Abstract
The servo control system of Giant Steerable Science Mirror(GSSM) prototype have been designed to meet the requirements. The structure model is established using lump mass model based on finite-element data. The model of nonlinear disturbance models such as friction model, encoder model and torque ripple model are discussed. The servo control system are consists of current loop, rate loop, position loop, structure, motor and encoders. The performance of servo control system with nonlinear errors is simulated.
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