Computational Electromagnetics

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The workgroup deals both with the numerical simulation as well as with the soft- and hard-magnetic materials, which are used in electrical machines and transformers. Within the numerical simulation, all areas of interest that are necessary in relation with the design, construction and optimization of electromagnetic energy conversion are considered. Apart from electromagnetics, structural dynamics and acoustics, as well as the thermal behavior of the energy converters, the focus of the investigations is in particular the combination of different domains in the form of multi-physical system simulations.

Within the framework of system simulation, a time-transient system model of the drive train was developed, which, in addition to the electrical machine, also considers power electronics, control, sensor technology and mechanics.
In addition to saturation effects, stator and rotor slotting as well as the temperature, the modeling of the machine also takes into account manufacturing influences.

The IEM can rely on a well-founded experience in the development of its own calculation tools. For example, iMOOSE provides a software library based on the method of finite elements for numerical field computation. By working closely with the other working groups, the development of flexible simulation tools and sophisticated models is one of the core competencies.

The prerequisite for carrying out electromagnetic simulations is the appropriate characterization and modeling of the soft- and hard-magnetic materials used.
Hysteresis models are developed, as well as location- and frequency-dependent permeabilities. Furthermore, material deterioration by manufacturing is considered for simulation and loss calculation. With regard to magnets, its magnetization behavior is modeled and temperature stability is investigated.