CARLOS ANTONIO FRANCA SARTORI
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Artigo IPEN-doc 28424 Analysis of the resonance phenomenon in unmatched power cables with the resonance surface response2021 - BADE, TAMIRIS G.; ROUDET, JAMES; GUICHON, JEAN-MICHEL; KUO-PENG, PATRICK; SARTORI, CARLOS A.F.Power converters are an essential part of modern power systems, giving flexibility to the power transportation and allowing the insertion of a wide range of different energy sources. One drawback of the converters is that the supraharmonic conducted emissions introduced by them can compromise the stability of these systems through electromagnetic interference (EMI). Electromagnetic compatibility (EMC) filters are used to prevent such problems. Nevertheless, these filters are designed to respect standards based on measurements in conditions considerably different from real applications. Particularly, if a converter is connected to electrically long cables its conducted emissions may be amplified by the resonance phenomenon. The method described in this paper allows the definition of a range for the filters input impedances where the conducted emissions in a long cable will not be amplified beyond established levels. In some cases the method allows the visualization of three-dimensional surfaces indicating the magnitude, frequency and position of the resonance phenomenon. In the general case these surfaces are defined on higher dimensions and can be analyzed with deterministic optimization algorithms. The originality of this paper resides in the generalized analysis of the resonance phenomenon, that it is based on frequency-dependent cable parameters and applies to unbalanced systems.Artigo IPEN-doc 25910 Modeling of a metamaterial in the FEA of a contactless transcutaneous energy transfer device2018 - CARVALHO, G.D.; SILVA, V.C.; HAFFNER, F.; SARTORI, C.A.F.; LEBENSZTAJN, L.; KRAHENBUHL, L.Metamaterials are difficult to deal with in computational electromagnetic modelling, e.g. finite element analysis. The reason is the prohibitive discretization refinement needed to account for their actual electromagnetic field distribution profile, within the frequency range used in contactless energy transfer devices. We propose an approach to simplify the modeling of a metamaterial in finite element simulations and present an analysis of its impact in the evaluation of the magnetic field distribution in the vicinity of the metamaterial.Artigo IPEN-doc 24716 A hybrid approach for assessments of equivalent emission sources and electromagnetic environments2018 - CARDIA, D.V.F.; SARTORI, C.A.F.; MUYLAERT, R.P.B.This paper presents a method for equivalent emission source determination by application of LLAs (Large Loop Antennas). A review of different types of LLAs is carried out and their characteristics regarding emission source evaluation are emphasized. A hybrid technic is applied for obtaining the electric fields based on previous measurement of magnetic fields combined with an analytical and numerical approach. This methodology is proposed as an alternative to face the constraints concerning to the near electric fields measurements and calculations.Artigo IPEN-doc 24245 Error analysis for near-field EMC problems based on multipolar expansion approach2017 - LI, Z.; TAVERNIER, F.; BREARD, A.; KRAHENBUHL, L.; VOYER, D.; SARTORI, C.A.F.Devices using power electronics are ubiquitous today and they are unfortunately intrinsic sources of electromagnetic interference. To address these electromagnetic compatibility problems at the initial design phase, a predictive method based on multipole expansion in spherical harmonics of the near field around each device was developed. To determine the basic expansions of a given source, a dedicated measurement bench has been designed. In this paper, some important issues of this approach and the measurement bench are studied, especially the error analysis on the measurements and the inverse problems. Some experimental results are also shown in the end.Artigo IPEN-doc 23037 Overview on the evolution of near magnetic field coupling prediction using equivalent multipole spherical harmonic sources2017 - BREARD, ARNAUD; CHADEBEC, OLIVIER N.; KRAHENBUHL, LAURENT F.; SARTORI, CARLOS A.F.; VOLLAIRE, CHRISTIAN; FABREGUE, OLIVIER; LI, ZHAO; MUYLAERT, RAFAEL P.B.; TAVERNIER, FRANCOIS; VOYER, DAMIENIn the electromagnetic compatibility behavior of power electronic converters, parasitic magnetic couplings between components are one of the main causes of dysfunctions or poor filtering. These couplings may be either conducted or near-field interferences. To handle interaction problems, full knowledge of these magnetic couplings is essential. This paper is an overview of the work on near magnetic field interference undertaken in the last 15 years by the International Maxwell Laboratory. This paper details a predictive method that accurately and efficiently calculates near magnetic field coupling between two sources. The method uses near-field multipolar expansion in spherical harmonics of electromagnetic sources to determine close magnetic coupling between two sources from their equivalent models. This paper also shows how theoretical developments of large loop antennas have evolved from the van Veen antenna, a model with only two degrees of freedom, to a more complex model in terms of degrees, order, and types of harmonics. In parallel, it describes developments in the measurement method that provides input to the theoretical model. To illustrate how the research has evolved, we discuss coupling between two complex sources to assess the accuracy of this predictive method.Resumo IPEN-doc 20614 Complete identification for near-field multipolar expansion of electromagnetic sources2014 - HOANG, THI Q.V.; BREARD, ARNAUD; VOLLAIRE, CHRISTIAN; KRAHENBUHL, LAURENT; SARTORI, CARLOS A.F.Artigo IPEN-doc 05803 Evaluation of electromagnetic environment around a structure during a lightning stroke1994 - SARTORI, C.A.F.; CARDOSO, J.R.Artigo IPEN-doc 05804 Evaluation of electromagnetic environemnt around a structure during a lightning stroke1994 - SARTORI, C.A.F.; CARDOSO, J.R.Artigo IPEN-doc 05801 Evaluation of electromagnetic environment around a structure during a lightning stroke1994 - SARTORI, C.A.F.; CARDOSO, J.R.Artigo IPEN-doc 05802 Evaluation of electromagnetic environment around a structure during a lightning stroke1994 - SARTORI, C.A.F.; CARDOSO, J.R.