Discrete-continuous electromechanical control systems with passive adaptation

Abstract

Issues in constructing discrete–continuous electromechanical control systems with functions of adaptation to changes of settings that influence the parameters and motion sensor characteristics, such as speed or position of an operating element of a mechanism that has been set in motion, have been discussed. Because the adapters of such systems do not participate directly in the correction of control action of electric drivers, such systems are called “conditionally adaptive” or “systems with passive adaptation.” Generally, passive adaptation systems allow significantly reducing the sensitivity of the closed-loop control systems of electric drives to variations of its parameters. However, such systems can also perform the functions of parametric adaptation of previous filters of electromechanical control systems or information-measuring converters, solving the tasks of constructing a reference change in a coordinate of a system. In this case, zero-order holds play a key role in the processes of conversion of information on signals of additive actions of electric drivers and motion sensors to the piecewise-continuous analog or digital signals. The present work shows that zero-order holds operating in the regimes with variable frequency of information sampling allow on to significantly extend the functionality of electric drives both with respect to the quality factor of control of electric drives with variable motor drive control and with respect to savings in time in processing of measured data due to the possibilities of data compression. The generalized functional structure of passive adaptive discrete-continuous electromechanical control systems with such zero-order holds is presented. In addition, simulation results in the Matlab/Simulink environment of passively adaptive system regulating the speed of a dc electric drive with a discrete proportional–integral speed regulator and quasi-invariant system of speed control with a discrete state regulator equipped with setting devices of intensity and speed sensors with zero-order holds that confirm the effectiveness of the proposed technical solutions are presented.