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When a helicopter is required to hover with minimum deviations from a desired position without measurements of a persistent wind disturbance, a robustly stabilizing control action is vital. In this paper, the stabilization of the position and translational velocity of a nonlinear helicopter model affected by a wind disturbance is addressed. The wind disturbance is assumed to be a sum of a fixed number...
This paper proposes a sensorless speed control scheme based on a model reference adaptive control (MRAC) and it is applied to a Single-Phase Induction Motor. The rotor speed control algorithm is based on robust model reference adaptive controller (RMRAC). The speed estimation technique is obtained from a MRAS (Model Reference Adaptive System) algorithm, based on the motor reactive power calculation...
in this paper, a new control approach is proposed using adaptive integral backstepping controller (AIBC) for controlling an autonomous rotorcraft. The recursive Lyapunov methodology in the backstepping technique will ensure the system stability, the integral action will increase the system robustness against disturbances and model uncertainties, and the adaptation law will estimate the modeling errors...
This work addresses the analysis and the design of an adaptive fuzzy sliding-mode observer applied to vector control of an induction motor. The conception steps for the conventional sliding-mode speed observer (SMO) are laid down clearly. In this work, the drawbacks of SMO in terms of high observer gains and chattering phenomenon due of switching surface are overcome by merging of fuzzy logic with...
An fuzzy gain based adaptive fuzzy logic controller (FLC) is developed for the speed control of brushless DC motor (BLDCM) drive in this paper. In a FLC, the way to improve the performance of the FLC is to tune the fuzzy rules, membership function and scaling gains of inputs and output. The scaling gains of the inputs and output of the proposed fuzzy controller are parameters that can be tuned conveniently...
In this document a new proposal of speed vector control of induction motors based on robust adaptive VSC (variable structure control) law and its experimental validation are presented. This control scheme uses the SVPWM (space vector pulse width modulation) instead of the traditional current hysteresis comparator, because the space vector modulator eliminates the instability risk when the motor works...
In this paper, an adaptive flux observer is designed for a speed sensorless direct torque controlled induction motor drive in which the rotor resistance value is updating during operation and a new speed-adaptive law is given. By using robust control theory, the constant observer gain is obtained by solving two bilinear matrix inequalities. The stability of the flux observer is ensured in a sufficiently...
In order to improve the reliability and adaptability of control system induction motor, a speed sensorless vector control system for induction motor based on DSP (TMS320F240) is presented. Combined with a rotor flux and speed observer based on a PI model reference adaptive system (MRAS), a speed sensorless field-oriented control (FOC) system for induction motors is introduced. The motor speed is estimated...
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