Bipolar stepping motor rotor with drive pinion and method of manufacture
US4700091A · kind A · utility
84Cited by
10References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 22, 1986 |
| Grant date | Oct 13, 1987 |
| Priority date | — |
| Expiry date | Aug 22, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K37/16
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A wristwatch movement has a Lavet stepping motor directly driving a toothed center wheel by means of a drive pinion which is an integral part of the stepping motor rotor. The rotor comprises a bipolar permanent magnet member and a plastic rotor body molded around the central part of the magnet member to surround it. The rotor body defines a pair of driving pins oriented at a preselected angle with respect to the axis of magnetization. The rotor body also includes journals supporting it for rotation within the stator opening of the stepping motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.