Diskette incorporating a permanent magnet generator having a stator with magnetic pole teeth that are axially thinner than a permanent magnet that cooperates with the stator

摘要

A diskette incorporating a flat disk-shaped permanent magnet generator is disclosed. This permanent magnet generator comprises a rotor having a permanent magnet that can rotate together with a hub; the permanent magnet having a plurality of rotor magnetic poles on the circumference thereof, and a stator comprising a plurality of magnetic pole teeth having on one end thereof stator magnetic poles that can face the rotor magnetic poles via a magnetic gap. The magnetic pole teeth extend from the stator magnetic poles outside of the rotor, with stator coils wound on the extended portions of the magnetic pole teeth and the outside ends of the magnetic pole teeth connected to each other by a back yoke. The thickness of the outward extending magnetic pole teeth is smaller than the thickness of the permanent magnet. The diskette should preferably be a 3.5'' floppy disk.