Low-loss FeSi Sheet for Energy-efficient Electrical Drives
DFG-Research Group
Efficiency and power density of electrical drives are a direct result of the materials used, predominantly the magnetic properties of the non-grain oriented electrical steel, which is cut and stacked to build the magnetic core of electric machines. In order to minimize losses, it is necessary to understand the material characteristics. Complex interdependencies between the material structure and the resulting magnetic properties along the entire production chain affect the electrical steel laminations. In this project, the evolution of texture, microstructure and processing induced residual stress is studied along an experimental processing route together with five institutes in Aachen, Freiberg and Munich. The correlation and quantification of influencing parameters as well as a coupled simulation of the property evolution along the process chain are targets of this research project. The findings of the research and developed models are used, to define the requirements on electrical steel from the electric machine. This information is used to optimize production parameters in order to produce application specific electrical steel laminations. This enables a consideration of the full material potential in the design stage of an electric machine and adaption of production strategies. This interdisciplinary DFG research group works on this challenging task.