Digital servo control system.

摘要

To provide a digital servo control system in which the number of bits required in calculation (dynamic range) does not depend on the amplitude of a target value, state variables of a plant 30 are inputted to an inverse system 34 having an opposite characteristic to an internal model 32 and output of the inverse system 34 is inputted to the internal model 32. If the state variables of the plant 30 cannot be directly observed, a state estimator 40 is used. In that case, the inverse system 34 receives input and output of the plant 30 and provides output thereof to the state estimator 40. Input of the internal model 32 may be inputted to the state estimator 40 instead of inputting the input of the plant 30 to the inverse system 34. <IMAGE>