Abstract
This paper proposes a nonlinear observer-based controller designed to compensate for friction in harmonic drives with hysteresis. Hysteresis in a harmonic drive is described by a nonlinear differential equation representing the combination of nonlinear stiffness and nonlinear friction. Nonmeasurable friction is derived using a nonlinear observer to provide asymptotic stability and position tracking. The performance of the proposed system is confirmed by computer simulation.
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