Compact cylindrical stepping motor and advancing device
US5831356A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 2, 1997 |
| Grant date | Nov 3, 1998 |
| Priority date | — |
| Expiry date | Apr 2, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K37/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An ultra compact motor, comprises a magnet which is formed in a cylindrical shape and is circumferentially divided into n portions and alternately magnetized into different magnetic poles at least on the external periphery thereof. A first coil, a rotor and a second coil are arranged in this order along the axial direction of the rotor, and first external and internal magnetic poles magnetized by the first coil are arranged so as to oppose respectively the external and internal peripheries of the magnet at an end of the magnet while second external and internal magnetic poles magnetized by the second coil are arranged so as to oppose respectively the external and internal peripheries of the magnet at the other end of the magnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.