An observer-based state feedback controller design for robot manipulators considering actuators' dynamic

In this paper a state feedback controller is designed for Rigid Link Electrically-Driven (RLED) manipulators actuated by a brushed DC (BDC) motors based on joint velocity estimation. The observer based controller is in fact a model based controller but it can be shown practically that the method is robust against parametric uncertainties. Initially pseudo-velocity filter is proposed to estimate the joint's velocity, provided joint's position are measured. Using the measured and estimated states, a controller is designed through the direct Lyapunov method. It is shown that the controller is asymptotically stable in it's region of attraction, both in position and velocity tracking. To show the validity of the proposed scheme, the algorithm is implemented on a two link planar manipulator actuated by BDC motors.