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Volschenk, Albertus Francois. "Finite element analysis of a salient-pole generator feeding a rectifier load." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307058.
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Nuzzo, Stefano. "On the damper cage of salient-pole synchronous generators." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/49155/.
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In the field of power generation, the wound-field synchronous generator has a well consolidated history of utilisation, mainly due to its proven and excellent performance. Nevertheless, due to the ever-increasing requirements in terms of power quality, efficiency, grid compliance and manufacturing costs, there is interest in renewing the design of this electrical machine, also allowed by the recent advancements in the computational resources. In this thesis, an unconventional, modulated damper cage topology for salient-pole synchronous generators is proposed in order to address the requirements inherent to the power quality (by improving the total harmonic distortion of the output voltage), the efficiency (by reducing the damper cage associated losses) and the manufacturing costs and times (by achieving an un-skewed stator core structure). In order to achieve these objectives, a suite of innovative modelling techniques are proposed and validated in this work, including hybrid numerical/analytical models, a new methodology to model skewing in an accurate and fast manner and specific optimisation methodologies for synchronous generators. In this work, these tools are then used to propose improvements to synchronous generators through new configurations of the damper winding. The thesis focuses on two main platforms, namely 1) a 4MVA generator, where the modulated damper bars are shown to improve the losses and the THD of the system and 2) a 400kVA generator, where it is shown how through a new damper winding configuration, the traditional skewing of the stator can be removed without compromising the machine performance in any way.
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Wallin, Mattias. "Measurement and modelling of unbalanced magnetic pull in hydropower generators." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-196490.
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Hydropower research is often perceived to be an old and exhausted field of study but with ageing equipment and the need for more intermittent operation caused by an increased share of other renewable energy sources new challenges lie ahead. The main focus of this dissertation are the electromagnetic forces resulting from nonuniform air gap flux, whether it be caused by rotor eccentricity or a faulty field winding. Results are predominantly obtained from measurements on an experimental generator and numerical simulations. With the computational capacity available today it is possible to numerically analyse physical phenomena that previously could only be studied with analytical tools. Numerical models can also be expanded to encompass more than one aspect of generator operation in coupled field-circuit models without model complexity surpassing computer capability. Three studies of unbalanced magnetic pull, UMP, in synchronous salient pole generators constitute the main part of this thesis. The first is a study of how parallel stator circuits affect the unbalanced magnetic pull caused by rotor eccentricity. Depending on the relationship between the geometry of the separate circuits and the direction of the eccentricity it was found that parallel circuits could reduce the UMP substantially. Secondly, an investigation of the effect of damper winding configuration on UMP was performed. The results showed that damper winding resistivity and the distance between the damper bars in a pole determine the effectiveness of the damper winding in reducing the UMP. Simulations of a production machine indicate that the reduction can be substantial from damper windings with low resistivity. The third study analyses the consequences of field winding interturn short circuits. Apart from a resulting rotating unbalanced magnetic pull it is found that the unaffected poles with the same polarity as the affected pole experience an increase in flux density. In a fourth article a new stand still frequency response, SSFR, test method including measurements of damper winding voltage and current is presented. It is found that the identified models are capable of predicting the stator to damper transfer function both with and without the damper winding measurements included.
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Alves, Aylton José. "Uma modelagem da máquina síncrona considerando o efeito da curvatura da sapata polar." Universidade Federal de Uberlândia, 2011. https://repositorio.ufu.br/handle/123456789/14278.
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This work develops a new mathematical model to the salient pole synchronous machines
(SPSM), based on the abc reference system. The model considers the distribution
and coil pitch factors of windings and develops a new function for the variable
air gap, generated by the curvature of the polar mass. As a result, the development
of the modeling takes into account the spatial harmonic components of: magneto
motive force MMF(θ)h, electromagnetic
ux density B(θ)h and variation function
of the air gap g(θ)h.
It is also proposed a new and simplied methodology using the locked rotor tests,
volt-ampere method, to obtain the constants of the synchronous machine design,
which allow the calculation of the modeling parameters and the terminals magnitudes
determination. It presents also contributions to traditional methods of obtaining
experimental inductances, using the locked rotor test. Yet it develops procedures
and makes the simulation of the main temporal magnitudes at the generator terminals
connected to the utility grid, electrical torque, speed, voltage and current.
The model is validated through the theoretical and experimental confrontation
of inductances, and also of the voltages and currents at the generator terminals
connected to the utility grid.Este trabalho desenvolve uma nova modelagem matemática para as máquinas síncronas de polos salientes (MSPS), baseada no sistema abc de referência. A modelagem considera os fatores de distribuição e de passo de bobina dos enrolamentos e desenvolve uma nova função para o entreferro variável, gerado pela curvatura da sapata polar. Como conseqüência o desenvolvimento da modelagem leva em consideração os componentes harmônicos espaciais de: força magneto motriz FMM(θ)h, densidade de uxo eletromagnético B(θ)h e da função de variação do entreferro g(θ)h. É também proposto uma nova e simplificada metodologia a partir dos testes de rotor bloqueado, método volt-ampere, para a obtenção das constantes de projeto da máquina síncrona que possibilitam os cálculos dos parâmetros da modelagem, bem como a determinação das grandezas terminais. Também apresenta contribuições aos métodos tradicionais de obtenção de indutâncias experimentais, a partir dos testes de rotor bloqueado. Ainda desenvolve os procedimentos e faz a simulação das principais grandezas temporais nos terminais do gerador conectado à rede da concessionária: torque elétrico, velocidade, corrente e tensão. A modelagem é convalidada através das confrontações teórico-experimental das indutâncias, e também dos resultados de correntes e tensões nos terminais do gerador conetado à rede da concessionária.
Doutor em Ciências
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Sousa, Neto Cecilio Martins de. "Estabilizador de sistema de pot?ncia para m?quinas s?ncronas de polos salientes utilizando a transformada Wavelet." Universidade Federal do Rio Grande do Norte, 2013. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15474.
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Previous issue date: 2013-07-05Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico
The power system stabilizers are used to suppress low-frequency electromechanical oscillations and improve the synchronous generator stability limits. This master thesis proposes a wavelet-based power system stabilizer, composed of a new methodology for extraction and compensation of electromechanical oscillations in electrical power systems based on the scaling coefficient energy of the maximal overlap discrete wavelet transform in order to reduce the effects of delay and attenuation of conventional power system stabilizers. Moreover, the wavelet coefficient energy is used for electric oscillation detection and triggering the power system stabilizer only in fault situations. The performance of the proposed power system stabilizer was assessed with experimental results and comparison with the conventional power system stabilizer. Furthermore, the effects of the mother wavelet were also evaluated in this work
Os estabilizadores de sistemas de pot?ncia s?o empregados para suprimir oscila??es eletromec?nicas, de baixa frequ?ncia, e estender os limites de estabilidade de geradores s?ncronos. Prop?e-se nesta disserta??o de mestrado um estabilizador de sistema de pot?ncia baseado nas wavelets, composta por uma novametodologia para extra??o e compensa??o de oscila??es eletromec?nicas em sistemas el?tricos de pot?ncia baseada nas energias dos coeficientes de aproxima??o da transformada wavelet discreta redundante, com o objetivo de reduzir os efeitos de atraso e atenua??es dos estabilizadores de sistemas de pot?ncia convencionais. Por outro lado, as energias dos coeficientes wavelet s?o utilizadas para detec??o das oscila??es el?tricas e habilita??o do estabilizador de sistema de pot?ncia proposto apenas nas situa??es de falta. A efic?cia do desempenho do estabilizador de sistema de pot?ncia proposto foi comprovada por meio de resultados experimentais, cujo desempenho foi comparado com o desempenho do estabilizador de sistema de pot?ncia convencional. Al?m disso, os efeitos das wavelets m?es tamb?m foram avaliados
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Carolino, Su?lio Fernandes. "Regulador autom?tico de tens?o robusto utilizando t?cnicas de controle adaptativo." Universidade Federal do Rio Grande do Norte, 2013. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15466.
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Previous issue date: 2013-02-01Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico
The stability of synchronous generators connected to power grid has been the object of study and research for years. The interest in this matter is justified by the fact that much of the electricity produced worldwide is obtained with the use of synchronous generators. In this respect, studies have been proposed using conventional and unconventional control techniques such as fuzzy logic, neural networks, and adaptive controllers to increase the stabilitymargin of the systemduring sudden failures and transient disturbances. Thismaster thesis presents a robust unconventional control strategy for maintaining the stability of power systems and regulation of output voltage of synchronous generators connected to the grid. The proposed control strategy comprises the integration of a sliding surface with a linear controller. This control structure is designed to prevent the power system losing synchronism after a sudden failure and regulation of the terminal voltage of the generator after the fault. The feasibility of the proposed control strategy was experimentally tested in a salient pole synchronous generator of 5 kVA in a laboratory structure
A estabilidade de geradores s?ncronos conectados a rede el?trica tem sido objeto de estudo e investiga??es durante anos. O interesse por este assunto ? justificado pelo fato de grande parte da energia el?trica produzida no mundo ser obtida com a utiliza??o de geradores s?ncronos. Nesse aspecto, muitos trabalhos t?m sido propostos utilizando t?cnicas de controle convencional e n?o convencional como l?gica fuzzy, redes neurais e controladores adaptativos visando aumentar a margem de estabilidade do sistema quando ele est? sujeito a falhas s?bitas e dist?rbios transit?rios. Este trabalho apresenta uma estrat?gia de controle robusta n?o-convencional para a manuten??o da estabilidade dos sistemas de pot?ncia e regula??o da tens?o de sa?da de geradores s?ncronos conectados ? rede el?trica. A estrat?gia de controle utilizada ? composta pela integra??o de uma superf?cie deslizante com um controlador linear. Esta estrutura de controle contribui para a preven??o dos sistemas de pot?ncia de perder o sincronismo ap?s uma falha s?bita e regula??o da tens?o terminal do gerador ap?s a falta. A viabilidade da estrat?gia de controle proposta foi testada experimentalmente em um gerador s?ncrono de p?los salientes de 5 kVA em uma estrutura de laborat?rio
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Oliveira, José Mário Menescal de. "Efeitos da operação do gerador de indução no comportamento do gerador síncrono operando em um sistema isolado alimentando cargas não lineares." Universidade Federal de Goiás, 2018. http://repositorio.bc.ufg.br/tede/handle/tede/8878.
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This thesis demonstrates the effects of harmonic pollution in a salient pole synchronous generator and an induction generator operating in parallel on an isolated system, supplying a non-linear load. The main contributions of this research-study consist of identifying and quantifying the oscillations that non-linear load cause on the electric variables of synchronous and induction generators, such as, the electromagnetic conjugate that presents oscillations of sixth harmonic due to the distorted currents.
Este trabalho mostra os efeitos da poluição harmônica em um gerador síncrono de polos salientes e um gerador de indução operando em paralelo em um sistema isolado suprindo carga não linear. As principais contribuições deste trabalho consistem em identificar e quantificar as oscilações que a carga não linear utilizada provoca nas variáveis elétricas dos geradores síncronos e dos geradores de indução, tal como, o conjugado eletromagnético que apresenta oscilações de sexto harmônico devido as correntes distorcidas.
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Park, Doh Young. "Parameter identification of salient-pole synchronous machines using the SSFR, standstill frequency response, test." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq20579.pdf.
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Mohamodhosen, Bibi Safoorah Bilquis. "Optimisation topologique de dispositifs électromagnétiques." Thesis, Ecole centrale de Lille, 2017. http://www.theses.fr/2017ECLI0028/document.
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L’Optimisation Topologique (OT) est un sujet en plein essor qui suscite l’intérêt de nombreux chercheurs depuis ces deux dernières décennies dans le domaine de l’électromagnétisme. L’OT représente une méthode très attrayante et originale car elle permet de trouver des structures innovantes sans aucun a priori. Ce travail de thèse est orienté vers l’OT des dispositifs électromagnétiques en approfondissant plusieurs aspects du sujet. Tout d’abord, un outil d’OT est développé et testé, à partir des outils existant au L2EP. En effet, l’OT requiert un outil d’éléments finis et un outil d’optimisation devant être couplés. Une méthodologie originale d’OT fondée sur les principes de la Méthode de Densité est développée et testée. Un cas test académique est utilisé afin de tester et valider le couplage des outils et la méthodologie. Une approche visant à prendre en compte le comportement non-linéaire des matériaux ferromagnétiques avec nos outils OT est également mise en place. Ensuite, la méthode est appliquée afin d’optimiser un électroaimant en 3 dimensions, représentant un cas test proche de la réalité. Ce cas test permet de comparer les résultats avec un comportement linéaire et non-linéaire des matériaux. Diverses topologies sont présentées, par rapport aux différentes formulations du problème. Par la suite, la méthodologie est appliquée à un dispositif électromagnétique plus complexe : une Génératrice Synchrone à Pôles Saillants. Cet exemple nous permet de voir comment la définition du problème d’optimisation peut grandement affecter les résultats d’OT. Quelques topologies sont présentées, et leur faisabilité est analyséeTopology Optimisation (TO) is a fast growing topic that has been sparking the interest of many researchers for the past two decades in the electromagnetic community. Its attractiveness lies in the originality of finding innovative structures without any layout a priori. This thesis work is oriented towards the TO of electromagnetic devices by elaborating on various aspects of the subject. First of all, a tool for TO is developed and tested, based on the ‘home-made’ tools available at the L2EP. As TO requires a FE and an optimisation tool working together, a coupling is done using both. Furthermore, a TO methodology is developed and tested, based on the Density Method. An academic cubic test case is used to carry out all the tests, and validate the tools and methodology. An approach is also developed to consider the nonlinear behaviour of the ferromagnetic materials with our TO tools. Afterwards, the methodology is applied to a 3D electromagnet, which represents a more real test case. This test case also serves to compare the results with linear and nonlinear behaviour of the materials used. Various topologies are presented, for different problem formulations. Subsequently, the methodology is applied to a more complex electromagnetic device: a Salient Pole Synchronous Generator. This example allows us to see how the problem definition can largely affect TO results. Some topologies are presented and their viability is discussed
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Okuma, Shigeru, Shinji Doki, and Takumi Ohnuma. "Extended EMF Observer for Wide Speed Range Sensorless Control of Salient-pole Synchronous Motor Drives." IEEE, 2010. http://hdl.handle.net/2237/14475.
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Masoud, Mahmoud Ibrahim. "Decoupled control of rotor torque and rotor electric power in a salient pole, synchronous machine." Thesis, Heriot-Watt University, 2003. http://hdl.handle.net/10399/389.
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Felicetti, Roberto. "Voltage Transients in the Field Winding of Salient Pole Wound Synchronous Machines : Implications from fast switching power electronics." Licentiate thesis, Uppsala universitet, Elektricitetslära, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-434652.
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Wound Field Synchronous Generators provide more than 95% of the electricity need worldwide. Their primacy in electricity production is due to ease of voltage regulation, performed by simply adjusting the direct current intensity in their rotor winding. Nevertheless, the rapid progress of power electronics devices enables new possibilities for alternating current add-ins in a more than a century long DC dominated technology. Damping the rotor oscillations with less energy loss than before, reducing the wear of the bearings by actively compensating for the mechanic unbalance of the rotating parts, speeding up the generator with no need for additional means, these are just few of the new applications which imply partial or total alternated current supplying of the rotor winding. This thesis explores what happens in a winding traditionally designed for the direct current supply when an alternated current is injected into it by an inverter. The research focuses on wound field salient pole synchronous machines and investigates the changes in the field winding parameters under AC conditions. Particular attention is dedicated to the potentially harmful voltage surges and voltage gradients triggered by voltage-edges with large slew rate. For this study a wide frequency band simplified electromagnetic model of the field winding has been carried out, experimentally determined and validated. Within the specific application of the fast field current control, the research provides some references for the design of the rotor magnetic circuit and of the field winding. Finally the coordination between the power electronics and the field winding properties is addressed, when the current control is done by means of a long cable or busbars, in order to prevent or reduce the ringing.
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Kendeck, Clement Ndjewel. "Fault ride-through capability of multi-pole permanent magnet synchronous generator for wind energy conversion system." Thesis, Cape Peninsula University of Technology, 2019. http://hdl.handle.net/20.500.11838/3060.
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Thesis (MEng (Electrical Engineering))--Cape Peninsula University of Technology, 2019Wind has become one of the renewable energy technologies with the fastest rate of growth. Consequently, global wind power generating capacity is also experiencing a tremendous increase. This tendency is expected to carry on as time goes by, with the continuously growing energy demand, the rise of fossil fuels costs combined to their scarcity, and most importantly pollution and climate change concerns. However, as the penetration level increases, instabilities in the power system are also more likely to occur, especially in the event of grid faults. It is therefore necessary that wind farms comply with grid code requirements in order to prevent power system from collapsing. One of these requirements is that wind generators should have fault ride-through (FRT) capability, that is the ability to not disconnect from the grid during a voltage dip. In other words, wind turbines must withstand grid faults up to certain levels and durations without completely cutting off their production. Moreover, a controlled amount of reactive power should be supplied to the grid in order to support voltage recovery at the connection point. Variable speed wind turbines are more prone to achieve the FRT requirement because of the type of generators they use and their advanced power electronics controllers. In this category, the permanent magnet synchronous generator (PMSG) concept seems to be standing out because of its numerous advantages amongst which its capability to meet FRT requirements compared to other topologies. In this thesis, a 9 MW grid connected wind farm model is developed with the aim to achieve FRT according to the South African grid code specifications. The wind farm consists of six 1.5 MW direct-driven multi-pole PMSGs wind turbines connected to the grid through a fully rated, two-level back-to-back voltage source converter. The model is developed using the Simpowersystem component of MATLAB/Simulink. To reach the FRT objectives, the grid side controller is designed in such a way that the system can inject reactive current to the grid to support voltage recovery in the event of a grid low voltage. Additionally, a braking resistor circuit is designed as a protection measure for the power converter, ensuring by the way a safe continuous operation during grid disturbance.
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Kronberg, Anders. "Design and Simulation of Field Oriented Control and Direct Torque Control for a Permanent Magnet Synchronous Motor with Positive Saliency." Thesis, Uppsala universitet, Elektricitetslära, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-176343.
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The researchers at the Department of Electricity at Uppsala University has recently entered the field of electric motor design, however no real knowledge of motor control of salient pole permanent magnet motors exists in the department. This thesis will present a general description of the control method of motors that exist today, this has been done by reviewing existing literature. The literature review has shown that there are at least three control methods with a significant different in their control approach, Scalar-, Field Oriented- and Direct Torque- Control. The two last methods were chosen by the author as the most useful and was implemented and simulated together with the newly developed motor in MATLAB Simulink to evaluate their performance. The simulation results show that there is no difference in performance of the two methods, but they show a difference in efficiency. The results show that it's worth to develop both methods further, mainly for reducing the torque and current ripple. This result was not expected according to literature, which suggests that the Field Oriented Control has a lower torque ripple. This could be caused by the choice of hysteresis control for inverter switching, instead of more sophisticated methods with a proportional integral derivative controller (PID) together with Sinusoidal Pulse Width Modulation (SPWM) or Space Vector Modulation (SVM).
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Örn, Markus. "Towards Better Alternator Efficiency." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-109098.
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The requirements on vehicle industry are constantly getting stricter, especially when it comes to emissions. At the same time cars, trucks and buses are needed for our way of living. This have forced companies to be as ecient as possible in their way of using fossil fuels for travelling and transport. To increase the eciency companies investigate all possible fuel savings to decrease their carbon footprint as much as possible. One area of savings that is not that obvious to many people is the alternator. Several percent of the total energy used by a vehicle are needed to operate the alternator. With a typical alternator eciency of 70% considerable savings can be achieved. This thesis that concern alternator eciency was carried out at Scania in Södertälje, Sweden. The goal of the thesis is to construct a mathematical model of an alternator. The model is supposed to consider all losses in the alternator and together with the output power give an eciency model of the alternator at different speeds and loads. A great part of the project has been dealing with the magnetic losses. The magnetic losses have been modeled as an equivalent circuit with the load angle as a central piece. The equivalent circuit is built up by the fact that the alternator used in the vehicles is a salient pole alternator. The equivalent circuit describes a voltage equation where the voltage drop over the magnetic inductance is described. From that relations between the signals in the alternator and output signals can be written. The alternator model is then used together with data recorded from different buses all over the world, this to be able to investigate how the alternator contributes to the fuel consump- tion depending on the way that the buses are driven. The result of this thesis is a mathematical model that describes the losses in the alternator for different load cases and speeds.
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Harnisch, Philipp, Martin Eckart, and Thomas Schuhmann. "Asymmetrische Polanordnung als fertigungsoptimierte Methode der Nutrastmomentreduzierung am Beispiel eines permanentmagnetisch erregten Synchrongenerators für Kleinwindenergieanlagen." TU Bergakademie Freiberg, 2019. https://tubaf.qucosa.de/id/qucosa%3A38465.
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In diesem Beitrag wird eine fertigungsoptimierte Methode der Nutrastmomentreduzierung durch Magnetverschiebung am Beispiel eines Synchrongenerators für Kleinwindenergieanlagen mit in die Läuferoberfläche eingelassenen Permanentmagneten vorgestellt. Auf Grundlage der Drehfeldtheorie wird ein analytisches Berechnungsmodell unter Einbezug der Magnetverschiebung zur Bestimmung des Nutrastmoments entwickelt und mit FEM-Simulationen verifiziert. Durch experimentelle Untersuchung eines gefertigten Prototyps wird der optimierende Effekt der Magnetverschiebung nachgewiesen und mit einem Referenzläufer mit ungeschrägt, symmetrisch verteilten Polen verglichen. Abschließend werden mögliche Ursachen für die verbleibenden Abweichungen identifiziert und Ansätze für die weiteren Betrachtungen abgeleitet.A production-optimized method of reducing cogging torque by magnet shifting using the example of a synchronous generator for small wind turbines with a rotor with inset surface magnets is proposed in this paper. On the basis of rotating field theory an analytical calculation model is developed taking into account the magnet shifting for determination of cogging torque. The analytical results are verified with FEM simulations. By experimental investigation of a manufactured prototype, the optimizing effect of magnet shifting is verified and compared to a rotor with symmetrically distributed poles. Finally, possible reasons for remaining discrepancies are identified and approaches for further considerations are presented.
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Devornique, Geoffrey. "Modélisation et optimisation d’un alterno-démarreur synchrone à griffes pour l’application « mild-hybrid »." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0173/document.
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Les travaux de recherches menés dans cette thèse concernent la modélisation et l’optimisation de l’alternateur synchrone à griffes utilisé dans les véhicules mild-hybrid. Ce dernier voit son utilisation élargie à la fonction d’assistance de traction au moteur thermique et de récupération d’énergie dans les phases de freinage. La structure spéciale du rotor rend nécessaire l’utilisation de modèles éléments finis 3D pour modéliser finement les effets tridimensionnels. Ces derniers requièrent une utilisation intensive des ressources informatiques (RAM, temps CPU) qu’il est crucial de réduire pour envisager une démarche d’optimisation de dispositifs magnétiques. Dans ce contexte, l’utilisation d’une plateforme de modélisation ouverte Gmsh et GetDP, permettant l’implémentation de géométries et de formulations appropriées, a abouti au développement de modèles précis et suffisamment rapides pour être intégrés dans des algorithmes d’optimisation. L’originalité de cette démarche de modélisation consiste à hybrider une approche numérique (éléments finis 3D) et une approche semi-analytique (réseau de perméances) de sorte que l’usage des éléments finis 3D soit réduit aux zones où le champ magnétique est tridimensionnel. Enfin, le choix d’un algorithme d’optimisation adapté aux modèles numériques (boîte noire à fort coût d’évaluation) a permis de développer un outil de pré-dimensionnement et de dimensionnement des machines synchrones à griffes en vue de l’obtention d’une géométrie optimisée en réponse à un cahier des charges industrielThe research work carried out in this thesis concerns the modeling and optimization of claw-pole synchronous alternator used in mild-hybrid vehicles. The use of this machine is extended to assistit traction engine and energy recovery in the braking phases. The special structure of the rotor makes it necessary to use 3D finite element models to analyse efficiently the three-dimensional effects, which requires an intensive use of computing resources (RAM, CPU time). The latter must be reduced in order to consider an optimization process on such magnetic devices. In this context, the use of a Gmsh and GetDP, open modeling platform, led to the development of precise models, fast enough to be integrated into optimization algorithms. The originality of this modeling approach is based on the hybridization of a numerical approach (3D finite elements) and a semi-analytical approach (permeance network) so that the use of 3D finite elements is reduced to areas where The magnetic field is three-dimensional. Finally, the choice of an optimization algorithm adapted to numerical models (black box with high evaluation cost) allows to develop a pre-design and a design tools for claw-pole synchronous machines in order to obtain an optimized geometry achieving an industrial specification
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Khlaief, Amor. "Contribution à la commande vectorielle sans capteur mécanique des machines synchrones à aimants permanents (MSAP)." Phd thesis, Aix-Marseille Université, 2012. http://tel.archives-ouvertes.fr/tel-00814276.
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Ce travail de recherche s'intéresse à la commande sans capteur mécanique du moteur synchrone à aimants permanents (MSAP) à pôles saillants, particulièrement en basse vitesse, avec détection de la position initiale du rotor. Après une présentation des techniques et approches qui ont initié nos travaux, en terme d'estimation de la vitesse et/ou de la position, nous avons choisi celles qui présentent plus d'intérêt de point de vue stabilité, robustesse, précision et simplicité d'implémentation. La première approche est basée sur le Système Adaptatif avec Modèle de Référence (MRAS). Quant à la deuxième, elle est réalisée autour d'un observateur non-linéaire pour l'estimation de la position et de la vitesse du MSAP à pôles saillants. Les deux techniques d'observation de la vitesse sont associées à une commande par orientation du flux rotorique avec la technique MLI vectorielle. Pour détecter la position initiale du rotor, nous avons utilisé une nouvelle approche qui permet d'estimer cette position avec une incertitude de 5° mécanique. Cette nouvelle approche est basée sur l'application de signaux tests aux bornes des phases statoriques du MSAP. Des résultats de simulation et expérimentaux sont présentés tout au long de ces travaux pour valider les études théoriques de la commande vectorielle sans capteur mécanique du MSAP. Enfin, nous avons étudié et analysé les performances de la commande tolérante aux défauts sans capteur mécanique du MSAP en présence de défaillances de types transistors à l'état-off. Les résultats expérimentaux obtenus avec les deux approches d'estimation de la vitesse en utilisant l'observateur MRAS et un observateur non linéaire ont permis d'améliorer la fiabilité du système de manière à rendre possible la commande vectorielle sans capteur mécanique en mode dégradé (alimentation avec deux bras de l'onduleur). En effet, les résultats de la commande sans capteur mécanique de la MSAP en mode dégradé montrent que l'observateur non linéaire est le mieux adapté pour ce type de fonctionnement car il présente de faible ondulation du couple et de vitesse. A l'aide d'un banc d'essais que nous avons développé au laboratoire LSIS-pôle Ecole Centrale de Marseille (ECM), nous avons pu valider expérimentalement les différentes approches proposées dans ce travail de recherche. Les résultats obtenus montrent l'efficacité des techniques mises en œuvre pour la commande vectorielle sans capteur mécanique du MSAP à pôle saillant en termes de robustesse, stabilité, précision et rapidité.
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Dittman, William B. "Simulation of a self-excited single-phase salient pole synchronous generator with asymmetric stator windings." 1989. http://catalog.hathitrust.org/api/volumes/oclc/19977638.html.
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Thesis (M.S.)--University of Wisconsin--Madison, 1989.Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaf 99).
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Πέτρου, Στυλιανός. "Διερεύνηση ηλεκτρομαγνητικής και μηχανικής συμπεριφοράς σύγχρονης μηχανής με τη χρήση μοντέλου πεπερασμένων στοιχείων." Thesis, 2010. http://nemertes.lis.upatras.gr/jspui/handle/10889/3616.
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Σκοπός της παρούσας διπλωματικής εργασίας είναι η ανάλυση της λειτουργίας τριφασικής σύγχρονης γεννήτριας εκτύπων πόλων κατά την εκκίνηση, καθώς και την ηλεκτρομαγνητική μελέτη ενός συστήματος δύο βαθμών ελευθερίας (στρόβιλος-γεννήτρια). Τέλος, θα γίνει σχολιασμός των αποτελεσμάτων.The aim of the thesis is to study and analyze the operation of three phase synchronous generators with salient poles at startup, and electromechanical advancement of a system of two degrees of freedom (turbinegenerator) which is oscillated. Comments of the findings will follow in the last chapter. The thesis is structured in five chapters. Chapter 1 introduces the literature review where there is a general description of the basics of electric energy and the principles regarding the construction and operation of synchronous machines and in particular three-phase synchronous machines with salient poles. In chapter 2, a comprehensive analysis of oscillating systems is made of one and two degrees of freedom. A comparison is then made between linear and rotary motion. In the end the mathematical model of a rotating part with two degrees of freedom and the constant of twisted spring is presented. Chapter 3 shows the main steps followed during the design stage of the model and it includes images of the main parts of the generator and the control windows of the software Opera-2d. In Chapter 4 we make a reference to the PI-controller which was used to control the speed of the generator. Then we give the parameters of analysis. In Chapter 5 shows the presentation of the simulation results during the startup of the synchronous generator until the steady state.
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RAN, LI-RONG, and 冉立榮. "Survey on dynamic characteristic of salient pole synchronous motor." Thesis, 1989. http://ndltd.ncl.edu.tw/handle/64773144166894270041.
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chuang, chih juang, and 莊志榮. "Design and implementation of speed control system for salient-pole synchronous motor." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/44736001093637318108.
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碩士國立臺灣科技大學
電機工程系
87
The aim of the thesis is to design and implement the salient-pole synchronous motor speed servo drive system and to improve its efficiency. The essential part of determining the initial as well as the instantaneous rotor positions are conducted by using the feedback values from the line voltages and the incremental speed encoder. The rotor speed and position obtained are then used to determine the voltage command for the close-loop control system. The overall system is composed of a speed and two current controllers, and a sinusoidal pulse-width modulated inverter. The speed controller adopts the proportional-integral control technique, while the current regulator uses the decoupled current controller and the voltage command compensator. Excellent Performance concerning speed, torque, current and efficiency through the proposed scheme. The system realized can also be operated in the constant hose-power region where field-weakening is introduced. Accurate torque control and efficiency improvement in this region are resulted by appropriately adjusting the input as well as the field currents. Experiments are given to justify the analysis.
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Schiferl, Rich. "Design considerations for salient pole, permanent magnet synchronous motors in variable speed drive applications." 1987. http://catalog.hathitrust.org/api/volumes/oclc/17958443.html.
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Thesis (Ph. D.)--University of Wisconsin--Madison, 1987.Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 449-464).
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Subramanian, Jayaram. "Estimating the magnetic characteristics of a salient pole synchronous machine using ampere turns distribution method." Thesis, 2015. http://hdl.handle.net/1828/6445.
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Modeling of electrical machines play a very important role in a variety of applications such as performance analysis, characterization, fault diagnosis, condition monitoring and stress analysis of the machines. One of the important parameter while modeling the electrical machine is the magnetic characteristics of the core material. This plays a huge role in the performance characteristics and analysis of the electrical machines. Existing techniques available to determine the magnetic characteristics of a material are mainly Epstein and single sheet tester. These two tests are invasive and destructive method of testing the magnetic characteristics of the material. This research work takes up this problem and comes with a simple yet effective solution to determine the average magnetic characteristics of the material in the salient pole synchronous machine (SPSM). An FE model of the SPSM was developed to closely emulate the characteristics of the experimental machine. This FE model was first subjected to magnetostatic simulation under different field currents using a known magnetic material. Ampere turn distribution technique was used to determine the magnetic characteristics of the material. Following the determination of the new material, this material was used in the FE simulation of the SPSM running as a motor and a generator under varying load condition and field currents. Then these results were compared with the real machine to determine the effectiveness of the developed scheme.Graduate
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Doorsamy, Wesley. "Methods for condition monitoring and fault diagnosis on a synchronous 2 pole generator." Thesis, 2013. http://hdl.handle.net/10539/12829.
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In order to increase the integrity of existing generation systems, it is essential to discover
problems well in advance. An investigation into methods for diagnosing multiple incipient
faults on a 2-pole synchronous generator is presented. Simulation of the generator on a
finite element analysis (FEA) software package is used to predict the effects of these
faults. Experimental analysis of the generator under fault conditions is then conducted
and confirms the predicted behaviour. The investigation utilises search coils and shaft
brushes as condition monitoring tools. Results of the investigation indicate definitive
relationships between the faults and specific harmonics of the output signals from the
condition monitoring tools. The presented techniques are viable and future work can
utilise these results in the design of a fault diagnosis system.
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He, Shi-Bin, and 何世賓. "Design and Implementation of Optimal Efficiency and High-Speed Control for Salient-Pole Permanent-Magnet Synchronous Motors." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/44037652838469990332.
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碩士國立臺灣科技大學
電機工程系
88
Abstract This thesis presents the analysis and implementation of a high-efficiency, wide-speed control system for salient-pole permanent-magnet synchronous motors. The saliency of permanent-magnet motor yields larger quadrature-axis inductance than that of the direct-axis. This results in reluctance torque accordingly. By appropriately adjusting the direct-axis current, the reluctance torque can be controlled to achieve high-efficiency operation. In addition, field-weakening is also exercised to extend speed control range with constant DC-link voltage. The proposed control strategy will not only yield optimal efficiency but also result in the immunity of performance to the variation of machine parameters. A digital signal processor (DSP TMS320F240) is used to implement digitized control of the proposed system for cost reduction and reliability enhancement. Experimental evaluation for a 1-hp drive system has been conducted. The result indicates that the efficiency can be raised to as high as 89% under rated torque, while the operating speed can be extended to 2.65 times the rated speed at no-load.
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Jain, Amit Kumar. "Control Of High Power Wound Field Synchronous Motor Drives - Modelling Of Salient Pole Machine, Field Oriented Control Using VSI, LCI And Hybrid LCI/VSI Converters." Thesis, 2010. http://etd.iisc.ernet.in/handle/2005/1985.
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This thesis proposes control schemes and converter configurations for high power wound field synchronous motor (WFSM) drives. The model for a salient pole WFSM in any general rotating reference frame is developed which can be used to derive models along known rotor (dq) and stator flux (MT) reference frames. Based on these models, the principle of sensor-less stator flux oriented field-oriented control (FOC) for salient pole WFSM is developed. So far in the literature, control of cylindrical rotor machine only has been addressed and the effects of saliency have generally been neglected. The performance of the proposed sensor-less FOC has been demonstrated by experimentally operating a 15.8 HP salient pole WFSM using a three-level IGBT based voltage source inverter (VSI).
The principle of FOC has been later extended to the control of current source load
commutated inverter (LCI) fed salient pole WFSM drives, where the drawbacks present in conventional self-control method such as rigorous off-line calculation for generation of look up tables, coupling between flux and torque control etc. are eliminated.
This thesis also proposes the combination of a VSI with the LCI power circuit to overcome the different disadvantages that are present in the existing LCI topology. Firstly, a novel starting scheme is proposed, where the LCI fed WFSM is started with the aid of a low power auxiliary VSI converter in a smooth manner with sinusoidal motor currents and voltages. This overcomes the difficulties of the present complex dc link current pulsing technique that has drawbacks such as pulsating torque, long starting time etc. In a second mode of operation, it is shown that the VSI can be connected to the existing LCI fed WFSM drive as a harmonic compensator in On-The-Fly mode; this will make the terminal stator current and voltage sinusoidal apart from cancellation of torque pulsations thus improving the drive performance. The above two schemes have potential as retrofit for existing drives.
It is possible to combine both the advantages, mentioned above, by permanently connecting the VSI with the LCI power circuit to feed the WFSM. This proposed hybrid LCI/VSI drive can be regarded as a universal solution for high power synchronous motor drives at all power and speed ranges.