Analysis of the Heat State of the Hydrogenerator of the Combined Excitation, Intended for the Development of the Energy of Small and Medium Rivers

The development of energy in small and medium rivers is an urgent task, since the total energy potential of this resource is many times higher than this indicator for large rivers. The article considers a hydrogenerator of a unique design. It is completely submerged in water, which allows not to violate the ecology and aesthetics of the environment. To ensure waterproofing, the generator is filled with oil. It is based on an electric machine of combined excitation, for which there is a patent of the Russian Federation. For the design of hydrogenerators of this type, a design system has been developed, which includes the synthesis of optimal geometry and electromagnetic and thermal analysis of the calculated design. The article presents the final stage of the analysis - this is the assessment of the steady state thermal state of the generator at rated load. Thermal calculations were carried out in two stages. At the first stage, the assessment was carried out on the basis of the method of thermal equivalent circuits, at the second stage, the assessment was carried out using the finite element method. The article presents the results of the analysis for a hydrogenerator 3 kW 350 rpm