Hysteresis synchronous motor rate servo system
US4143311A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 30, 1976 |
| Grant date | Mar 6, 1979 |
| Priority date | — |
| Expiry date | Sep 30, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P25/024
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A servo control system for maintaining a direct current motor in operation at a constant speed is provided with two velocity feedback control loops. One feedback control loop is a rate damping loop which responds quickly to minor variations in motor speed to hold the motor at a predetermined command speed. The other loop is a steady state error loop through which a command speed is fed and which responds much more slowly to variations in command speed. The utilization of dual velocity control loops allows the servo system to adjust motor speed quickly in response to deviations in actual motor speed from commanded speed, yet is sensitive to low frequency variations in velocity feedback such as result from disturbances in motor loading.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.