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Clavel E.,Grenoble Institute of Technology | Tran T.-S.,Hanoi University | Aime J.,CEDRAT | Meunier G.,Grenoble Institute of Technology | Roudet J.,Grenoble Institute of Technology
Electronics | Year: 2013

Regarding standards, it is well established that common mode currents are themain source of far field emitted by variable frequency drive (VFD)-cable-motorassociations. These currents are generated by the combination of floating potentials withstray capacitances between these floating potential tracks and the mechanical partsconnected to the earth (the heatsink or cables are usual examples). Nowadays, due tofrequency and power increases, the systematic compliance to EMC (ElectroMagneticCompatibility) becomes increasingly difficult and costly for industrials. As a consequence,there is a well-identified need to investigate practical and low cost solutions to reduce theradiated fields of VFD-cable-motor associations. A well-adapted solution is the shielding ofwound components well known as the major source of near magnetic field. However, thissolution is not convenient, it is expensive and may not be efficient regarding far fieldreduction. Optimizing the components placement could be a better and cheaper solution.As a consequence, dedicated tools have to be developed to efficiently investigate not easycomprehendible phenomena and finally to control EMC disturbances using componentplacement, layout geometry, shielding design if needed. However, none of the modelingmethods usually used in industry complies with large frequency range and far field modelsincluding magnetic materials, multilayer PCBs, and shielding. The contribution of thispaper is to show that alternatives regarding modeling solutions exist and can be used to getin-deep analysis of such complex structures. It is shown in this paper that near fieldinvestigations can give information on far field behavior. It is illustrated by aninvestigation of near field interactions and shielding influence using a FE-PEEC hybridmethod. The test case combining a common mode filter with the floating potentials tracksof an inverter is based on an industrial and commercialized VFD. The near fieldinteractions between the common mode inductance and the tracks with floating potentialsare revealed. Then, the influence of the common mode inductance shielding is analyzed. © 2013 by the authors; licensee MDPI, Basel, Switzerland.

Meunier G.,CNRS Grenoble Electrical Engineering Lab | Charmoille V.,CNRS Grenoble Electrical Engineering Lab | Guerin C.,CEDRAT | Labie P.,CNRS Grenoble Electrical Engineering Lab | Marechal Y.,CNRS Grenoble Electrical Engineering Lab
IEEE Transactions on Magnetics | Year: 2010

This paper proposes a general finite element approach for the frequency-domain homogenization of electromagnetic periodical structures. Based on local finite element resolutions on a cell, the method allows taking into account the local effects at the macroscopic level through the determination of equivalent macroscopic permeability and conductivity laws. Examples of the modeling of eddy current losses in windings are presented. © 2006 IEEE.

Ennassiri H.,University of Le Havre | Dhifli M.,University of Le Havre | Chabour F.,University of Le Havre | Barakat G.,University of Le Havre | And 2 more authors.
2016 11th International Conference on Ecological Vehicles and Renewable Energies, EVER 2016 | Year: 2016

The aim of this paper is to compare two approaches for modelling the vibro-acoustic behaviour of a three-phase discoïdal switching flux permanent-magnet machine (DSFPM) due to electromagnetic origins. The first approach is based on a full transient vibro-acoustic analysis of the DSFPM emitted acoustic noise. The second modelling approach is based on a modal superposition analysis of the DSFPM vibro-acoustic behaviour. This multi-physic study is based on a weak coupling between two 3D Finite-Element (FE) models: an electromagnetic model computing the magnetic pressure and a vibroacoustic model to quantify the vibration/noise performances. Results comparison between the two modelling approaches shows the effectiveness of the modal superposition model in terms of precision and computation time. © 2016 IEEE.

Rondot L.,CEDRAT | Mazauric V.G.,Schneider Electric | Wendling P.F.,Magsoft Corporation
IEEE Transactions on Magnetics | Year: 2010

In order to improve the finite element modeling of macroscopic eddy currents, a quadratic energy-based error criterion is obtained from a thermodynamic description of electromagnetism. Attention is first paid on the analytical derivation of the criterion in a general sense-i.e. without any assumption about the potential formulation and including possible body motion-especially to validate its relevance in 2D or 3D and to stress its independence from the formulation or the kind of application. Preliminary validation is given on a Thomson's effect device: As expected, the state functions provide the global convergence of the calculation within an iterative procedure whereas the conservation of the electromagnetic power is assessed locally to highlight the ill-checked elements. © 2006 IEEE.

Shi X.,CGCL | Pazat J.-L.,INSA Rennes | Rodriguez E.,CEDRAT | Jin H.,CGCL | Jiang H.,Huazhong University of Science and Technology
Future Generation Computer Systems | Year: 2010

Grid applications have been prone to encountering problems such as failures or malicious attacks during execution in recent years, due to their distributed and large-scale features. The application itself, however, has limited power to address these problems. This paper presents the design, implementation, and evaluation of an adaptive framework- Dynasa, which strives to handle security problems using adaptive fault-tolerance (i.e., checkpointing and replication) during the execution of applications according to the status of the Grid environments. We evaluate our adaptive framework experimentally using the Grid5000 testbed and the experimental results have demonstrated that Dynasa enables the application itself to handle the security problems efficiently. The starting of the adaptive component is less than 1 s and the adaptive action is less than 0.1 s with the checkpoint interval of 20 s. Compared with non-adaptive method, experimental results demonstrate that Dynasa achieves better performance in terms of execution time, network bandwidth consumed, and CPU load, resulting in up to a 50% lower overhead. © 2009 Elsevier B.V. All rights reserved.

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