Thermal modeling of a stator bar - Influence of geometry and material properties

This paper aims to show the impact of different materials used for the consolidated green stator bar on the thermal cycling performance using Thermal Finite Element Method simulations. The importance of considering the complete geometry of the conductors and all the consolidating materials is debated. In this work, different 2D geometries representing a fully insulated stator bar are considered for the simulation of the temperature distribution during thermal cycling. Particular attention will be given to the thermal resistance of the internal semiconducting transposition filler, that of the stack separator as well as to those of the Roebel crossing insulation and strand insulation. 2D complex geometries are compared with simplified ones, in order to determine the possibility of using simplified geometries for simulation.