Impact of manufacturing proces on optimal shape of induction machine slots

This article deals with optimization of slots of an induction machine with a genetic algorithm. The considered machine is a small induction machine with output power of 600 W. Properties of sheets of the considered machine could be strongly influenced by cutting because of their small size. The main aim of this article is to show how optimal shape of slots (in terms of efficiency) is influenced by manufacturing process. To study this, three finite elements models of the machine are used for computing within genetic algorithm run. First one is simple model without any consideration of manufacturing process. The second model is shaped exactly according to drawings from manufacturer (the real shape is not circular) and there are also rivets in stator modeled in this model. The third model additionally contains areas with different material properties along cutting edges which simulate impact of cutting on materials properties.