Optimization of standards of repair runs in locomotives series 2(3,4)es5k on the basis of failures of the traction motor

System of preventive maintenance and maintenance of the operable condition of the traction rolling stock. The subject of a global study of failures of traction motors in the event of a breakdown on the territory of the service locomotive depot «Dalnevostochnoye» and «Primorskoye» for 2019. The purpose of the study is to determine the possible norms of overhaul runs for the considered node in order to achieve the optimal number of locomotive calls for unscheduled repairs. In the work, the correct law of distribution of traction motor (TED) failures, the determination of the Sturgess, Pearson coefficients and other methods of mathematical statistics and the theory of justification of systems. The article defines an element that limits the norms of overhaul runs of traction motors; the theoretical distribution of traction motor failures due to a decrease in the insulation resistance of its windings has been obtained. As part of the study, the optimization of the norms of overhaul runs was carried out according to the conditions for conducting maintenance regarding the traction motor. As a result of the analysis of the causes of failures, it was found that more cases of placing locomotives for unscheduled repairs occur in the first mileage interval of locomotives due to poor quality diagnostics at TR-1 upon measuring the resistance of the insulation windings. Most of the failures occurring in the first period of operation are not associated with a change in the reliability of the considered node. When considering two normal peaks of failures, falling on the operating time intervals 14-21 and 28-35, the necessity of optimizing the norms of overhaul runs is determined. When considering two normal peaks of failures, falling on the operating time intervals 14-21 and 28-35, the necessity of optimizing the norms of overhaul runs is determined. The practical significance of the study lies in the possibility of using the option of optimizing the norms of overhaul runs to adjust the norms of maintenance and repair periods within specific depots.