Method of controlling a bi-directional stepping motor and a bi-directional stepping motor adapted to be controlled by this method
US5028857A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 10, 1989 |
| Grant date | Jul 2, 1991 |
| Priority date | — |
| Expiry date | May 10, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P8/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for improving the efficiency of a stepping motor (1) comprising a rotor (15) having a permanent magnet (16) producing a first magnetic field, as well as a first coil (13) and a second coil (14) for supplying to the magnet (16) respectively a second magnetic field (18) and a third magnetic field (19) symmetrical to one another in relation to an axis of symmetry (7) intersecting the axis of rotation (15a) of the rotor (15). The method comprises supplying to the motor (1), to make its rotor (15) turn in a given sense, drive pulses during which the two coils (13, 14) are supplied simultaneously by currents having a sense and an intensity such that, at the beginning of each drive pulse, the resultant magnetic field produced by the vectorial addition, in the magnet (16), of the second field (18) and the third field (19) forms, with another magnetic field (17) that results from the vectorial addition, in the magnet (16) of the two parts of the field produced by the latter magnet each of which flows through one of the coils (13, 14), an angle between 110.degree. and 160.degree. and having a sense, measured from the latter resultant field (17) towards the former, identical to the s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.