Position control in a D.C. motor
US4689540A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 1986 |
| Grant date | Aug 25, 1987 |
| Priority date | — |
| Expiry date | May 12, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S388/922
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A position control system for positioning a D.C. motor at a desired position operates in a speed detection mode in which the D.C. motor is driven to rotate at a predetermined high speed, and in a position detection mode wherein the position of the D.C. motor is precisely controlled. In the speed detection mode, the control circuit forms a phase-locked-loop (PLL) control circuit which compares the phases of the speed instructing pulse signal and the rectangular signal derived from the actual rotation of the D.C. motor. The motor speed is controlled in accordance with the phase difference between the speed instructing pulse signal and the rectangular signal derived from the actual rotation of the D.C. motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.