Abstract

Conventional fuzzy controllers for the motion tracking of robotic manipulators utilize two input variables, position errors and velocity errors, to deal with highly nonlinear and time-varying dynamics associated with robot motion, and position errors usually remain at steady state conditions. In order to eliminate the steady state position errors, a new fuzzy control algorithm is proposed using three input variables of the fuzzy controller: position error, velocity error, and integral of position errors. Simulation and experiment studies show that the position errors at steady state are decreased more than 90% compared to those of conventional fuzzy control when the proposed fuzzy control is applied to the 2-axis direct-drive SCARA robot.

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