Electromagnetic stepping motor with two coupled rotors
US4563604A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 11, 1984 |
| Grant date | Jan 7, 1986 |
| Priority date | — |
| Expiry date | Sep 11, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K16/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The electromagnetic stepping motor of the invention comprises two rotors coupled to a common transmission wheel. The magnetic circuit of the stator is arranged so as to subject the respective rotors to fluxes of opposite senses .phi..sub.1, .phi..sub.2 when the winding is energized. The magnetization sense of the first rotor is opposite to the magnetization sense of the second rotor in a manner such that they turn in the same sense when subjected to said opposite sense fluxes. This arrangement permits either a diminution of the volume or a decrease in energy consumption of the motor and at the same time increases the security of running thereof in the presence of external magnetic fields. Such a motor is particularly adapted to small volume horological applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.