Badanie wpływu rozwiązań konstrukcyjnych na efektywność chłodzenia silnika elektrycznego

Celem niniejszej pracy jest analiza efektywności chłodzenia silnika elektrycznego w zależności od zastosowanego wariantu konstrukcyjnego. Obliczenia przepływu powietrza przez silnik zostały przeprowadzone dla różnych rozwiązań konstrukcyjnych a uzyskane wyniki mogą być przydatne zarówno w diagnostyce silników elektrycznych jak i projektowaniu układów chłodzących.

The purpose of this paper is to analyse the cooling efficiency of an electric motor depending on the design solution made with use of Autodesk Simulation CFD 2012 computing system. For all analyses the same conditions were assumed: losses in the device 250W, the ambient temperature 20°C, the operating time at full load 40 minutes. Fig. 1 in Section 2 presents the simplified object modeled for the analysis. Simulations for two types of fan (see Fig. 2) were performed for this design solution. Section 3 presents sample analysis results (Figs. 3 and 4) and comparison of the minimum and maximum temperature on the body for I and II type of the fan (Fig. 5). A new design with a modified casing is proposed and shown in Fig. 6. The analytical results for this solution are presented in Figs. 7 and 8. The chart in Fig. 9 shows the comparison of the temperature distribution along the electric motor body before and after the change of casing. The results of analyses show that more efficient is the axial fan (type II), however, the biggest temperature drop is obtained by extension and change of the body casing shape. The numerical simulations also helped to identify areas of operation temperatures which could have a destructive effect on the bearings, permanent magnets and other components as well as the efficiency of the device [1, 4].