In electrical machine R&D, like in other fields,
different computation methods are needed for different
purposes. For detailed analysis and product design, a
multi-physical finite element (FEM) analysis is required.
However, if advanced multi-objective optimisation of
electromechanical devices is pursued, the computational
burden of FEM analysis is too high, and more simple
analytical models are needed. In this study, both
alternatives are discussed.
One hot topic in FEM computations has lately been the
utilisation of open-source FEM tools. The benefits of
open source can be found e.g. in massive parallel
computation, more vast scripting possibilities, and
possibility to tailor the software for special usage.
Here, we study open-source FEM tools for
three-dimensional (3D) electromagnetic and multi-physical
simulation of electrical machines. The two most promising
tools are Elmer and GetDP. We present two electrical
machine test cases with Elmer. Elmer and GetDP are
presently only opensource tools, which can solve 3D
electromagnetic problems. However, they lack features
needed for rotating electrical machine computations, e.g.
they have limitations with the rotation model. The
limitations are more severe in GetDP. The parallel
performance of Elmer exceeds the results of GetDP, as
GetDP utilises parallel computation only in linear
solvers, whereas Elmer also in linear system assembly.
Furthermore, in the test cases, Elmer shows a good
parallel performance with rotating electrical machine
models. Additionally, optimisation of electrical machines
was studied. An analytical model implemented in MATLAB
was used to represent an electrical machine in the
optimisation process. Both single and multi-objective
algorithms were tested in DAKOTA optimisation tool.
|Series||VTT Research Report|
- electrical machines