Families of Frequency Characteristics, as a Basis for the Identification of Asynchronous Electric Drives

Abstract

The article substantiates the necessity of identifying the dynamics of asynchronous electric drives with frequency control. It is proposed to use nonlinear transfer functions and the formula of a family of frequency characteristics of an electric drive, depending on the frequency of the stator voltage and slip. The experiments and simulations, confirming theoretical conclusions, are presented. The frequency characteristics of the drive of the stand calculated by the proposed method allowed to explain those problems of frequency control that were not explained by traditional methods - analytical, vector diagrams, substitution schemes, etc. The same technique allowed us to formulate a structural correction of the AEP, which improves the dynamics of the drive by almost two times, making it commensurate with the dynamics of motors with permanent magnets. This correction will allow the use of asynchronous electric drives in precise technologies, including in the drives of industrial robots.