Synchronous motor device for timepiece
US4565955A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 21, 1983 |
| Grant date | Jan 21, 1986 |
| Priority date | — |
| Expiry date | Oct 21, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P1/46
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A synchronous motor device for a timepiece including a synchronous motor for the timepiece having a rotor with a pair of magnetized rotor poles around its circumference, a stator consisting of a pair of stator plates with a plurality of stator poles arranged around the vicinity of said rotor separated by an air gap, and an energizing coil supplying alternating magnetic flux to said stator. The synchronous motor for timepiece includes main stator poles, first supplementary stator poles and second supplementary stator poles. The main stator poles are further provided with both of the stator plates at the facing position against the rotor shaft and mainly forms the static stable position of the rotor. The first supplementary stator poles are facingly positioned against the rotor shaft and provided with both of the stator plates at separate positions from said main stator poles. This first supplmentary stator poles form the dynamic stable position of the rotor in the cooperation with the main stator poles and have wider gaps than the main stator poles. The second supplementary stator poles are facingly positioned against the rotor shaft and provided in the vicinity of the dynamic stabl…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.