COMPEL - The international journal for computation and mathematics in electrical and electronic engineering: Volume 11 Issue 1
Table of contents
COMPUTER OPTIMIZING OF ELECTROMAGNETIC DEVICES
CW TrowbridgeThe optimization of geometric boundaries and placement of conductors to achieve specific design goals is the principle activity in computational electromagnetics. However the…
COMPLEMENTARITY IN NONLINEAR MAGNETOSTATICS: BILATERAL BOUNDS ON THE FLUX‐CURRENT CHARACTERISTIC
A. BossavitThe relation between the flux F in a magnetic circuit and the driving current J, or characteristic of the circuit, is described by a curve in the principal quadrant of the J—F…
FIELD CALCULATION IN SINGLE CYLINDERS OF INFINITE LENGTH BY USING A COUPLED T‐Ω AND A BOUNDARY ELEMENT TECHNIQUE
C.S. Antonopoulos, T.D. Tsiboukis, E.E. KriezisA method, which is using the electric vector potential T and the magnetic scalar potential Ω is presented for the calculation of the electro‐magnetic field inside conducting…
AN EFFICIENT SOLUTION FOR DIELECTRIC‐LOADED OR RIDGED WAVEGUIDES PROBLEMS
L. PICHON, A. BOURHATTAS, A. RAZEKWe present in this paper an efficient finite element analysis for different types of waveguides . The computations are performed with “edge elements” . These finite elements avoid…
FIELD EQUATIONS EXPRESSED BY COMPLEX CONJUGATE VARIABLES
Miroslaw DabrowskiInterest in numerical methods for solving electromagnetic field problems has in the last years set back the development of analytical methods. However, analytical methods can be…
ON THE USE OF THE IMPEDANCE BOUNDARY CONDITION WITH A ONE‐COMPONENT MAGNETIC FIELD FORMULATION
Modest Gramz, Marek ZiólkowskiThe impedance boundary condition is widely used in order to reduce a multiple region electromagnetic field problem to a magnetic field problem analyzed in a nonconducting region…
ON THE INHERENT GEOMETRY OF ELECTROMAGNETISM AND THE GEOMETRY OF ELECTROMAGNETIC SYSTEMS
D Baldomir, P HammondThe paper explores the geometrical structure of electrodynamics using the algebra of differential forms. Stokes' theorem links the local to the global geometrical features of…
INDIRECT INTEGRAL‐BOUNDARY MODEL OF 3‐D MAGNETIC FIELD
K. PawlukIn the paper the boundary‐integral model of the stationary magnetic field in a 3‐D linear region is presented. The region is bounded from inside or from outside by metallic…
3‐D CALCULATION OF MAGNETIC AND ELECTRIC FIELDS BY FDM USING FAST SOLVING SUBROUTINES
K. Zakrzewski, M. LukaniszynThe calculation of quasistationary magnetic fields and electrostatic fields of several objects is presented in the paper. In the range of the magnetic fields of coils and…
ACCURATE INTEGRATIONS IN THE BOUNDARY ELEMENT METHOD FOR 2D‐ EDDY CURRENTS
Jinxing Shen, Amulf KostAn accurate integration is one of the key steps in the application of the Boundary Element Method (BEM) to the computation of electromagnetic fields. The integrations are…
ERROR BOUNDS IN DUAL & COMPLEMENTARY EDDY‐CURRENT SYSTEMS
J PenmanThe formulation of electromagnetic field problems using dual and complementary energy methods is now well established, and the advantages of the error bounds to system energy for…
DEVELOPMENTS IN TRANSMISSION LINE MODELLING AND ITS APPLICATION IN ELECTROMAGNETIC FIELD SIMULATION
R.A. Scaramuzza, C. ChristopoulosTransmission line modelling is a technique that can be applied to the analysis and design of electromagnetic devices. Developments to the method are described which improve its…
AN EFFICIENT OPEN BOUNDARY FINITE ELEMENT METHOD FOR ELECTROMAGNETIC PROBLEMS
A. StochniolAn efficient approach for the solution of open boundary field problems with the finite element method is presented. The principle of the solution method consists in the spatial…
A USER ORIENTED SHELL FOR ELECTROMAGNETIC CAD OF AXISYMMETRIC DEVICES
A. Stochniol, E.M. Freeman, D.A. LowtherA special shell for a general purpose FEM package (MagNet) for the electromagnetic CAD of axisymmetric devices is presented. The basic idea of the shell is that a script file may…
COMPUTATIONAL MODELS FOR STAGGERED BUTTED JOINTS IN LAMINATED FERROMAGNETICS
Peter P. Silvester, Dževat OmeragićThe conventional representation of a laminated packet of electrical sheet steel as a homogeneous but anisotropic material is extended by treating any butted joints in the packet…
COMPUTATIONAL ERROR IN REDUCED SCALAR MAGNETIC POTENTIAL PROBLEMS
Peter P. Silvester, Michel DufresneThe reduced scalar potential representation of magnetic fields is widely believed to be numerically unstable where large permeability contrasts (e.g., 1000:1) prevail. This belief…
FINITE ELEMENT MODELLING OF INDUCTIVE SENSORS
J.K. Sykulski, R.L. StollPractical aspects of finite‐element modelling of magnetic fields and calculating integral parameters such as a reflected impedance in inductive sensing devices are discussed. The…
APPLICATION OF FINITE ELEMENT MODELLING IN LVDT DESIGN
J.K. Sylculslci, E. Sykulska, S.T. HughesApplication of finite‐element modelling of magnetic fields in a linear variable differential transformer (LVDT) is demonstrated and electromagnetics of such devices briefly…
MODELLING VERY SMALL AIR GAPS BETWEEN MAGNETIC SURFACES IN FINITE‐DIFFERENCE FIELD SOLUTIONS
R.L. StollThe finite‐difference discretization required to model accurately very small air gaps between ferromagnetic surfaces can be enormous. Provided the surrounding permeability is…
BENCHMARK TESTS FOR OPEN BOUNDARY PROBLEMS
Jan Sroka, Jacek StarzyńskiIn the paper establishing the benchmark tests for open boundary problems as it has been done in other branches of electromagnetic field calculations is proposed. Consideration is…
NUMERICAL SIMULATION OF ELECTRON TRAJECTORIES FOR EELS
L. Vattuoneb, M. Repettoa, M. RoccabElectron energy loss spectrometers (EELS) for surface studies require a high energy resolution (▵E ? 3 meV) monochromatic electron beam with the highest possible current. In order…
ANALYSIS OF CONTROL MOTOR WITH DRAG‐CUP ROTOR TRANSIENTS
A. DemenkoThe time‐stepping finite element method for the analysis of the electromagnetic and electromechanic transients in the control motor with the drag‐cup rotor has been presented. The…
CALCULATION OF ADDITIONAL SLOT LEAKAGE PERMEANCE IN ELECTRICAL MACHINES DUE TO RADIAL VENTILATION DUCTS
A. Demenko, K. OberretlThe 3D magnetic field in the region with ventilation duct of electrical machine has been analyzed. The method of reduced scalar magnetic potential in connection with the FE method…
MAGNETIC FIELD ANALYSIS IN SHADED‐POLE TYPE INDUCTION MOTOR
T. Matsubara, Y. Ishihara, S. Kitamura, Y. InoueShaded‐pole type induction motors are simple structure, strongly‐built and low cost since they have no condensers. Therefore they are used generally in cooling fans in the devices…
MATHEMATICAL DESIGN OPTIMIZATION OF A PERMANENT MAGNET SYNCHRONOUS MOTOR WITH FD FIELD CALCULATION METHOD
S. Russenschuck, E. Ch. AndresenA six pole 3 kW synchronous motor with rare earth magnet excitation is used as an ex‐ample for mathematical design optimization on the basis of the FD field calculation method…
MODELLING TOOTH RIPPLE LOSSES IN THE SOLID POLE FACES OF SYNCHRONOUS MACHINES
R.L. Stoll, J.K. SytulskiThe armature slots produce flux density pulsations in the pole face and hence eddy current losses, the calculation of which has not been fully satisfactory to date. One…
CURRENT SHEETS EQUIVALENT TC END WINDING CURRENTS OF INDUCTION MOTOR ROTOR AND DETERMINATION OF THE MAGNETIC FIELD IN THE END ZONE. Part I Flux densities due to stator end winding
J.A. Tegopoulos, P.P. Yannopoulos‐LascaratosThe purpose of this paper is to replace the end winding current distribution of the squirrel cage rotor of induction motors with appropriate current sheets of sinusoidal…
CURRENT SHEETS EQUIVALENT TO END WINDING CURRENTS OF INDUCTION MOTOR ROTOR AND DETERMINATION OF THE MAGNETIC FIELD IN THE END ZONE. Part II. Flux densities due to rotor end winding
J.A. Tegopoulos, P.P. Yannopoulos‐LascaratosThe end winding current distribution of the squirrel cage rotor consists of (Fig.1) : a peripheral current flowing in the end ring of the cage placed at a distance ar from the end…
TWO‐DIMENSIONAL APPROXIMATIONS TO THREE‐DIMENSIONAL FIELDS IN AN ACTUATOR
C.J. Carpenter, W. AffaneFig.1 shows a permanent magnet bistable actuator operated by switching the current in alternate directions. It is characterised by long air gaps, and, for mechanical reasons, the…
ANALYSIS OF MAGNETIC FIELDS IN TRANSFORMER CORES USING PERSONAL COMPUTERS
A. BASAK, C.H. YUThe finite element technique has been used to develop a software package which, with the help of an IBM/PC 386 computer, can determine two dimensional magnetic fields and power…
THE PRACTICAL APPLICATION OF FEM TECHNIQUES IN TRANSFORMER DESIGN & DEVELOPMENT
V DarleyPower 4 Distribution Transformers are complex assemblies of metallic and insulating materials which generate equally complex electrostatic and electromagnetic fields.
3D FINITE ELEMENT MODELLING OF ELECTROMAGNETS AND TRANSFORMERS BY USING A PARTICULAR SCALAR POTENTIAL TECHNIQUE
A.G. Kladas, J.A. TegopoulosThe design of several electromagnetic devices, such as magnets and transformers, leads to a 3D magnetostatic field analysis. Although such problems can be solved by using vector…
TANGENT FORCES IN TRANSFORMER WINDINGS AT SHORT‐CIRCUIT
A.I. Lurie, V.P. Zenova, A.N. PanibratetzThe tangent forces can arise during the interaction of the current, flowing in axial and radial direction, with magnetic inductance components. The tangent forces, acting on the…
SOME ASPECTS OF ADDITIONAL LOSSES IN STEP‐LAP JOINTS OF TRANSFORMER CORE
Z. ValkovićMagnetic properties of step‐lap joints have been investigated experimentally on scale‐models of a three‐phase three‐leg transformer core. The influence of core induction, number…
3‐D COMPUTATION AND REDUCTION OF STRAY LOSSES IN TRANSFORMER TANKS WITH COMBINED Cu & Fe SCREENS
J. Turowskl, M. Kope&cacute, M. TurowskiAt the ISEF'89 Symposium in Lodz an application of the fast reluctance network method and the computer program RNM‐3D for analysis of leakage fields and combined 3‐D screens of…
TRANSFORMER WINDING LEAKAGE FIELD EFFECTS AND THEIR CALCULATION
David Thompson, Qunjing WangThis contribution describes for one particular 45/90 MVA transformer design the results of finite element calculations of its leakage field and winding forces. The results show…
NEW ELECTROMAGNETIC PUMP BASED ON THE EFFECT OF MAGNETIC FLUX CONCENTRATION
K. Bessho, A. Krawczyk, K. NakamotoEddy currents, being of either positive or negative nature, have recently gained more and more importance in their positive aspects. New devices that may be called “eddy current…
AN ELECTROKINETIC MOMENTUM INTERPRETATION OF THE FIELDS IN ELECTROMAGNETIC DEVICES
C.J. CarpenterThe usual foundation of machine theory is the flux linking law for emf
FIELD AND FORCE CALCULATION OF ELECTROMAGNET WITH HIGH FREQUENCY OPERATION
K. Komeza, J. Tarocinski, S. WiakThis paper deals with the field and force calculation in a model electromagnet which is the power drive of the shuttle loom. Hermitian hierarchical finite elements have been…
A 3‐D SPACE ANALYSIS OF AN ELECTROMAGNETIC FIELD IN A THREE PHASE INDUCTION PUMP WITH A COMPENSATING WINDING
E. Gierczak, E.A. MendrelaThree‐phase inductors with a magnetic travelling field are often used to pump a liquid metal or to stir it in induction stirrers. Due to a finite length of inductor an alternating…
APPLICATION OF COUPLING FIELD‐CIRCUIT FORMULATION FOR FAST ACTING ELECTROMAGNETIC ACTUATORS SUPPLY SYSTEMS DESIGN
Lech NowakAn electromechanical converter supplied with the special feed systems which accelerate its operation in transient states is investigated. To solve the problem the field‐circuit…
ANALYSIS OF ELECTROMAGNETIC FORCES AND MECHANICAL BEHAVIOUR IN A TUBULAR INDUCTION DEVICE WITH A HYBRID F.E.M‐B.E.M TECHNIQUE
L. Pichon, A. RazekIn the proposed paper a model permitting force analysis in tubular induction devices is presented. A hybrid finite element‐boundary element method using time stepping is used to…
CALCULATION OF TRANSIENT ELECTROMAGNETIC FORCES IN AN AXISYMMETRICAL ELECTROMAGNET WITH CONDUCTIVE SOLID PARTS
N. Sadowski, Y. Lefevre, M. Lajoie‐Mazenc, J.P.A. BastosThe paper describes the analysis and the calculation of transient response of a voltage fed electromagnet. This calculation is based on the simultaneous solution of the magnetic…
SIMULATION OF THE INDUCTION HEATER SUPPLIED FROM THYRISTOR INVERTER
T. SkoczkowskiThe classical methods of designing induction heaters, usually supplied from the network or machine medium frequency generators, require the following assumption to be made: the…
SOLUTION OF MAGNETIC HEAD FIELD PROBLEMS USING THE BEM
H.‐G. Jahnke, G. Schmidt, H. StreseAt ISEF'89 we spoke about our work concerning two dimensional (2D) modelling of magnetic heads. Starting with the magnetostatic transmission problem for a magnetic domain with…
AIR‐GAP FIELD ANALYSIS AND DETERMINATION OF TORQUE OSCILLATIONS IN THE ASYNCHRONOUS MACHINE
J.F. BRUDNY, Ph. DELARUE, F. NOTELETThe torque harmonics generated by asynchronous machine slotting are essentially linked to air‐gap permeance variations due to the rotor rotation. These variations lead to machine…
STRAY LOSSES IN A SINGLE‐SIDED LINEAR INDUCTION MOTOR
Jacek F. GierasThe paper deals with the method of the stray losses calculation in single‐sided linear induction motors. The stray losses produced by the higher space harmonics of the primary…
SIMPLE METHOD FOR CALCULATING THE PEAK TORQUE OF A SWITCHED RELUCTANCE MOTOR: A COMPUTATIONAL INVESTIGATION
M.R. Harris, J.K. SykulskiThe tractive force between two slightly overlapped steel teeth exhibits a remarkably linear relationship with m.m.f. over a considerable range of variables. This occurs despite…
ANALYTICAL PREDICTION OF THE AIRGAP FIELD DISTRIBUTION IN PERMANENT MAGNET MOTORS ACCOUNTING FOR THE EFFECT OF SLOTTING
Z Q Zhu, D HoweAlthough several papers have been published on the calculation of the open‐circuit airgap field of permanent magnet excited radial‐field motors, most analytical models are framed…
FEM AIDED OPTIMIZATION OF PERMANENT MAGNET DIMENSIONS IN A DC MOTOR WITH HYBRID EXCITATION
Tamasz ZoodzinskiIn the paper the optimization procedure of a direct current motor with a hybrid excitation has been presented. The excitation system consists of a shunt field winding disposed…
ON THE OPTIMAL DESIGN OF AIR‐CORED SOLENOID INDUCTORS OF RECTANGULAR CROSS‐SECTION
P. Di Barba, A. Savini, M. RudnickiAn attempt is made of formulating the optimal design problem of air‐cored inductors in a systematic and straightforward way. The numerical solution is obtained by means of…
THE ESTIMATION OF METROLOGICAL CHARACTERISTICS OF INSTRUMENT TRASFORMERS IN RATED AND OVERCURRENT CONDITIONS BASED ON THE ANALYSIS OF ELECTROMAGNETIC FIELD
Elźbieta Leśniewska, Wieslaw JalmuźnyProblems of correct estimation of metrological characteristics of current transformers based on constructional data and working conditions are of great importance. Applying the…
THE FEM ANALYSIS OF NONSYMETRICAL SHORT CIRCUIT FORCES AND FIELDS IN THE WINDOW OF CONVERTOR TRANSFORMER
Ewa Napieralska Juszczak, MichałThe paper describes the simulation of a short circuit of one diode in a three‐phase convertor set connected to a 2 winding transformer. The forcing currents are computed with the…
MAGNETOSTATIC FIELD CALCULATION OF 3‐D NON‐LINEAR MODEL BY RELUCTANCE NETWORK METHOD (Problem No.13‐TEAM Workshop)
S. Wiak, A. Pelikant, J. TurowskiMagnetostaic field analysis of 3‐D nonlinear model problem (No.10 ‐ TEAM Workshop) is carried out by the authors using the Reluctance Network Method. The components and resultant…
3‐D CALCULATION OF MAGNETIC FIELD AND INDUCTANCE OF A REACTOR, WITH OPEN MAGNETIC CORE, BY INTEGRAL EQUATIONS METHOD
K. Zakrzewski, B. TomczukThe reactor with rectangular shape of the winding turns and open magnetic core has been considered in the work. The integral equation has been solved numerically and components of…
DESIGN, ANALYSIS, AND SIMULATION OF IMPULSE MAGNETIZATION SYSTEMS BASED ON SOLENOID MAGNETIZING FIXTURES
N A Al‐Anani, Jewell D GW HoweDue to their high magnetizing field requirement, the emergence of rare‐earth based permanent magnets is creating onerous demands on the capacitor‐discharge systems which are used…
INTERNAL BEHAVIOUR OF LARGE COILS SUBJECT TO TRANSIENT VOLTAGE
P.P. Campostrini, G. Chitarin, A. Stella, G. ZollinoThis paper deals with the problem of internal overvoltages within large coils due to fast‐rising surges. Numerical simulations are performed on a lumped‐parameter equivalent…
A THREE‐DIMENSIONAL LUMPED‐PARAMETER MODEL FOR MHD DEVICES
A. Geri, G.M. VecaIn this paper the authors apply a three‐dimensional lumped parameter model (3D‐LPM) to evaluate the behaviour of an electromagnetic d.c. pump. Whit reference to the same device we…
ELECTRIC STRESS DISTRIBUTION IN POLYMERIC INSULATION CONTAINING DEFECT SITES AND SPACE CHARGE
AE Davies, G ChenPolymeric insulation is progressively replacing traditional materials in cables, switchgear and machines. The fundamental electricl properties of polymer dielectrics such as…
ADAPTIVE ALGORITHMS IN EDDY‐CURRENT NONDESTRUCTIVE TESTING
K.M. GawrylczykLow frequency eddy current technique is being widely used for the nondestructive testing of metal objects. Computer simulation for eddy current nondestructive testing of metal…
MODELLING OF FLAW RESPONSES IN EDDY CURRENT TESTING
K. Gawrylczyk, M. Gramz, S. Gratkowski, R. Sikora, M. ZidlkowskiThis paper presents the practical configuration for detecting cracks in material, by applying an electromagnetic field along the largest dimension of the crack. An electromagnetic…
A‐POSTERIORI ADAPTIVE MESH REFINEMENT IN THE FINITE ELEMENT EDDY CURRENT COMPUTATION
N.A. Golias, T.D. TsiboukisTwo a‐posteriori error estimators are presented for adaptive mesh generation in eddy current finite element computation : the discontinuity of the magnetic flux density on the…
DISTRIBUTION OF EDDY CURRENTS INDUCED IN STEEL PLATES NEAR THREE‐PHASE CONDUCTORS
T. Nakata, N. Takahashi, K. Fujiwara, Y. Kawase, S. MoriyasuWhen large currents flow near steel plates in large electric machines, the eddy current loss produced in the plates causes local overheating. Therefore, not only the total loss…
ISSN:
0332-1649Online date, start – end:
1982Copyright Holder:
Emerald Publishing LimitedOpen Access:
hybridEditor:
- Prof Jan Sykulski