Driving device for a stepping motor
US4734632A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1986 |
| Grant date | Mar 29, 1988 |
| Priority date | — |
| Expiry date | Sep 26, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P8/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A driving device for a stepping motor wherein detection of a position of the rotor of a stepping motor can be effected accurately without the necessity of adjustments of various elements. The device detects a current flow in a field winding of an energized phase and compares it with a simulated saturation curve to detect a back EMF induced in the winding to find a current position of the rotor of the motor. The simulated saturation curve is produced by energizing the winding with a low voltage, measuring current flows in the winding as voltage signals at three different points of time, and calculating several data indicating a saturation curve from the voltage signals. The data are stored in memory and recalled one after another to produce a corresponding voltage when the field winding is energized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.