1,721,085 research outputs found
Adaptive learning control for robotic manipulators driven by permanent magnet synchronous motors
No full textInsights on observability and identifiability properties of induction motors at steady-state
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Nonlinear adaptive speed tracking control for sensorless permanent magnet step motors
No full textAssuming that only stator currents and voltages are available for feedback, a nonlinear output feedback adaptive speed tracking control strategy is proposed for a permanent magnet step motor with unknown load torque. It relies on three new theoretical results: the "s-alignment" and "c-alignment" procedures, in which the motor is forced to reach certain known equilibrium points, and an output feedback controller which guarantees uniform asymptotic speed tracking for every initial condition belonging to an explicitly computed domain of attraction. Global exponential convergence is achieved in the case of known load torque. Numerical simulation results show the effectiveness of the proposed solution
A nonlinear adaptive speed tracking control for sensorless permanent magnet step motors with unknown load torque
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An adaptive tracking control from current measurements for induction motors with uncertain load torque and rotor resistance
No full textThe problem of controlling sensorless induction motors with uncertain constant load torque and rotor
resistance on the basis of stator current measurements only is addressed. A new eighth-order dynamic
nonlinear adaptive control algorithm is designed, which relies on a closed loop adaptive observer for
the unmeasured state variables (rotor speed and fluxes) and for the uncertain parameters and is not
based on non-robust open loop integration of flux dynamics. Local exponential stability of the closed
loop tracking and estimation error dynamics is achieved under persistency of excitation conditions which
restrict the reference signals and may be interpreted in terms of motor observability and rotor resistance
identifiability
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