Magnetic Material Modeling for Numerical Simulation of Electrical Machines
The development of energy efficient electrical machines requires accurate knowledge of the magnetic material behavior, i.e., iron loss components and magnetizability, already in the design stage. In addition, knowledge on the magnetic property deterioration due to induced residual stresses occurring during the manufacturing as well as due to applied mechanical stresses during the operation of the electrical machine is indispensable for the contemporary machine-design.
In general, the modeling can be approached at different length scales, i.e., from quantum mechanics at the atomic level and micromagnetics at the sub-micrometer length scale to continuum modeling at the ultra-millimeter scale. The difficulty to apply micromagnetic approaches in the numerical simulation of electrical machines is given both, by the tremendous need of computational effort as well as the difficulty to consider the interaction with effects present at the macroscale such as, e.g., residual stresses or non-local eddy currents.
A more modern view of such aspects is to regard materials as multilevel structures, where structural features at all length scales play a significant role. Multiscale modeling is the field of solving such problems that have important features at multiple spatial and/or temporal scales. It allows calculating material properties on one level using information or models from other levels. In the light of this, this presentation will give an overview on the current modeling approaches applied at the Institute of Electrical Machines (IEM) for soft magnetic materials in the simulation of rotating electrical machines. Particular attention will be paid to the effect of residual as well as applied mechanical stress on the magnetic behavior occurring at the various steps of machine manufacturing and during machine operation.
Dr.-Ing. habil. Dr. h. c. Kay Hameyer
Institut für Elektrische Maschinen (IEM)
Lehrstuhl für Elektromagnetische Energiewandlung
Schinkelstraße 4
D-52062 Aachen
Germany
| Phone | +49 241 80 97667 |
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