A modified Jiles-Atherton model presenting the magnetic induction as an independent variable is proposed in order to be directly used time-stepping finite-element calculations applied vector potential formulation. This implemented field calculation procedure by introducing a differential reluctivity. The calculated results are validated experiences performed Epstein's frame.

Different methods are presented for the calculation of torque as a function rotation angle in an electrical machine. These integrated code by using finite element method. The movement is taken into account means moving band technique, involving quadrilateral elements airgap. calculated during displacement part following methods: Maxwell stress tensor, coenergy derivation, Coulomb's virtual work, A. Arkkio's method (1988), and magnetizing current results obtained different compared with...

This paper analyzes a 90-kW brushless doubly fed three-phase induction machine in which wound rotor circuit is connected to rotary transformer. It presents the advantages of substituting brushes and slip rings by In addition, it shows transformer design operation. The steady-state model considers electrical techniques provide information about current, power factor, efficiency on load. Equivalent parameters are obtained through laboratory tests under prototype. Comparisons between simulation...

In this paper, we present a new vector hysteresis model, which is derived from the original Jiles-Atherton scalar one. The model presents magnetic induction as independent variable. A modified Langevin equation used to represent anhysteretic magnetization, and some aspects are discussed. comparison between measured calculated curves for an anisotropic soft material performed validate model.

The parameters set of the Jiles-Atherton hysteresis model is identified by using a real coded genetic algorithm. identification performed minimizing mean squared error between experimental and simulated magnetic field curves. procedure validated comparing results.

A method is developed to take the eddy currents in lamination stacks into account with finite-element using three-dimensional (3-D) magnetic vector potential magnetodynamic formulation. It consists converting stacked laminations continuums which terms are associated for considering eddy-current loops produced by both parallel and perpendicular fluxes. Two levels of accuracy proposed. The best one based on an accurate analytical expression makes adapted a wide-frequency range, i.e., even low...

The single phase equivalent circuit is largely used to model the three-phase induction motors in steady-state operation and under sinusoidal balanced voltages. Depending on desired application, may or not represent core losses, a double cage even variation of parameters due skin effect saturation. However, determination through standard methods, such as those described IEEE Standard 112, be possible many situations given lack necessary resources. This paper presents initially survey from...

This paper deals with the study of static and dynamic rotor eccentricities a synchronous generator using 3-D FEM. First, both eccentricity cases are introduced, as well used approach. Then models structure, based on magnetic scalar potential formulation vector formulation, presented. Two modeling methods 2-D eccentricity. Results obtained for magnetostatic magnetodynamic related to defects their combination presented discussed.

A methodology to evaluate hysteresis losses in iron sheets under dc-biased inductions is presented this work. Based on several experimental investigations of six different used the fabrication electrical machines, an improvement classical Steinmetz equation proposed. This technique can be easily employed and may helpful for machine designers.

This paper deals with the incorporation of a vector hysteresis model in 2D finite‐element (FE) magnetic field calculations. A previously proposed extension well‐known scalar Jiles‐Atherton is considered. The vectorised shown to have same advantages as one: limited number parameters (which value both models) and ease implementation. classical potential FE formulation adopted. Particular attention paid resolution nonlinear equations by means Newton‐Raphson method. It that application latter...

Purpose Although the original Jiles‐Atherton (J‐A) hysteresis model is able to represent a wide range of major loops, in particular those soft magnetic materials, it can produces non‐physical minor loops with its classical equations. The purpose this paper show modification J‐A order improve and inner representation. proposed technique allows representing non‐centred accuracy as well improving symmetric Design/methodology/approach Only irreversible magnetization component slightly modified...

Thermal analysis is an important step in designing induction motors. Its principles require the calculation of induced currents rotors and obviously this phenomenon connected to heating. Currents circulating stator coil also heats machine. In work, order evaluate thermal behaviour machine, a weak coupled modeling between electrical phenomena proposed, taking into account transient states. Also, work we introduce new approach take airgap zone for analysis. Experimental results are presented...

An optimization procedure to obtain the parameters of both original Jiles-Atherton and inverse hysteresis models is presented in this paper. Doing so, minor loops can be conveniently simulated without inserting scaling methods. The comparison between experimental calculation results validates procedure.

The treatment of massive and stranded inductors is studied in the frame dual magnetodynamic finite element h- /spl alpha/-formulations. On both sides, edge elements are used source fields defined when needed as mathematical tools to be directly each formulation lead circuit relations for inductors. Simplified expressions proposed. accuracy obtained on local solutions parameters pointed out.

Iron losses in electrical machines are evaluated and analyzed this work using the time-stepping finite elements method. The three components of total losses, i.e., eddy currents, excess or anomalous hysteresis considered. Concerning influence minor loops In order to compute changes flux densities during excursions around these loops, "rain-flow method" is used. Results on several typical presented discussed.

A method for determining the supply current waveshapes torque ripple compensation in permanent-magnet motors without saliency and damping bars, by means of a finite-element code, is presented. First, theoretical analysis shows that producing constant can be determined. This leads to an expression as function motor EMF (electromotive force) cogging torque. Several methods, based on computation magnetic field, computing are proposed compared. special experimental bench measurement used...

In this work an approach for modeling a transformer core taking into account magnetic hysteresis is presented. For purpose, the inverse vector Jiles-Atherton model incorporated in 2D finite element code. This allows writing naturally differential reluctivity tensor which can be directly used field equations. A three-phase modeled. The excitation characteristics of transformer, as well loops at specific points, are proposed was verified with obtained experimental data.

This paper presents a 2-D finite-element model to analyze the iron losses in three-phase transformer. In this model, effects of nonlinear core behavior are taken into account by means vector hysteresis incorporated formulation using magnetic differential reluctivity tensor. The tensor emerges naturally from vectorized Jiles–Atherton model. complete includes eddy current and anomalous losses. magnetization currents calculated compared with measured ones. Calculations loops at spotted points...

In this paper, the authors deal with finite-element (FE) modeling of eddy-current effects in form-wound windings electrical machines using a previously proposed general frequency- and time-domain homogenization method. By way demonstration validation, real-life 1250-kW induction machine double-layer stator winding is considered. The skin proximity one conductor (copper bar) are first quantified by means simple low-cost FE model, leading to complex frequency-dependent coefficients for...

This paper presents numerical procedures for the treatment of tensors related to vector Jiles-Atherton (JA) model applied finite element method (FEM). The is based on 3-D differential permeability formulation. A more precise calculation implies determination off-diagonal terms tensor parameters. main goal verify if such a change improves convergence stability coupled with FEM and use JA yields accurate hysteresis representation. We present results comparing experimental data Testing...