Abstract
This article is devoted to development of a method for calculating the parameters of an asynchronous motor of an electric locomotive with asymmetrical windings of stator and rotor. A method for determining self and mutual inductances of the stator and rotor phases of an asynchronous motor with asymmetric windings and their relations to mechanical variables is proposed. It is based on comparing two equations of stored magnetic energy, one equation calculated through induction, magnetic field strength and geometrical dimensions and another equation calculated through the parameters of the motor circuits. It is shown that the obtained solutions correspond to the previously existing methods, but they give the additional possibilities in mathematical modeling. The proposed technical solution allows higher accuracy developing of a mathematical model of a drive with an asynchronous motor having asymmetrical stator and rotor windings for studying dynamic processes during the operation of the specified drive, in particular, the drive of auxiliary machines for electric locomotive, where an asynchronous motor with asymmetrical stator windings is used as a phase release.
Highlights
The search for effective methods for obtaining a picture of dynamic processes in an electric drive with an asynchronous electric motor and the study of the operating modes of electric machines for specific technical applications require a reasonable choice of the most appropriate method for the given case of mathematical modeling of the indicated electric drives
The mathematical models, obtained with the help of these methods, allow to investigate dynamic processes in electric drives with asynchronous motors and to study the operating modes of electric machines under the condition of symmetry of the stator and the rotor windings and with a high-quality power supply system of the electric machine. This is an evidence that the topic of researches devoted to the development of mathematical models of asynchronous motors with asymmetrical windings and with asymmetry and non-sinusoidal of the supply voltage system, as well as the development of methods for determining the parameters of an asynchronous motor applied in these models, is relevant
The following question remains, i.e. what parameters of an asynchronous motor can be determined having an information about phase currents and voltages, which is relevant for creating a mathematical model of an asynchronous motor under conditions of power supply from the system with a source of poor-quality electrical energy
Summary
The search for effective methods for obtaining a picture of dynamic processes in an electric drive with an asynchronous electric motor and the study of the operating modes of electric machines for specific technical applications require a reasonable choice of the most appropriate method for the given case of mathematical modeling of the indicated electric drives. The mathematical models, obtained with the help of these methods, allow to investigate dynamic processes in electric drives with asynchronous motors and to study the operating modes of electric machines under the condition of symmetry of the stator and the rotor windings and with a high-quality power supply system of the electric machine. This is an evidence that the topic of researches devoted to the development of mathematical models of asynchronous motors with asymmetrical windings and with asymmetry and non-sinusoidal of the supply voltage system, as well as the development of methods for determining the parameters of an asynchronous motor applied in these models, is relevant
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