COMPEL - The international journal for computation and mathematics in electrical and electronic engineering: Volume 30 Issue 6

Eddy current losses of segmented Nd‐Fe‐B sintered magnets without insulation under various conditions

Norio Takahashi, Hirofumi Shinagawa, Daisuke Miyagi, Yuhito Doi

The purpose of this paper is to examine the mechanism of the increase or decrease of eddy current loss of the segmented Nd‐Fe‐B sintered magnets without insulation, and the…

Convergence acceleration in the polarization method for nonlinear periodic fields

Ioan R. Ciric, Florea I. Hantila, Mihai Maricaru

The purpose of this paper is to present three novel techniques aimed at increasing the efficiency of the polarization fixed point method for the solution of nonlinear periodic…

Decomposition and regularization of nonlinear anisotropic curl‐curl DAEs

Markus Clemens, Sebastian Scho¨ps, Herbert De Gersem, Andreas Bartel

The space discretization of eddy‐current problems in the magnetic vector potential formulation leads to a system of differential‐algebraic equations. They are typically time…

Algebraic structures underneath geometric approaches

Jari Kangas, Saku Suuriniemi, Lauri Kettunen

The purpose of this paper is to study algebraic structures that underlie the geometric approaches. The structures and their properties are analyzed to address how to…

Measurements and simulations of the heat transfer on end windings of an induction machine

Martin Hettegger, Bernhard Streibl, Oszkár Bíró, Harald Neudorfer

For an accurate simulation of the temperature distribution inside an electrical machine a method for deriving the convective heat transfer coefficient numerically would be…

Computation of the noise radiation of an induction machine using 3D FEM/BEM

Bernhard Weilharter, Oszkár Bíró, Hermann Lang, Siegfried Rainer

The purpose of this paper is to set up a comprehensive numerical approach to estimate the 3D structural vibration and noise radiation of an induction machine.

Acceleration of moment method using CUDA

Imre Kiss, József Pávó, Szabolcs Gyimóthy

The purpose of this paper is to accelerate the time‐consuming task of assembling the impedance matrix resulting from the discretization of integral equations by the moment method…

Meshless local Petrov‐Galerkin (MLPG) methods in quantum mechanics

Williams L. Nicomedes, Renato C. Mesquita, Fernando J.S. Moreira

The purpose of this paper is to solve both eigenvalue and boundary value problems coming from the field of quantum mechanics through the application of meshless methods…

Regularized inversion of a distributed point source model for the reconstruction of defects in eddy current imaging

S. Bausson, V. Thomas, P.‐Y. Joubert, L. Blanc‐Féraud, J. Darbon, G. Aubert

The inverse problem in the eddy current (EC) imaging of metallic parts is an ill‐posed problem. The purpose of the paper is to compare the performances of regularized algorithms…

Multi‐domain topology optimization with ant colony systems

Lucas S. Batista, Felipe Campelo, Frederico G. Guimarães, Jaime A. Ramírez

The purpose of this paper is to present a graph representation of the design space that is suitable for the ant colony optimization (ACO) method in topology optimization (TO…

Virtual power principle and Maxwell's tensor: which comes first?

Alain Bossavit

The purpose of this paper is to clarify the status of Maxwell's tensor with respect to the virtual power principle (VPP).

A hybrid multiobjective differential evolution method for electromagnetic device optimization

Piergiorgio Alotto

The purpose of this paper is to show that the performance of differential evolution (DE) can be substantially improved by a combination of techniques. These enhancements are…

A robust objective function for topology optimization

Min Li, David A. Lowther

Robust design is very important for manufacturers to ensure the quality of the finished product. Therefore, a robustness measure is needed for the topological design of…

Accelerated Markov chain Monte Carlo sampling in electrical capacitance tomography

Daniel Watzenig, Markus Neumayer, Colin Fox

The purpose of this paper is to establish a cheap but accurate approximation of the forward map in electrical capacitance tomography in order to approach robust real‐time…

Adaptive strategies for fast frequency sweeps

Yves Konkel, Ortwin Farle, Andreas Köhler, Alwin Schultschik, Romanus Dyczij‐Edlinger

The purpose of this paper is to compare competing adaptive strategies for fast frequency sweeps for driven and waveguide‐mode problems and give recommendations for practical…

Nonlinear magnetostatic BEM formulation using one unknown double layer charge

Kazuhisa Ishibashi, Zoran Andjelic

The purpose of this paper is to solve generic magnetostatic problems by BEM, by studying how to use a boundary integral equation (BIE) with the double layer charge as unknown…

Electromechanical analysis of end windings in turbo generators

Raffaele Albanese, Flavio Calvano, Giorgio DalMut, Fabrizio Ferraioli, Alessandro Formisano, Fabrizio Marignetti, Raffaele Martone, Guglielmo Rubinacci, Antonelle Tamburrino, Salvatore Ventre

The purpose of this paper is to present a numerical approach for the computation of 3D magnetic fields in rotating electrical machines. The technique is suitable for the…

Finite element analysis of electrical machines and transformers: State of the art and future trends

Erich Schmidt

The purpose of this paper is to discuss the state of the art of finite element analysis of electrical machines and transformers. Electrical machines and transformers are prime…

Fast computation of R, L parameters of high frequency multi‐winding magnetic components

Z. De Grève, O. Deblecker, J. Lobry

The purpose of this paper is to propose a numerical procedure for the extraction of RL equivalent circuits of high frequency multi‐winding transformers with a low computational…

Hidden metallic object localization by using giant magnetic resistor sensors

Werner Renhart, Mario Bellina, Christian Magele, Alice Köstinger

The purpose of this paper is to achieve a very accurate localization of hidden metallic objects in human medicine applications.

Stress zone imaging in steel plates of electrical machines

Markus Neumayer, Daniel Watzenig, Bernhard Brandstätter

The purpose of this paper is to demonstrate an inverse problem approach for the determination of stress zones in steel plates of electrical machines. Steel plates of electrical…

Guest editorial

Oszkar Biro