| Abstract |
In modern automotive drive applications, ElectricallyExcited Synchronous Machines (ESM) have become analternative to PSMs. Until now, ESMs need slip-rings to supplythe rotor winding. However, carbon brush slip-ring systems aresensitive to environmental influences and produce conductive carbondust during operation. This paper discusses thecreation and utilisation of a semi-analytical loss model for the designof rotary transformes with air-gaps for contactless energy transfer systemsto replace slip-ring systems in electrical machines.The model allows fast and easy loss calculation for topologies like theseries-resonant-converter.It is validated by FEM for three basic core-shapes of rotary transformers.Once a parameter set is determined by FEM for a transformer design, analyticalscaling laws allow fast loss calculation of the copper-losses for arbitrary frequenciesand temperatures. |
