A study on the improvement of servo performance of CNC machine tools (improvement of the servo tracking error)

摘要

The well-known methods for improving servo tracking performance are (1)increasing control- ler gain higher and (2)applying a feed-forward term. However, the former is limited by the stability of the system and the latter is also limited because in implementing a feed-forward controller, the command input needs to be differentiated, which may cause ripple or machine vibration. The controller proposed in this paper can achieve equivalenthigh gain performance by using compara- tively lower position gain.