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FEM Based Investigation of the Impact of the Wire Termination on the Current Distribution and the Eddy Current Losses in Litz Wire
In this project you will model the 3D geometry of litz wire by a mathematical algorithm. Furthermore, the current density distribution and the eddy current losses should be calculated for different termination strategies and for different litz wire geometries by FEM. The impact of improper terminations should be qualitatively/quantitatively analysed.
Keywords: Litz wire, Termination, FEM Simulation
Due to a high efficiency and a high power density, isolated DC-DC converters
are widely used in power supplies of modern data centers, battery
chargers of electric vehicles, etc. A key component of such isolated DC-DC
converters is the medium frequency transformer (MFT), in which often litz
wire is used to reduce the losses. Litz wire is made of numerous twisted
strands to prevent the bundle-level eddy current. However, the termination
of the litz wires has a significant impact on the current distribution
between strands, and could result in high eddy current losses. Therefore,
the impact of the wire termination on the current density distribution and
the eddy current losses in litz wire must be investigated.
In this project, 3D FEM is used to investigate the effects. Your task
is to model the 3D geometry of litz wire by a mathematical algorithm.
Furthermore, the current density distribution and the eddy current losses
should be calculated for different termination strategies and for different
litz wire geometries by FEM. The impact of improper terminations should
be qualitatively/quantitatively analysed.
Due to a high efficiency and a high power density, isolated DC-DC converters are widely used in power supplies of modern data centers, battery chargers of electric vehicles, etc. A key component of such isolated DC-DC converters is the medium frequency transformer (MFT), in which often litz wire is used to reduce the losses. Litz wire is made of numerous twisted strands to prevent the bundle-level eddy current. However, the termination of the litz wires has a significant impact on the current distribution between strands, and could result in high eddy current losses. Therefore, the impact of the wire termination on the current density distribution and the eddy current losses in litz wire must be investigated. In this project, 3D FEM is used to investigate the effects. Your task is to model the 3D geometry of litz wire by a mathematical algorithm. Furthermore, the current density distribution and the eddy current losses should be calculated for different termination strategies and for different litz wire geometries by FEM. The impact of improper terminations should be qualitatively/quantitatively analysed.
Qingchao Meng, ETL F17, meng@hpe.ee.ethz.ch
Qingchao Meng, ETL F17, meng@hpe.ee.ethz.ch
20% Coding
60% Simulation
20% Theory
20% Coding 60% Simulation 20% Theory
Interests in FEM simulation and modeling, Interests in power electronics, Working language: English/German
Interests in FEM simulation and modeling, Interests in power electronics, Working language: English/German