COMPEL - The international journal for computation and mathematics in electrical and electronic engineering: Volume 17 Issue 3

Field and power loss distribution on covers of power transformers

A. Pelikant, J. Turowski

Heavy current bushings passing through steel cover plates and housing walls of power transformers, generators and other large power equipment are thermally hazardous elements of…

Computer simulation of dynamic states of the silicon micromotor

Adam Pelikant, Sl§awomir Wiak, Krzysztof Kome5za

This paper presents the results of silicon micromotor static and dynamic simulations by means of finite element method and the Moulton‐Adams algorithm as well. Capacitance and…

Evaluation of the high voltage transmission line inductance and capacitance using the finite element approach

J.A. Dias Pinto, A. Paulo Coimbra, Paulo G. Pereirinha, C.F. Lemos Antunes

In this paper the per phase inductance and the capacitance to neutral of a 220kV three‐phase overhead transmission line are calculated using a 2D finite element formulation. This…

Effect of the non‐linearity of demagnetization curves on the torque of hybrid stepping motors with permanent magnets in slots

M. Rizzo, A. Savini, J. Turowski

The recent achievements in electronic control as well as the higher performance of advanced permanent magnets have brought about a change in the general strategy for design and…

The non‐linear characteristics of AC machines based on the calculation of magnetic field co‐energy

Adam Warzecha

Non‐linear characteristics, as relations between linked fluxes and currents of individual machine coils, are sought for in the so called circuit models of saturated electrical…

Identification of thermal parameters in a coupled magnetic‐thermal model with the experimental designs method

J.M. Allegre, C. Marchand, A. Razek

In analysing coupled electromagnetic thermal behaviours in electrical devices one of the main difficulties is related to the uncertainties of thermal parameters. The authors…

Numerical modeling of transient heating of solid plate 3D structure

J. Barglik, K. Komecza, B. Ulrych, S. Wiak

The heating of flat metal products has an increasing importance in different technical applications. One of the most advanatageous heating methods is induction heating. The heat…

An easy and fast 2D finite element program for studying the fields in three‐phase transformers

G. Cannistrà, A. Covitti, M. Sylos Labini

All the algorithms introduced by the authors in their finite‐element computational program for studying fields easily and quickly are described in the paper. Moreover, an…

Loss evaluation of non‐magnetic tie‐plates in transformers

Z. Cheng, S. Gao, J. Wang, H. He, Z. Liu, M. Wu, H. Li, Q. Hu

This paper tests the eddy current analysis methods based on TEAM benchmark model, evaluates the engineering effectiveness of the eddy current codes through product‐based test…

Electromagnetic torque calculation in 3D systems with rotating field

Wojciech Demski, Grzegorz Szymánski

An algorithm to study a 3D system with rotating field using complex A, A‐V formulation in finite difference solution is presented. Torque calculations are performed using volume…

A numerical investigation of Preisach and Jiles models for magnetic hysteresis

H. Igarashi, D. Lederer, A. Kost, T. Honma, T. Nakata

The Preisach and Jiles models for hysteresis are applied to reconstruct BH loops from measurement data for constructional steel St 37. The distribution function for the Preisach…

Ultra high torque SRM ‐ measurement and computer design

D. Maga, J. Wagner

A prototype of a special electrical machine ‐ double statored switched reluctance motor ‐ has been developed which produces a very high static and dynamic torque. Possible ways of…

Finite element method in evaluation of torque ripple in synchronous reluctance motor

Damijan Miljavec

The paper deals with the calculation and reduction of torque pulsation in synchronous reluctance motors (SRM). The analysis is based on finite element modeling and proposes a…

Electromagnetic forces calculation on power transformer windings under short circuit

Krste Najdenkoski, Dionis Manov

This paper aims to determine the electromagnetic forces acting in a power transformer, when a current corresponding to the first peak of a three‐phase circuit flows in the…

Influence of the neutral in the thermal performance of a three‐phase induction motor under unbalanced power supply using the finite element approach

J.A.D. Pinto, A.P. Coimbra, C.L. Antunes, X.M.L. Fernández, M.P. Donsión

In this paper the influence of the neutral in the thermal performance of a three‐phase squirrel cage induction motor fed by asymmetrical supply voltages is studied and analysed. A…

Non‐destructive testing of layered structures using generalised radial basis function networks trained by the orthogonal least squares learning algorithm

I.T. Rekanos, T.V. Yioultsis, T.D. Tsiboukis

The evaluation of the conductivity profile of layered metallic structures is performed via the inversion of the impedance of a circular air cored probe coil of rectangular cross…

Measurement of near‐fields radiated by an induction heating power supply

Ozge Sahin

Induction coil and the extension cable of an induction heating power supply radiate electromagnetic noise and often give disturbance to other equipment and systems closely…

A new probe for eddy current testing of low conductivity materials

Ryszard Sikora, Mieczysl§aw Komorowski, Tomasz Chady

In the paper a new probe for eddy current testing of low conductivity materials is presented. The new probe has been applied for eddy current testing of H₂SO₄ water solution…

Ferromagnetic materials excited by a distorted periodic field source

P. Del Vecchio, A. Salvini, L. Carrarini, G.M. Veca

The aim of the authors is to discuss the magnetic behaviour of the ferromagnetic materials used in industrial applications, when the cited harmonic distortion of the excitation is…

Analytical approximation of the dependence of magnetic material properties on temperature

Z. Wl§odarski, J. Wl§odarska

Temperature dependence of magnetic susceptibility has been approximated by the extension of Curie‐Weiss law to ferromagnetic states. Application of similar relations to other…

Magneto‐thermo‐elastic vibration of thin shells under a surge current

Pawel§ Zimny

The mathematical model of thin cylindrical conducting shell deformation under a current surge was elaborated. The shell deformation influence on the electromagnetic and thermal…

Design of RLC circuit for pulse magnetizer of permanent magnets

Z. Zycki, K. Pawluk

The current pulse magnetizing process of permanent magnets is considered. General conditions for the design of a pulse magnetizer are given for the case when the magnetizing…