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Bibliografie tematiche / Variable flux memory machines

Letteratura scientifica selezionata sul tema "Variable flux memory machines"

Autore: Grafiati

Pubblicato: 8 giugno 2024

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Articoli di riviste sul tema "Variable flux memory machines":

1

Zhou, Zicheng, Hao Hua e Ziqiang Zhu. "Flux-Adjustable Permanent Magnet Machines in Traction Applications". World Electric Vehicle Journal 13, n. 4 (29 marzo 2022): 60. http://dx.doi.org/10.3390/wevj13040060.

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This paper overviews the recent advances in flux-adjustable permanent magnet (PM) machines for traction applications. The flux-adjustable PM machines benefit from the synergies of the high torque density and high efficiency in conventional PM machines as well as the controllable air-gap field in wound-field machines, which are attractive for the traction applications requiring enhanced capabilities of speed regulation and uncontrolled voltage mitigation. In general, three solutions have been presented, namely the hybrid excited (HE), the mechanically regulated (MR), and the variable flux memory (VFM) machines. Numerous innovations were proposed on these topics during the last two decades, while each machine topology has its own merits and demerits. The purpose of this paper is to review the development history and trend of the flux-adjustable PM machines, with particular reference to their topologies, working mechanism, and electromagnetic performance.

2

Yang, Hui, Heyun Lin, Erxing Zhuang, Shuhua Fang e Yunkai Huang. "Investigation of design methodology for non‐rare‐earth variable‐flux switched‐flux memory machines". IET Electric Power Applications 10, n. 8 (settembre 2016): 744–56. http://dx.doi.org/10.1049/iet-epa.2015.0427.

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3

Yang, Hui, Heyun Lin e Z. Q. Zhu. "Recent advances in variable flux memory machines for traction applications: A review". CES Transactions on Electrical Machines and Systems 2, n. 1 (marzo 2018): 34–50. http://dx.doi.org/10.23919/tems.2018.8326450.

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4

Zhong, Yuxiang, Heyun Lin, Zhiyong Chen, Shukang Lyu e Hui Yang. "Online-Parameter-Estimation-Based Control Strategy Combining MTPA and Flux-Weakening for Variable Flux Memory Machines". IEEE Transactions on Power Electronics 37, n. 4 (aprile 2022): 4080–90. http://dx.doi.org/10.1109/tpel.2021.3126581.

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5

Zhu, Z. Q., Hao Hua, Adam Pride, Rajesh Deodhar e Toshinori Sasaki. "Analysis and Reduction of Unipolar Leakage Flux in Series Hybrid Permanent-Magnet Variable Flux Memory Machines". IEEE Transactions on Magnetics 53, n. 11 (novembre 2017): 1–4. http://dx.doi.org/10.1109/tmag.2017.2706764.

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6

Xie, Ying, Zhaoyang Ning e Zexin Ma. "Comparative Study on Variable Flux Memory Machines With Different Arrangements of Permanent Magnets". IEEE Access 8 (2020): 164304–12. http://dx.doi.org/10.1109/access.2020.3022595.

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7

Yang, Hui, Z. Q. Zhu, Heyun Lin, Shuhua Fang e Yunkai Huang. "Comparative Study of Novel Variable-Flux Memory Machines Having Stator Permanent Magnet Topologies". IEEE Transactions on Magnetics 51, n. 11 (novembre 2015): 1–4. http://dx.doi.org/10.1109/tmag.2015.2451642.

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8

Hua, Hao, Z. Q. Zhu, Adam Pride, Rajesh Deodhar e Toshinori Sasaki. "Comparative Study on Variable Flux Memory Machines With Parallel or Series Hybrid Magnets". IEEE Transactions on Industry Applications 55, n. 2 (marzo 2019): 1408–19. http://dx.doi.org/10.1109/tia.2018.2879858.

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9

Huang, Yunrui, Hui Yang, Hao Zheng, Heyun Lin e Z. Q. Zhu. "Analysis of flux barrier effect of LCF PM in series hybrid magnet variable flux memory machine". AIP Advances 13, n. 2 (1 febbraio 2023): 025230. http://dx.doi.org/10.1063/9.0000611.

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Variable flux memory machines (VFMMs) with series hybrid magnets using both low coercive force (LCF) and high coercive force (HCF) permanent magnets (PMs) have been recognized as a viable candidate for wide-speed-range industrial applications due to the advantages of high torque density and wide speed range. Nevertheless, the adverse effects of LCF PM on the HCF PM in series-type VFMM under different magnetization states (MSs) are still unreported. In this paper, the flux barrier effect (FBE) of the LCF PM existing in series hybrid magnet VFMM is first revealed, and its causes are discussed as well as analyzed in depth on the basis of the equivalent magnetic circuit method and finite-element (FE) analyses. A topology of VFMM with dual-layer PMs is further developed to alleviate the FBE induced from LCF PMs. It can be found that the FBE can be effectively suppressed by employing the dual-layer (DL) PM arrangement and additional leakage flux paths. A prototype of the proposed design is built, and the theoretical and FE results are experimentally verified.

10

Yang, Hui, Hao Zheng, Heyun Lin, Zi-Qiang Zhu, Weinong Fu, Wei Liu, Jiaxing Lei e Shukang Lyu. "Investigation of Hybrid-Magnet-Circuit Variable Flux Memory Machines With Different Hybrid Magnet Configurations". IEEE Transactions on Industry Applications 57, n. 1 (gennaio 2021): 340–51. http://dx.doi.org/10.1109/tia.2020.3033836.

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Più fonti

Tesi sul tema "Variable flux memory machines":

1

Domingues, de Sousa Flávia. "Study and modeling of a Fe-Cr-Co magnet based Variable Flux Memory Machine for its supply and mechanical sensorless control at high speed". Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0105.

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Les Machines Synchrones à Aimants Permanents (MSAPs) sont largement utilisées pour les applications d'électrification des transports. En produisant son flux magnétique à partir des aimants à base des terres rares (par exemple, Nd-Fe-B), ces machines ont été remise en question ces dernières années en raison des risques d'approvisionnement, de la variabilité des prix et des défis environnementaux liés à ces matériaux magnétiques mentionnés. À ce scénario, s'ajoutent également les limitations d'usage des MSAPs dans de grandes plages de couple-vitesse, nécessitant généralement des stratégies de défluxage, mises en œuvre en imposant une valeur de plus en plus négative à la composant direct du courant statorique à mesure que la machine accélère. Dans le cas de machines à pôles lises, en conséquence du défluxage, les pertes par effet Joule augmentent et le rendement réduit. Capables de fonctionner dans une large plage couple-vitesse, les Machines à Mémoire de Flux Variable (MMFVs) ont émergé comme une option caractérisée par une densité de flux magnétique réglable à partir des impulsions de courant de courte durée alimentant les enroulements de l'armature. Tout cela grâce à la boucle d'hystérésis fortement non linéaire qui caractérise les aimants à faible force coercitive utilisés comme source de flux. Les alliages Al-Ni-Co sont le choix de nombreuses recherches pour ces applications. Des matériaux magnétiques similaires comme le Fe-Cr-Co sont encore peu explorés, malgré leurs avantages comme sa faible teneur en Cobalt et ses propriétés mécaniques. Dans ce cadre, cette thèse propose l'étude d'une MMFV du type simple, avec une paire de pôles et sans enroulement dédié à la magnétisation. La géométrie de la machine est conçue à partir d'une MSAP, pour laquelle un rotor à base des aimants Nd-Fe-B est remplacé par un cylindre massif à base de FeCrCo36/5. Tout d'abord, nous nous concentrons sur l'étude du comportement magnétique de l'aimant lorsqu'il est inséré dans l'environnement de la machine. En raison de l'anisotropie différenciant la boucle d'hystérésis du Fe-Cr-Co dans les directions facile ou difficile d'aimantation, deux méthodologies sont proposées pour décrire le profil d'aimantation partielle via des tests expérimentaux à l'arrêt et des simulations par éléments finis. Les résultats obtenus sont comparés à la référence définie par des mesures à partir d'un équipement idéal (HysteresisGraph). Les effets dû à la géométrie et saturation du stator, et encore, à l'anisotropie de forme, justifient les différences observées. Les études qui suivent sont focalisés sur la magnétisation et le contrôle du couple en dynamique à partir de l'utilisation d'un algorithme de commande sans capteur de position au rotor. Dans ce contexte, cette recherche propose l'implémentation d'une Boucle à Verrouillage de phase du type Proportionnel Intégral pour estimer la position et la vitesse du rotor à partir de la mesure des tensions statoriques. Une attention est portée sur la compensation de l'angle de décalage nécessaire pour ajuster la position mentionnée en fonction du système d'acquisition (filtres actifs) et des caractéristiques de la méthode d'estimation utilisée. Une étude de sensibilité paramétrique identifie les inductances d'axes d et q comme des paramètres critiques pour l'estimation de l'angle de correction. Ainsi, cette thèse s'intéresse également à proposer une méthodologie pour décrire ces inductances à partir simulations par éléments finis. Les effets d'anisotropie de l'aimant et aussi la saturation statorique sont prises en compte. Une réluctance variable est identifiée dans la machine et son impact sur l'angle de correction étudié
Permanent Magnet Synchronous Machines (PMSMs) have been widely used for electrification transportation applications. Producing their magnet flux from rare-earth magnets (e.g. Nd-Fe-B magnets), these machines have had their long-term use increasingly questioned due to the risks of supply, price variability and the environmental challenges related to the extraction and recycling of these mentioned materials. To this scenario, can be also added the limitations of PMSMs for being used in large torque-speed ranges, requiring usually the implementation of flux-weakening strategies, based on supplying the machine with an increasingly negative direct stator current component as the rotor speed also increases. In case of non-salient pole machines the Joule losses can be enhanced and the efficiency consequently reduced. Capable of operating in a wide torque-speed range, the Variable Flux Memory Machines (VFMMs) have emerged as an option characterized by controllable magnetic flux density from short-time currents pulses supplying the armature windings. All this thanks to the highly non-linear hysteresis loop characterizing the low coercive force magnets used as source of flux. Al-Ni-Co alloys has been the choice of many researches for these applications. However, similar magnetic materials as Fe-Cr-Co are still little explored, besides advantageous characteristics as their lower content of Cobalt and mechanical proprieties. Within this framework, this thesis proposes the study of single-type AC-magnetized single pole pair VFMM, composed of a Fe-Cr-Co-based rotor. The machine geometry is designed from a PMSM, in which the rotor pf Nd-Fe-B is directly replaced by a solid cylinder of FeCrCo36/5. First, a focus on the study of the magnetic behavior of the magnet when inserted in the machine environment. Because of the anisotropy differentiating the hysteresis loop of the FeCrCo36/5 in the a easy or hard magnetization directions, two different methodologies are proposed for describing the partial magnetization profile via experimental tests at standstill and Finite Element Analysis simulations. The achieved results are compared with the reference obtained from an ideal measuring equipment (HysteresisGraph). The effects of a stator saturation and geometry as also the anisotropy shape are explored for justifying the differences observed. A following study focused on the magnetization under operation and the torque control is developed considering the an adapted sensorless algorithm. In this context, the present research proposes the use of a Proportional Integral Phase Locked-Loop for estimating the rotor position and speed. An attention is given to the offset angle compensation required for adjusting the mentioned position according to the acquisition system (active filters) and the characteristics of the estimation method used. A parametric sensitivity study allows the identification of the dq-axis inductances as the most critical parameters to an accurate correction angle estimation. For this reason, this research thesis is also interested in proposing a methodology to describe the d- and q-axis inductances from FEA simulations performed by considering the anisotropy effects of the magnet and also the saturation of the stator material. A variable reluctance is identified in the machine and its effect on the correction angle is studied

2

Huang, Liren. "Investigation of novel variable flux reluctance machines for traction application". Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/20521/.

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With the increasing concerns about the price of rare-earth material, machines with less or no permanent magnet material have been extensively analyzed for application in electrical vehicles (EVs). As one typical magnetless machine, the variable flux reluctance machine (VFRM) is comprehensively investigated in this thesis in terms of operation principle, stator/rotor pole combination, winding configuration, power factor, current profiling technique, rotor shaping technique and design method.

3

Lee, Beomseok. "Investigation of torque production and control strategy for variable flux reluctance machines". Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/16050/.

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This thesis is focused on the torque production and control strategies of variable flux reluctance machines (VFRMs). Based on energy conservation, an instantaneous torque equation is developed and analysed, which reveals the contributions of harmonic currents and inductances to the torque production. By using Fourier series, all of the harmonics in the phase currents and winding inductances are considered. It was found that the average torque of a 6/4 VFRM is mainly produced by the dc, fundamental and second harmonic components of the phase currents. Based on the derived torque equation, magnitudes and phases of the current harmonics are optimised so that the average torque is maximised under a given rms current. Undesirable level of torque ripple was found, due to the inductance harmonics. The third harmonic torque ripple is dominant in the 6/4 VFRM, whilst the 6/7 VFRM has a lower magnitude sixth harmonic component. In order to reduce the torque ripple, a harmonic field current is injected. Since the torque ripple reduction method utilises the machine parameters, the influence of the parameter mismatch is investigated. The torque waveforms predicted by the derived torque equation are compared with the results directly calculated by 2D-finite element analysis (FEA). Additionally, the experimental results verify that the derived torque equations can predict the torque production of the VFRMs to a good degree of accuracy. In order to improve the machine efficiency and extend the operating speed range, an integrated field and armature current control strategy has been proposed. The field and armature currents are injected into a single coil as a sinusoidal current biased by a dc offset, rather than a separate field and armature winding. In the integrated current control scheme, a zero sequence current generates a virtual rotor flux as the field current, whilst the three-phase sinusoidal currents produce a rotating stator field. The zero sequence current is generated by adjusting the on-time of zero vectors between two inverters. In the case of the 6/4 VFRM, an open winding configuration is utilised since the field and armature windings have the same polarity in each tooth winding. In contrast, a dual three-phase winding configuration having a neutral point is adopted for the 6/7 VFRM, due to the opposite polarity between the field and armature windings. For the vector control, the voltage and torque equations are derived in the synchronous dq-axis frame. With the aid of MATLAB/Simulink, these equations are also utilised for the dynamic simulation. The simulation and experimental results validate that the proposed strategy can effectively increase the efficiency and extend the operating speed range of the VFRMs. As an extended work, a torque ripple reduction method is also applied to the integrated current control by injecting harmonic components into the zero sequence current.

4

Poulot, Patrick. "Contribution à l'étude des machines à réluctance variable et à aimant : structure à concentration de flux". Toulouse, INPT, 1995. http://www.theses.fr/1995INPT090H.

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Ces travaux traitent des machines a aimants permanents et a petits plots magnetiques excites par des bobinages globalises. Dans ces dispositifs, l'echelle geometrique du bobinage est dissociee de l'echelle de repartition des champs au niveau de la denture. Cette topologie permet d'obtenir, a condition d'opter pour des dimensions reduites des plots, des structures a fort couple massique. L'insertion d'aimants permanents dans les systemes de petits plots magnetiques permet d'ameliorer notablement le fonctionnement et autorise ainsi la conception de structures a efforts surfaciques moteurs tres eleves. Nous nous interessons plus particulierement aux caracteristiques des structures a concentration de flux. Ces dispositifs reprennent les concepts utilises pour les machines evoquees precedemment. Les performances intrinseques de telles structures peuvent etre deduites d'une modelisation bidimensionnelle de la cellule elementaire de repetivite du systeme de plots magnetiques. Un calcul de champ par elements finis permet de caracteriser l'influence des parametres geometriques sur l'effort surfacique disponible. Nous montrons que la structure est particulierement adaptee a l'utilisation d'aimants ferrite pour l'obtention de performances elevees. Les calculs seront valides par la realisation d'un prototype experimental. Il s'agit d'un moteur discoide bi-entrefer a aimants ferrite. La machine, d'une puissance de 1 kw, est caracterisee par un couple massique proche de 2 n. M/kg obtenu avec un effort surfacique (effort moteur ramene a la surface d'entrefer) de 1,3 n/cm#2

5

Dahmane, Mansour. "Machine à reluctance variable en fonctionnement moteur/générateur : contribution à l'optimisation de la structure et de l'alimentation". Vandoeuvre-les-Nancy, INPL, 2002. http://www.theses.fr/2002INPL086N.

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Le modèle des Machines à Reluctance Variable à Double Saillance (MRVDS) est établi ; il est basé sur la connaissance d'une fonction analytique représentant le flux en fonction du courant de phase et de la position rotorique, obtenu par éléments finis. Nous proposons une méthode d'interpolation dite de Krigeage dont l'intérêt principal est que la fonction du flux ainsi obtenue est deux fois dérivable par rapport au courant et à la position rotorique. Nous utilisons ce modèle pour calculer les performances, en modes moteur et générateur, de trois MRDVS : triphasée (structure 6/4), tétraphasée (structure 8/6) et pentaphasée (structure 10/8) à courant à d'entrée du convertisseur et à encombrement donnés. Nous établirons que les performances de ces trois machines se dégradent avec l'augmentation de la vitesse de rotation. Pour résoudre ce problème, nous proposons d'alimenter les MRVDS (en fonctionnement moteur et gébérateur) par différentes structures de convertisseurs équipés de survolteurs capacitifs à charge contrôlable
The model of the Switched Reluctance Machines (SRM) is established. It is based on the knowledge of an analytic function of the flux which is calculated using a finite element code. We propose an interpolation method called method of Krigeage to obtain a function of the flux twice derivable according to the phase current and to the position of the rotor. We use this model to calculate the performances, in motor and generator modes, of three machines: three phases (structure 6/4), four phases (structure 8/6) and five phases (structure 10/8) with fixed current of the continuous source and fixed extemal dimensions. We show that the performances of this machines decrease with the speed. To resolve this problem, we propose to feed (in motoring and generating modes) the SRM by several structures of converters which are equipped with different boost capacitor circuit

6

Belhadi, M'hamed. "Étude de machines à réluctance variable pour une application de traction électrique : réduction des ondulations de couple et des efforts radiaux". Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112185.

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Le mémoire traite de la machine à réluctance variable en proposant d'une manière simultanée et du point de vue conception des solutions à ses deux inconvénients majeurs à savoir les ondulations de couple et les efforts radiaux. Les premières se propagent le long de la chaine de transmission diminuant ainsi le confort des usagers et les deuxièmes sont à l’origine d’une nuisance sonore. Dans une première partie et en s’intéressant à une structure axiale caractérisée par une faible force radiale, un bilan sur cette structure est donc établi. En effet, une configuration à deux stators et un rotor est la plus adéquate pour éventuellement remplacer la machine radiale de référence. Cette structure axiale est comparée à cette machine de référence après avoir établi des règles de passage d’une structure à une autre. Un premier passage est effectué en gardant le même encombrement et un deuxième passage en dimensionnant la machine axiale pour satisfaire le même cahier des charges que la machine radiale. Dans une deuxième partie, le travail s’oriente vers la modification de la structure radiale de la machine de référence et son optimisation. Plusieurs modifications sont proposées dont une structure avec une cale magnétique qui est la plus performante. Des optimisations géométriques à l’aide de l’algorithme génétique sur un point de fonctionnement sont ensuite effectuées pour remédier aux deux problèmes. A la fin, un récapitulatif de plusieurs structures optimisées est proposé pour servir de référence. Le choix de la machine la plus adéquate pourra donc être effectué en faisant un compromis entre la maximisation du couple, la réduction de ses ondulations et la réduction des efforts radiaux
This report deals with switched reluctance motor by offering design solutions to the drawbacks of torque ripples and radial forces in the same time. Torque ripples reduce the user comfort and radial forces are the origin of noise. In the first part, an axial structure characterized by low radial force is analysed. Indeed, an axial configuration with two stators and one rotor is the most appropriate to replace the reference radial machine. Ones the rules of passage from one structure to another are established, the axial structure is then compared to the reference one. A first passage is made by keeping the same volume and a second one by sizing the axial machine with the same specifications as the radial one. In the second part, the work concerns the modification of radial structure of the reference machine and its optimization. Several modifications are proposed including a structure with a magnetic wedge which is the most efficient. Geometric optimization using genetic algorithm are then performed on operating points to remedy the both problems. In the end, several optimized structures are proposed. The choice of the most suitable machine can be done by making a compromise between the torque maximization, reducing its ripples and reducing radial forces

7

Zaharia, Mihai Valentin. "Contributions à l’étude des machines à reluctance variable pour application alterno-démarreur automobile". Thesis, Ecole centrale de Lille, 2016. http://www.theses.fr/2016ECLI0022/document.

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Ce travail de recherche est réalisé dans le cadre d'une collaboration internationale entre l'Université Technique de Cluj-Napoca en Roumanie et l'Ecole Centrale de Lille en France. Cette thèse a comme premier objectif, de réduire l’ondulation de couple d’une machine triphasée 6/8 à réluctance variable grâce aux paramètres de contrôle dans le mode de fonctionnement moteur et générateur. Par conséquent, un modèle analytique a été développé et mis en œuvre dans un environnement de calcul numérique. Un outil d'optimisation permettant de trouver les meilleurs paramètres de contrôle a été utilisé. Toutefois, le processus d’optimisation est très lent.En conséquence, une stratégie pour réduire le temps du processus d'optimisation sans abaisser la précision des résultats est proposée. Une stratégie de ‘mapping’ est utilisée entre un modèle grossier mais rapide et un modèle fin mais lent. Un travail est mené sur le choix du modèle grossier, dans le cadre d’un modèle fournissant des valeurs en fonction du temps. Deux stratégies de ‘mapping’ ont été utilisées dans cette thèse : l’‘Output Space Mapping Proportional’(OSMP) et le Manifold Mapping (MM). Ces deux stratégies sont utilisées pour déterminer les paramètres de contrôle optimaux. Le problème d’optimisation est ensuite complété en ajoutant des variables géométriques au processus d’optimisation du contrôle. Les outils développés sont ensuite utilisés dans le cadre du dimensionnement par optimisation d’un alterno-démarreur automobile. Finalement, des expériences et des essais sur un prototype de Machine à RV sont menés afin de valider les résultats du processus d'optimisation en mode moteur et générateur
The switched reluctance machine has a simple construction making it cheaper in execution but one of the drawbacks of this machine is the torque ripple. This thesis had as first target, the usage of an optimization tool to calculate the best control parameters to correct this major drawback in motor and generator operation modes. Hence, an analytical model that takes into account the machine geometry and that is able to be simulated in both operation modes by adjusting the commutation angles was provided and implemented in a calculation environment. The second target of this work is to investigate a method to reduce the optimization time without lowering the accuracy of the results. The strategy used in the optimization process is known in literature as the space mapping technique, more precisely for this thesis output space mapping proportional and manifold mapping were studied. After testing them on a mathematical model it was possible to continue the investigation on defining the optimal control parameters of a three-phases 6/8 SR machine prototype, being able that further to use this strategy in a much complicated process, i.e. defining the right geometry and control of a SR machine to be used in automotive integrated starter alternator systems. The final target of the thesis was to conduct experiments and tests on the existing prototype in order to partially validate the results of the optimization process

8

Djebarri, Sofiane. "Contribution à la modélisation et à la conception optimale de génératrices à aimants permanents pour hydroliennes". Thesis, Brest, 2015. http://www.theses.fr/2015BRES0012/document.

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L'amélioration des performances des chaînes de conversion dédiées à la récupération d'énergie par les hydroliennes est un point particulièrement important pour rendre cette ressource économiquement attractive. La minimisation du coût de l'énergie produite passe nécessairement par une amélioration des performances de la chaîne de conversion électromécanique et une réduction des coûts de maintenance et de production des éléments la constituant. Dans ce contexte particulier, les génératrices à aimants permanents apparaissent particulièrement intéressantes dans la mesure où elles sont bien adaptées à un fonctionnement à basse vitesse et à fort couple. Ceci permet d'éliminer des systèmes mécaniques très complexes, encombrants et exigeants en maintenance, tels que le multiplicateur de vitesse et/ou le système d'orientation des pales. L'objectif de cette thèse est d’explorer un certain nombre de pistes concernant les outils, les concepts et les règles de conception à mettre en oeuvre pour dimensionner une génératrice associée en entraînement direct à une turbine hydrolienne à pas fixe. Les outils mis au point dans ces travaux englobent des modèles multi-physiques intégrés dans une démarche de conception qui se veut la plus globale possible. Cette méthodologie tient compte de la caractéristique de la ressource (courants de marées), de celle de la turbine (hélice), des spécifications de la génératrice à aimants permanents, de la mise en oeuvre d’une stratégie de pilotage associant MPPT et limitation de puissance par défluxage à fort courants de marées, en plus des contraintes liées au convertisseur. L'environnement de conception développé est basé sur un couplage des modèles dans une procédure d'optimisation. Les résultats obtenus mettent en lumière les points clés associés au développement d’une telle génératrice pour un contexte hydrolien
The improvements of marine current turbines drive train are key features to ensure safe operation and to make tidal energy resource cost-attractive. In this context, eliminating mechanical systems that demand high-level of maintenance can be an interesting way to improve the global behavior of tidal turbines. For that purposes, the presented studies focus on design methodologies and concepts of direct-driven generators associated with fixed-pitch turbines. The proposed designs are based on multiphysics models of the generator that are integrated in an optimization process taking into account the drive train environment. For these reasons, several models have been integrated into a global design strategy in order to find solutions that improve marine current turbines performances. This strategy is based on the use of an optimization process that combines electromagnetic model, thermal model, turbine performances model, and tidal resource velocity profile. This methodology integrates also an efficient control strategy based on a maximum power point tracking (MPPT) approach at low tidal speed and a flux-weakening power limitation control at high tidal speed. This control at high tidal velocities is in this work achieved by considering only the generator electrical control without using blade pitching systems. The obtained results highlight trends that could lead to an improvement of the design and they help designers to set relevant technological choices in order to ensure significant cost reduction and highly improve the reliability of marine current turbines

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Yammine, Samer. "Contribution to the Synchronous Reluctance Machine Performance Improvement by Design Optimization and Current Harmonics Injection". Phd thesis, Toulouse, INPT, 2015. http://oatao.univ-toulouse.fr/14555/1/yammine.pdf.

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This thesis is dedicated to the evaluation and the improvement of the synchronous reluctance machine’s performance for variable speed drive applications in general and for automotive applications in particular. The two axes of development are machine design and phase current harmonics injection. The rotor is an important element in the machine design and particular emphasis is placed to the design and evaluation of the rotor for enhancing the machine performance. An analytical procedure is proposed for the rotor design. The rotor elements like the ribs and the bridges that maintain the rotor mechanically strong as well as the q-axis insulation ratio (air-to-steel ratio) are studied. A computer-aided design study based on a parametric optimization problem is presented as well. The main three families of the optimization algorithms are evaluated for the optimization procedure: a gradient-based algorithm (Quasi Newton Algorithm), a non-gradient based non-evolutionary algorithm (Nelder Mead Simplex) and a non-gradient based evolutionary algorithm (Genetic Algorithm). The machine designs based on the analytical procedure and the optimization procedure are both manufactured and tested on a bench. The second axis of study of the thesis is the injection of harmonics in the phase currents of the synchronous reluctance machine. The interaction of current harmonics with the spatial inductance harmonics is studied and formalized for an m-phase machine. Then, the harmonics injection concept is evaluated in the particular case of a 2-phase machine. This study shows the benefi t of harmonics injection in the reduction of the machine torque ripple. A synchronous reluctance machine design is fi nally developed for an automotive application based on parametric optimization of the stator and rotor. This design is evaluated for the electromagnetic specifi cations imposed by a mid-power electric vehicle traction application

Capitoli di libri sul tema "Variable flux memory machines":

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Haithem Lazreg, Mohamed, e Abderrahim Bentaallah. "Improved Direct Torque Control Based on Neural Network of the Double-Star Induction Machine Using Deferent Multilevel Inverter". In Direct Torque Control Strategies of Electrical Machines [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.89877.

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In this chapter, we will compare the performance of a multilevel direct torque control (DTC) control for the double-star induction machine (DSIM) based on artificial neural network (ANN). The application of DTC control brings a very interesting solution to the problems of robustness and dynamics. However, this control has some disadvantages such as variable switching frequency, size, and complexity of the switching tables and the strong ripple torque. A solution to this problem is to increase the output voltage level of the inverter and associate the DTC control with modern control techniques such as artificial neural networks. Theoretical elements and simulation results are presented and discussed. As results, the flux and torque ripple of the five-level DTC-ANN control significantly reduces compared to the flux and torque ripple of the three-level DTC-ANN control. By viewing the simulation results using MATLAB/Simulink for both controls, the results obtained showed a very satisfactory behavior of this machine.

Atti di convegni sul tema "Variable flux memory machines":

1

Yang, Hui, Hao Zheng, Shukang Lyu, Heyun Lin, Zi-Qiang Zhu e Weinong Fu. "Analysis of Flux Regulation Principle in a Novel Hybrid-Magnet-Circuit Variable Flux Memory Machine". In 2019 22nd International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2019. http://dx.doi.org/10.1109/icems.2019.8921563.

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Ma, Huizhen, Heyun Lin e Jiyao Wang. "Identification of VSI Nonlinearity of Variable Flux Memory Machine Based on PM Flux Linkage Disturbance". In 2023 IEEE 6th Student Conference on Electric Machines and Systems (SCEMS). IEEE, 2023. http://dx.doi.org/10.1109/scems60579.2023.10379399.

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3

Yang, Hui, Heyun Lin, Z. Q. Zhu, Keyi Wang, Shuhua Fang, Yunkai Huang e Zhike Xu. "Novel variable-mode partitioned stator switched flux memory machines for automotive traction applications". In 2016 XXII International Conference on Electrical Machines (ICEM). IEEE, 2016. http://dx.doi.org/10.1109/icelmach.2016.7732624.

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4

Xu, Hai, Jian Li, Junhua Chen e Meng Ge. "Design of a Hybrid Magnets Variable Flux Memory Machine Based on Hysteresis Model". In 2019 IEEE International Electric Machines & Drives Conference (IEMDC). IEEE, 2019. http://dx.doi.org/10.1109/iemdc.2019.8785214.

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Xie, Ying, Zhaoyang Ning, Zexin Ma, William Cai e Jingwei Wei. "Design and Research of Novel Variable Flux Memory Motor with Series Hybrid Magnets". In 2020 23rd International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2020. http://dx.doi.org/10.23919/icems50442.2020.9291136.

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Yang, Hui, Hao Zheng, Heyun Lin, Z. Q. Zhu e Shukang Lyu. "A Novel Variable Flux Dual-Layer Hybrid Magnet Memory Machine with Bypass Airspace Barriers". In 2019 IEEE International Electric Machines & Drives Conference (IEMDC). IEEE, 2019. http://dx.doi.org/10.1109/iemdc.2019.8785317.

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7

Zhou, Zicheng, Hao Hua e Bohu Zhang. "Investigation of Variable Flux Memory Machines with Hybrid Connected Delta-Type Permanent Magnets". In 2021 IEEE 4th Student Conference on Electric Machines and Systems (SCEMS). IEEE, 2021. http://dx.doi.org/10.1109/scems52239.2021.9646149.

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8

Zhao, Xifang, Heyun Lin, Wei Liu, Xianxian Zeng e Ya Li. "A New Series Variable Flux Memory Machine with Wide Flux Regulation Range". In 2022 IEEE 20th Biennial Conference on Electromagnetic Field Computation (CEFC). IEEE, 2022. http://dx.doi.org/10.1109/cefc55061.2022.9940719.

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Yang, H., Z. Zhu, H. Lin, S. Fang e Y. Huang. "Comparative study of novel variable-flux memory machines having stator permanent magnet topologies". In 2015 IEEE International Magnetics Conference (INTERMAG). IEEE, 2015. http://dx.doi.org/10.1109/intmag.2015.7156983.

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Hua, Hao, Z. Q. Zhu, Adam Pride, Rajesh Deodhar e Toshinori Sasaki. "Comparative study of variable flux memory machines with parallel and series hybrid magnets". In 2017 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2017. http://dx.doi.org/10.1109/ecce.2017.8096691.

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