AUTHORS: Mahmoud Mohammad Al-Suod, Ushkarenko Oleksandr

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ABSTRACT: This paper considers the principles of mathematical description of model elements in variablefrequency induction motor control systems for determining their component and structural composition and analyzing data conversion processes in the interaction between all the subsystems of a microprocessor-based control system and in the process of its structure optimization. The authors propose a method of formalizing operation processes of the control system elements, such as a transformer, a rectifier, a passive filter, an inverter, an induction motor, a microprocessor-based control system, and instruments for measuring and displaying information. A structural and functional model of a microprocessor-based variable-frequency control system of an induction motor has been developed. The rules for describing functional structures at various levels of decomposition of the variable-frequency induction motor control system have been determined. The approach proposed in this paper enables moving from various structural and principal diagrams to their mathematical models for the following analysis and optimization. Analytical expressions describing the structure and signals conversion processes in certain subsystems of the induction motor control system became available. The analysis of these expressions allows drawing the conclusion that it is possible to structurally optimize the reference model by means of replacing a variety of separate blocks by a single microcontroller, in which the control algorithm is programmatically implemented. On the basis of analysis of analytical expressions describing the control system model elements, the composition of feedback signals necessary for implementation of the function of induction motor control was determined.

KEYWORDS: Induction motor, modeling, variable-frequency control, optimization, analytical description

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