An approach for generating high velocity and high acceleration trajectories of industrial robots

For fast-motion industrial robots, the limits of the velocity and the acceleration vary over the whole work-space. To make industrial robots move with fully high velocity and high acceleration along the specified trajectory in the entire workspace, a trajectory generation technique for fast-motion industrial robots is presented in this paper. The maximum possible values of the velocity and the acceleration along the specified trajectory are firstly investigated, in consideration of the speed and torque limits of the actuators. Then, based on these maximum velocity and maximum acceleration, the proposed technique generates various motion profiles by using coefficients which are determined by the acceleration and deceleration characteristics. Finally, the experiment is conducted to confirm the proposed technique by commanding a two-degree-of- freedom (2-DOF) direct-drive planar parallel robot to move along the trajectories with the unsymmetrical smooth motion profile generated by the proposed technique.