Mathematical model development for the study of thermal processes of an asynchronous motor in the FC-IM system
Students Name: Martynyk Vitalii Volodymyrovych
Qualification Level: magister
Speciality: Electrical Energetics, Electrical Engineering and Electromechanics
Institute: Institute of Power Engineering and Control Systems
Mode of Study: full
Academic Year: 2022-2023 н.р.
Language of Defence: ukrainian
Abstract: Measuring the temperature of the motor windings, stator, casing, etc., is one of the necessary diagnostic factors for determining the condition of the motor, its reliability and service life. Reliable information about the current thermal state of the electric motor allows you to provide, first of all, the protection of the electric motor against possible emergency modes associated with temperature changes. In the first chapter, an analysis of various methods of temperature measurement in asynchronous motors was carried out, their technical capabilities, advantages and disadvantages were described. Indirect methods have become the most widely used in industry along with thermistors for a wide range of powers and types of motors. Indi-rect methods are based not so much on the direct measurement of the temperature of engine parts, but on the calculation of the integral temperature from the given or meas-ured values of the magnitude and shape of the current and voltage. [1] The second chapter shows the features of modeling asynchronous motors, high-lights the main dependencies of the model. Models of induction motor and frequency converters are also described. Graphical dependences of different operating modes of induction motor in the IF-AD system are given [2]. In the third chapter, the issue of the model synthesis of the temperature measure-ment unit, which allows to study and analyze the system with induction motor, in which overheating and heat loss are taken into account, is developed. The influence of exter-nal and internal factors on thermal processes in sucm motor is described in this quali-fication paper. . In the fourth chapter, the results of the study, various characteristics, evaluation of parameters and their influence on the induction motor operating are given. Namely, 7 the effect of changing the frequency element on thermal processes, the effect of chang-ing the frequency on thermal processes, various control laws were investigated [3,4]. Study object of this qualification work is an asynchronous motor with squirrel cage powered and controlled by a frequency converter. Scope of research to develop a mathematical model for the study of thermal processes in the IF-AD system, for the qualitative choice of the control law, engine design, and control method. Goal of research - to develop a mathematical model for the study of thermal pro-cesses in the IF-AD system, for the qualitative choice of the control law, engine design, and control method. References: 1. Ryzhkov A.A. "Determining the parameters of the thermal scheme of the re-placement of an asynchronous motor on the basis of experimental data", Melito-pol, Ukraine, "Tavrii State University of Agricultural Technology" .(Ukrainian). 2. Usoltsev A.A. "Vector Control of Asynchronous Motors" Study Guide for Elec-tromechanical Cycle Disciplines, 2002. (Ukrainian). 3. O.P. Chorniy, O.V. Lugovy, D.Y. Rodkin, G.Yu. Sysyuk, O.V. Sadovy "Mod-eling of electromechanical systems", Kremenchuk, 2001. (Ukrainian). 4. M.M. Fedorov, "Dynamic thermal models of electrical machine assemblies", 2005. (Ukrainian).