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Determination of temperature field distribution and rate of heat transfer by means of thermal-electrical analogy in DC machine

In this paper is presented an analysis method of electrical circuits, more exactly nodal method, in order to compute the temperature field distribution necessary to the heating and ventilation systems of electrical machine. As analysis method, the modified nodal method was used which does not impose any restriction at the circuit structure, being a prevalence of the nodal method. For this reason, this method was used in the analysis programme of circuits called SPICE. In the software application called NAPACI, authors analyses the temperature field distribution and the rate of heat transfer which are necessary for a complete study to range of the temperature in steady state. This analysis supposes the knowledge and the localization of temperature losses values, determination of the rate values of heat transfer and their distribution in different sides of electrical machine. Comparing the results obtained by means of other two programmes NAPACI and SPICE, it can be observed that these results are identical.