Abstract:

This paper discusses the method for the solution of 3-D temperature distribution in a cycling oil cooled aircraft AC synchronous generator. The basic discretization principle and calculation of the element thermal conductance in network topology method are studied. The methods of forming the- thermal conductances matrix and treating the boundary conditions are given.Also analyzed are the convection cooled electrical machine. To reduce the computing time.the stator part and rotor part are considered separately, then the thermal exchange between them is taken into account. In the end of this paper, the 3-D temperature distribution for a certain cycling oil cooled aircraft AC generator is given including the 2-D temperature distribution curves of the hottest parts in the stator and rotor correspondingly. The temperature distribution of the rotor windings in the radial direction is also presented.

Key words: oil cooled generator, brushless electric machiness tempe-rature distributions heat transfer