GENERAL APPROACHES TO THE CREATION OF THERMAL MODELS OF ELECTRIC TRANSPORTATION TRACTION ENGINES

The article considers promising methods for analyzing the thermal state of traction motors used on rolling stock of electric transport. It is determined that the method of equivalent thermal substitution schemes is a promising method of thermal state analysis. It is substantiated that regardless of the number of elements, even if it is equal to infinity, the system remains linear during the transition from concentrated constant to distributed parameters. Processes in it are described by linear differential equations, and you can use the method of superimposing heat flows. In the established regime, this is expressed in the equality of the total excess of body temperature to the sum of partial temperature excesses from losses in its various parts. It is proved that during the transient process, the real heating curve of the engine element is built by summing up partial heating curves caused by energy losses in each individual element in the absence of losses in other elements. When studying the transition process, it is necessary to take into account the speed of heat propagation in the material and the geometric dimensions of traction motors. These tasks are solved on the basis of formulated provisions. General approaches to the creation of a base of elements of substitution schemes are proposed, which allow to unify the development of the thermal model of the engine regardless of its design features.