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The problem of attitude tracking control for rigid satellite is studied in this paper. Based on the dynamic equation and kinematics equation using error quaternion and error angular velocity, a sliding mode controller is initially designed to solve this problem. In order to avoid inherent chattering of sliding mode control and then improve control effect, a disturbance observer is introduced and included...
This paper proposes a novel sliding mode reference adaptive system(SM MRAS) observer for speed identification in a sensorless direct torque control induction motor system. The SM MRAS method uses the voltage model (VM) as reference and the current model (CM) as adjustable model to estimate the motor speed by combining MRAS with sliding mode variable-structure control to formulate a slide mode surface...
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