Russian Federation
Purpose: to prevent faults in the windings of locomotive traction electric motors (TEMs), it is necessary to study the processes of thermomechanical aging of the insulation, as well as the initial signs of damage to the insulation material of the windings. In this article, the accelerated aging of the insulation is studied on segmented windings and core scans. Methods: a step-by-step test methodology was proposed for conducting experiments. In the first stage, preliminary studies were conducted to assess the performance and accuracy of the measuring equipment, calibrate the measurement circuits, and test the software of the information collection, transmission, processing, and display system. In the second stage, experiments were performed on laboratory models, which were specially designed prototypes. The third stage involved operational tests on the mutual load bench in the TED overhaul workshop. Results: in the course of research calculated the radial deformation of the stator tooth, the circumferential deformation in the stator core yoke, and the axial deformation on the rear wall of the stator during heating by 100 °C. The data obtained can be used to improve the accuracy of thermal calculations for AC electric machines. Practical significance: to ensure the reliability of the TED operation, it is extremely important to consider the heat flows when drawing up the train movement mode maps and conducting traction calculations. Failure to comply with this requirement can lead to overheating of the TED, which in turn significantly reduces their service life and can cause accidents.
traction electric motors, insulation, reliability of electric machines, diagnostics of traction electric motors, thermomechanical aging of insulation
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