VALEO Systemes Electriques

Créteil, France

VALEO Systemes Electriques

Créteil, France

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Mac D.H.,L2EP Art et Me tiers Paris Technology | CleNet S.,L2EP Art et Me tiers Paris Technology | Mipo J.C.,VALEO Systemes Electriques
IET Science, Measurement and Technology | Year: 2012

Methods are now available to solve numerically electromagnetic problems with uncertain input data (behaviour law or geometry). The stochastic approach consists in modelling uncertain data using random variables. Discontinuities on the magnetic field distribution in the stochastic dimension can arise in a problem with uncertainties on the geometry. The basis functions (polynomial chaos) usually used to approximate the unknown fields in the random dimensions are no longer suited. One possibility proposed in the literature is to introduce additional functions (enrichment function) to tackle the problem of discontinuity. In this study, the authors focus on the method of random mappings they show that in this case the discontinuity are naturally taken into account that no enrichment function needs to be added. © 2012 The Institution of Engineering Technology.


Nguyen P.H.,Ecole Normale Superieure de Cachan | Hoang E.,Ecole Normale Superieure de Cachan | Gabsi M.,Ecole Normale Superieure de Cachan | Kobylanski L.,VALEO Systemes Electriques | Condamin D.,Leroy Somer
IEEE International Symposium on Industrial Electronics | Year: 2010

This paper presents the comparison of three permanent magnet synchronous machines (PMSMs) with concentrated flux, the first two machines with fractional slot windings and the other with distributed windings considered as the reference machine. Therefore, the advantages of PMSMs with fractional slot windings were showed. Then, the computation method of the average copper losses, the average iron losses and the average flux weakening copper losses during the driving cycle of a hybrid electric vehicle (HEV) was presented. Finally, a comparative study during the driving cycles of three machines gives a global view of machine performances assembled for a HEV application. © 2010 IEEE.


Maloberti O.,CNRS Electrical Engineering Laboratory of Paris | Marchand C.,CNRS Electrical Engineering Laboratory of Paris | Choua Y.,CNRS Electrical Engineering Laboratory of Paris | Condamin D.,Leroy Somer | And 2 more authors.
19th International Conference on Electrical Machines, ICEM 2010 | Year: 2010

This paper deals with axial flux machine for hybrid electric vehicles and the sizing of one of those. The first part (§ I. ) draws the academic and industrial context of this work up with a short and summed up state of the art. The second section (§ II. ) is dedicated to a geometrical modelling compatible with axial structures and conception needs. In the third and fourth divisions (§ III. and § IV. ), the magnetic and thermal modellings of one specific machine are built and simulated thanks to three different methods. At the end (§ V.), provided calculations are compared to each other, to an accurate finite element analysis and finally to experimental results coming from one prototype. The aim is to propose an optimal conception with the help of gradual methods1. ©2010 IEEE.


Ramarotafika R.,University of Lille Nord de France | Ramarotafika R.,Arts et Metiers ParisTech | Benabou A.,University of Lille Nord de France | Clenet S.,University of Lille Nord de France | And 2 more authors.
IEEE Transactions on Magnetics | Year: 2012

Manufacturing processes may introduce a significant variability on the magnetic properties of claw pole generator stators. The present work deals with the analysis of two groups of stator samples. The first group is composed of 28 slinky stators (SS) and the second group is composed of 5 stators, manufactured using laser cut stacked laminations (SL). Both groups are made from the same lamination grade and with the same geometrical dimensions. Characterization was carried out for several levels of excitation field at 50 Hz. A noticeable variability has been observed on the iron losses for SS samples, whereas it appears to be not significant for SL samples. The loss separation technique has then been investigated for the SS samples. Results show that the variability of static losses is more important than the one of dynamic losses. © 2006 IEEE.


Aubertin M.,Valeo Systemes Electriques | Henneron T.,Lille University of Science and Technology | Piriou F.,Lille University of Science and Technology | Mipo J.-C.,Valeo Systemes Electriques
IEEE Transactions on Magnetics | Year: 2012

For a magnetodynamic problem decomposed into subdomains, the Mortar method can be associated with potential formulations to connect nonconforming meshes. In this paper, we propose to use the bi-orthogonal nodal shape functions with the Mortar method in the case of varphi formulation. Academic examples will be studied to shown the efficiency of the proposed model. © 2012 IEEE.


Mac D.H.,L2EP Art et Metiers Paris Technology | Clenet S.,L2EP Art et Metiers Paris Technology | Mipo J.C.,VALEO Systemes Electriques
IET Conference Publications | Year: 2011

While solving a problem with random domains, discontinuities on the magnetic field distribution in the stochastic dimension appear. Numerical methods are already available to account for random domains. Some of them require the use of additional approximation functions to tackle the problem of discontinuity. In this paper, we focus on a method based the use of a random mapping and we show that in that case the discontinuities are naturally approximated and that no additional approximation function needs to be added.


Vogt J.-B.,CNRS Materials and Transformations Unit of UMET | Bouquerel J.,CNRS Materials and Transformations Unit of UMET | Leaux F.,CNRS Materials and Transformations Unit of UMET | Palleschi F.,VALEO Systemes Electriques
Procedia Engineering | Year: 2013

Components of new car alternators are subjected fatigue damage due to the start-stop cycles. Predicting their fatigue life still requires needs an experimental validation. Hence, identification of both monotonic and cyclic behaviour is required to integrate the right values in the models. Therefore a precise analysis of the dislocation arrangement produced by cyclic plasticty appears as a fatigue damage indicator. Here SEM-EBSD provide two plasticity markers: the Kernel Average Misorientation and the Low Angel Grain Boundaries that characterize dislocations arrangements in a quantitative way. Based on these indexes, the comparison between lab fatigue specimens and component gives an estimation of the local cyclic plastic strain. © 2013 The Authors. Published by Elsevier Ltd.


Mac D.H.,Arts et Metiers ParisTech | Clenet S.,Arts et Metiers ParisTech | Mipo J.C.,VALEO Systemes Electriques
Digests of the 2010 14th Biennial IEEE Conference on Electromagnetic Field Computation, CEFC 2010 | Year: 2010

A method to solve stochastic partial differential equations in random domains consists in using a one to one random mapping function which transforms a deterministic domain into this random domain. The question is now how to determine this random mapping. This paper addresses two methods, one based on the solution of a Laplace equation and one based on a geometric transformation method. An electrokinetic example is presented to compare both methods. © 2010 IEEE.


Liu S.,Arts et Metiers ParisTech | Clenet S.,Arts et Metiers ParisTech | Coorevits T.,Arts et Metiers ParisTech | Mipo J.C.,VALEO Systemes Electriques
2014 17th International Conference on Electrical Machines and Systems, ICEMS 2014 | Year: 2015

Imperfections of the manufacturing process can modify the shape of the electrical machine parts which dimensions are then not equal to the nominal ones. In this communication, the influence of three types of stator deformation is studied in the case of a synchronous claw pole machine with a non linear 3D finite element model accounting for the movement. © 2014 IEEE.


Mac D.H.,Arts et Metiers ParisTech | Clenet S.,Arts et Metiers ParisTech | Mipo J.C.,VALEO Systemes Electriques | Tsukerman I.,University of Akron
IEEE Transactions on Magnetics | Year: 2013

To solve stochastic problems with geometric uncertainties, one can transform the original problem in a domain with stochastic boundaries and interfaces to a problem defined in a deterministic domain with uncertainties in the material behavior. The latter problem is then discretized. There exist infinitely many random mappings that lead to identical results in the continuous domain but not in the discretized domain. In this paper, an a priori error indicator is proposed for electromagnetic problems with scalar and vector potential formulations. This leads to criteria for selecting random mappings that reduce the numerical error. In an illustrative numerical example, the proposed a priori error indicator is compared with an a posteriori estimator for both potential formulations. © 1965-2012 IEEE.

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