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Dissertations / Theses on the topic 'Fractional Slot'

Author: Grafiati

Published: 1 April 2023

Last updated: 31 July 2025

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1

Donaghy-Spargo, Christopher Michael. "Synchronous reluctance motors with fractional slot-concentrated windings." Thesis, University of Newcastle upon Tyne, 2016. http://hdl.handle.net/10443/3486.

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Today, high efficiency and high torque density electrical machines are a growing research interest and machines that contain no permanent magnet material are increasingly sought. Despite the lack of interest over the last twenty years, the permanent magnet-free synchronous reluctance machine is undergoing a revival and has become a research focus due to its magnet-free construction, high efficiency and robustness. They are now considered a potential future technology for future industrial variable speed drive applications and even electric vehicles. This thesis presents for the first time a sy

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2

Fei, Wei-Zhong. "Permanent magnet synchronous machines with fractional slot and concentrated winding configurations." Thesis, Cranfield University, 2011. http://dspace.lib.cranfield.ac.uk/handle/1826/6150.

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The permanent magnet synchronous machines with fractional slot and concentrated winding configuration have been steadily gaining traction in various applications in recent times. This is mainly driven by several advantages offered by this configuration such as high-torque density, outstanding efficiency, and easy and low-cost fabrication. The main focus of this thesis is dedicated to the investigation of three main topologies of fractional-slot and concentratedwinding permanent magnet synchronous machines specifically suited for particular applications. Additionally, the cogging torque and tor

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3

Patel, Vipulkumar. "Novel 6-phase fractional-slot permanent magnet machine for electric vehicle applications." Thesis, University of Sheffield, 2014. http://etheses.whiterose.ac.uk/6144/.

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To tackle the issues concerning the global warming and the international energy security, the only way forward is the wide spread adoption of plug-in electric vehicles (EV) in the transportation industry. High power dense and highly efficient electrical machines pave the way for the swift realization of EV. The research underpinned in this thesis describes the new winding configurations and associated slot-pole combinations for permanent magnet (PM) brushless machines that lead to improved performance and facilitate cost reduction. The current state-of-the-art machine technologies and their to

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4

Wu, Di. "Effect of magnetic saturation in fractional slot PM machines with particular reference to terminal voltage distortion." Thesis, University of Sheffield, 2015. http://etheses.whiterose.ac.uk/9435/.

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5

LI, ZIJIAN. "FRACTIONAL-SLOT CONCENTRATED-WINDING SURFACE-MOUNTED PERMANENT MAGNET MOTOR DESIGN AND ANALYSIS FOR IN-WHEEL APPLICATION." Doctoral thesis, Politecnico di Torino, 2012. http://hdl.handle.net/11583/2497418.

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The study on the driving cycle and powertrain of electric vehicle presents the conclusion that there is a regular working area on efficiency map where electric motor works for the most time. Thus, two motivations are proposed: first, to evaluate the efficiency map of electric motor analytically, second, to design an electric motor whose maximum efficiency area on efficiency map covers its regular working area. To evaluate motor efficiency map, three tasks have to be completed: calculating torque-speed characteristic, calculating losses, studying on motor control strategy. For in-wheel applica

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6

Azar, Ziad. "Electromagnetic performance of fractional slot interior permanent magnet and synchronous reluctance brushless AC machines having non-overlapping concentrated windings." Thesis, University of Sheffield, 2012. http://etheses.whiterose.ac.uk/2839/.

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This thesis investigates the electromagnetic performance of the fractional-slot interior permanent magnet (IPM) and salient-pole synchronous reluctance (SynR) brushless AC machines having non-overlapping concentrated windings, the SynR machines being excited by bipolar AC sinusoidal currents with and without DC bias. The analyses are validated by finite element calculations and measurements. The PM machines with modular stators are often employed to improve the electromagnetic performance and ease the manufacture process, particularly stator winding. The influence of uniform and non-uniform ad

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7

Dai, Pre Michele. "Analysis and design of Fault-Tolerant drives." Doctoral thesis, Università degli studi di Padova, 2008. http://hdl.handle.net/11577/3425500.

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The field of fault-tolerant applications is surely among the most exciting and potentially innovative modern research of the electrical motor where the design is freedom and new solution can be explored. The cost of the permanent magnets and the drives allow to develop new solution, in particular surface mounted permanent magnet machine with fractional-slot winding and reluctance motor assisted from the permanent magnet. The reliability of these machines allows to apply these motors into critical applications where the electrical or mechanical redundancy are required. As regard this argument

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8

BARBINI, NICOLA. "Modellizzazione, progettazione e ottimizzazione di macchine elettriche ad avvolgimenti concentrati." Doctoral thesis, Università degli Studi di Trieste, 2020. http://hdl.handle.net/11368/2960315.

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Negli ultimi anni, le macchine elettriche ad avvolgimenti concentrati hanno ricevuto sempre più attenzioni principalmente per le loro caratteristiche di un elevato rapporto coppia - peso e basso costo di produzione. Per contro, rispetto alle più diffuse macchine ad avvolgimenti distribuiti, sono note per avere un forte contenuto armonico spaziale che può dare origine a vari inconvenienti tra cui aumento delle perdite e forze radiali indesiderate tra rotore e statore (UMP). Nella presente tesi viene presentato un rigoroso metodo di valutazione del contenuto armonico di un avvolgimento concentra

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9

GAMBA, MATTEO. "Design of non conventional Synchronous Reluctance machine." Doctoral thesis, Politecnico di Torino, 2017. http://hdl.handle.net/11583/2669965.

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Synchronous reluctance (SyR) and Permanent magnet Synchronous Reluctance (PM-SyR) machines represent an answer to the growing emphasis on higher efficiency, higher torque density and overload capability of ac machines for variable-speed applications. Their high performance is particularly attractive in electric traction and industry applications. The SyR technology represents a convenient solution to obtain high efficiency machines at reduced cost and high reliability. The manufacturing costs are comparable to other existing technologies such as induction motors. Different SyR and PM-SyR machi

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10

VASCHETTO, SILVIO. "Design and development of permanent magnet synchronous machines shaft-line embedded in aeronautic engines." Doctoral thesis, Politecnico di Torino, 2011. http://hdl.handle.net/11583/2615701.

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Technological advances in the aerospace industry have improved aircraft efficiency and reduced the cost of air transport, leading since 1960 to a continuous growth of the worldwide air traffic. Today it is postulated that also into the foreseeable future both the passenger and cargo air traffic will continue to growth, increasing the CO2 air transport emissions. In this contest, there are many environmental as well as commercial pressures on aircraft manufacturers to improve performances of future aircraft in terms of safety, air pollution, noise and climate change. To achieve these goals, it

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11

Aslan, Bassel. "Conception de Machines Polyphasées à Aimants et Bobinage Concentré à Pas Fractionnaire avec Large Plage de Vitesse." Thesis, Paris, ENSAM, 2013. http://www.theses.fr/2013ENAM0039/document.

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L'objectif de la thèse est la conception d'une machine électrique dédiée à des applications Mild-Hybrid. En assurant certaines fonctionnalités, cette machine permet de réduire la consommation de carburant dans le véhicule et par conséquent réduire la quantité des gaz rejetés. Les contraintes exigées par un tel domaine à la fois pour le couple et la puissance nous amène à étudier les machines synchrone polyphasée à aimants avec un bobinage concentré autour des dents. Cette technologie de bobinage permet d'obtenir des machines de rendement élevé qui sont faciles à fabriquer, réparer et recycler,

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12

Bouldja, Nacera. "Slow Light in a SPS Photorefractive Crystal." Electronic Thesis or Diss., CentraleSupélec, 2020. http://www.theses.fr/2020CSUP0005.

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La lumière lente est le domaine scientifique qui s’intéresse aux processus non linéaires quipeuvent réduire la vitesse du groupe d’une impulsion lumineuse lorsqu’elle se propage dansun milieu. Cette technologie a récemment suscité un grand intérêt pour ses larges domainesd’application tels que le router optique, la photonique non linéaire et la spectroscopie.L’efficacité des systèmes à lumière lente est généralement mesurée par deux paramètresclés : le retard ou la vitesse du groupe et la bande passante de l’impulsion lumineuse desortie. Ce dernier est défini par le retard dit fractionnel qui

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13

Kouevidjin, Modobozi. "Evaluation des performances énergétiques d'une nouvelle génération d'éolienne off-shore." Thesis, Artois, 2015. http://www.theses.fr/2015ARTO0208/document.

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L’alternateur étudié dans cette thèse équipe une éolienne flottante à axe vertical. Il s’agit d’unemachine synchrone de 2MW, polyphasée, bobinée sur plots, à pas fractionnaire, à aimants et à prisedirecte. L’objectif majeur de la thèse est la caractérisation de cet alternateur afin d’en évaluer lesperformances. Une modélisation analytique de la perméance d'entrefer et de la force magnétomotriceont conduit à l'étude de l'induction d'entrefer dont le contenu harmonique s'est révélé êtreparticulièrement riche. La caractérisation a également porté sur la détermination des inductancespropres et mut

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14

Le, Luong Huong Thao. "Optimal Design of Modular High Performance Brushless Wound Rotor Synchronous Machine for embedded systems." Thesis, Toulouse, INPT, 2018. http://www.theses.fr/2018INPT0111/document.

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Cette thèse est dédiée à la conception optimale de la machine synchrone à rotor bobiné modulaire sans balais pour les systèmes embarqués. Cette machine est basée sur une structure POKIPOKITM développée par Mitsubishi Electric Coopération avec les convertisseurs de puissance intégrée pour augmenter la capacité de tolérance aux défauts. L'analyse électromagnétique est utilisée pour étudier les différentes machines synchrones à rotor bobiné et donc, pour sélectionner la structure qui offre la meilleure tolérance aux défauts et les performances les plus élevées. D’abord, le choix des nombres de ph

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15

Mota, Edson Pereira da. "Dinâmica do nitrogênio em função da adubação nitrogenada com ureia." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/11/11140/tde-25072017-171327/.

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O nitrogênio é um dos nutrientes mais importante para o desenvolvimento vegetal e o mais aplicado em diversos cultivos agrícolas. Dentre as fontes nitrogenadas disponíveis, a ureia se destaca pela alta concentração de nitrogênio que remete a diversas vantagens econômicas e operacionais no sistema de produção agrícola. Porém, além da alta propensão a perdas, principalmente por volatilização do gás amônia, tem-se a necessidade do aumento da produtividade de modo ao suprimento da demanda crescente de alimentos, fibras e energia. Considerando estes fatores, uma nova vertente de pesquisa está volta

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16

Marault, Jérôme. "Conception de machines asynchrones triphasées à bobinages statoriques dentaires." Thesis, Lille, 2021. http://www.theses.fr/2021LILUI007.

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Les machines asynchrones (MAS) à cage d’écureuil sont des machines électriques fiables, robustes et à faible coût de fabrication. Pour des raisons historiques et de fiabilité, elles sont principalement dotées de bobinages statoriques distribués. Toutefois, même si ces derniers assurent un fonctionnement très satisfaisant, ils ont des têtes de bobines de longueurs significatives, ce qui engendre des pertes Joule non négligeables. Dernièrement, différents bobinages dentaires avec des têtes de bobines réduites, ont été utilisés dans des machines synchrones avec des performances intéressantes. En

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17

Boulanger, Marine. "Le devenir des liquides au sein de la croûte océanique des dorsales à expansion lente : nouveaux apports de l'étude d'Atlantis Bank (dorsale Sud-Ouest Indienne)." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0030.

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Les processus magmatiques qui régissent l'accrétion crustale au niveau des dorsales médio-océaniques à expansion lente restent à l'heure actuelle mal contraints. Parmi les processus potentiellement impliqués dans l'évolution des réservoirs de magma de la croûte inférieure, les réactions associées à des écoulements poreux réactifs au travers de bouillies cristallines - ou mush - tendent à supplanter les processus classiques de cristallisation simple des magmas. La part de ces processus dans la formation des gabbros cumulatifs de base de croûte est dépendante des modes de migration des liquides,

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18

Ho, Ming-Te, and 何明特. "Design Considerations for Fractional-Slot Permanent Magnet Synchronous Motors." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/56594844591695839229.

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碩士<br>逢甲大學<br>電機工程所<br>97<br>This paper deals with the design of an interior permanent magnet (IPM) synchronous motor for use in electric power steering system. Such an application requires the motor having small volume, high efficiency and low torque ripple. First, three IPM synchronous motor configurations are analyzed and compared. One of them is chosen based on the performance requirement. Second, to enhance the motor performance and reduce the magnet volume, the Taguchi method coupled with the finite element analysis is performed. Finally, the heat transfer analysis of the motor is also c

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19

Fei, W.-Z. "Permanent magnet synchronous machines with fractional slot and concentrated winding configurations." Thesis, 2011. http://dspace.lib.cranfield.ac.uk/handle/1826/6150.

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The permanent magnet synchronous machines with fractional slot and concentrated winding configuration have been steadily gaining traction in various applications in recent times. This is mainly driven by several advantages offered by this configuration such as high-torque density, outstanding efficiency, and easy and low-cost fabrication. The main focus of this thesis is dedicated to the investigation of three main topologies of fractional-slot and concentratedwinding permanent magnet synchronous machines specifically suited for particular applications. Additionally, the cogging torque and tor

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20

SYU, JHIH-SIANG, and 許智翔. "Design and Analysis of a Fractional-Slot Concentrated Surface Permanent Magnet Brushless Motor for Electric Vehicle Applications." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/83499425490622349056.

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碩士<br>逢甲大學<br>電機工程學系<br>104<br>This thesis describes the design and analysis of a 14-pole/12-slot fractional-slot concentrated winding surface permanent magnet motor for electric vehicle applications to satisfy the torque-speed operating range against the New European Driving Cycle (NEDC) and thermal constraints. The specifications of the motor is three-phase, 5 kW at a rated speed of 1350 rpm. The prototype design of the motor is done with the aid of magnetic circuit design software, SPEED, and electromagnetic field analysis based on finite element method software, Flux2D. Results from this s

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21

Harke, Markus. "Bruchlochwicklungen mit einem Wickelschritt von zwei Nuten." 2021. https://tubaf.qucosa.de/id/qucosa%3A76004.

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Der Beitrag stellt Zweischicht-Bruchlochwicklungen mit einem Wickelschritt von zwei Nuten als einen m¨oglichen Kompromiss vor, welcher weniger ohmsche Verluste als bei klassischen verteilten Wicklungen und weniger Ummagnetisierungsverluste als bei Zahnspulenwicklungen ermöglicht. Er diskutiert Entwurf und Eigenschaften solcher Wicklungen f¨ur drei- und sechssträngige Synchronmaschinen anhand ausgewählter Beispiele.<br>This paper presents two layer fractional slot windings with a winding step of two slots as a possible compromise which enables less ohmic loss than classic distributed windings w

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