Slot/pole Combinations Choice for Concentrated Multiphase Machines dedicated to Mild-Hybrid Applications

Version de l'éditeur à l'adresse suivante : http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6119910&isnumber=6119266This paper presents multiphase permanent magnet machines with concentrated non-overlapped winding as a good candidate for automotive low voltage mild-hybrid applications. These machines often require a trade-off between low speed performances such as high torque density and high speed performances like flux weakening capabilities. This paper describes how to choose a key design parameter to ease this compromise, the slots/poles combination, according to three parameters: winding factor including harmonics factor, rotor losses amount thanks to a comparison factor and radial forces balancing. The comparison criterion are based on both analytical formula and Finite Element Analysis.Projet MHYGALE/ ADEM

Influence of Rotor Structure and Number of Phases on Torque and Flux Weakening Characteristics of V-shape Interior PM Electrical Machine

Version plus complete dans Journal of Energy and Power Engineering-2012.09 pp1461 a 1471This paper investigates the influence of the rotor structure on torque and Flux weakening region of V-shape IPM machine from TOYOTA PRIUS type, more specifically, keeping always the same magnet volume, we study the effect of the open angle between the two magnet segments of each V-shape pole on the machine performance. Moreover, in order to examine the impact of phase number on the machine characteristics, PRIUS structure is transformed into 5-phase machine of the same type and dimensions. As well, an optimization procedure is carried out to determine the optimal open angle according to main characteristics. The previous investigation is done by using a free Finite Elements Methods (FEM) program coupled with another optimization program. Using this obtained methodology the study analyzes for 3-phase and 5-phase machine the average and pulsation of torque, cogging torque, phase back-EMF, constant power operating capability.MHYGALE ADEME PROJEC

Influence of Rotor Structure and Number of Phases on First and Second Order Characteristics of TOYOTA PRIUS Electrical Machine Type

Version enrichie dans Journal of Energy and Power Engineering-2012.09 pp1461 a 1471This paper investigates the influence of the rotor structure on torque and Flux weakening region of V-shape IPM machine from TOYOTA PRIUS type, more specifically, keeping always the same magnet volume, we study the effect of the open angle between the two magnet segments of each V-shape pole on the machine performance. Moreover, in order to examine the impact of phase number on the machine characteristics, PRIUS structure is transformed into 5-phase machine of the same type and dimensions. As well, an optimization procedure is carried out to determine the optimal open angle according to main characteristics. The previous investigation is done by using a free Finite Elements Methods (FEM) program coupled with another optimization program. Using this obtained methodology the study analyzes for 3-phase and 5-phase machine the average and pulsation of torque, cogging torque, phase back-EMF, constant power operating capability.ADEME MHYGALE projec

Topology Optimisation of a 3D Electromagnetic Device using the SIMP Density-Based Method

International audienceThe presented paper proposes a topology optimisation methodology based on the density-based method SIMP, and applied to a numerical example to validate the former. The approach and methodology are detailed, and the results for a 3D basic electromagnetic example are presented. The non-linear B(H) curve is also taken into account

Sensor placement for field reconstruction in rotating electrical machines

A method is proposed to place sensors in an electrical machine in order to be able to reconstruct the magnetic field distribution. This method is based on the Empirical Interpolation Method combined with the Maxvol technique. The results applied on a surface mounted permanent magnet machine at no load show that the field distribution can be accurately reconstructed even when the sensor location is imposed in the airgap of the rotating machine.This work has been carried out within the framework of CE2I project. CE2I is co-financed by European Union with the financial support of European Regional Development Fund (ERDF), French State and the French Region of Hauts-de-France

Parallel Direct Solver for the Finite Integration Technique in Electrokinetic Problems

International audienceThe finite integration technique allows the simulation of real-world electromagnetic field problems with complex geometries. It provides a discrete reformulation of Maxwell's equations in their integral form suitable for numerical computing. The resulting matrix equations of the discretized fields can be used for efficient numerical simulations on modern computers and can be exploited to use a parallel computing. In fact, by reordering the unknowns by the nested dissection method, it is possible to directly construct the lower triangular matrix of the Cholesky factorization with many processors without assembling the matrix system. In this paper, a parallel algorithm is proposed for the direct solution of large sparse linear systems with the finite integration technique. This direct solver has the advantage of handling singularities in the matrix of linear systems. The computational effort for these linear systems, often encountered in numerical simulation of electromagnetic phenomena by finite integration technique, is very significant in terms of run-time and memory requirements. Many numerical tests have been carried out to evaluate the performance of the parallel direct solver. Index Terms—Finite element methods, finite integration technique, linear systems, numerical analysis, parallel algorithms

Influence of Rotor Structure and Number of Phases on First and Second Order Characteristics of TOYOTA PRIUS Electrical Machine Type

Version enrichie dans Journal of Energy and Power Engineering-2012.09 pp1461 a 1471This paper investigates the influence of the rotor structure on torque and Flux weakening region of V-shape IPM machine from TOYOTA PRIUS type, more specifically, keeping always the same magnet volume, we study the effect of the open angle between the two magnet segments of each V-shape pole on the machine performance. Moreover, in order to examine the impact of phase number on the machine characteristics, PRIUS structure is transformed into 5-phase machine of the same type and dimensions. As well, an optimization procedure is carried out to determine the optimal open angle according to main characteristics. The previous investigation is done by using a free Finite Elements Methods (FEM) program coupled with another optimization program. Using this obtained methodology the study analyzes for 3-phase and 5-phase machine the average and pulsation of torque, cogging torque, phase back-EMF, constant power operating capability.ADEME MHYGALE projec

Influence of Rotor Structure and Number of Phases on Torque and Flux Weakening Characteristics of V-shape Interior PM Electrical Machine

Version plus complete dans Journal of Energy and Power Engineering-2012.09 pp1461 a 1471This paper investigates the influence of the rotor structure on torque and Flux weakening region of V-shape IPM machine from TOYOTA PRIUS type, more specifically, keeping always the same magnet volume, we study the effect of the open angle between the two magnet segments of each V-shape pole on the machine performance. Moreover, in order to examine the impact of phase number on the machine characteristics, PRIUS structure is transformed into 5-phase machine of the same type and dimensions. As well, an optimization procedure is carried out to determine the optimal open angle according to main characteristics. The previous investigation is done by using a free Finite Elements Methods (FEM) program coupled with another optimization program. Using this obtained methodology the study analyzes for 3-phase and 5-phase machine the average and pulsation of torque, cogging torque, phase back-EMF, constant power operating capability.MHYGALE ADEME PROJEC

Contribution to the 3D modelling of low frequency electromagnetic systems using finite integration technique (FIT)

La méthode des éléments finis (MEF) est la méthode la plus utilisée pour résoudre numériquement des problèmes rencontrés en mécanique, en thermique, en électromagnétisme, etc. Dans le domaine du génie électrique elle permet de réaliser la simulation de dispositifs électromagnétiques avec une grande précision. Cependant, devant les capacités grandissantes des outils de calcul, on est amené à modéliser des systèmes de plus en plus complexes. Paradoxalement, devant les temps de calcul importants que cela engendre, l’intérêt des industriels se porte sur des méthodes alternatives permettant d’obtenir des résultats plus rapidement. Les travaux menés durant cette thèse se sont portés sur l’étude d’une méthode alternative, la technique d’intégration finie (FIT). Cette méthode permet d’obtenir un bon compromis entre rapidité des temps de calcul et qualité de la solution. À travers des problèmes d’électrocinétique, de magnétostatique et de magnétodynamique, il est montré, avec ces travaux, que les résultats obtenus à l’aide de la FIT sont de bonnes qualités comparés à la méthode des éléments finis. Des outils appliqués à l’imposition des grandeurs globales électriques et magnétiques sont aussi présentés dans ce travail.To solve numerically the mechanics, thermals and magnetodynamics problems, the finite element method is the most used. In electrical engineering, this method allows the simulation of electromagnetic devices with a great accuracy. However, in spite of growing capacity of the computers, the studied models become more and more complicated. From an industrial point of view, these computation times are not acceptable. Therefore, a fast and reliable numerical tool is necessary. The developments realized during this thesis concern an alternative method, the finite integration technique. This method allows finding a compromise between computation times and accuracy. For the cases of electrokinetics, magnetostatics and magnetodynamics, simulations using FIT proved that results are accurate. Mathematical tools used to impose the electric and magnetic quantities

Contribution à la modélisation 3D des systèmes électromagnétiques basse fréquence à l'aide de la méthode d'intégration finie (FIT)

La méthode des éléments finis (MEF) est la méthode la plus utilisée pour résoudre numériquement des problèmes rencontrés en mécanique, en thermique, en électromagnétisme, etc. Dans le domaine du génie électrique elle permet de réaliser la simulation de dispositifs électromagnétiques avec une grande précision. Cependant, devant les capacités grandissantes des outils de calcul, on est amené à modéliser des systèmes de plus en plus complexes. Paradoxalement, devant les temps de calcul importants que cela engendre, l intérêt des industriels se porte sur des méthodes alternatives permettant d obtenir des résultats plus rapidement. Les travaux menés durant cette thèse se sont portés sur l étude d une méthode alternative, la technique d intégration finie (FIT). Cette méthode permet d obtenir un bon compromis entre rapidité des temps de calcul et qualité de la solution. À travers des problèmes d électrocinétique, de magnétostatique et de magnétodynamique, il est montré, avec ces travaux, que les résultats obtenus à l aide de la FIT sont de bonnes qualités comparés à la méthode des éléments finis. Des outils appliqués à l imposition des grandeurs globales électriques et magnétiques sont aussi présentés dans ce travail.To solve numerically the mechanics, thermals and magnetodynamics problems, the finite element method is the most used. In electrical engineering, this method allows the simulation of electromagnetic devices with a great accuracy. However, in spite of growing capacity of the computers, the studied models become more and more complicated. From an industrial point of view, these computation times are not acceptable. Therefore, a fast and reliable numerical tool is necessary. The developments realized during this thesis concern an alternative method, the finite integration technique. This method allows finding a compromise between computation times and accuracy. For the cases of electrokinetics, magnetostatics and magnetodynamics, simulations using FIT proved that results are accurate. Mathematical tools used to impose the electric and magnetic quantities.LILLE1-Bib. Electronique (590099901) / SudocSudocFranceF