Fiche individuelle
Raphaël PILE | ||
Titre | Docteur | |
Equipe | Outils et Méthodes Numériques | |
Adresse | Université de LILLE Avenue Paul langevin 59655 VILLENEUVE-D'ASCQ | |
Téléphone | +33 (0)3-XX-XX-XX-XX | |
raphael.pile@etudiant.univ-lille1.fr | ||
Réseau scientifique | https://www.researchgate.net/profile/Raphael_Pile | |
Observation / Thématique de recherche | Couplage magnéto-mécanique & Modèles réduits | |
Publications |
ACLI Revue internationale avec comité de lecture |
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[1] Study of the Combined Effects of the Air-Gap Transfer for Maxwell Tensor and the Tooth Mechanical Modulation in Electrical Machines IEEE Transactions on Magnetics, Vol. 56, N°. 1, 01/2020, URL, Abstract PILE Raphaël, LE MENACH Yvonnick, LE BESNERAIS Jean, PARENT Guillaume |
The Maxwell Tensor (MT) method is widely used to compute global forces or local surface forces for vibroacoustic design of electrical machines under electromagnetic excitation. In particular, the air-gap MT method is based on a cylindrical shell in the middle of the air gap. This article proposes to quantify the differences between the air-gap MT and the magnetic force wave experienced by the stator. In particular, the air gap to stator transfer and the tooth mechanical modulation effects are studied. A new formula is proposed to extend the tooth modulation effect to tangential forces. A numerical application is performed with a turbo-alternator to illustrate the respective and combined effects of both phenomena. This article highlights that the tooth mechanical modulation is relevant even for electrical machines with a high number of teeth. In addition, the combination of the two phenomena has a clear impact on the calculated surface force. Therefore, it is recommended to take into account the air-gap transfer for any study of the tooth mechanical modulation effect. |
[2] Comparison of main magnetic force computation methods for noise and vibration assessment in electrical machines IEEE Transactions on Magnetics, 05/2018, URL, Abstract PILE Raphaël, DEVILLERS Emile, LE BESNERAIS Jean |
This paper presents a comparison of several methods to compute the magnetic forces experienced by the stator teeth of electrical machines. In particular, the comparison focuses on the virtual work principle (VWP)-based nodal forces and the Maxwell tensor (MT) applied on different surfaces. The VWP is set as the reference. The magnetic field is computed either with finite element analysis or with the semi-analytical subdomain method (SDM). First, the magnetic saturation in iron cores is neglected (linear B-H curve). Then, the saturation effect is discussed in a second part. Homogeneous media are considered and all simulations are performed in 2-D. The link between the slot's magnetic flux and the tangential force harmonics is also highlighted. The comparison is performed on the stator of a surface-mounted permanent-magnet synchronous machine. While the different methods disagree on the local distribution of the magnetic forces at the stator surface, they give similar results concerning the integrated forces per tooth, referred as lumped forces. This conclusion is mitigated for saturated cases: the time harmonics are correctly computed with any of the presented lumped force methods but the amplitude of each harmonic is different between methods. Nonetheless, the use of the SDM remains accurate with MT in the air gap even with saturation for design and diagnostic of electromagnetic noise in electrical machines. However, for more accurate studies based on the local magnetic pressure, the VWP is strongly recommended. |
ACT Conférence internationale avec acte |
[1] e-NVH Response Synthesis of Electric Motors Based on Stator Teeth FRF Measurements ISEF 2019 (Nancy), 08/2019, Abstract PILE Raphaël, LE BESNERAIS Jean, DEVILLERS Emile, DEGRENDELE Karine |
The vibro-acoustic analysis of electrical machines under electromagnetic excitations (e-NVH) partly relies on the analysis of the stator response under Maxwell stress harmonic waves. In particular, the notion of unit-wave Frequency Response Function (FRF) is often used to diagnose magnetic noise issues during numerical simulations. However, such an FRF cannot be experimentally measured. This communication demonstrates the use of the stator tooth tip FRF which is compatible with both numerical and experimental approaches, and makes the link between tooth-excitation and wave-excitation based FRF. The two methods are compared in terms of physical insights and numerical aspects. |
[2] Study of the combined effects of the airgap transfer for Maxwell Tensor and the tooth mechanical modulation in electrical machines Compumag'19, 07/2019, Abstract PILE Raphaël, LE MENACH Yvonnick, LE BESNERAIS Jean, PARENT Guillaume |
The Maxwell Tensor (MT) method is widely used to compute global forces or local surface forces for vibroacoustic design of electrical machines under electromagnetic excitation. In particular the airgap Maxwell Tensor method is based on a cylindrical shell in the middle of the airgap. This communication proposes to quantify the differences between the airgap MT and the magnetic force wave experienced by the stator. In particular the airgap to stator transfer and the tooth mechanical modulation effect are studied. A numerical application is performed with a turbo-alternator to illustrate the respective and combined effects of both phenomena. The communication highlights that the tooth mechanical modulation alone is not necessary relevant for electrical machines with a high number of tooth. However the combination of both phenomena has a clear impact on the computed magnetic surface force. |
[3] Application Limits of the Airgap Maxwell Tensor CEFC 2018, 10/2018, Abstract PILE Raphaël, PARENT Guillaume, DEVILLERS Emile, HENNERON Thomas, LE MENACH Yvonnick, LE BESNERAIS Jean, LECOINTE Jean-Philippe |
In an electrical machine, the Maxwell Tensor is widely used to compute global forces or local pressure along a surface in
the air. This communication proposes to highlight the limits of the method with an academic case of slotless stator and rotor.
In particular an analytic demonstration shows the existence of coefficients depending on the geometry and the wavenumber
between the application of the Maxwell Tensor in the air-gap and the stator magnetic pressure. |
[4] Pyleecan: an open-source Python object-oriented software for the multiphysic design optimization of electrical machines ICEM 2018, 09/2018, URL, Abstract BONNEEL Pierre, LE BESNERAIS Jean, PILE Raphaël, DEVILLERS Emile |
This paper presents the first open-source development project for the electromagnetic design optimization of electrical machines and drives named Pyleecan – PYthon Library for Electrical Engineering Computational ANalysis. This paper first details the objectives of Pyleecan open-source development project, and the object-oriented architecture of the software that has been developed and released. Then it reviews and compares the available free and open-source software used during the multiphysic design of electrical machines including electromagnetics, heat transfer and vibro-acoustic analysis. |
TH Thèse |
[1] Méthodes Numériques Appliquées au Calcul des Vibrations d’Origine Electromagnétique : Schémas de Projection des Efforts Magnétiques et Développement de Modèles Réduits Thèse, 01/2021, URL, Abstract PILE Raphaël |
La présence d’harmoniques de forces électromagnétiques dans les machines électriques est généralement source de bruit acoustique et de vibrations (B&V). Ce phénomène doit être considéré dès les premières phases de conception pour respecter les normes en matière de B&V, en particulier dans le secteur automobile. Le niveau de B&V s’obtient à partir d’une simulation multi-physiques basée sur des modèles électromagnétiques, mécaniques et acoustiques, de préférence rapides et précis de manière à l’inclure le plus tôt possible dans la phase de conception. Cette thèse CIFRE est partie intégrante du programme de recherche interne de la société EOMYS ENGINEERING, qui développe et commercialise son logiciel MANATEE dédié à la simulation électromagnétique et vibroacoustique des machines électriques. Dans ce contexte de modélisation, cette thèse porte sur la méthode électromagnétique semi-analytique des sous-domaines pour le calcul des harmoniques de forces 2D dans l’entrefer d’une large variété de machines électriques, et se concentre particulièrement sur la Machine Synchrone à Aimant Permanents en Surface (MSAPS) et la machine asynchrone à cage d’écureuil. La thèse s’intéresse également à deux verrous scientifiques concernant la contribution des forces tangentielles au niveau de vibration global, et l’effet de modulation des dents qui apparaît dans les machines avec un nombre proche d’encoches et de pôles. A cet effet, un banc d’essai comprenant une machine bruyante particulière (une MSAPS avec 12 encoches et 10 pôles) et l’instrumentation nécessaire a été conçu et réalisé. Le banc d’essai vise enfin à comparer les différents modèles utilisés couramment dans les simulations B&V. |
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