Epicycloidal step motor
US5579290A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1995 |
| Grant date | Nov 26, 1996 |
| Priority date | — |
| Expiry date | Sep 28, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K37/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The stator of the motor comprises two pole pieces (1, 2) which are axially staggered. An axially magnetized cylindrical rotor (5) is disposed in the openings or bores of said pole pieces. The rotor (5) is provided with an external toothing (3) which is continuously engaged with an internal toothing (4) of the stator. In the unexcited stator, the rotor (5) assumes a stable position by attraction to the pole pieces (1, 2). Due to the excitation of the stator by a pulse having a suitable polarity, the rotor is displaced to a diametrically opposed stable position. The toothings (3, 4) stay in engagement during said displacement, resulting in an angular displacement of the rotor, the angle being defined by the difference of the number of teeth of said toothings (3, 4). The motor allows a miniaturization and a simple control by alternating pulses of opposed polarities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.