Analysis of Stability of Electric Drives as Non-linear Systems According to Popov Criterion Adjusted to Amplitude and Phase Frequency Characteristics of Its Elements

Abstract

The main method for assessment of performance of automatic control systems is assessment of stability of a system as it allows the evaluation of dynamics and accuracy as well as the method for additional adjustment and technological capacity of the whole complex comprising the system. In the suggested paper the known criterion of stability for non-linear systems by Popov is based on non-linear frequency characteristics. It allows the development of conditions of stability and methods of adjustment for such complex systems as servo drives with non-rigid mechanics and alternating-current systems which cannot be analyzed with the help of known methods.