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In the practical application, Brushless DC motor (BLDCM) faces various disturbances including parametric uncertainties, load disturbance and unmodeled dynamics. These disturbances can be divided into two types of periodic disturbances (sinusoidal/cosinoidal) and aperiodic (slowly-varying or constant) disturbances. Velocity ripples can be seen as the result of a plurality of periodic interference signals...
The controller design of the drag-free satelLite on near-earth orbit is the researching object. After analyzing the characteristics of the main disturbances affecting the drag-free satelLite, the disturbance model is estabLished. Adding the disturbance to the system, a disturbance observed based dynamics model of the drag-free satelLite is built. Then the mixed controller is designed and the LMI form...
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