Abstract
Fast motion along a predefined path is important in many robot applications, and requires utilization of the maximum allowable torque range. If the torque is at the limit, there is no margin to cope with disturbances or modeling errors, which may result in deviation from the path. A path velocity controller for modification of the velocity along the path when the torques saturate can improve path tracking. An experimental evaluation of such a controller on an industrial robot is presented. The experimental results demonstrate how minimum time optimization can be used in a nonideal situation, and how the path velocity controller is able to compensate for time variations in the robot dynamics.
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