Motion reproducing system for pinching and rotational tasks with different size of objects by using a transformation to polar coordinates

This paper proposes a motion reproducing system for human pinching and rotational tasks in the two dimension. By using coordinate transformation to polar coordinates from Cartesian coordinates of grasping motion, internal force control and attitude control motions are able to reproduce independently. Proposed method makes it possible to reproduce human pinching and rotational motions even if the size of target objects are different compared to motion saving phase. In the experiments, results demonstrate that conventional method to deal with the difference about the size of objects cannot reproduce the motions concern pinching motions and validity of the proposed method is confirmed.