Diskette incorporating permanent magnet generator with reduced cogging torque and permanent magnet generator for use in diskette
US6265800A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 24, 1999 |
| Grant date | Jul 24, 2001 |
| Priority date | — |
| Expiry date | Nov 24, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K29/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A permanent magnet generator is so thin as to be incorporated in a 3.5" diskette. The generator having so low cogging torque that can be rotated smoothly even by a low torque driving source as a 3.5" FDD to generate stable output is disclosed. It has stator magnetic poles facing via a magnetic gap an outer circumferential surface of the stator permanent magnet having a plurality of magnetic poles on it. One to six of the stator magnetic poles are removed and instead of the removed magnetic poles provided is a soft magnetic piece to face the rotor magnetic poles. Grooves are preferably provided on the soft magnetic piece, facing the rotor magnetic poles. A notch is provided on the permanent magnet generator to avoid interference with an input/output terminal and/or a card contact terminal of the diskette for inserting a memory card.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.