scholarly journals Spectral Element Method Modeling of Eddy Current Losses in High-Frequency Transformers

2019 ◽  
Vol 24 (1) ◽  
pp. 28 ◽  
Author(s):  
Koen Bastiaens ◽  
Mitrofan Curti ◽  
Dave Krop ◽  
Sultan Jumayev ◽  
Elena Lomonova
Keyword(s):  
Eddy Current ◽  
High Frequency ◽  
Spectral Element Method ◽  
Spectral Element ◽  
High Ratio ◽  
Two Dimensional ◽  
Eddy Current Losses ◽  
High Frequency Transformer ◽  
Benchmark System ◽  
Element Method

This paper concerns the modeling of eddy current losses in conductive materials in the vicinity of a high-frequency transformer; more specifically, in two-dimensional problems where a high ratio between the object dimensions and the skin-depth exists. The analysis is performed using the Spectral Element Method (SEM), where high order Legendre–Gauss–Lobatto polynomials are applied to increase the accuracy of the results with respect to the Finite Element Method (FEM). A convergence analysis is performed on a two-dimensional benchmark system, for both the SEM and FEM. The benchmark system consists of a high-frequency transformer confined by a conductive cylinder and is free of complex geometrical shapes. Two different objectives are investigated. First, the discretizations at which the relative error with respect to a reference solution is minimized are compared. Second, the discretizations at which the trade-off between computational effort and accuracy is optimized are compared. The results indicated that by applying the SEM to the two-dimensional benchmark system, a higher accuracy per degree of freedom and significantly lower computation time are obtained with respect to the FEM. Therefore, the SEM is proven to be particularly useful for this type of problem.

Computation of high‐frequency TM eddy‐current losses in magnetic materials

1985 ◽  
Vol 57 (8) ◽  
pp. 3863-3865 ◽  
Author(s):  
T. H. Fawzi ◽  
M. T. Ahmed ◽  
P. E. Burke
Keyword(s):  
Magnetic Materials ◽  
Eddy Current ◽  
High Frequency ◽  
Eddy Current Losses

Calculating the main and leakage inductance matrix of the 3-column 15-winding autotransformer

2011 ◽  
Vol 60 (3) ◽  
pp. 215-222
Author(s):  
Damian Mazur ◽  
Marek Gołębiowski
Keyword(s):  
Finite Elements ◽  
Eddy Current ◽  
3D Models ◽  
Finite Elements Method ◽  
Calculation Methods ◽  
Eddy Current Losses ◽  
Voltage Supply ◽  
Leakage Inductance ◽  
2D And 3D

Calculating the main and leakage inductance matrix of the 3-column 15-winding autotransformer The aim of this paper is presentation and comparison of calculation methods of the inductance matrix of a 3-column multi-winding autotransformer. Main and leakage autotransformer inductance was obtained using finite elements method. Static calculations were made at the current supply for 2D and 3D models, and mono-harmonic calculations were made at the voltage supply. In the mono-harmonic calculations the eddy current losses were taken into account, this made it possible to study relationship between the autotransformer parameters and the frequency. Calculations were made using Ansys and the authors' own programs in Matlab.

scholarly journals Permanent-Magnet Eddy-Current Losses: A Global Revision of Calculation and Analysis

2019 ◽  
Vol 24 (3) ◽  
pp. 67 ◽  
Author(s):  
Daoud Ouamara ◽  
Frédéric Dubas
Keyword(s):  
Permanent Magnet ◽  
Eddy Current ◽  
Eddy Currents ◽  
Research Field ◽  
Electrical Machines ◽  
Important Research ◽  
Calculation Methods ◽  
Current Analysis ◽  
Eddy Current Losses ◽  
Reduction Techniques

Eddy-current analysis is an important research field. This phenomenon occurs in multiple areas and has several applications: electromagnetic braking, repulsive effects, levitation, etc. Thereby, this paper is limited to eddy-current study in rotating electrical machines. In the design process, if the permanent-magnet (PM) loss calculation is very important, the overheating due to eddy-currents must be taken into account. The content of this paper includes sources, calculation methods, reduction techniques, and thermal analysis of PM eddy-current losses. This review aims to act as a guide for the reader to learn about the different aspects and points to consider in studying the eddy-current.

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