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This study proposes a model-based force estimator with an adaptive tuner for a single active magnetic bearing suspended rotor system to eliminate the vibration associated with imbalance of mass. The adaptive tuner is added to the integral-typed observer to overcome the estimation error caused by the parameter uncertainty and the model uncertainty. Simulation results show that the adaptive estimation system is more accurate than the integral-type estimator, even though the system model has a 20% parameter error, and the feed-forward compensator can ameliorate the rotational accuracy in the operational range.