Abstract
The negative impact of non-uniformity of current distribution in the power circuit of a freight direct current rolling stock on its operation efficiency was experimentally established. In contrast to existing approaches, the presented study reveals the entire range of factors that together affect non-uniformity of current distribution. The method of calculation of comprehensive influence of structural, technological and operational factors on current distribution was developed. It made it possible to determine conditions of elimination of the difference of currents and to increase traction properties of locomotives when controlling freight trains. The proposed coefficients allow analyzing the effect of various factors on current distribution and relationship between parameters of motors, connected in parallel. They visually show that deviation of currents at interaction of a locomotive with freight wagons affect not only particular parameters of wheel-motor units, but also their connection. The merit of this approach is the possibility of evaluation of non-uniformity of current distribution depending on the structure of electric machines and connection of structural parameters of a wheel-motor unit. Results of the study can be used during repairs of freight direct current rolling stock and in designing automatic control systems.
Highlights
The task to improve operation efficiency of traction rolling stock has remained relevant over the entire period of existence of railways
Scientific research and new technical solutions have led to significant progress in this direction in recent years
The study of current distribution was performed at the locomotive DE1 using the on-board diagnostics systems “Magistral-DE1”, which is installed in each section
Summary
The task to improve operation efficiency of traction rolling stock has remained relevant over the entire period of existence of railways. Scientific research and new technical solutions have led to significant progress in this direction in recent years. Given the advances in the fields of chemistry, materials science, industrial electronics, etc., the latest element base and materials became available for rolling stock and significantly decreased the costs of transportation, increased speed and reliability of rolling stock. It is worth noting that an up-to-date locomotive is a complex, multi-purpose developed system. This predetermines the relevance of research into improvement of rolling stock via determining and formal description of internal relations between elements of a given system
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