INCREASING THE MOVEMENT SPEED OF AC ELECTRIC CARS DUE TO THE IMPROVED FIELD WEIGHTENING SYSTEM OF TRACTION ELECTRIC MOTORS

Abstract

One of the main tasks of the Russian Railways is the delivery of transit goods between Europe and Asia as quickly as possible and at a high quality level. In this regard, the relevance of the question of increasing the speed of trains arises. At present, on the domestic electric rolling stock of alternating current, the increase in speed is provided by regulating the voltage of the rectifier-inverter converter and the magnetic flux of the traction motor. The magnetic flux is regulated by changing the excitation current compared to the armature current due to the traction motor field weakening system, which is connected in parallel with the excitation winding. The article presents the disadvantages of a typical system for weakening the field of traction electric motors of an electric locomotive. In connection with the development of power electronics, it became possible to improve a typical field weakening system by using fully controllable semiconductor devices in it, which will eliminate the disadvantages of a typical system. To test the proposed technical solution, a model of a typical and improved systems for weakening the field of traction motors was developed and tested on a laboratory bench. In the course of laboratory tests, electromagnetic processes were obtained during operation of a traction motor with a typical and proposed field weakening systems. The research results are presented in this article.