Compensation of stick-slip effect in an electrical actuator

Abstract

In some mechanical systems which make very small motions like industrial wagons or constructor robots, the dispositive of their control usually presents some imperfections, a succession of jumps and stops, when the static friction force is larger than the dynamic friction force. This effect is called the stick-slip phenomenon. In this paper, we develop a nonlinear observer in order to estimate the friction force of the contact during the motion, and to compensate the effects which cause the stick-slip phenomenon.