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Beghou L.,Laboratoire des Systemes et Applications Pour lInformation et lEnergie | Costa F.,Ecole Normale Superieure de Cachan | Pichon L.,Laboratoire Of Genie Electrique Of Paris
IEEE Transactions on Electromagnetic Compatibility | Year: 2015

This paper presents a detailed study about the characterization of electromagnetic near-fields emitted from power electronic circuits. The approach proposed here provides a radiation model, which verifies the uniqueness of the solution using an inverse problem-based resolution method. For this purpose, the characterization method has been combined with an experimental mapping realized at the switching time scale. This mapping is based on a Fourier analysis applied on the measurements acquired from the device under study. It allowed us to trace a prior radiations map over the device under study. This radiation map is then exploited in order to validate the uniqueness of the final result, a result that has been obtained by solving the inverse problem using a genetic algorithm (GA) to optimize the highly nonlinear fitness function. The precision and the accuracy of the method have been validated by the superposition of the obtained radiation models over the circuit topology. The correlation between the sources parameters (position, orientation, geometrical parameters and currents) and the parameters corresponding to the components located at the regions defined by the radiation map has been successfully performed. This allowed us to confirm that the physical reality is respected, and to assume that we have reached the uniqueness of the solution. © 1964-2012 IEEE. Source


Boisson J.,Ecole Normale Superieure de Cachan | Louf F.,Ecole Normale Superieure de Cachan | Ojeda J.,Ecole Normale Superieure de Cachan | Mininger X.,Laboratoire Of Genie Electrique Of Paris | Gabsi M.,Ecole Normale Superieure de Cachan
IEEE Transactions on Industrial Electronics | Year: 2014

This paper presents an analytical approach for the determination of the mechanical eigenfrequencies of an electrical machine stator. This model is based on the calculation and the minimization of Rayleigh's quotient. It uses an energetic approach from beam theory applied to stators with a Timoshenko kinematic model. This model is very specially adapted for stators with a thick yoke as the high-speed machines. This approach is validated by finite-element simulations and experimental measurements. © 1982-2012 IEEE. Source


Raisemche A.,Paris School of Engineering | Boukhnifer M.,Paris School of Engineering | Larouci C.,Paris School of Engineering | Diallo D.,Laboratoire Of Genie Electrique Of Paris
IEEE Transactions on Vehicular Technology | Year: 2014

In this paper, two active fault-tolerant control (AFTC) schemes dedicated to induction-motor drives in electric or hybrid vehicle powertrains are presented and compared. Fault detection and mitigation are merged to propose a robust algorithm against speed-sensor faults (fault is modeled as significant additional noise or an exponential type emulating a bias) leading to uncertainties in the measurement. The first architecture is a hybrid fault tolerant-control (FTC) with proportional-integral and H\infty controllers; the second architecture is the generalized internal model control (GIMC) with a natural reconfiguration. Both are built to ensure resilience while keeping good dynamic performances. For each architecture, the speed-sensor fault detection is based on an extended Kalman filter (EKF) that generates a residual vector. The correction method is calculated differently for the two schemes specifically in the switching transition phase between the nominal and robust controllers. A comparative study is carried out between the two FTC schemes. © 2013 IEEE. Source


Kameni A.,University of Liege | Kameni A.,Laboratoire Of Genie Electrique Of Paris | Lambrechts J.,Catholic University of Louvain | Remacle J.-F.,Catholic University of Louvain | And 3 more authors.
IEEE Transactions on Magnetics | Year: 2012

A discontinuous Galerkin method is proposed for computing the current density in superconductors characterized by a constitutive power law between the current density and the electric field. The method is formulated to solve the nonlinear diffusion problem satisfied by the electric field, both in the scalar and 2-D vectorial case. Application examples are given for a superconducting cylinder subjected to an external magnetic field. Results are compared to those given by the mixed finite-element/finite-volume method and those obtained using a standard finite-element software. Efficiency and robustness of the approach are illustrated on an example where the exponent in the power law is spatially dependent. © 2012 IEEE. Source


Journeaux A.A.,Laboratoire Of Genie Electrique Of Paris | Bouillault F.,Laboratoire Of Genie Electrique Of Paris | Roger J.Y.,Electricite de France
IEEE Transactions on Magnetics | Year: 2014

Mesh-to-mesh data transfer methods are evaluated in terms of not only accuracy but also the cost of computing time. Interpolation is a widely used method because of its simplicity. However, it suffers from a lack of precision when Lagrange elements are considered. Projection methods, which are more complex, are thus preferred, although they significantly increase the computational time as well as the memory cost. We propose a comparison between these two methods (interpolation and projection) applied to curl-conforming and div-conforming elements. It appears that interpolation is advantageous because of its simplicity and speed while giving results of the same order as the projection method. A process to accurately compute circulations along edges and fluxes through faces is proposed. It relies on an adaptive quadrature scheme which provides reliable results regardless of the variation of the initial solution. © 2014 IEEE. Source

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