Search

Your search keyword '"Lécrivain, Michel"' showing total 11 results
Start Over Author "Lécrivain, Michel" Search Limiters Full Text
11 results on '"Lécrivain, Michel"'

1. Partially ferromagnetic electromagnet for trapping and cooling neutral atoms to quantum degeneracy

Author

Fauquembergue, Marie, Riou, Jean-Félix, Guerin, William, Rangwala, Sadiq, Moron, Frédéric, Villing, André, Coq, Yann Le, Lécrivain, Michel, Bouyer, Philippe, and Aspect, Alain

Subjects
Condensed Matter - Other Condensed Matter
Abstract

We have developed a compact partially ferromagnetic electromagnet to produce a Ioffe-Pritchard trap for neutral atoms. Our structure permits strong magnetic confinement with low power consumption. Compared to the previous iron-core electromagnet, it allows for easy compensation of remnant fields and very high stability, along with cost-effective realization and compactness. We describe and characterize our apparatus and demonstrate trapping and cooling of Rb 87 atoms to quantum degeneracy. Pure Bose-Einstein condensates containing 10^6 atoms are routinely realized on a half-minute cycle. In addition we test the stability of the magnetic trap by producing atom lasers.

Published
2005
Full Text
View/download PDF

2. An Hybrid-Excited Flux-Switching Machine for High Speed DC-Alternator Applications

Author

Gaussens, Benjamin, Hoang, Emmanuel, Manfe, P., Lécrivain, Michel, Gabsi, Mohamed, Systèmes et Applications des Technologies de l'Information et de l'Energie (SATIE), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École normale supérieure - Rennes (ENS Rennes)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS), Leroy Somer (Leroy Somer), Leroy Somer, Laboratoire d'Electricité des Signaux et de Robotique (LESIR), École normale supérieure - Cachan (ENS Cachan)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), and Gaussens, Benjamin

Subjects
[SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, [SPI.ELEC] Engineering Sciences [physics]/Electromagnetism
Abstract

International audience; This paper presents a new topology of Hybrid Excited Flux-Switching Machine (HE FSM) with excitation coils located in stator slots (or inner DC windings). After describing the three phase structure to be investigated, the working principle is discussed and main electromagnetic performances are simulated by Finite Element (FE) Analysis. It is demonstrated that the airgap field can be easily controlled which is interesting for variablespeed applications. Finally, a prototype having 12 stator poles and different rotor teeth number (10 or 14) was built. Experiments were performed validating FE simulations and the operation principle. Finally, the thermal behavior of the prototype machine is investigated through experiments. It is shown that up to 12000rpm, the thermal stabilization is achieved, making this topology an excellent candidate for high-speed applications.

Published
2013

3. Magnetic Field Solution in Doubly-Slotted Airgap of Conventional and Alternate Field-Excited Switched-Flux Topologies

Author

Gaussens, Benjamin, Hoang, Emmanuel, de La Barrière, Olivier, Saint Michel, J., Lécrivain, Michel, Gabsi, Mohamed, Systèmes et Applications des Technologies de l'Information et de l'Energie (SATIE), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École normale supérieure - Rennes (ENS Rennes)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS), Matériaux Magnétiques pour l'Energie (SATIE-MME), Composants et Systèmes pour l'Energie Electrique (CSEE), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École normale supérieure - Rennes (ENS Rennes)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS)-Systèmes et Applications des Technologies de l'Information et de l'Energie (SATIE), Leroy Somer (Leroy Somer), Leroy Somer, Laboratoire d'Electricité des Signaux et de Robotique (LESIR), École normale supérieure - Cachan (ENS Cachan)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), and Gaussens, Benjamin

Subjects
[SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, [SPI.ELEC] Engineering Sciences [physics]/Electromagnetism
Abstract

International audience; A general solution of the magnetic field in the airgap of Conventional and Alternate Field-Excited Switched-Flux (FE-SF) machines is proposed in this paper. The analytical model is based on subdomain method. It involves solution of governing field equations in a doubly-slotted airgap using the variable separation method. The complete model is derived and described in a general manner so that it can be easily extended to unconventional FE-SF topologies. By means of example, analytical predictions of airgap field are extensively compared and validated using 2D FE results. FE simulations were performed on a 24-10 classical FE-SF structure and also, on a novel 18-11 FE-SF machine with additional spacer teeth.

Published
2013

4. A New Method of Current Density Distribution for Switched Reluctance Machine to Increase Average output Torque

Author

Li, Guangjin, Ojeda, Javier, Hoang, Emmanuel, Lécrivain, Michel, Gabsi, Mohamed, Systèmes d'Energie pour les Transports et l'Environnement (SATIE SETE), Composants et Systèmes pour l'Energie Electrique (CSEE), Systèmes et Applications des Technologies de l'Information et de l'Energie (SATIE), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École normale supérieure - Rennes (ENS Rennes)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École normale supérieure - Rennes (ENS Rennes)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS)-Systèmes et Applications des Technologies de l'Information et de l'Energie (SATIE), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS), Sefora, and Li, Guangjin

Subjects
[SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Finite Element Model, [SPI.ELEC] Engineering Sciences [physics]/Electromagnetism, [SPI.NRJ]Engineering Sciences [physics]/Electric power, Switching Reluctance Machine, average torque, flux in air-gap, torque ripple, self and mutual-inductance, [SPI.NRJ] Engineering Sciences [physics]/Electric power
Abstract

International audience; The electromagnetic performances for two current distribution methods (classical and non-classical) of a 3-phase, 24 stator slots and 16 rotor poles Switching Reluctance Machine (SRM) were compared. The three phases were excited in sinusoidal current mode. The Finite Element Model was used to predict the average torque, the total flux of each phase, the torque ripple, the self and the mutual-inductance of each phase. After the computation, it is shown that the machine with non-classical current distribution has more average torque than the machine with classical current distribution, especially at high current density. Experimental tests have been realized, and a good agreement between the experimental and numerical (FE) results was observed.

Published
2009

5. EXPERIMENTAL COMPARISON OF LAMINATION MATERIAL CASE OF SWITCHING FLUX SYNCHRONOUS MACHINE WITH HYBRID EXCITATION

Author

Hoang, Emmanuel, Hlioui, Sami, Lécrivain, Michel, Gabsi, Mohamed, Hoang, Emmanuel, Systèmes d'Energie pour les Transports et l'Environnement (SATIE SETE), Composants et Systèmes pour l'Energie Electrique (CSEE), Systèmes et Applications des Technologies de l'Information et de l'Energie (SATIE), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École normale supérieure - Rennes (ENS Rennes)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École normale supérieure - Rennes (ENS Rennes)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS)-Systèmes et Applications des Technologies de l'Information et de l'Energie (SATIE), and Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Synchronous machine, [SPI.NRJ]Engineering Sciences [physics]/Electric power, flux weakening, permanent magnet, flux switching, hybrid excitation, magnetic losses, [SPI.NRJ] Engineering Sciences [physics]/Electric power
Abstract

International audience; The aim of this paper is to compare the experimental performances of a new hybrid flux switching synchronous machine built with two types of lamination materials (3% silicon iron steel M330-50 and NO-20). This machine uses the flux switching principle where all the active parts are located on the stator (armature windings and permanent magnets). However DC excitation coils where added in the stator and gives a supplementary degree of freedom used control the total excitation flux. The rotor is only a salient passive rotor and can be robust and made with a low cost technology. This new machine can be supplied by means of a traditional three-phase voltage converter or can be associated with a diode rectifier.

Published
2009

6. Dimensionnement et comparaison de machines synchrones à concentration de flux à encochage fractionnaire pour une application véhicule hybride

Author

Nguyen, Phi Hung, Hoang, Emmanuel, Gabsi, Mohamed, Lécrivain, Michel, Nguyen, Phi-Hung, Systèmes et Applications des Technologies de l'Information et de l'Energie (SATIE), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École normale supérieure - Rennes (ENS Rennes)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS), and PREDIT M2EI

Subjects
cycle de fonctionnement, concentration de flux, véhicule hybride, [SPI.NRJ]Engineering Sciences [physics]/Electric power, Machine synchrone à aimants permanents, encochage fractionnaire, [SPI.NRJ] Engineering Sciences [physics]/Electric power
Abstract

8 pages; Deux machines synchrones à aimants permanents et à concentration de flux sont présentées dans cet article. Ce sont deux machines à bobinages concentrés au stator et à encochage fractionnaire avec des aimants enterrés au rotor. Nous présentons premièrement la structure, la comparaison en terme du couple et puis le dimensionnement systémique de ces deux machines dans l'objectif d'obtenir le rapport couple/pertes cuivre maximal. Enfin, nous présentons le calcul des pertes moyennes pour un cycle de fonctionnement du véhicule hybride.

Published
2009

7. Modelling, Analysis of Parameters and Tests of a Small Electronically Commutated Single-Phase Permanent-Magnet Reluctance Motor

Author

Soulard, Juliette, Multon, Bernard, Lucidarme, Jean, Lécrivain, Michel, Prevond, Laurent, Multon, Bernard, Laboratoire d'Electricité des Signaux et de Robotique (LESIR), École normale supérieure - Cachan (ENS Cachan)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Systèmes d'Energie pour les Transports et l'Environnement (SATIE SETE), Composants et Systèmes pour l'Energie Electrique (CSEE), Systèmes et Applications des Technologies de l'Information et de l'Energie (SATIE), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École normale supérieure - Rennes (ENS Rennes)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École normale supérieure - Rennes (ENS Rennes)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS)-Systèmes et Applications des Technologies de l'Information et de l'Energie (SATIE), and Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI.NRJ]Engineering Sciences [physics]/Electric power, Analytical magnetic model, Finite element analysis, Small permanent magnet reluctance motor, Single phase motor, [SPI.NRJ] Engineering Sciences [physics]/Electric power
Abstract

International audience; The aim of this study is to evaluate the field flux in a small electronically commutated single-phase permanent magnet reluctance motor. Its structure is inherently three-dimensional. An analytical model is built so that an analysis of parameters can be easily conducted. With a first simple model, an optimum is found for the magnets' length that may permit to use disk-magnet technology. Yet, the value of the field flux lacks accuracy. In order to locate the main leakage fluxes, the finite element analysis is used on a bidimensional equivalent geometry. A second and satisfying analytical model is determined. Experimental results confirm the effectiveness of the model to fulfil analysis of parameters.

Published
1996

9. Piezoelectric Actuator Design and Placement for Switched Reluctance Motors Active Damping.

Author

Xavier Ojed, Mininger, Xavier, Ahmed, Hamid Ben, Gubsi, Mohamed, and Lécrivain, Michel

Subjects
PIEZOELECTRIC devices, ACTUATORS, GENETIC algorithms, SEPARATION (Technology), COMPUTER programming, ENGINES, AUTOMOBILE engines, MACHINE translating, COMPUTER algorithms
Abstract

This paper describes the design and the placement of piezoelectric actuators on switched reluctance motors by means of a genetic algorithm (nondominated sorting genetic algorithm II) for the purpose of reducing stator vibrations. Two distinct approaches are presented: one energy-related and the other based on a minimization of the resultant displacement. These methods lead to design and placement strategy for the piezoelectric actuators. A number of optimal actuators obtained using these kinds of approaches is also compared with mechanical finite-element simulations. At last, a solution is achieved in order to validate optimal placement using positive position feedback active filtering. [ABSTRACT FROM AUTHOR]

Published
2009
Full Text
View/download PDF

10. Hybrid Excitation Synchronous Machines: Energy-Efficient Solution for Vehicles Propulsion.

Author

Amara, Yacine, Vido, Lionel, Gabsi, Mohamed, Hoang, Emmanuel, Ahmed, A. Hamid Ben, and Lécrivain, Michel

Subjects
EXCITATION systems in electric machinery, ELECTRONIC excitation, PROPULSION systems, TRACTION drives, ENERGY consumption, ELECTROMECHANICAL devices, ELECTRIC machines
Abstract

In this paper, the suitability of a class of electric machines for vehicle traction applications is discussed. These machines, which are known as hybrid excitation synchronous machines, combine permanent-magnet (PM) excitation with wound field excitation. The goal behind the principle of hybrid excitation is to combine the advantages of PM excited machines and wound field synchronous machines. It is shown that these machines have good flux weakening capability compared with PM machines, and that they constitute an energy-efficient solution for vehicle propulsion. [ABSTRACT FROM AUTHOR]

Published
2009
Full Text
View/download PDF

11. Control of a Hybrid Excitation Synchronous Generator for Aircraft Applications.

Author

Patin, Nicolas, Vido, Lionel, Monmasson, Eric, Louis, Jean-Paul, Gabsi, Mohamed, and Lécrivain, Michel

Subjects
SYNCHRONOUS generators, ALTERNATING current generators, DIODES, ELECTRIC potential, EXCITATION systems of electric generators, ALTERNATING current machinery
Abstract

This paper deals with the control of a hybrid excitation synchronous generator which is used to supply an isolated grid for aircraft applications. This grid is supposed to be a 270-V dc bus. Thus, a rectifier is required between the machine and the dc bus. A diode rectifier is preferred here due to its great reliability and because it is also a low-cost solution. A controller is then proposed in order to regulate the output dc voltage of the generator. It is finally validated by simulations and experimental results. [ABSTRACT FROM AUTHOR]

Published
2008
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results