Numerical computation of temperature field distribution in a DC machine

In order to design correctly an electrical machine it is necessary that the machine cooling to be efficient and to know the values and the temperature distnbution in this (in the rotor) To determine the temperature distribution, a thermal equivalent circuit is used for the heat transfer of machine. The thermal equivalent circuit is analogous to electric circuit, in which heat is generated by "current sources-, temperature being in analogy with voltage 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 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 localization of the temperature losses values, determination of the rate values of heat transfer and their distribution in different sides of electrical machine