COMPEL - The international journal for computation and mathematics in electrical and electronic engineering: Volume 18 Issue 4

The charge‐tube method for space‐charge simulations

F.H. Read, A. Chalupka, N.J. Bowring

The charge‐tube method is an accurate way of assigning the space‐charge of a beam in computational simulations of charged particle systems. The method is described and is compared…

Quantum interface conditions for quasi‐Fermi levels in an abrupt heterojunction

Abderrazzak El Boukili

We present a semi‐quantum model including tunneling effects across an abrupt heterojunction. The discontinuity of the effective masses and the energy bands are considered. The…

Fast analytical model of induction motor for approaching rotor eccentricity

Dariusz Spalek

Deals with the problem of the electromagnetic torque calculation in the case of either nonuniformity of the air‐gap or eccentricity of the rotor. The electromagnetic field…

Voltage ranking using artificial neural network

K.L. Lo, W.P. Luan, M. Given, J.F. Macqueen, A.O. Ekwue, A.M. Chebbo

Voltage ranking attempts to rank busbar voltage deviations from their normally accepted security margins based on a set of performance indices (PI), without performing a full load…

Models of magnetic circuits and their equivalent electrical diagrams

Jan Deskur

The paper presents a method of creating electrical equivalent diagrams of magnetic circuits. The method is based on bond‐graph techniques, using flux derivative as flow variable…

Dynamic operation of an electromagnetic actuator taking nonlinearity and eddy currents into account

Lech Nowak

The paper deals with a coupled field‐circuit simulation of transient and dynamic states in a non‐linear axisymmetrical electromagnetic device. The mathematical model of the…

Finite element analysis of electromagnetic torque saturation harmonics in a squirrel cage machine

Andrzej Demenko

The electromagnetic torque oscillations caused by saturation harmonics in a squirrel cage machine are analysed. Special attention is paid to the most important saturation harmonic…

Optimizing ferromagnetic characteristics to reduce Newton iterations

Uwe Pahner, Ronnie Belmans, Kay Hameyer

The standard Newton iteration scheme to solve a non‐linear system of equations obtained from the finite element methods is based on the updating of the field dependent element…

Selected projection methods to improve the convergence of non‐linear problems

Ronny Mertens, Uwe Pahner, Ronnie Belmans, Kay Hameyer

Short computation times required for the design and numerical optimisation of electromagnetic devices with the finite element method are obtained using an adaptive mesh refinement…

Investigations of the audible noise of inductors with respect to different ferromagnetic materials

Gerd Terörde, Jürgen Schneider, Kay Hameyer

Fluorescent lamps are one of the most modern light sources. They can be connected to the 230Vac supply without a transformer. To operate them, an inductor and starter are required…

Complementary finite element magnetodynamic formulations with enforced magnetic fluxes

P. Dular, J. Gyselinck, F. Henrotte, W. Legros, J. Melkebeek

Two complementary 3D finite element formulations, with either the magnetic field or the magnetic vector potential as unknowns, are developed to deal with the modeling of eddy…

Contribution to the finite element analysis of eddy‐currents in multi‐conductor windings surrounded by magnetically non‐linear media

Áron Szucs, Antero Arkkio, Tapani Jokinen

In the finite element analysis of electrical machines the multi‐conductor winding in a stator slot is usually modeled simply by a single conductor with constant current density…

Fuzzy control of current in thyristor DC drive

Krzysztof Zawirski, Konrad Urbański, Jacek Ferenc

In the paper an application of fuzzy logic controller (FLC) for control of thyristor DC drive is presented. During synthesis of the FLC a robustness against variation of structure…