Дисертації з теми "Fractional Slot"
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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.
Повний текст джерелаFei, 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.
Повний текст джерелаPatel, Vipulkumar. "Novel 6-phase fractional-slot permanent magnet machine for electric vehicle applications." Thesis, University of Sheffield, 2014. http://etheses.whiterose.ac.uk/6144/.
Повний текст джерелаWu, 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/.
Повний текст джерелаLI, 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.
Повний текст джерелаAzar, 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/.
Повний текст джерелаDai, Pre Michele. "Analysis and design of Fault-Tolerant drives." Doctoral thesis, Università degli studi di Padova, 2008. http://hdl.handle.net/11577/3425500.
Повний текст джерелаGAMBA, MATTEO. "Design of non conventional Synchronous Reluctance machine." Doctoral thesis, Politecnico di Torino, 2017. http://hdl.handle.net/11583/2669965.
Повний текст джерелаVASCHETTO, 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.
Повний текст джерелаAslan, 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.
Повний текст джерелаThe aim of this thesis is to design an electrical machine dedicated for Mild-Hybrid applications. By providing certain functionalities, this machine can reduce fuel consumption in the vehicle and therefore reduce the amount of released gases. The challenges imposed by such application on both torque and power lead us to study the multiphase PM machines with concentrated windings. This windings technology provides efficient machines which are easy to manufacture, repair and recycle, but accompanied with a certain level of parasitic effects. In order to find a compromise between these effects and the ability to provide torque, the thesis concerns the study of winding topologies with different Slots/Poles combinations. An analytical model constituting a tool to compare magnet losses between various combinations is developed. Many configurations are compared in order to make the most appropriate choice which minimizes parasitic effects. The rotor topologies that allow the machine to provide a wide speed range are examined, taking into account their role in magnets protection against MMF harmful harmonics. Finally, the exploitation of freedom degree offered by a 5-phases structure is discussed, showing that the torque can be significantly boosted by modifying the rotor structure. The consistency of all analytical studies presented in the thesis is corroborated by finite element models and a prototype measurement
Kouevidjin, Modobozi. "Evaluation des performances énergétiques d'une nouvelle génération d'éolienne off-shore." Thesis, Artois, 2015. http://www.theses.fr/2015ARTO0208/document.
Повний текст джерелаThe studied alternator equips a vertical axis offshore wind turbine. It is a 2MW fractional slotconcentrated winding permanent magnet synchronous polyphase machine, directly connected to bladeturbine. The principal purpose of this thesis consists in characterizing the alternator in order toevaluate its performances. The air gap permeance and the magnemotive force analytical modelingleads to study the air gap flux density and its harmonic content, which is particularly rich. Thecharacterization has also concerned the self and mutual inductance determination, which has requiredstalling the model by exploiting experimental measurements done at standstill. The particularity of thestudied machine leads us to consider an equivalent fictitious winding in order to determine the cyclicalinductances, necessary for the single-phase equivalent scheme establishment. Moreover, the machineback to back functioning has been studied and simulated. This functioning allows testing the machineitself and the other conversion chain subsystems, without using a second machine or blades to drivethe prototype rotor. It offers the possibility to test different types of operating points and to estimatethe power that can produce the studied machine: different operating points scenarios have beensimulated and parameters for tests have been defined. The back to back functioning of a classicalsynchronous machine has been also investigated, with an analytical modeling of the electromagneticphenomena and experimental tests
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.
Повний текст джерелаThis thesis is dedicated to the design and the optimization of modular brushless wound rotor synchronous machine for embedded systems. This machine is constructed based on POKIPOKITM structure with integrated drive electronics. Finite element analysis based optimization becomes more popular in the field of electrical machine design because analytical equations are not easily formalized for the machines which have complicate structures. Using electromagnetic analysis to comparatively study different modular brushless wound rotor synchronous machines and therefore, to select the structure which offers the best fault tolerant capability and the highest output performances. Firstly, the fundamental winding factor calculated by using the method based on voltage phasors is considered as a significant criterion in order to select the numbers of phases, stator slots and poles. After that, 2D finite element numerical simulations are carried out for a set of 15 machines to analyze their performances. The simulation results are then compared to find an appropriate machine according to torque density, torque ripple and machine efficiency. The 7phase/7-slot/6-pole machine is chosen and compared with a reference design surfacemounted permanent magnet synchronous machine in order to evaluate the interesting performance features of the wound rotor synchronous machine. In the second design stage, this machine is optimized by using derivative-free optimization. The objective is to minimize external volume under electromagnetic, thermal and mechanical constraints. Given that an accurate finite element analysis for machine performance takes a long time. Moreover, considering that the average torque can be obtained by simulating the model with only four rotor positions instead of one electric period, optimization strategy is proposed to reduce computational time and therefore, obtain a fast convergence ability by defining relaxed problems which enable minimizing the external volume of the machine under only several constraints such as average torque, torque ripple and copper losses. By testing relaxed problems, two different optimization methods (NOMAD and fmincon) are compared in order to select an appropriate method for our optimization problem. Using NOMAD method based on Mesh Adaptive Direct Search, we achieve optimal results which satisfy all of the constraints proposed. In the third design stage, all constraints are validated by 3D electromagnetic and thermal simulations using finite element and computational fluid dynamics methods. The 3D results show that the average torque obtained is lower than the desired value. By increasing the length of the machine, a new corrected machine is thus obtained. It can be observed that the iron losses obtained in 3D are higher than that in 2D due to the leakage flux in the end-winding. Then, the machine temperature is analyzed by using ANSYS Fluent. Note that the surface temperature is higher than that calculated in the optimization and the coil temperature is 8.48°C higher than the desired value (105°C). However, some dissipation by the shaft and the bearings of the machine are expected to reduce the machine temperature. Finally, a machine prototype is built and some experimental tests are carried out. The results show that the electromotive force has a similar waveform compared to 3D prediction and the difference of the measured and predicted maximum static torques is small
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/.
Повний текст джерелаNitrogen is one of the most important nutrient for plant development and the most applied nutrient in several agricultural crops. Among the available nitrogen sources, urea differ due to the high concentration of nitrogen that result to several economic and operational advantages in the agricultural production system. However, in addition to the high propensity for losses, mainly due to the ammonia volatilization, the need to increase yield in order to supply the growing demand for food, fiber and energy emerge. Considering these factors, a new research area is focused to aggregate technologies to the urea, they call fertilizers with aggregate technology, this type of fertilizers emerges and brings new alternatives about new products available in the market. Based on the above, it was tried to answer the following questions: Does the new technologies applied to urea fertilizer enable the reduction of losses by volatilization? The new technologies applied to urea modify their inorganic and organic transformations in the soil and, if modified, are these positive? Does the use of technologies applied to urea reflect in a longer longevity in the release of the nutrient to the soil and, if so, is this longevity advantageous? Can the combination of conventional urea and aggregate technology products brings more benefits to cons than the application of these alone? Is the substitution of urea in its traditional form by urea with aggregate technology in the maize crop economically viable to the producer? In order to answer these questions, three experiments were conducted: analysis of nitrogen fractions from urea and urea mixed with inhibitors; Dynamics of release and longevity of polymer sulfurcoated fertilizers; Analysis of maize yield submitted to fertilization with polymer and sulfur coated urea. The first experiment allowed concluding that the use of the urea inhibitors has potential to reduce losses by ammonia volatilization, it was possible to verify all the changes undergone by the nitrogen fertilization since the granule until the availability of the mineral forms, including the immobilization of the nutrient in organic matter. In the second experiment, it was concluded that the polymer and sulfur coated fertilizers have exponential dynamics of release, the coating depends on the temperature, soil moisture, type of coating material and coating process (thickness), which directly affects the release and longevity of these fertilizers. The last experiment showed that the use of the coated fertilizers with polymer and sulfur increases the yield, the biometric parameters, the leaf concentration and the quality of grain to the maize crop. The combinations performed between the coated products with conventional urea are alternatives for increasing the yield resulting in higher application values of the inputs in an isolated way. Combinations of coated products with conventional urea is an alternative to reduce investment and consequently the production costs, it will result the adoption of these new technologies.
Marault, Jérôme. "Conception de machines asynchrones triphasées à bobinages statoriques dentaires." Thesis, Lille, 2021. http://www.theses.fr/2021LILUI007.
Повний текст джерелаSquirrel cage induction machines (IM) are reliable, robust and low cost manufacturing electrical machines. For historical and reliability reasons, they are mainly equipped with distributed stator windings. However, even if the latter ensure very satisfactory operation, they have significant end-coils lengths, which generate non-negligible Joule losses. Recently, different fractional slot concentrated windings (FSCW) with reduced end-coils have been used in synchronous machines with interesting performances. In addition to reducing stator Joule losses, these windings enable to design machines that are more compact and fault tolerant. Their use is less common in IM due to the problems induced by spatial harmonics in the magneto motive force when supplied. The aim of this work is to find the best way to use FSCW windings in IM while ensuring good performances. A detailed analysis is first carried out to precisely understand the physical phenomena associated with the use of FSCW in induction machines both in steady state and during start-up. A parametric analytical model of a squirrel cage induction machine was then developed. This model enables to design FSCW windings with a controlled spatial harmonic content but also rotors with different numbers of bars that are equidistant or not. On the basis of this tool, optimizations were carried out both on the stator and its winding and on the rotor structure, showing that it is possible to achieve "uncommon" structures with satisfactory performance. Finally, a fractional slot concentrated winding IM with an innovative rotor cage was developed. Its performance in terms of the developed torque was evaluated through numerical simulations and tests carried out on a prototype
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.
Повний текст джерелаMagmatic processes that govern crustal accretion at mid-ocean ridges still need to be better constrained. Among the processes potentially involved in the evolution of the lower crust magma reservoirs, reactions associated with reactive porous flow through crystal mushes tend to be considered as one of the predominant processes together with simple crystallization of magmas. The share of these processes during magma differentiation is dependent on the modes of melt migration and is thus correlated to the geometry of the reservoirs considered. By combining high-resolution structural, petrographic and geochemical studies of in situ sections drilled in an oceanic core complex of the Southwest Indian Ridge, I was able to bring new constraints on the formation and evolution of magmatic reservoirs involved in crustal accretion. All or part of the igneous reservoir model developed herein can be applied to other sections of lower oceanic crust. This model, together with additional constraints obtained by the coupled experimental petrology study of crystallization processes, paves the way for new quantifications of the involvement of melt-rock reactions in the differentiation of gabbroic lithologies, and more generally in the evolution of melts within the oceanic crust. Those developments are consistent with the constant evolution in recent decades of the understanding of crustal magmatic systems, which shifted from melt-filled magma chambers to igneous reservoir models mostly composed of crystal mushes
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.
Повний текст джерела逢甲大學
電機工程所
97
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 conducted. Results show that the designed fractional-slot IPM synchronous motor meets the specification within the permissible temperature rise.
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.
Повний текст джерелаSYU, 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.
Повний текст джерела逢甲大學
電機工程學系
104
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 study shows that the machine with single-layer winding has higher performance characteristics and is selected for the following study. A sensitivity analysis, Taguchi method and fuzzy Taguchi method is used to the optimal design of the motor for maximum both efficiency and the torque per unit magnet volume and minimum the torque ripple. Finally, a mechanical and a thermal analysis of the motor are also investigated and discussed in this thesis.
Harke, Markus. "Bruchlochwicklungen mit einem Wickelschritt von zwei Nuten." 2021. https://tubaf.qucosa.de/id/qucosa%3A76004.
Повний текст джерелаThis 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 would have and less hysteresis and eddy loss than fractional slot concentrated windings would have. It discusses properties and design of such windings for three- and six-phase synchronous machines based on selected examples.