COMPEL - The international journal for computation and mathematics in electrical and electronic engineering: Volume 34 Issue 5

A deterministic multiobjective optimizer

To the purpose of this paper is to show the main features of the Direct Multisearch method and how it can be enhanced and hybridized without compromising its mathematical…

Optimizing power converter PCB design for lower EMI

The purpose of this paper is to develop a novel technique for the pre-design of a printed circuit board (PCB) of a DC-DC power converters where the placement of electric…

Artefact reduction in fast Bayesian inversion in electrical tomography

The purpose of this paper is to reduce the artifacts in fast Bayesian reconstruction images in electrical tomography. This is in particular important with respect to object…

Multi-physics optimisation of energy harvesters

– The purpose of this paper is to describe an electro-mechanical lumped parameters model used for the simulation of an energy harvester device.

A full structural mechanical description of beam elements for rotors in electrical machines

The purpose of this paper is to get a more consistent finite element description for three-dimensional (3D) Timoshenko beam elements. It extends the common description of beam…

Litz wire homogenization by finite elements and model-order reduction

– The purpose of this paper is to determine the broadband frequency response of the impedance matrix of wireless power transfer (WPT) systems comprising litz wire coils.

Parallelized ICCG method using block-multicolor orderings in real symmetric linear system derived from voltage-driven FEM in time domain

The purpose of this paper is to improve the performance of block-multicolor (BMC) ordering for the parallelized incomplete-Cholesky-preconditioned conjugate gradient (ICCG…

High-frequency modelling of coils by integral formulations

The purpose of this paper is to discuss a numerically efficient simulation method for the study of the high-frequency behaviour of air-cored coils. The self-resonance phenomenon…

Effects of inverter supply on the iron loss characteristics of doubly fed induction machines

The purpose of this paper is to study the effects of inverter supply on the iron loss characteristics of slip-ring induction machines. Pulse width modulated (PWM) voltage supply…

Analytical model for magnetic anisotropy of non-oriented steel sheets

Recent investigations on magnetic properties of non-oriented (NO) steel sheets enhance the comprehension of the magnetic anisotropy behaviour of widely employed electrical sheets…

Determination of the temperature increase in the human eye due to electromagnetic fields

The purpose of this paper is to present a numerical analysis of the specific absorption rate (SAR) and temperature increase in a three dimensional (3D) anatomical human eye model…

Estimation of additional losses due to random contacts at the edges of stator of an electrical machine

Punching of the electrical sheets impair the insulation and make random galvanic contacts between the edges of the sheets. The purpose of this paper is to model the random…

Equivalent current models for magnets characterization

The purpose of this paper is to analyze the impact of different current representation models in the high field magnets characterization. Inverse source methodology used for…

Characterizing the convective heat transfer on stator ventilation ducts for large hydro generators with a neural network

The purpose of this paper is to approximate the convective heat transfer using a few non-dimensional parameters in the design process of large synchronous machines. The computed…

Fast nonlinear finite element analysis using Newton-Raphson method implemented by Krylov subspace method with relaxed convergence criterion

– The purpose of this paper is the realization of Fast nonlinear finite element analysis (FEA).

Correction of homogenized lamination stacks via a subproblem finite element method

The purpose of this paper is to develop a subproblem finite element method for progressive modeling of lamination stacks in magnetic cores, from homogenized solutions up to…

Accelerated unconditionally stable FDTD scheme with modified operators

The locally one-dimensional (LOD) finite-difference time-domain (FDTD) method features unconditional stability, yet its low accuracy in time can potentially become detrimental…

Surrogate parameter identification for coupled lithium-ion cell models

The need to optimize and simulate lithium-ion cells is of high importance to their durability. It is possible to use semi-empirical models based on equivalent circuits to model…

Validation of a heat transfer model for end winding bars of large hydro generators

The purpose of this paper is to carry out an analytical approximation model (heat transfer model (HTM)) for the calculation of the heat transfer coefficient at the end winding…

Multi-scale FEM and magnetic vector potential A for 3D eddy currents in laminated media

– The purpose of this paper is an accurate computation of eddy currents in laminated media with minimal computer resources.

Stability analysis of space-time finite integration schemes

The purpose of this paper is to examine the numerical stability of a space-time finite integration (FI) method. A symmetric correction is proposed to give an accurate constitutive…

Model order reduction for moving objects: fast simulation of vibration energy harvesters

The finite element method (FEM) for 3D models needs heavy computational cost. The computational cost for FE analysis of moving objects, e.g. Vibration energy harvester, must be…

A curvilinear stochastic-FDTD algorithm for 3-D EMC problems with media uncertainties

Stochastic uncertainties in material parameters have a significant impact on the analysis of real-world electromagnetic compatibility (EMC) problems. Conventional approaches via…

Preface