Miniature electric stepping motor
US4242623A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 1979 |
| Grant date | Dec 30, 1980 |
| Priority date | — |
| Expiry date | May 10, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04C3/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A miniature electric stepping motor comprising a magnetized rotor adapted for rotation in the air gap of a stationary magnetic circuit having an electric excitation coil connected to a control device. The control device cmprises means for applying to the excitation coil control impulses of a first polarity and of an amplitude and a width such that the rotor rotates in a first direction of rotation from one stable equilibrium position to the next one and means for applying to the excitation coil, upon an outer control, starting from each stable equilibrium position, first a pre-impulse of said first polarity and subsequently a control impulse in the reverse direction, having a polarity opposite to the said first polarity, such that the rotor, after having reversed its direction of rotation, moves in the reverse direction of rotation until it reaches the stable equilibrium position following that at which the said pre-impulse has been applied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.