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Task-space regulation of robots with approximate actuator model

Published online by Cambridge University Press:  28 January 2003

C.C. Cheah
C.C. Cheah
Affiliation:
School of Electrical and Electronic Engineering, Nanyang Technological University, Block S1, Nanyang Avenue, Singapore 639798
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Abstract

Though many research efforts have been devoted to developing robot controllers with uncertainties in the robot dynamics, most research so far has assumed that the model of actuator is known exactly. In implementing the robot controllers, calibration is necessary to identify the exact parameters of the actuator model. When there is an error in calibrating or modeling, it is unknown whether the stability of the system could still be guaranteed. In addition, the actuator model could change as the temperature varies due to overheating of the motor or changes in the ambient temperature. To overcome this problem, we propose in this paper, a task-space controller for the regulation of the robot with an approximate actuator model. We consider second-order dynamics of electric actuators with negligible armature inductances. Sufficient conditions for choosing the feedback gains are presented to guarantee stability.

Keywords

StabilitySetpoint controlUncertain Actuator Model
Type
Research Article
Information
Robotica , Volume 21 , Issue 1 , January 2003 , pp. 95 - 104
Copyright
© 2003 Cambridge University Press

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