Electromagnetic Devices with Moving Parts—Simulation with FEM/BEM Coupling

Thomas Rüberg, Lars Kielhorn and Jürgen Zechner
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Thomas Rüberg: TAILSIT GmbH, Nikolaiplatz 4, 8020 Graz, Austria
Lars Kielhorn: TAILSIT GmbH, Nikolaiplatz 4, 8020 Graz, Austria
Jürgen Zechner: TAILSIT GmbH, Nikolaiplatz 4, 8020 Graz, Austria

Mathematics, 2021, vol. 9, issue 15, 1-18

Abstract: The numerical analysis of electromagnetic devices by means of finite element methods (FEM) is often hindered by the need to incorporate the surrounding domain. The discretisation of the air may become complex and has to be truncated by artificial boundaries incurring a modelling error. Even more problematic are moving parts that require tedious re-meshing and mapping techniques. In this work, we tackle these problems by using the boundary element method (BEM) in conjunction with FEM. Whereas the solid parts of the electrical device are discretised by FEM, which can easily account for material non-linearities, the surrounding domain is represented by BEM, which requires only a surface discretisation. This approach completely avoids an air mesh and its re-meshing during the simulation with moving or deforming parts. Our approach is robust, shows optimal complexity, and provides an accurate calculation of electromagnetic forces that are required to study the mechanical behaviour of the device.

Keywords: multiphysics; force computation; fast multipole method; multiply connected domains (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2021
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