Disturbance observer-based nonlinear friction compensation in table drive system

This paper presents a disturbance observer-based algorithm for nonlinear friction compensation in table drive systems to achieve the high accurate trajectory control. In order to design an effective compensator, dynamic characteristics of the friction are examined and, as a result, a simple and high accurate observer can be designed on the basis of the analyzed friction characteristic. Using the disturbance observer based compensation, the precise velocity/position control can be attained without the response delay which is caused by the restricted control bandwidth in conventional compensation algorithms. Experimental results show the significant performance improvement of the proposed algorithm in the trajectory control with low feed rate and velocity reversal motion.

[1]  R.D. Lorenz,et al.  Experimental identification of friction and its compensation in precise, position controlled mechanisms , 1991, Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting.

[2]  Nobuyuki Matsui,et al.  Observer-based nonlinear friction compensation in servo drive system , 1996, Proceedings of 4th IEEE International Workshop on Advanced Motion Control - AMC '96 - MIE.

[3]  T. Matsubayashi,et al.  Some Considerations on Characteristics of Static Friction of Machine Tool Slideway , 1972 .