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Amara Y.,CNRS Research Group of Electrotechnics and Automatics of Le Havre | Hlioui S.,Ecole Normale Superieure de Cachan | Hlioui S.,French National Conservatory of Arts and Crafts | Belfkira R.,Laboratoire Of Genie Electrique Of Paris Lgep | And 2 more authors.
IEEE Transactions on Vehicular Technology | Year: 2011

Double excitation synchronous machines combine permanent-magnet (PM) excitation with wound field excitation. The goal behind the principle of double excitation is to combine the advantages of PM-excited machines and wound field synchronous machines. These machines can constitute an energy-efficient solution for vehicle propulsion. This paper presents a comparison of the open circuit flux control capability of two structures of double excitation synchronous machines. First, a review of the state of the art of double excitation machines is presented. Then, the structures of these two machines are presented: one is a series double excitation synchronous machine and the other is a parallel double excitation synchronous machine. Finally, the open circuit flux control capabilities of both structures are compared. © 2011 IEEE.

Talj R.J.,University Paris - Sud | Hissel D.,CNRS Femto ST Institute | Ortega R.,Laboratoire des Signaux et Systemes L2S | Becherif M.,Laboratoire Systemes et Transports | And 2 more authors.
IEEE Transactions on Industrial Electronics | Year: 2010

Fuel cells are electrochemical devices that convert the chemical energy of a gaseous fuel directly into electricity. They are widely regarded as potential future stationary and mobile power sources. The response of a fuel-cell system depends on the air and hydrogen feed, flow and pressure regulation, and heat and water management. In this paper, the study is concentrated on the air subsystem that feeds the fuel-cell cathode with oxygen. Proceeding from a fourth-order model representing the air subsystem of a proton exchange membrane (PEM) fuel cell, a reduced third-order model is presented. Simulations show that the relative error caused by this reduction does not exceed 5%. Experimental validation has been done on a 33-kW PEM fuel cell, for both fourth- and reduced third-order models with less than 5% relative error. Additionally, a higher order sliding-mode supertwisting algorithm, with a well-known heuristic modification using variable gains, has been designed and validated experimentally to control a permanent-magnet synchronous motor that drives a volumetric compressor (double screw) designed to feed the 33-kW fuel cell with air. © 2006 IEEE.

Ouchetto O.,Laboratoire Of Recherche Et Innovation En Informatique Fsac | El Majd B.A.,Laboratoire Informatique | Essakhi B.,Astek | Zouhdi S.,Laboratoire Of Genie Electrique Of Paris Lgep
IEEE Transactions on Antennas and Propagation | Year: 2016

This paper presents a new and efficient method to compute the quasi-static homogenized constitutive parameters of biperiodic chiral artificial material. In this method, the studied domain is reduced to an elementary cell with pseudo-periodic conditions on the lateral sides and the local electromagnetic properties are computed by using the finite-element method. This chiral media is decomposed into two equivalent isotropic media and each one is treated separately. Indeed, the homogenized constitutive parameters of each isotropic media are expressed as a function of the macroscopic electromagnetic properties which are obtained by averaging the local electromagnetic properties. The homogenized constitutive parameters of the initial chiral material are expressed using the two equivalent isotropic materials. The validation of the numerical results is presented in the case of the lattices with 3-D inclusions. In addition, the obtained results are compared to existing results in literature. Finally, the incidence wave angle impact on the homogenized parameters is studied. © 1963-2012 IEEE.

Khene M.L.,University Mohamed Khider of Biskra | Alloui L.,University Mohamed Khider of Biskra | Alloui L.,Laboratoire Of Genie Electrique Of Paris Lgep | Bouillault F.,Laboratoire Of Genie Electrique Of Paris Lgep | And 3 more authors.
IEEE Transactions on Magnetics | Year: 2015

In this paper, numerical simulations of trapped field and temperature rise in a bulk superconductor during magnetization process are studied. The pulsed field magnetization method and the modified multi-pulse technique with stepwise cooling are presented. We adopt the control volume method for solving the thermomagnetic system describing the physical phenomena. The electromagnetic fields and temperature are computed because of an explicit algorithm. The results are compared with published experimental results and show a good concordance. © 2015 IEEE.

Le Bihan Y.,Laboratoire Of Genie Electrique Of Paris Lgep | Marchand C.,Laboratoire Of Genie Electrique Of Paris Lgep | Pavo J.,Budapest University of Technology and Economics | Krebs G.,Laboratoire Of Genie Electrique Of Paris Lgep
Digests of the 2010 14th Biennial IEEE Conference on Electromagnetic Field Computation, CEFC 2010 | Year: 2010

Partial least square regression is applied for the processing of eddy current testing data used for the reconstruction of the shape parameters of cracks. The procedure is applied for cracks having very small spatial extensions. It is found that the reconstruction of the area of such cracks is considerably more robust than the reconstruction of their length and depth parameters. © 2010 IEEE.

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