Energizing method for a single phase timepiece stepping motor
US4542329A · kind A · utility
24Cited by
5References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 14, 1983 |
| Grant date | Sep 17, 1985 |
| Priority date | — |
| Expiry date | Jun 14, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P8/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An energizing method for a timepiece stepping motor provides just sufficient energy to the motor winding to assure a single step of the rotor with each driving pulse. With each pulse the winding is initially energized at a constant voltage (period T.sub.1) then at a constant current (period T.sub.2) between two limits Imax and Imin. When the time period .DELTA.T.sub.3 required for the current to pass from Imax to Imin is greater than a reference time period .DELTA.T.sub.ref. the energization is terminated. The invention may be employed in a wristwatch with the purpose of reducing energy consumption and increasing battery life.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.