ON THE APPLICATION OF AMPLITUDE OPTIMUM FOR DIGITAL CONTROL IN ELECTRIC DRIVES

Abstract

The increasing use of microcomputers for control of electric drives causes an increased interest in optimization rules for digital controllers. For industrial applications in many cases the well-known optimization procedures for analog control according to the ampli- tude optimum (Kessler) result in an acceptable dynamic behaviour. Basic consideration of this paper is to use the statement of this optimization for sampled-data control of electric drives. By approximation of the computed equations for controller parameter adjustment simple optimization rules are obtained again. The application of the equations and the efficacy of the controller parameters is investigated by digital simulation of the control loops and oscillograms of a real drive. An important detail of this design procedure con- sists in the search of a simple rectifier model to reduce the order of the overall z-transfer function for the controlled process.