tailieunhanh - Passive friction compensation using a nonlinear disturbance observer for flexible joint robots with joint torque measurements

The friction and ripple effects from motor and drive cause a major problem for the robot position accuracy, especially for robots with high gear ratio and for high-speed applications. In this paper we introduce a simple, effective, and practical method to compensate for joint friction of flexible joint robots with joint torque sensing, which is based on a nonlinear disturbance observer. | Passive friction compensation using a nonlinear disturbance observer for flexible joint robots with joint torque measurements