Abstract
The analysis of operating conditions of induction traction motors as part of traction electric drives of electric locomotives reported here has revealed that they are powered by autonomous voltage inverters with asymmetric non-sinusoidal voltage. It was established that the induction motor operation may be accompanied by defects caused by the asymmetrical modes of the motor stator. A model of the induction motor has been proposed that takes into consideration changes in the values of mutual inductance of phases and complete inductance of the magnetization circuit due to changes in the geometric dimensions of the winding caused by a certain defect. An algorithm that considers the saturation of the magnetic circuit of the electric motor has been proposed. This approach to modeling an induction motor is important because if one of the stator's windings is damaged, its geometry changes. This leads to a change in the mutual inductance of phases and the complete inductance of the magnetization circuit. Existing approaches to modeling an induction motor do not make it possible to fully take into consideration these changes. The result of modeling is the determined starting characteristics for an intact and damaged engine. The comparison of modeling results for an intact engine with specifications has shown that the error in determining the controlled parameters did not exceed 5 %. The modeling results for the damaged engine demonstrated that the nature of change in the controlled parameters did not contradict the results reported by other authors. The discrepancy in determining the degree of change in the controlled parameters did not exceed 10 %. That indicates a high reliability of the modeling results. The proposed model of an induction electric motor could be used to investigate electromagnetic processes occurring in an electric motor during its operation as part of the traction drive of electric locomotives
Highlights
It is impossible to manage railroad electric rolling stock efficiently without optimal control over all its components [1, 2]
Studying electrodynamic processes in the traction electric drive of the electric rolling stock requires that its simulation model should be built, which would make it possible to determine certain parameters of it with high accuracy [5]
The analysis revealed that the nature of change in these parameters does not contradict the data given in works [29, 30], which studied the inter-turn short circuit in the stator windings of the induction motor
Summary
It is impossible to manage railroad electric rolling stock efficiently without optimal control over all its components [1, 2]. Constructing a mathematical model of the induction traction electric motor providing for the possibility of examining the asymmetric modes of the stator, taking into consideration the saturation of the magnetic circle and losses in the magnetic circuit, would make it possible to achieve high accuracy in the calculations of electrodynamic processes in the electric motor. Such a model could enable determining with high accuracy the energy indicators of both the traction electric motor and the traction drive of the electric locomotive. This testifies to the relevance of the topic of this study involving the modeling of the induction traction motor operation
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