Stator assembly for a timepiece stepping motor
US5059840A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 25, 1991 |
| Grant date | Oct 22, 1991 |
| Priority date | — |
| Expiry date | Jan 25, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K37/16
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Briefly stated, the invention comprises an improved stepping motor and method of making it including locating it in the timepiece frame, the stepping motor including a rotor and a stator. A flat magnetizable stator member defines a central opening with diametrically opposed narrow sections on either side of the opening, a non-magnetic bushing disposed in the opening and secured to the surface of the stator member. The bushing has diametrically opposed cut-out portions aligned with the narrow sections. The narrow sections are severed to separate the stator into two pole shoes which are retained in position by the bushing. The severing is preferably by laser, but may includes sawing or other severing methods. The pole shoes of the stator member are then attached to the timepiece frame plate. The stepping motor rotor is journalled in bores formed in the frame and bushing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.