2D Finite Element (FE) modeling and simulation of the stator winding of synchronous machines in adjustable degree of detailing
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The General Purpose 2D Electromagnetic Tool, GP2DET, at Voith Siemens Hydro Power Generation GmbH is a tool developed for simulation and calculation of electrical parameters in large hydro power machines. In this tool, the stator windings have been modelled as massive conductor blocks, and current has been impressed on these conductors as current density for load situations. The scope for the work in this thesis has been to implement an automated procedure for a detailed modelling of the stator windings, testing of the procedure and analyses of losses from eddy currents and circulating currents. A group of macros was written in ANSYS APDL for the reworking of existing simulation models. The macros automatically rework models created in GP2DET, and replaces massive stator conductors with detailed stranded conductors. 17 alternatives for which conductors that shall be replaced were implemented. Bar- and coil windings are supported, and bar windings can be modelled with Roebel-transposition. Some detailing alternatives allow replacement of coils or coil groups. For these alternatives, automatic connection of each strand in the stranded coil sides is carried out. All strands are connected uniquely within a coil, and can be connected blockwise between coils and coil groups if desired. Transposition is available within a coil, between coils, and between coil groups. One type of transposition was implemented. The 17 detailing alternatives were tested on three different machines; two with bar windings and one with coil windings. For these machines the procedure executed faultlessly.