Lavet stepping motor with U-shaped coil core
US4720644A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 16, 1986 |
| Grant date | Jan 19, 1988 |
| Priority date | — |
| Expiry date | May 16, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K37/16
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A stator for a stepping motor of an electric watch comprises an elongated yoke member having a free end, a coil arm integrally formed on the other end of the yoke member and having a free end, an exciter coil arranged on the coil arm by being pushed onto this coil arm from the free end thereof, and a bridge member connecting the free ends of the yoke member and the coil arm, the yoke member with the coil arm and the bridge member hereby being flat elements made of a magnetizable sheet metal. In accordance with the invention, the coil arm is of a greater length then the exciter coil and the bridge member rests flat on the free ends of the yoke member and the coil arm and areally overlaps regions of these elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.