Method of controlling a high-friction electro-mechanical servo-mechanism to minimize the power needed to hold a loaded output member
US7015670B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 14, 2004 |
| Grant date | Mar 21, 2006 |
| Priority date | — |
| Expiry date | May 14, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B13/024
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The invention provides a method for controlling an electromechanical servomechanism (20) for moving an output member relative to a variable load (38). The servomechanism includes: a motor (37) having at least one coil (32A, 32B or 32C) adapted to be supplied with current and having a rotor (33) with an output shaft (35); a mechanical transmission (36) arranged between the output shaft and the load, the transmission having a mechanical friction related to the load; a servoamplifier (30) arranged to supply current to the motor coil in response to an input signal (in line 29); a command signal (in line 21) for commanding the position of the load; a load position feedback signal (in line 23) compared (in summing point 22) to the command signal and arranged to produce an error signal (in line 24); and means (28) for generating an offset signal (in line 26) that is summed (in summing point 25) with the error signal to modify the servoamplifier input signal (in line 29). The improved method comprises the steps of: generating the offset signal as a function of the command and feedback signals and the currents supplied to the motor coil after the position of the output member as remained su…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.