Mathias Fakam - Academia.edu (original) (raw)

Papers by Mathias Fakam

Research paper thumbnail of Belfort Etude vibro-acoustique de machines synchrones à aimants à bobinage dentaire

Le Centre pour la Communication Scientifique Directe - HAL - INSU, Dec 1, 2011

RESUME-Cet article présente des résultats de simulations vibro-acoustique pour une machine à bobi... more RESUME-Cet article présente des résultats de simulations vibro-acoustique pour une machine à bobinage dentaire 10 pôles / 12 encoches équipée d'un rotor SPM (Surface Permanent Magnet). La machines répond à un cahier des charges type traction électrique. L'analyse du bruit d'origine électromagnétique, qui est pertinente pour des basses vitesses, devient une étape nécessaire dès la conception. Dans un premier temps, cet article justifie l'orientation vers l'usage des bobinages dentaires. Ensuite, il détaille les méthodes d'analyse utilisées pour la détermination du bruit. La première méthode consiste à réaliser par éléments finis le calcul électromagnétique couplée à un module de calcul analytique mécano-acoustique, et la deuxième méthode réalise des calculs électromagnétiques via un Modèle à Constantes Localisées (MCL) couplé au même module mécano-acoustique. Une première validation est présentée dans le but d'évaluer la capacité de la MCL à proposer un modèle comportemental satisfaisant, nécessaire à l'étude vibro-acoustique.

Research paper thumbnail of Skew effect on the radial pressure of induction motor

2016 Eleventh International Conference on Ecological Vehicles and Renewable Energies (EVER), 2016

Acoustics comfort is an increasingly important factor at the design stage of electrical machines ... more Acoustics comfort is an increasingly important factor at the design stage of electrical machines associated with converters. Skewing has a direct impact on pressure in the air-gap, which can be responsible for electromagnetic noise. This paper aims to compare different models to study the skewing. The impact of pressures is evaluated and analyzed for no-skew and skew rotors. Three numerical electromagnetic models are compared: 2D finite element method (FEM), 2D FEM multi-slice and 3D FEM. In addition, an experimental measurement validates our results.

Research paper thumbnail of Low space order analysis of radial pressure in SPMSM with analytical and convolution approaches

IEEE Transactions on Magnetics, 2016

This paper presents an analysis of low the space order of the air-gap radial Maxwell pressures in... more This paper presents an analysis of low the space order of the air-gap radial Maxwell pressures in Surface Permanent Magnet Synchronous Machines (SPMSM) with fractional slot concentrated windings. The air-gap Maxwell pressures result from the multiplication of the flux density harmonics due to magnetomotive forces and permeance linked to the magnet, the armature, and the stator slots and their interactions. One low space order is selected and different approaches are compared to determine the origin of this pressure. First, an analytical prediction tool ACHFO (Analytical Calculation of Harmonic Force Orders) is issues to calculate the space and time orders of these magnetic pressure harmonics while identifying their origin in terms of interactions between magnet, armature and teeth effects. Additionally, the analytical prediction of ACHFO is compared with the flux density convolution and finite element approaches. The main advantage of our tool is the speed of computation. Finally, an experimental Operational Deflection Shape measurement (ODS) is performed to show the deflection shape of the low space order selected.

Research paper thumbnail of Improved method to compute air-gap magnetic pressure of the Interior Permanent Magnet Synchronous Machine

2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER), 2015

ABSTRACT

Research paper thumbnail of Best paper on ecological vehicles

2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER), 2015

Research paper thumbnail of Outil de prédiction et d’identification des ordres d’espace de la force magnétique radiale dans l’entrefer pour des Machines Synchrones à Aimants Permanents,(MSAP) à bobinage dentaire

Outil de prédiction et d'identification des « ordres et fréquences » de la force radiale pour des... more Outil de prédiction et d'identification des « ordres et fréquences » de la force radiale pour des machines synchrones à aimants permanents (MSAP) à bobinage dentaire.

Research paper thumbnail of Design and Magnetic Noise Reduction of the Surface Permanent Magnet Synchronous Machine Using Complex Air-Gap Permeance

IEEE Transactions on Magnetics, 2015

Nowadays, the development of the electric motorization for land vehicles is essential since the e... more Nowadays, the development of the electric motorization for land vehicles is essential since the energetic challenge has become very critical. This paper presents the development of a tool used for the optimal acoustic and electromechanical modeling which stands out from standard analytical and Finite Element modeling respectively, due to the high accuracy of calculations and the quickness of the resolution. Thanks to a coupling between an analytical model and statics FE simulations, a complex global air-gap permeance per area unit is calculated by our 'hybrid' model, in order to take into account the permeability of magnetic wedges, the height of pre-slots, and the rotor shape. An unequalled level of precision and speed of resolution is obtained for the computation of air-gap magnetic pressures. Some results of comparison between acoustic measurement and simulation on a concentrated winding motor, for different speeds, will be presented.

Research paper thumbnail of Belfort Etude vibro-acoustique de machines synchrones à aimants à bobinage dentaire

Le Centre pour la Communication Scientifique Directe - HAL - INSU, Dec 1, 2011

RESUME-Cet article présente des résultats de simulations vibro-acoustique pour une machine à bobi... more RESUME-Cet article présente des résultats de simulations vibro-acoustique pour une machine à bobinage dentaire 10 pôles / 12 encoches équipée d'un rotor SPM (Surface Permanent Magnet). La machines répond à un cahier des charges type traction électrique. L'analyse du bruit d'origine électromagnétique, qui est pertinente pour des basses vitesses, devient une étape nécessaire dès la conception. Dans un premier temps, cet article justifie l'orientation vers l'usage des bobinages dentaires. Ensuite, il détaille les méthodes d'analyse utilisées pour la détermination du bruit. La première méthode consiste à réaliser par éléments finis le calcul électromagnétique couplée à un module de calcul analytique mécano-acoustique, et la deuxième méthode réalise des calculs électromagnétiques via un Modèle à Constantes Localisées (MCL) couplé au même module mécano-acoustique. Une première validation est présentée dans le but d'évaluer la capacité de la MCL à proposer un modèle comportemental satisfaisant, nécessaire à l'étude vibro-acoustique.

Research paper thumbnail of Skew effect on the radial pressure of induction motor

2016 Eleventh International Conference on Ecological Vehicles and Renewable Energies (EVER), 2016

Acoustics comfort is an increasingly important factor at the design stage of electrical machines ... more Acoustics comfort is an increasingly important factor at the design stage of electrical machines associated with converters. Skewing has a direct impact on pressure in the air-gap, which can be responsible for electromagnetic noise. This paper aims to compare different models to study the skewing. The impact of pressures is evaluated and analyzed for no-skew and skew rotors. Three numerical electromagnetic models are compared: 2D finite element method (FEM), 2D FEM multi-slice and 3D FEM. In addition, an experimental measurement validates our results.

Research paper thumbnail of Low space order analysis of radial pressure in SPMSM with analytical and convolution approaches

IEEE Transactions on Magnetics, 2016

This paper presents an analysis of low the space order of the air-gap radial Maxwell pressures in... more This paper presents an analysis of low the space order of the air-gap radial Maxwell pressures in Surface Permanent Magnet Synchronous Machines (SPMSM) with fractional slot concentrated windings. The air-gap Maxwell pressures result from the multiplication of the flux density harmonics due to magnetomotive forces and permeance linked to the magnet, the armature, and the stator slots and their interactions. One low space order is selected and different approaches are compared to determine the origin of this pressure. First, an analytical prediction tool ACHFO (Analytical Calculation of Harmonic Force Orders) is issues to calculate the space and time orders of these magnetic pressure harmonics while identifying their origin in terms of interactions between magnet, armature and teeth effects. Additionally, the analytical prediction of ACHFO is compared with the flux density convolution and finite element approaches. The main advantage of our tool is the speed of computation. Finally, an experimental Operational Deflection Shape measurement (ODS) is performed to show the deflection shape of the low space order selected.

Research paper thumbnail of Improved method to compute air-gap magnetic pressure of the Interior Permanent Magnet Synchronous Machine

2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER), 2015

ABSTRACT

Research paper thumbnail of Best paper on ecological vehicles

2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER), 2015

Research paper thumbnail of Outil de prédiction et d’identification des ordres d’espace de la force magnétique radiale dans l’entrefer pour des Machines Synchrones à Aimants Permanents,(MSAP) à bobinage dentaire

Outil de prédiction et d'identification des « ordres et fréquences » de la force radiale pour des... more Outil de prédiction et d'identification des « ordres et fréquences » de la force radiale pour des machines synchrones à aimants permanents (MSAP) à bobinage dentaire.

Research paper thumbnail of Design and Magnetic Noise Reduction of the Surface Permanent Magnet Synchronous Machine Using Complex Air-Gap Permeance

IEEE Transactions on Magnetics, 2015

Nowadays, the development of the electric motorization for land vehicles is essential since the e... more Nowadays, the development of the electric motorization for land vehicles is essential since the energetic challenge has become very critical. This paper presents the development of a tool used for the optimal acoustic and electromechanical modeling which stands out from standard analytical and Finite Element modeling respectively, due to the high accuracy of calculations and the quickness of the resolution. Thanks to a coupling between an analytical model and statics FE simulations, a complex global air-gap permeance per area unit is calculated by our 'hybrid' model, in order to take into account the permeability of magnetic wedges, the height of pre-slots, and the rotor shape. An unequalled level of precision and speed of resolution is obtained for the computation of air-gap magnetic pressures. Some results of comparison between acoustic measurement and simulation on a concentrated winding motor, for different speeds, will be presented.