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Effect of motor dynamics on nonlinear feedback robot arm control

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4 Author(s)
Tarn, T. ; Dept. of Syst. Sci. & Math., Washington Univ., St. Louis, MO, USA ; Bejczy, A.K. ; Yun, X. ; Li, Z.

A nonlinear feedback robot controller that incorporates the robot manipulator dynamics and the robot joint motor dynamics is proposed. The manipulator dynamics and the motor dynamics are coupled to obtain a third-order-dynamic model, and differential geometry control theory is applied to produce a linearized and decoupled robot controller. The derived robot controller operates in the robot task space, thus eliminating the need for decomposition of motion commands into robot joint space commands. Computer simulations are performed to verify the feasibility of the proposed robot controller. The controller is further experimentally evaluated on the PUMA 560 robot arm. The experiments show that the proposed controller produces good trajectory tracking performances and is robust in the presence of model inaccuracies. Compared with a nonlinear feedback robot controller based on the manipulator dynamics only, the proposed robot controller yields conspicuously improved performance

Published in:

Robotics and Automation, IEEE Transactions on  (Volume:7 ,  Issue: 1 )

Date of Publication:

Feb 1991

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