Servo system
US4054820A · kind A · utility
19Cited by
5References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 31, 1975 |
| Grant date | Oct 18, 1977 |
| Priority date | — |
| Expiry date | Jul 31, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D3/20
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A closed-loop servo system in which the parameter to be controlled is caused to follow a predetermined profile by approaching the profile, if there is an error, at a rate independent of the magnitude of the error. The system repeatedly tests for an error and adjusts a control input by a predetermined step each time one is found. In a preferred implementation the velocity of a d.c. motor is controlled by means of an up/down counter the value of which controls the motor current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.