Sliding mode control based on pole-placement method for position control of linear stage

The sliding mode control method is one of the robust control techniques and a particular type of variable structure control. Sliding mode control can change the system performance on the switching surface. In this paper, a sliding surface design method using the pole-placement method for the sliding mode control and then experimentally analyzes the advantage to this method when used in a linear position system. Also, this control input with chattering behavior is not acceptable for systems intended to control electric motors and power converters. One possible solution in this paper is to make use of the sigmoid-like function instead of signum function.