System of mutual loading of auxiliary electric machines with coverage of losses from mechanical power sources

Abstract

Purpose. Increasing the level of safety and reducing the cost of rolling stock maintenance is an urgent problem for Ukrainian railways today. Existing test benches for auxiliary machines are usually built according to the scheme with direct loading of the tested electric machine and do not meet modern requirements for the quality and energy efficiency of testing. In this regard, there is a need to design energy-efficient test benches for testing auxiliary machines of electric rolling stock. Methodology. To achieve this goal, we used an analytical method of research to determine the optimal structure of the test bench. The paper considers the voltage balance diagram in the mutual load system. Separately, the calculations are presented, on the basis of which the design diagrams of the electrical and mechanical parts of the test bench are constructed, and the conditions for covering all losses in the mutual load system are determined using the design diagrams. Findings. In the course of the research, the power balance equation in the mutual load system was obtained. On the basis of the equations, a model of a mutual load system with coverage of all losses from a single source of mechanical power was built. The main advantage of the developed model is that it can be implemented both by numerical calculations using composite systems of equations and by object-oriented programming in specialized software systems. Originality. A rational scheme for testing auxiliary machines with the coverage of losses from a single source of mechanical power is proposed. The use of a single power source can significantly reduce the additional consumption of electrical energy due to the more efficient use of auxiliary equipment, in particular, a mechanical power source. Practical value. Based on the results obtained, it is possible to determine the parameters of the scheme for testing auxiliary machines at the design stage of the test bench. Implementation of the research results at auxiliary machine repair enterprises will reduce electricity consumption for post-repair testing due to the higher energy efficiency of the test scheme.