Maryam Baluchzadeh - Phd Graduated, Department of Electrical Engineering, Ferdowsi University of Mashhad Mashhad, Iran

This paper presents robust optimal control of Servomotor Positioning System in presence of uncertainties. Theuncertainties include the external disturbance and parametric uncertainty and bounded unknown nonlinear term. In thispaper, Discrete Linear Quadratic (DLQ) control has been efficiently applied to certain systems as an optimal control.There would seem to be some difficulties to apply discrete linear quadratic control to uncertain Servomotor PositioningSystem. In order to apply the discrete linear quadratic to uncertain Servomotor Positioning system with lumpeduncertainty that it is compensated by robust time delay. The stability analysis and simulation verify effectiveness of theproposed control approach.

Servomotor Positioning System , uncertainties, disturbance, parametric uncertainty