COMPEL - The international journal for computation and mathematics in electrical and electronic engineering: Volume 14 Issue 4
Table of contents
ELECTROMAGNETIC ASPECTS OF ELECTRICAL MACHINES
A. KostThe development of electrical machines is nowadays closely related to the knowledge of the electromagnetic fields throughout the different parts of a machine. Although a machine…
ON THE HOMOGENIZATION OF MAXWELL EQUATIONS
A. BossavitWe discuss the following general problem: given a composite, made from at least two different materials with each its own (scalar, and possibly complex‐valued) ε and μ…
ADAPTIVE REFINEMENT AND OPTIMIZATION OF FIRST ORDER TETRAHEDRAL MESHES FOR ELECTRODYNAMICS
K.M. GawrylczykThe geometric properties of finite element mesh are of great importance. The refinement algorithm leads often to very irregular elements. The problem of optimization of 3D‐meshes…
3D EDDY CURRENTS MODELLING BY USING A PARTICULAR TWO COMPONENT TECHNIQUE
A.G. Kladas, J.A. TegopoulosSeveral formulations have been developed solving 3D eddy current problems by the Finite element method based on vector quantities. Scalars, involving only one unknown per node of…
CALCULATION OF ELECTROMAGNETIC DEVICE PARAMETERS ON THE BASIS OF 3D MAGNETIC FIELD TAKING ANISOTROPY INTO ACCOUNT
L. Nowak, A. Demenko, K. Kowalski, W. SzelagPaper presents an effective iterative method for 3D magnetic field calculation taking the nonlinearity and anisotropy of the material into account. Algorithm for simulation of…
COUPLING OF COILS BY AN OPEN MAGNETIC CORE AND ELECTROMAGNETIC SCREEN EFFECTS
K. Pawluk, M. KucharskaStationary and quasi‐stationary boundary‐integral models for magnetic and electromagnetic fields in 3D arrangements composed of coils, cores and screens are given. The test…
ANALYTICAL SOLUTION FOR THE EDDY CURRENT PROBLEM INSIDE A CONDUCTING CYLINDER USING THE SECOND ORDER MAGNETIC VECTOR POTENTIAL
T.P. Theodoulidis, C.S. Antonopoulos, E.E. KriezisThe evaluation of eddy currents in cylindrical geometries is examined analytically by using a method, which utilises the second order magnetic vector potential. As an example the…
A SYSTEMATIC APPROACH TO THE CONSTRUCTION OF HIGHER ORDER VECTOR FINITE ELEMENTS FOR THREE‐DIMENSIONAL ELECTROMAGNETIC FIELD COMPUTATION
T.V. Yioultsis, T.D. TsiboukisThe importance of vector finite elements for electromagnetic field computation has been extensively demonstrated in the recent literature. In this study we present a systematic…
CALCULATION OF THE TANGENTIAL COMPONENTS OF THE MAGNETIC FIELD STRENGTH FROM VECTOR POTENTIALS FOR 3D
Wojciech Demski, Grzegorz SzymańskiNormal components of B and the tangential components of H alike are needed for the force calculation. If the field is calculated numerically, only one of these components is known…
WAVE PROPAGATION IN THE ALGEBRA DIFFERENTIAL FORMS AND VARIATIONAL PRINCIPLES
D. Baldomir, C. CampoyIn this paper we present a variational method which fits very well in the wave behaviour of electrodynamics.
INFINITE ELEMENTS FOR 2D UNBOUNDED WAVE PROBLEMS
S. Gratkowski, L. Pichon, A. RazekA basic difficulty encountered in applying the finite element method to unbounded wave problems is that the domain in which the field is to be computed is unbounded, while finite…
ACCURACY OF FINITE ELEMENTS IN COMPUTING THE SYNCHRONOUS REACTANCES OF SURFACE AND BURIED PERMANENT MAGNET BRUSHLESS MOTORS
Mitchell Wing, Jacek F. GierasThe increased use of permanent magnet synchronous motors in small to medium power applications has made it imperative that these motors' performance can be modelled successfully…
THE COMPARISON OF THE METHODS USED FOR ESTIMATION OF CURRENT TRANSFORMER METROLOGICAL PROPERTIES
E. LeśniewskaIn the paper, research results on applying field methods in the process determining the parameters of a current transformer equivalent circuit have been published. The…
THE 3D ANALYSIS OF THE LEAKAGE FIELD IN A TRANSFORMER WITH DISK WINDINGS
M. Lukaniszyn, R. UnbehauenThe calculation of the leakage quasi‐stationary magnetic field of a three‐phase transformer with disk‐windings is presented in the paper. A mathematical model of the transformer…
END WINDING LEAKAGE CALCULATION OF A SQUIRREL‐CAGE INDUCTION MOTOR FOR DIFFERENT LOAD CONDITIONS
R. De Weerdt, K. Hameyer, R. BelmansThe calculation of the end winding leakage of a squirrel‐cage induction motor using a three‐dimensional finite element method is discussed. The end winding inductance is thought…
COMPUTATION OF ROTOR WINDINGS POWER LOSSES IN SQUIRREL‐CAGE INDUCTION MOTOR
M. Dems, K. Komęza, S. WiakDesigning of induction motors requires accurate calculation of the field distributions, especially in the case of PWM suppliers. The Finite Element Method (FEM) is useful tool for…
CONTRIBUTION TO THE TRANSIENT ANALYSIS OF INDUCTION MOTORS SOLVING THE ELECTRODYNAMIC EQUATIONS BY USING THE FINITE ELEMENTS METHOD
J. Roger‐Folch, V.J. Lázaro JoaresThis paper details how the equations describing the magnetic field inside the motor and the equations of its electric circuit can be integrated in one only system, which can be…
NUMERICAL SIMULATION OF HIGH SPEED INDUCTION MACHINE WITH SOLID ROTOR
E. Andresen, B. Racinowski, G. SzymańskiIn this paper the calculation method of High Speed Induction Machine with solid rotor is presented. 2D model is assumed. FD method is used. Nonlinear effect of permeability is…
CALCULATION OF PULSATING LOSSES IN THE AIR‐GAP OF SYNCHRONOUS RELUCTANCE MOTOR USING FINITE ELEMENT METHOD
Damijan Miljavec, Peter JerebThis paper presents the calculation of pulsating losses in the air‐gap at laminated stator and rotor pole surface of the synchronous reluctance motor (SRM). The calculation is…
TIME‐STEPPING FINITE ELEMENT METHOD IN DESIGNING OF PERMANENT MAGNET SYNCHRONOUS MOTORS
Wojciech Szelag, Andrzej Demenko, Lech NowakThe time‐stepping finite method of transient analysis in permanent magnet synchronous machines has been presented. This method has been used for determining the steady‐state and…
FEM SHAPING OF THE AIR‐GAP FLUX IN PERMANENT MAGNET DC COMMUTATOR MOTOR
Goga Cvetkovski, Lidija Petkovska, Milan ČundevThis paper deals with an analysis of the effects on the electromagnetic characteristics by changing the dimensions of the permanent magnets such as the overlap angle of the…
OPTIMUM GEOMETRY FOR TORQUE RIPPLE MINIMIZATION OF SWITCHED RELUCTANCE MOTORS
Funda Sahin, H. Bulent Ertan, Kemal LeblebiciogluThis paper briefly describes an approach to determine the optimum magnetic circuit parameters to minimize low speed torque ripple for switched reluctance (SR) motors. For…
THE OPTIMAL SCALING OF A LINEAR RELUCTANCE MOTOR BY FIELD COMPUTATION
M. Rizzo, A. SaviniThe work aims at investigating the law of miniaturization of a linear reluctance motor by expressing the ratio of force to mass as a function of bar position in per unit, for…
MAGNETIC FIELD OF HIGHTORQUE STEPPING MOTOR WITH MULTIPHASE SUPPLY
J. Wagner, D. Maga, R. Ort‐ŠnepIn spite of our previous results, where we have investigated the simplified 2D model, we would like to present our results coming out from real motor geometry. We use the Finite…
DESIGN OF A MULTI‐CHANNEL ROTARY TRANSFORMER FOR APPLICATION TO DIGITAL MAGNETIC RECORDING
James E. MonsonRotary transformers are important parts of magnetic tape recorders using cylindrical scanners. Typically, heads for recording and playback are mounted on a rotating cylinder which…
CALCULATION OF FLUX DISTRIBUTION IN TRANSFORMER CORE TAKING HYSTERESIS INTO ACCOUNT
A. Rezic, Z. ValkovicCalculation of flux distribution in three‐phase three‐limb transformer core has been made using 2D finite element method. The calculation has been performed with and without…
3D MAGNETIC FIELD DISTRIBUTION OF YOKE FLUX IN THREE‐PHASE TRANSFORMERS WITHOUT FERROMAGNETIC TANKS
K. Zakrzewski, B. TomczukThe 3D calculation of the monophase flux, due to n‐triple harmonics of the windings currents is considered. For small, three‐phase transformers without ferromagnetic tanks the…
CALCULATION OF 3D EDDY‐CURRENTS PROBLEMS IN NONLINEAR MAGNETIC FIELDS WITH VOLTAGE EXCITATION
Andrzej PateckiElectromagnetic field problems arising in electrical machinery and devices are in general truly three dimensional in nature. In many devices natural excitation is the voltage…
FIRST STEPS TOWARDS A FULL INTEGRATED CAD SYSTEM FOR ELECTRICAL MACHINES
C. Pertusa, S. Astier, Y. Lefevre, M. Lajoie‐MazencAn approach for electrical machines design by using a software which links the sizing procedure to the magnetic field computation is presented in this paper. After reviewing the…
NUMERICAL CALCULATION OF DEMAGNETIZING FACTOR FOR PERMANENT MAGNET
K. Muramatsu, T. Nakata, N. Takahashi, K. Fujiwara, H. UkitaRecently, rare earth magnets with high coercive force such as Nd‐Fe‐B magnets have been developed. When the magnetic characteristic (M‐H curve) of such a strong magnet is…
QUASI 3D MAGNETIC FIELD COMPUTATION FOR ANISOTROPIC SHEET LAYER STRUCTURE
Maria Pietruszka, Ewa Napieralska‐JuszczakThe paper presents quasi 3D magnetic field computation for anisotropic layer structure of transformer core, but this computation method can be also applied to other magnetically…
COMPUTER AIDED DESIGN OF LOW‐VOLTAGE LINEAR ACTUATOR
Vlatko Stoilkov, Milan Čundev, Lidija Petkovska, Krste NajdenkoskiThe paper offers an approach to Computer Aided Design of low‐voltage linear actuators, from the aspect of geometry, as the level preceding their optimal design. Magnetic circuit…
DESIGN OPTIMIZATION OF AN ELECTROSTATIC MICROMOTOR WITH AXIAL FIELD
P. Di Barba, A. Savini, S. WiakHistorically, the idea of using electrostatic phenomena to produce motion has long stimulated the activity of scientists. Although the power generated by electrostatic motors is…
EFFICIENT SIMULATION ALGORITHM FOR THE FULL VECTORIAL WAVE PROPAGATION IN THE POLARISATION DEPENDENT STRUCTURES OF INTEGRATED OPTICS
Albrecht Kunz, L'ubomir ŠumichrastPropagation of electromagnetic waves through InP‐based integrated optics structures is directly simulated by solving the full vectorial wave equation in parabolic approximation…
THE APPLICATION OF THE SUPERCONDENSED TLM NODE TO PROPAGATION PROBLEMS IN INHOMOGENEOUS ANISOTROPIC MATERIALS
V. Trenkic, C. Christopoulos, T.M. BensonA super‐condensed TLM node for modelling inhomogeneous anisotropic media on an arbitrarily graded mesh without using stubs is developed. It requires less storage, computationally…
TRANSIENT ANALYSIS OF ELECTROMAGNETIC FIELD PROPAGATION IN THE VICINITY OF MILLIMETRE WAVEGUIDE STRUCTURES WITH AN EFFICIENT FINITE‐DIFFERENCE TIME‐DOMAIN TECHNIQUE
N.V. Kantartzis, E.E. Kriezis, T.D. TsiboukisThe FDTD approach is rapidly becoming one of the most widely used computational methods in electromagnetics. It is a marching‐in‐time procedure which simulates the continuous…
SURFACE POWER LOSSES IN THE CORE OF INDUCTION MOTORS SUPPLIED BY A PWM VOLTAGE INVERTER
Jan Anuszczyk, Zbigniew GmyrekThe calculation of additional power loss components in an induction motor supplied from a PWM inverter has been carried out with the assumption of constant load torque, the…
SIMULATION OF AN ELECTROMAGNETIC ACTUATOR BY A COUPLED MAGNETO‐MECHANICAL MODELLING
B. Gaspalou, F. Colamartino, C. Marchand, Z. RenThis paper presents a model for the simulation of dynamic behaviours of a coupled magneto‐mechanical system. The magnetic equation is solved with the help of the finite element…
ELECTROMAGNETIC FIELDS IN TRACTION SYSTEMS: MODELLING AND APPLICATIONS
S. Brillante, R.J. Hill, P.J. Leonard, P. PozzobonA two‐dimensional electromagnetic field model of a railway track and traction line is used to determine the equivalent track distributed transmission line parameters in the…
AN IDENTIFICATION AND AN APPROXIMATION OF NONLINEAR CHARACTERISTICS OF THREE‐PHASE WINDING
Adam WarzechaElectrical machines with nonlinear magnetic circuits are usually modelled by coupling magnetic and electric equations using software for magnetic field investigation. These hybrid…
A STUDY ON THE INFLUENCE OF AXIS PARALLEL COOLING DUCTS ON THE FIELD IN HIGHLY SATURATED INDUCTION MACHINES USING NUMERICAL FIELD CALCULATION
R. Zwingel, L. Jänicke, M. Stichler, A. KostWhile optimizing highly utilized induction machines — e.g. for traction applications — the problem of cooling is of importance. The necessary cooling ducts in the rotor lead to…
ELECTROMAGNETIC FIELD INVESTIGATIONS INSIDE A HOLLOW CYLINDER
Terence J. Wieting, Tim D. Andreadis, John M. Kidd, Wayne Quade, Arthur I. Namenson, Louis F. Libello, Christian D. Schleisiger, Chalmers M. ButlerThe behaviours of the electric and magnetic fields inside a conducting cylinder with a single axial aperture are not as well understood as is commonly believed. The experimental…
THE MAGNETOSTRICTION FORCES IN THE INDUCTION MOTOR
Pawel WitczakThe paper describes how the classical formula of the Maxwell magnetic stress tensor may be extended to cover the magnetostriction phenomena. It is assumed that the ferromagnetic…
ON THE INDUCTANCE AND FORCE CALCULATION OF A THREE AXES TORQUE MOTOR
E. Andresen, M. AndersA three axes torque motor for adjusting an airborne telescope to fixed points in the space is shortly presented. Different calculation methods for inductance and force…
MAGNETIC FIELD AND FORCE CHARACTERISTICS OF A SOLENOID ACTUATOR FOR DISPLAY BOARD APPLICATION
M.R. Harris, J.K. SykulskiThe work described concerns a technical assessment of a small linear actuator that was developed for use in large, electronically controlled, electromechanical display boards…
ANALYSIS OF THE DISPLACEMENT FORCE ON THE FERROMAGNETIC MATRIX IN MAGNETIC FIELDS
Antoni Cie&sacutela, Andrzej MatrasThe magnetic filter with the superconductive electromagnet as the source of the field is considered. The manufacturing process with that device needs the cycling removal of the…
ANALYTICAL CALCULATION OF DOUBLE‐SIDE PLANAR TRAVELLING WAVE INDUCTION HEATING SYSTEMS
F. Dughiero, S. Lupi, P. SiegaThe heating of flat workpieces of different materials and geometrical characteristics (width, thickness) is often required in the metal industry. The temperature requirements…
A SEMI‐ANALYTICAL METHOD FOR EVALUATION OF THE 3D INHOMOGENEOUS INDUCTION HEATING OF A MOVING HOLLOW CYLINDER
L. Gong, R. Hagel, K. Zhang, R. UnbehauenA semi‐analytical algorithm for the calculation of 3D induction heating of a uniformly moving conducting and permeable steel shell is presented. The eddy current field problem is…
INFLUENCE OF THE THERMAL DEPENDENCY OF THE CURRENT DENSITY IN THE SOLUTION OF THE HEAT TRANSFER PROBLEM USING THE FINITE ELEMENT APPROACH
JoséAmérico Dias Pinto, António Paulo Breda Coimbra, Carlos F.R. Lemos AntunesIn this paper it is proposed a thermal Finite element formulation that accommodates the current density dependency on the resistivity variation with temperature. As an application…
SOFT MAGNETIC MATERIAL POWER LOSSES IN HARMONIC REGIME
Ioan D&acaronnut Olteanu, Elena Helerea, Mihai CernatMagnetic power losses in harmonic magnetizing regime: The soft magnetic materials used as magnetic cores in wide frequency band transformers for DC/DC converters must be…
MODELLING AC LOSSES IN HIGH‐TEMPERATURE SUPERCONDUCTORS AS A NONLINEAR DIFFUSION PROCESS
R.L. Stoll, A.E. Mahdi, J.K. SykulskiCeramic superconductors experience losses when carrying alternating currents. A first step in an attempt to macroscopically model the loss mechanism is to consider the ac…
INTERACTION OF ELF ELECTROMAGNETIC FIELDS WITH VARIOUS MODELS OF THE HUMAN BODY
A. Karanikolos, P.K. Pantelakis, E.E. KriezisThe interaction of ELF‐LF electric fields with the human body is examined with a method based on surface charge‐integral equations. The evaluation of the electric field intensity…
DISTRIBUTION OF HEATING POTENTIAL IN AN ECCENTRIC SPHERES MODEL OF A CRANIAL STRUCTURE
N.C. Skaropoulos, D.P. ChrissoulidisWe determine the electromagnetic (EM) field in a layered eccentric spheres model of the human head. The model allows for eccentricity between the inner and the outer sets of the…
MAGNETOTHERAPY DUE TO EDDY CURRENTS INDUCED IN NEURAL CELLS BY MAGNETIC STIMULATION
Andrzej Krawczyk, Tadeusz Skoczkowski, Tomasz ZyssThe problem of generating currents of neural cells in human brain has been recently investigated, as it is believed to substitute electroconvulsive therapy (ECT) having the same…
PROPERTIES OF COILED CORE MADE OF COLD ROLLED SHEETS WITH FREQUENCY UP TO 2000HZ
Andrzej Buze, Andrzej KrawczykElectrical properties of magnetic material are mainly defined by producers by means of magnetic characteristics H = ƒ(B) and loss characteristics p = ƒ(B), both for industry…
ANALYSIS AND OPTIMIZATION OF PLANAR THICK FILM NI‐FERRITE INDUCTOR
S.M. Jenei, O.S. Aleksić, L.D. Živanov, D.I. RakovićNi‐ferrite powder average grain size less than 0.9µm was used for the ferrite paste preparation. Ferrite paste was printed on Al2O3 substrate and fired 850°C/10min. After…
USING HARMONIC PARAMETERS FOR CHARACTERIZATION OF SOFT MAGNETIC MATERIALS UNDER NON‐SINUSOIDAL CONDITIONS
Jean‐Paul Swan, Olivier Walti, Jean‐Fraçois BrudnyElectrical machines are more and more fed by static converters. These power supplies impose nonsinusoidal statoric waveform to the machines. In these conditions, behaviour of…
EXPERIMENTAL DESIGN OF PERMANENT MAGNET DEMAGNETIZATION CURVE USING APPROXIMATING EQUATIONS
Zdzislaw ŻyckiToday the parameters and characteristics of permanent magnets are determined by means of computer as well as analogue‐to‐digital technics. Also digitizing oscilloscopes owing to…
COMPUTATION OF FIELD ERRORS DUE TO POLOIDAL CUTS ON THE STABILIZING SHELL OF A FUSION DEVICE
P. Fiorentin, G. Marchiori, A. Masiello, G. ZollinoAn analytical model, based on Fourier expansion of the eddy current components on a cylindrical shell, which was already developed and tested on a fusion device, has been further…
ELECTROMAGNETIC EFFECTS ON TOKAMAK IN‐VESSEL COMPONENTS IN PLASMA OFF NORMAL CONDITIONS
John Sakellaris, Yves CrutzenDuring plasma disruption events in tokamaks, a large amount of magnetic energy is associated to the transfer of plasma current in eddy currents into the passive structures. In the…
QUASI‐STATIONARY ANALYSIS OF STAR AND POLYGONAL LINEAR GROUNDING STRUCTURES
Z.P. Stajić, P.D. Rančić, B.S. Tošić, Dj. R. DjordjeviThe unknown current distribution (UCD), line leakage current density (LLCD) and other integral characteristics of a linear grounding structure (GS), shaped either as an arbitrary…
THE USE OF FINITE ELEMENT ELECTROMAGNETICS PACKAGES IN UNDERGRADUATE COURSES
R.A. Ashen, R.E. Colver, K. RashidCAD methods and purpose‐designed software packages are now widely used in engineering practice and it is important to introduce students of undergraduate courses to these in…
INTEGRATING ELECTROMAGNETIC FIELDS INNOVATIONS IN AN UNDERGRADUATE CURRICULUM
Daniel M. Litynski, Karl E. Reinhard, Bradford C. TousleyIntroduction The Department of Electrical Engineering (EE) and Computer Science (CS) educates future national defence leaders in the theory and practice of its two disciplines and…
THE ROLE OF THE KNOWLEDGE ON ELECTROMAGNETISM FOR ELECTRIC ENGINEER EDUCATION
R. Sikora, M. ZeńezakIntroduction Depending on the way of teaching process organization the theory of electromagnetic field is considered either as a part of theoretical electrical engineering or as…
EFFECTIVE TRAINING IN THE INTERACTIVE SOLUTION OF COMPLEX 3D ELECTROMAGNETIC PROBLEMS
J. Turowski, Z.J. PudlowskiIntroduction Academic institutions involved in electrical engineering education now realise the importance of students' understanding of the concepts of magnetic fields and their…
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0332-1649Online date, start – end:
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Emerald Publishing LimitedOpen Access:
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- Prof Jan Sykulski