrite which is splitted into a plurality of parts, is perpendicularly formed in anisotropy and assembled in annular shape. CONSTITUTION:The anisotropic circular magnet piece 1, consisting of a ferrite magnet, is formed in such a manner that it has a perpendicular anisotropy by perpendicularly pressing it in the paralleled magnetic field. On the inner surface of this anisotropic circular magnet piece, an N-pole and an S-pole are polarized and magnetized alternately and successively. The eight pieces of the anisotropic circular magnet pieces 1 are annularly arranged on the inner surface of the hub drum 2 made of iron with their end face contacting the inner surface of the hub drum 2, and an anisotropic annular magnet 4 is formed by fixing it using a bonding agent 3. Accordingly, the generator for bicycle having a high magnetic density and a large generating capacity can be obtained.

Inventors

• 👤 Shokichi Kumakura

Bibliographic Details