ABSTRACT This work introduces a combined model that integrates linear state‐space with Koopman‐type machine‐learning to efficiently predict the dynamics of nonlinear, high‐dimensional, and field‐circuit coupled systems, as encountered in areas such electromagnetic compatibility, power electronics, electric machines. Using an extended nonintrusive combination algorithm, proposed achieves high accuracy error approximately 1%, outperforming baselines: purely data‐driven model. Moreover, it...

In this paper, we propose a new approach to solve the magnetostatic inverse problem. The goal of work is, from measurements magnetic field in air, rebuild model for magnetization ferromagnetic shell structure. It's then possible calculate where sensors cannot be placed. This problem is usually ill posed or rank-deficient, it's necessary use mathematical regularizations. These techniques are based upon injection knowledge about behavior solution. We preferred add physical information....

This paper presents an adapted partial element equivalent circuit (PEEC)-based methodology applied to the modeling of interconnections power electronics devices. Although this method is already well known, originality work its use model a device presenting industrial complexity. To make possible modeling, two integral methods, based on different meshings, are presented. They dedicated respectively computation parasitic inductances and capacitances lead system. From time-domain simulation...

This paper presents a new method to estimate the residual flux in magnetic circuit of transformer, which is key data determine ideal closing time for re-energization transformer. The methodology described based on measurement with fluxgate sensors field induced by leakage around single-phase

A fast and general partial element equivalent circuit (PEEC) method based on the Fourier transform (FFT) is proposed for first time. The numerical tool only requires common CAD data input files (e.g., <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$.\text{stl}$</tex-math></inline-formula> format), then discretization process performed automatically by means of a voxelization technique ray intersection,...

This paper presents a new non invasive technique for fuel cell diagnosis. The method relies on the measurements of magnetic field signature generated by working cell. Knowing relationship between currents and field, it is possible to estimate current density solving an inverse problem. problem being ill-posed, original sensors basis are proposed improve reconstruction process. experimental set-up remains simple, based few fixed shows good efficiency.

A volume integral formulation to compute eddy currents in nonmagnetic conductive media is presented. The current distribution approximated with facet finite elements. general and leads an equivalent lumped elements circuit. To ensure the solenoidality of distribution, algorithm detecting independent loops then used for resolution. tested on TEAM workshop Problem 7. Even coarse meshes, its accuracy demonstrated.

A new integral formulation is presented, enabling the computation of resistive, inductive, and capacitive effects considering both conductors dielectrics in frequency domain.The considered application allows us to neglect any propagation magnetic materials.In this paper, we will show how improve unstructured-partial element equivalent circuit approach consider dielectric materials, keeping same benefits.Results obtained with are compared results from an industrial finite-element method...

This paper shows the reliability of fault detection on electrical machines by analysis low frequency magnetic stray field. It is based our own experience about discretion naval propulsion machine. We try to apply techniques developed in previous works subject faults detection. In this we focus rotor defaults a synchronous generator (eccentricity and short-circuit rotor). Two kinds study are performed. The first one numerical. Firstly, an adapted finite elements method used compute field...

Our goal is to identify sheet steel magnetization with near field measurements. Indeed, direct calculation of the whole impossible because remanent part nondeterminist. Consequently, our strategy obtain a magnetostatic formulation able compute magnetic as close possible and which adapted solve an inverse problem. In this paper, scalar potential integral introduced compared formulation. We are especially interested in anomaly created by ferromagnetic ships.

An analytical method for the calculation of magnetostatic scalar potential and magnetic field created by a polyhedron-shaped permanent magnet is presented in this paper. The supposed to be uniformly magnetized. magnetization equivalent distributions charges: it coulombian approach. made surface integration on all polygons that composes polyhedron. For each polygonal surface, we have shown can decomposed series right triangles. solution particular case triangle has been developed. By way, any...

This paper presents a novel and useful 3-D nonlinear magnetostatic integral formulation for volume method. Like every other formulation, its main advantage is that it does not require air-region mesh, only ferromagnetic regions being discretized. The based on magnetic flux density interpolation facet elements. Special care taken to accurately compute the singularity of Green's kernel. application an equivalent circuit approach allows preserving solenoidality induction. It shown very accurate...

An extension of the unstructured partial element equivalent circuit (PEEC) method to magnetic media is proposed. Linear inhomogeneous conductive, dielectric, and are considered. By formulating PEEC in terms div-free currents, an efficient algorithm based on independent loop search or basis reduction scheme can be used solve electromagnetic problem. In such a way, limited number unknowns non-simply connected domains treated as well. The formulation validated real integrated inductor,...

The model order reduction techniques based on the multipoint projection Krylov methods have become of choice to generate large macromodels multiport RLC circuits. A well-known difficulty with such lies in need for clever point selection attain compactness and accuracy. In this paper, we present an automatic methodology optimizing sample selection. This method is general, suitable circuits obtained by partial element equivalent circuit coupled adaptive multilevel fast multipole method. Our...

This paper presents an original approach for determining the unknown magnetization of a ferromagnetic shell. Magnetic measurements using sensors close from device under test are used to rebuild distributions located on These representative and tangential moments or charges can be used. identification problem is particular case inverse generally ill posed. Instead classical mathematical tools solve such problem, we preferred change it in better posed one by adding our physical knowledge...

This paper focuses on proximity losses prediction in conductors of power electronics transformers. The method is based the concept equivalent complex permeability applied to rectangular conductors. A 1-D analytical model analyzed. It has been shown that does not take into account edge effects. Two complementary approaches have proposed. One treats scattered conductors; other deals with package Both are compared a good accuracy and economic computation time

come from teaching and research institutions in France or abroad, public private centers.L'archive ouverte pluridisciplinaire

In order to compute eddy current distributions in thin conductive nonmagnetic shells, a new integral formulation is proposed. The method based on surface impedance condition which takes into account the field variation through depth due skin effect. It general and enables modeling of various problems whatever their skin-depth avoiding meshing air region.

An integral method using the magnetic scalar potential to solve nonlinear magnetostatic problems is developed. This uses range interactions between magnetizable elements and it particularly well suited compute field in air domain which do not need be meshed. The collocation Galerkin approaches are presented compared equation. Both methods construction of full interaction matrices may computed with analytical formulae. A Newton-Raphson method, matrix must built at each solver iteration, used...

This paper deals with the modeling of eddy currents generated by arc motion during opening phases low voltage circuit breakers. Two kinds are tested. While first one consists in determining splitter plates, second is devoted to calculation electrodes. All simulations carried out a T-/spl Phi/ finite-element method formulation and no new mesh at each time step required.

In order to improve the finite-element modeling of macroscopic eddy currents (associated with motion and/or a time-varying electrical excitation), an original error criterion for adaptive meshing, based on local power conservation, is proposed. Then, importance element in computation investigated. Finally, coupled ldquobubblerdquo mesh generator, and meshing 2D induction heating case performed.

This paper presents an application of the method moments (MoM), to compute parasitic capacitances a power electronics layout. By coupling these resistive and inductive equivalent circuit obtained thanks partial element (PEEC) method, complete electrical made lumped elements is obtained. Its simulation by means SPICE-like tool enables evaluation EMC efficiency structure. applied boost converter results numerical (MoM finite - FEM) are compared measurements. Finally, radiated investigations presented