19,946 research outputs found
Adaptive control system for line-commutated inverters
A control system for a permanent magnet motor driven by a multiphase line commutated inverter is provided with integration for integrating the back EMF of each phase of the motor. This is used in generating system control signals for an inverter gate logic using a sync and firing angle (alpha) control generator connected to the outputs of the integrators. A precision full wave rectifier provides a speed control feedback signal to a phase delay rectifier via a gain and loop compensation circuit and to the integrators for adaptive control of the attenuation of low frequencies by the integrators as a function of motor speed. As the motor speed increases, the attenuation of low frequency components by the integrators is increased to offset the gain of the integrators to spurious low frequencies
Global stabilization of multiple integrators by a bounded feedback with constraints on its successive derivatives
In this paper, we address the global stabilization of chains of integrators
by means of a bounded static feedback law whose p first time derivatives are
bounded. Our construction is based on the technique of nested saturations
introduced by Teel. We show that the control amplitude and the maximum value of
its p first derivatives can be imposed below any prescribed values. Our results
are illustrated by the stabilization of the third order integrator on the
feedback and its first two derivatives
Multivariable control systems with saturating actuators antireset windup strategies
Preliminary, promising, results for introducing antireset windup (ARW) properties in multivariable feedback control systems with multiple saturating actuator nonlinearities and integrating actions are presented. The ARW method introduces simple nonlinear feedback around the integrators. The multiloop circle criterion is used to derive sufficient conditions for closed-loop stability that employ frequency-domain singular value tests. The improvement in transient response due to the ARW feedback is demonstrated using a 2-input 2-outpurt control system based upon F-404 jet engine dynamics
A Bound on the Number of Integrators Needed to Linearize a Two-input Control System
For nonlinear control systems with two inputs we consider the problem of dynamic feedback linearization. For a restricted class of dynamic compensators that correspond to adding chains of integrators to the inputs, we give an upper bound for the order of the compensator that needs to be considered. Moreover, we show by an example that this bound is sharp
Global stabilization of linear systems with bounds on the feedback and its successive derivatives
We address the global stabilization of linear time-invariant (LTI) systems
when the magnitude of the control input and its successive time derivatives, up
to an order , are bounded by prescribed values. We propose a
static state feedback that solves this problem for any admissible LTI systems,
namely for stabilizable systems whose internal dynamics has no eigenvalue with
positive real part. This generalizes previous work done for single-input chains
of integrators and rotating dynamics
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