Rozprawy doktorskie na temat „Rotating electrical machines”
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Hargreaves, Philip Alexander. "Advanced performance prediction tools for the analysis of rotating electrical machines". Thesis, University of Newcastle upon Tyne, 2015. http://hdl.handle.net/10443/2853.
Pełny tekst źródłaHusain, Tausif. "Rotating Reference Frame Control of Switched Reluctance Machines". University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1375286539.
Pełny tekst źródłaChong, Yew Chuan. "Thermal analysis and air flow modelling of electrical machines". Thesis, University of Edinburgh, 2015. http://hdl.handle.net/1842/10466.
Pełny tekst źródłaChapariha, Mehrdad. "Modeling alternating current rotating electrical machines using constant-parameter RL-branch interfacing circuits". Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/45565.
Pełny tekst źródłaOLIVO, MATTEO. "Efficient Methods for the Study of Eddy-Currents Effects in Medium-Voltage Rotating Electrical Machines". Doctoral thesis, Università degli Studi di Trieste, 2020. http://hdl.handle.net/11368/2960316.
Pełny tekst źródłaThe efficient computation of eddy-current effects in medium voltage electric machines is discussed in this dissertation. Two particular cases are considered. Firstly, the effects of shaft eddy-currents on two-pole induction motor performance is addressed, with special focus on the power factor. In the second part of the thesis the start-up calculation of a large synchronous motor with solid rotor is analyzed. For each application a special calculation procedure is introduced. These procedures adopt a set of suitable finite-element models to properly compute the machine equivalent circuit parameters that are mainly influenced by eddy-current-related phenomena. By suitably choosing finite-element models boundary conditions and excitations their geometry is simplified to the maximum possible extent, in order to reduce the computational burden. The results of the new calculation methods are compared with experimental data and with analogous results obtained from commonly-adopted calculation procedures. The comparison proves that the proposed approaches can lead to high accuracy levels with very remarkable computational savings.
Carraro, Enrico. "Analysis and design procedures of permanent magnet machines for hybrid electric vehicles and rail-traction applications". Doctoral thesis, Università degli studi di Padova, 2017. http://hdl.handle.net/11577/3421927.
Pełny tekst źródłaNegli ultimi anni l'interesse nel settore delle macchine sincrone a magneti permanenti ha riscontrato una notevole crescita. Questo e' stato determinato principalmente da importanti sviluppi nel campo della progettazione delle macchine elettriche, nei sistemi di controllo e nelle tecnologie dei magneti permanenti. Questi fattori hanno reso possibile la progettazione di macchine elettriche con elevata densita' di coppia, densita' di potenza, rendimento, basso costo unitamente ad ampi gradi di liberta' nella geometria e struttura della macchina. Tali requisiti sono fortemente ricercati nel campo automotive, soprattutto a seguito dell'introduzione di sempre piu' stringenti normative sull'efficienza energetica e sulle emissioni atmosferiche inquinanti. Questi aspetti hanno accelerato la transizione da sistemi di mobilita' tradizionali con motori a combustione interna a veicoli ibridi-elettrici e puramente elettrici, nella produzione industriale di massa. Inoltre, ulteriori requisiti, specialmente in macchine da trazione ed ausiliarie ad alte prestazioni, quali ad es. motori per servosterzo elettrico, stanno attualmente diventando sempre piu' importanti. Prestazioni in deflussaggio, qualita' della coppia (coppia di impuntamento ed oscillazione della coppia), smagnetizzazione, prestazioni acustiche e robustezza delle configurazioni devono essere tenute in conto, insieme a stringenti vincoli dimensionali, elettrici e termici tipici di azionamenti elettrici compatti ed integrati. A causa dell'incremento significativo ed instabilita' dei prezzi delle terre rare, della criticita' dei loro approvvigionamenti ed i relativi impatti ambientali, soluzioni prive di terre rare pesanti, senza terre rare od addirittura senza magneti permanenti, sono fortemente ricercate nel settore automotive. La principale tematica di ricerca di questo dottorato riguarda lo sviluppo di innovative procedure di analisi e sintesi di macchine sincrone a magneti permanenti per applicazioni automotive. Queste ultime spaziano da sistemi ausiliari a bassa coppia / bassa potenza, nella fattispecie motori per servosterzo elettrico, fino a applicazioni at alta coppia / alta potenza, quali ad es. motori da trazione. Questo lavoro fornisce una valutazione complessiva di differenti tipologie di macchine. Particolare attenzione e' dedicata allo studio di soluzioni con magneti permanenti privi di terre rare pesanti ed allo sviluppo di procedure di ottimizzazione ad elementi finiti ed analitiche della geometria del motore. Come menzionato precedentemente, tali metodologie tengono in considerazione numerosi vincoli elettromeccanici e differenti obiettivi. Per quanto riguarda le macchine da trazione, la ricerca si e' focalizzata sulla topologia di motori a riluttanza assistiti da magneti permanenti. L‘interesse attorno a tali macchine e' cresciuto negli ultimi anni soprattutto a seguito della crisi dei prezzi dei magneti permanenti a terre rare. Infatti, tali macchine rappresentano una soluzione alternativa a basso costo rispetto a motori a magneti permanenti tradizionali a causa di importanti vantaggi tecnici quali ad es. un ampio regime di velocita', competitivi valori di densita' di coppia ed efficienza, elevata capacita' di sovraccarico ed una robustezza della struttura. D'altra parte, uno dei principali svantaggi e' rappresentato dall'elevata oscillazione della coppia. Nel campo dei motori per servosterzo elettrico, differenti topologie, sia dotate di rotore isotropo che anisotropo ed equipaggiate con avvolgimenti concentrati, sono state valutate. Alcune nuove configurazioni, che sfruttano il principio della riluttanza e della concentrazione di flusso, sono introdotte, ottimizzate per mezzo di procedure ad elementi finiti ed infine validate per mezzo di misure sperimentali, includendo valutazioni delle prestazioni acustiche e quelle dei magneti permanenti. Ulteriori considerazioni sono tratte per quanto concerne la robustezza delle soluzioni nei confronti delle imperfezioni costruttive. Rispetto alle macchine isotrope, tali configurazioni sviluppano una densita' di coppia piu' alta, esibiscono un piu' ampio intervallo di velocita', maggiore rendimento raggiungendo un qualita' della coppia e prestazioni acustiche competitive ad un costo inferiore e con una buona semplicita' costruttiva. Esse si dimostrano, pertanto, dei candidati ottimali per applicazioni automotive ad alte prestazioni.
Nøland, Jonas Kristiansen. "A New Paradigm for Large Brushless Hydrogenerators : Advantages Beyond the Static System". Doctoral thesis, Uppsala universitet, Elektricitetslära, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-317780.
Pełny tekst źródłaBarsoum, Nader N. "Analysis and computation of instability mechanisms in rotating electrical machinery". Thesis, University of Newcastle Upon Tyne, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328149.
Pełny tekst źródłaDupont, Préscillia. "Texturisation laser sélective des aciers électriques orientés et non orientés pour l'optimisation de leur perméabilité et des pertes dans les machines électriques tournantes". Electronic Thesis or Diss., Amiens, 2022. http://www.theses.fr/2022AMIE0065.
Pełny tekst źródłaSoft ferromagnetic materials, which are often used in the form of laminated sheets, compose rotating electrical machines' stators and rotors. The efficiency of those machines is reduced by losses called "iron losses", induced by magnetization mechanisms and eddy currents. Those magnetization reversal mechanisms can only be explained with the magnetic structure coupled to the material geometry, anisotropy and surface texture, which are also deterministic factors for the final electromagnetic performances. Then, present work aims at proposing tailor-made soft ferromagnetic materials by means of selective laser texturizing for electromagnetic devices such as rotating electrical machines. To apply such a process at an industrial level for grain-oriented and non-grain-oriented materials in electrical machines, it is necessary to better control the associated technology and specify the process in order to optimize electromagnetic properties. Indeed, the deterministic impact of this technic on a material's magnetic structure and its performances (magnetic permeability and iron losses) remains partially modelled and understood. The integration of such solution at the industrial scale must be analyzed and optimized regarding technical and economical constraints. In this work, the study of the impact of laser surface texturizing on magnetic structure (regarding surface and volume) of a material with the aim to control it is performed. Future industrialization requires to adapt the pulsed laser processes at a higher speed which has been theoretically studied, initiated and experimentally verified. To finish, present work performed in parallel with the H2020 European project ESSIAL will allow to propose different surface treatments adapted to rotating machines to adjust some quantifiable electromagnetic properties with the help of both experimental and theoretical tools
Chauvicourt, Fabien. "Vibro-acoustics of rotating electric machines: Prediction, Validation and Solution". Doctoral thesis, Universite Libre de Bruxelles, 2018. https://dipot.ulb.ac.be/dspace/bitstream/2013/271049/4/thesis.pdf.
Pełny tekst źródłaDoctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
Drennan, Duncan Scott. "Design of a passive rotor transverse flux rotating machine". Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/50313.
Pełny tekst źródłaThesis (MScEng)--University of Stellenbosch, 2005.
ENGLISH ABSTRACT: The transverse flux machine (TFM) offers the opportunity of high torque to volume ratios which makes it an excellent candidate for direct wheel drives and low speed generator applications. TFMs have a three dimensional flux path which eliminates iron laminates as a viable core material. Soft magnetic composites have been adopted in these machines due to their isotropic nature. There are three main variants of TFMs, namely, active rotor (with magnets on the rotor), passive rotor (with magnets on the stator), and reluctance (with no magnets). As a relatively recent development in electrical machines, the TFM still has many hurdles facing its adoption in industry. Some of these hurdles are high cogging torque, a difficult construction, and expensive materials. This thesis focuses on the design of a three phase 50 kW passive rotor machine. Finite element simulation is used to determine the optimal configuration, and the final machine is analysed in detail. The construction process and associated problems are also detailed. The completed machine did not perform to the desired specification, but much knowledge was gleaned about the TFM, the construction caveats, and future potential directions.
AFRIKAANSE OPSOMMING: Die transversale-vloed masjien (TFM) met sy hoe draaimoment tot volume verhouding, is 'n uitstekende kandidaat vir direkte wiel aandrywing en lae spoed generator toepassings. Die vioed pad van die masjiene is drie-dimensioneel, wat yster laminasies as kern materiaal elimineer. "Soft magnetic composites" kan gebruik word vir hierdie masjiene as gevolg van hulle isotropiese eienskappe. Daar bestaan drie hoof variante van die TFM, naamlik, die aktiewe rotor (met magnete op die rotor), passiewe rotor (met magnete op to stator), en reluktansie (sonder magnete). Die TFM is 'n redelike nuwe tipe masjien en daar is nog probleme wat opgelos moet word voordat die industrie sal begin om dit te gebruik. Van hierdie probleme is "cogging" draaimoment, 'n moeilike konstruksie en duur materiale. Die fokus van hierie tesis is op die ontwerp van 'n 50 kW drie-fase passiewe rotor masjien. Eindige element simulasie is gebruik om die optimale konfigurasie te kry, en 'n analise is gedoen op die finale masjien. Die konstruksie proses en die probleme wat daarmeer saam gaan is ook beskryf. Die prototipe masjien wat gebou is het nie aan sy oorspronklike spesifikasie voldoen nie, maar baie kennis is opgedoen oor die TFM, die konstruksie proses, en potensiele toekomende toepassings.
JUNIOR, HELIO DE PAIVA AMORIM. "A STUDY RELATED WITH THE ISOLATION CONDITION OF HIGH TENSION ROTATING ELECTRIAL MACHINES". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1997. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=7578@1.
Pełny tekst źródłaO Monitoramento do Sistema de Isolamento em Máquinas Elétricas de Alta Tensão representa um avanço no que diz respeito ao planejamento operacional de uma indústria. Com posse de dados on-line referentes às condições apresentadas pelos isolamentos, as devidas precauções podem ser tomadas, evitando danos maiores. O trabalho apresentado tem como objetivo principal analisar um sistema de monitoramento desenvolvido pela CEA (Canadian Electrical Association), com suporte técnico da Ontario Hydro. O sistema chamado PDA (Partial Discharge Analyzer) mede, através de acopladores permanentes ou portáteis (capacitores), as Descargas Parciais nos enrolamentos estatóricos de grande máquinas de alta tensão. A quantificação exata das Descargas Parciais são indicadas das reais condições do isolamento. A análise do aparelho foi realizada em conjunção aos dados obtidos, tendo como referência a Companhia Siderúrgica Nacional (CSN). A partir de tais dados, é possível demostrar em que estágio atual de aproveitamento estamos em relação à utilização de tal aparelho e quais são os passos futuros para melhor compreensão das medidas.
The Monitoring of te Isolation System in High Tension Electrical Machines represents na advance in what concerns the operational planning of na industry. Knowing the on- line data referring to the conditions presented by the isolations, the necessary cautions can be taken, avoiding bigger damages. This work has as the main aim to analyze a monitoring system developed by the CEA (Canadian Electrical Association). The system is called PDA ( Partial Discharge Analyzer) and measures, through permanent or portable couplers (capacitors), the Partial Discharges is indicator of the isolation real conditions. The appliance analyses was made with the obtained data, having as reference the CSN. With this data, it is possible to show in what profiting stage of appliance and which are the future steps for a better comprehension of the measures.
Ipurale, Andrew. "Condition monitoring and fault detection of inverter-fed rotating machinery". Master's thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/25278.
Pełny tekst źródłaObaid, Ramzy R. "Detection of rotating mechanical asymmetries in small induction machines". Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/13527.
Pełny tekst źródłaLawler, Clinton T. (Clinton Thomas). "A two-phase spherical electric machine for generating rotating uniform magnetic fields". Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/39839.
Pełny tekst źródłaThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 133-138).
This thesis describes the design and construction of a novel two-phase spherical electric machine that generates rotating uniform magnetic fields, known as a fluxball machine. Alternative methods for producing uniform magnetic fields with air-cored solenoidal magnets are discussed and evaluated. Analytical and numerical models of these alternatives are described and compared. The design details of material selection, slot geometry, and mechanical connections are described for the fluxball machine. The electrical properties of the machine are predicted and measured. Based on these properties, two modes of operation for the fluxball machine, normal and resonant, are described, and reference tables of important operating parameters are given. The drive and measurement circuitry for the fluxball machine are described. The magnetic properties of the fluxball machine are measured using Hall effect sensors. The calibration of two different Hall effect sensors is performed, providing the ability to measure the magnetic fields accurately to ±1%. Measurements of the magnetic field in the uniform field region are taken and compared with predicted values. The attenuation and distortion of the magnetic fields due to diffusion through the inner fluxball winding is measured as a function of operating frequency.
(cont.) Finally, future uses of this machine for various applications are discussed. The fluxball machine provides uniform fields in the inner volume and point magnetic dipole fields in the exterior volume. Both regions are extremely useful for conducting controlled magnetic fields experiments. The fact that the machine can produce rotating fields of these types makes it particularly useful for applications in ferrofluid research and in experimental research related to large rotating machinery.
by Clinton T. Lawler.
S.M.
Nav.E.
Lawler, Clinton T. "A two-phase spherical electric machine for generating rotating uniform magnetic fields". Thesis, Monterey, California. Naval Postgraduate School, 2007. http://hdl.handle.net/10945/2995.
Pełny tekst źródłaContract number: N62271-97-G-0026
US Navy (USN) author.
Garibaldi, Michele. "Laser additive manufacturing of soft magnetic cores for rotating electrical machinery : materials development and part design". Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/52326/.
Pełny tekst źródłaHalligan, Gary. "Fault detection and prediction with application to rotating machinery". Diss., Rolla, Mo. : Missouri University of Science and Technology, 2009. http://scholarsmine.mst.edu/thesis/pdf/Halligan_09007dcc80708356.pdf.
Pełny tekst źródłaVita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed November 25, 2009) Includes bibliographical references.
O'Leary, Beth Andrews. "Analysis of high-speed rotating systems using Timoshenko beam theory in conjunction with the transfer matrix method /". Online version of thesis, 1989. http://hdl.handle.net/1850/10608.
Pełny tekst źródłaKohutek, Tomáš. "Diagnostika vibrací strojů při kusových zkouškách". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318531.
Pełny tekst źródłaFarah, Philippe-Siad. "Étude de la réduction des vibrations des machines synchrones". Grenoble INPG, 1995. http://www.theses.fr/1995INPG0087.
Pełny tekst źródłaBruguier, Cyrille. "Commande d'une machine synchrone à aimants sans capteur mécanique". Grenoble INPG, 1996. http://www.theses.fr/1996INPG0133.
Pełny tekst źródłaMcKinnon, Douglas John Electrical Engineering & Telecommunications Faculty of Engineering UNSW. "Novel efficiency evaluation methods and analysis for three-phase induction machines". Awarded by:University of New South Wales. Electrical Engineering and Telecommunications, 2005. http://handle.unsw.edu.au/1959.4/21869.
Pełny tekst źródłaLe, Coat Gwenaëlle. "Discrétion électromagnétique des machines électriques tournantes". Grenoble INPG, 1997. http://www.theses.fr/1997INPG0108.
Pełny tekst źródłaEvery electrical machine produces electromagnetic stray fields. Those fields have low values in term of classical electrotechnics, but in other applications they seem high, like for example in magnetic detection. In this way the aim of this thesis is the reduction of electromagnetic stray fields of electrical machines. An experimental set has been installed. It allows to study, with a great accuracy, the electromagnetic signature of machines and tbe influence of sorne elements as the presence of end shields, and the rotor. The effect of eccentricity has been shown in a purpose of machine safety and maintenance. Numerical models have been developed. The 2D model gives only qualitative results because of its hypothesis : end windings not taken Înto account and infinite length of the machine. The 3D model is able to represent physical phenomena outside the machine. A simple analytical model is also described in this thesis. It is based on the representation by equivalent magnetic dipoles. It helps to understand the signature of the machines. Finally, thanks to those models, solutions for stray fields reduction, as an active shielding, have been considered, after a review of the present usual solutions
Holmberg, Pär. "Modelling the transient response of windings, laminated steel coresand electromagnetic power devices by means of lumped circuits : With special reference to windings with a coaxial insulation system". Doctoral thesis, Uppsala University, Department of High Voltage Research, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-548.
Pełny tekst źródłaElectromagnetic transients impinging on electromagnetic power devices - such as electric machines, transformers and reactors - can stress the design severely. Thus the magnitudes of the transients are often decisive for the design of the devices. Further, the operation of a device can be transient in itself. This is the case for the explosive magnetic flux compression generator (EMG) and a ferromagnetic actuator.
Models are presented that are mainly intended for transients in the millisecond range and faster. Hence, eddy currents and the related skin and proximity effect become significant in windings, magnetic cores and in the armatures of the devices. These effects are important for, e.g., the damping of the transients. Further, the displacement current in the insulation of the winding is significant. It changes the response of the windings dramatically, as it manifests the finite velocity of propagation of the electromagnetic fields. Under such circumstances, reflections and excited resonances can make the transient voltage and current distribution highly irregular.
Induced voltages are modelled with self and mutual inductances or reluctances combined with winding templates. The displacement currents are modelled with capacitances or coefficients of potential. Cauer circuits and their dual form are used to model eddy currents in laminated cores and in conductors. The Cauer circuit enables one to consider hysteresis and the non-linear response of a magnetic core. It is also used to model the eddy currents in the moving armature of an EMG.
A set-up is presented that can be used to study the transient voltage and the current distribution along a coil.
The transient response of coaxially insulated windings is analysed and modelled in detail. A lumped circuit model is developed for a coil, DryformerTM - the new high-voltage transformer - and PowerformerTM, the new high-voltage generator. An alternative model, a combined lumped circuit and FEM model, is presented for a coaxially insulated winding in two slot cores.
Jandaud, Pierre-Olivier. "Étude et optimisation aérothermique d'un alterno-démarreur". Thesis, Valenciennes, 2013. http://www.theses.fr/2013VALE0018/document.
Pełny tekst źródłaThe goal of this thesis is the aero-thermal study and optimization of a starter-alternator used in hybrid cars. This kind of machines being more powerful than a regular alternator, their cooling is critical. The machine is modeled using lumped method in steady state which uses networks of thermal conductances. The inputs for the model are obtained using correlations from bibliography for the convective heat transfers and three dimensional CFD for the flow rates inside the machine. The numerical results are validated by experimental results with PIV for the fluid results and a machine fitted with thermocouples for the thermal part. In the second part, the thermal code is coupled with an optimization algorithm to obtain an optimal geometry of the machine from a thermal point of view. The method chosen is Particle Swarm Optimization (PSO). The parameters are the sizes of the end-windings, the positions of the fans and the cross section of the rotor channels. For different objectives, different optimal geometries are obtained. The last part of this work aims at the multi-objectives optimization of a heat sink located at the back of the machine. The heat sink has to be thermally efficient but should not affect the flow. Different shapes of fins are also studied
Pavlík, Josef. "Vybrané problémy s diagnostiky izolačních systémů točivých elektrických strojů". Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-233987.
Pełny tekst źródłaDonát, Martin. "Komplexní analýza modálních vlastností elektrických strojů točivých". Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-234347.
Pełny tekst źródłaMontasser, Yuseph. "Design and Development of a Power Modulator for Insulation Testing". Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/2895.
Pełny tekst źródłaAbboud, Rita. "Méthode de mesure sans contact de la température intégrée au rotor d’une machine électrique tournante au moyen d’une fibre optique à réseaux de Bragg". Thesis, Compiègne, 2021. http://www.theses.fr/2021COMP2645.
Pełny tekst źródłaIn the transportation system domain, heating problems appear with the temperature increase in different types of electrical machines. In the classical design of electrical machines, thermal analysis should be considered in the initial design, control and monitoring of electrical machines. The measurement of local temperature especially in the rotor is important for several reasons such as extending the lifetime of the electrical machine components, and localizing the hot spots inside the machine which allows the development of appropriate cooling systems and protects the machine. Numerous approaches for temperature measurement can be used such as thermocouples, thermistors, infrared sensors or infra-red cameras. This thesis presents a non-contact technique that measures the temperature of the rotor of a small machine using Fiber Bragg Gratings (FBGs) sensor. Monitoring local temperature especially inside the rotor is important in order to detect early thermal aging of the machine. Hot spot in the rotating parts can be localized by using this technique. The main originality of the proposed work is measuring high temperatures (70°C) with high speed of rotation (860 RPM) of rotating machines and most importantly integrating the FBG sensor into a geometrically small scale electrical rotor of vehicles. The FBG sensor response has been simulated using Transfer matrix method (TMM). After that, the FBG has been calibrated from 20 °C to 70 °C using a heating furnace fabricated at our laboratory. A small rotating machine with embedded FBG has then been designed and fabricated. The temperature of the rotor has been changed while rotating the machine and wavelength shifts due to temperature variations have been experimentally measured up to 860 RPM. A temperature sensitivity of 4.7 pm/°C have been experimentally reached. The ability of this sensor to monitor real time temperature variations of the rotor has been experimentally validated
Spornic, Sorin Aurel. "Automatisation de bancs de caractérisation 2D des tôles magnétiques : influence des formes d'onde sur les mécanismes d'aimantation". Phd thesis, Grenoble INPG, 1998. http://www.theses.fr/1998INPG0154.
Pełny tekst źródłaThe aim of this dissertation is the study of soft magnetic materials under arbitrary vector 2D excitation, turning into the sheet plane. Such conditions appear, for example, inside rotating electric machines or inside three-phase transformers. Previous work has used simplified flux density paths, such as circles or ellipsis covered at constant angular speed, that cannot completely describe the materials'behaviour. The first part of this work was accomplished by the élaboration of a complète 2D magnetic characterisation device. The two RSST of LEG received a computerised driving System (CDS), which clearly improved the measurements accuracy and stability and enlarged the frequency domain. The CDS digital waveform control part allowed for the first time the obtention of complex flux density paths. Finally, the measurement System was completely automated. Thanks to the CDS, the investigation of some soft magnetic materials, such as NiFe, CoFe and NO SiFe, was realised. - First, thèse three materials were characterised under circular flux. The magnetic behaviour was studied with respect to flux and frequency level and also the réversible behaviour, in order to get an anisotropy image. The complète atypical losses évolution could be seen in this manner in the case of NiFe, and a prédiction model was validated. The vector law B(H) was also analysed and a model for the field strength évolution was attempted. - Then this study was enlarged to waveforms observed inside a three-phase induction motor. A2D losses estimation was tested. Finally, the importance of the derivative of the flux density vector with respect to time was highlighted on the magnetic behaviour and the magnetic losses development
Rybnikář, Petr. "Matematický model zátěžového pracoviště točivých elektrických strojů". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-449715.
Pełny tekst źródłaPerrin-Bit, Rémy. "Modélisation des machines électriques tournantes par la méthode des éléments finis tridimensionnels : calcul des grandeurs magnétiques avec prise en compte du mouvement". Grenoble INPG, 1994. http://www.theses.fr/1994INPG0091.
Pełny tekst źródłaSikora, Michal. "Inovace systému chlazení točivých elektrických strojů s využitím CFD metod". Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-233962.
Pełny tekst źródłaDERISZADEH, ADEL. "Analysis, modeling and excitation control of three-stage brushless starter-generators for aircraft applications". Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2712202.
Pełny tekst źródłaPařízek, Daniel. "Návrh algoritmu výpočtu rotoru elektrického stroje s ohledem na napěťově deformační poměry a kritické otáčky". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401514.
Pełny tekst źródłaMaalouf, Haddad Amira. "Sensorless control of brushless synchronous starter generator including sandstill and low speed region for aircraft application". Thesis, Cachan, Ecole normale supérieure, 2011. http://www.theses.fr/2011DENS0008.
Pełny tekst źródłaAujourd'hui, l'aviation est en train de vivre des évolutions technologiques concernant surtout l'attribution de différentes fonctionnalités aux équipements électriques et ceci au détriment d'équipements hydrauliques et mécaniques assurant les mêmes fonctionnalités.Dans le cadre de l'avion plus électrique, le démarrage électrique sans capteurs mécaniques de la turbine de l'avion préoccupe les avionneurs de nos jours. Les problèmes introduits par ce capteur ont été identifiés : problèmes de coût et de poids, problèmes de fiabilité et d'intégration.Ce travail présente alors une commande sans capteurs pour la machine synchrone à trois étages à utiliser durant le démarrage électrique de l'avion. Ceci est réalisé avec trois méthodes de détection de la position selon la vitesse de rotation, basées sur :- l'injection d'un signal à haute fréquence- l'utilisation d'un filtre de Kalman étendu FKE- les fém. du PMG (Permanent Magnet Generator) La première méthode donne de bons résultats d'estimation depuis l'arrêt jusqu'à 8% de la vitesse nominale de la machine. Au-delà de cette vitesse, es valeurs des fém. du PMG deviennent assez élevées pour être utilisées dans l'estimation de la position. De bons résultats sont obtenus à moyenne et haute vitesse.Pour des questions de redondance, le FKE est aussi utilisé. Ainsi, la position estimée peut être fournie par l'un des deux algorithmes à moyenne et haute vitesse.L'implémentation de ces algorithmes est réalisée via une carte FPGA étant donné que celui-ci garantit un temps d'exécution. La rapidité de traitement garantit une estimation de la position quasi-instantanée et donc n'introduit pratiquement pas des retards dans l'estimation
Prokop, Jan. "Analýza účinků zkratového proudu v rozváděči". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221261.
Pełny tekst źródłaProcházka, Jan. "Izolační systémy elektrických strojů malého a nízkého napětí". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-399552.
Pełny tekst źródłaHuang, Ting-cheng, i 黃錠城. "A Simple Partial Discharge Detector for Low-Voltage Rotating Electrical Machines". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/29619747962216661730.
Pełny tekst źródła國立成功大學
電機工程學系碩博士班
95
In this paper, we develop a simple detection circuit which using the acoustic emission (AE) technique to examine partial discharge (PD) signals from low-voltage rotating electrical machines. Most of traditional PD measurement methods use electrical techniques, namely, capacitive coupling (CC), RLC circuit, or high-frequency current transformer (HFCT), to examine the high-frequency electrical signals produced by partial discharge. To reduce the effect of noise from environment and improve the signal-to-noise ratio (SNR), higher frequency detectors are used. However, it means the cost of hardware and instruments will increase. The frequency of signals from AE measurements is in the range from several kHz to hundreds kHz. It is much lower than the signal frequency of electrical methods (several hundred MHz). So, the AE method can substantially reduce the cost of the whole system. In additional, since AE signal is acoustical, it can be easily kept away from the interference of high frequency electrical noises. From the practical experiment results, the measurement system developed in this work can be used to detect the PD-AE signal correctly. When compare with traditional methods, the AE technique exhibits a potential for low-cost PD measurement.
Ling-ChihWei i 魏伶芷. "Rotating Electrical Machines Defect Signal Measurement and Analysis Using Acoustic Emission Method". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/mesc7f.
Pełny tekst źródła國立成功大學
電機工程學系
102
In this thesis, an acoustic emission (AE) sensor was used to capture signals from defects in rotating electrical machines. The captured signals are often blurred by noises; therefore, to identify the defect signals, they are differentiated from noise by using wavelet analysis (WA) methods. The signal processing system developed in this study incorporates two types of wavelet analysis methods: the wavelet packet method and wavelet denoise method. In addition, fast fourier transform (FFT) is adopted to obtain the frequency distribution of defect signal data, and the defect signals are displayed in 3D space by using PD patterns. An identification system that can distinguish the defective parts of rotating electrical machines is constructed. The effectiveness of the system is analyzed by comparing the experimentally measured defect signal data from three defective parts of rotating electrical machine (e.g., the rotor, stator and shaft). The consistency of the analysis results is verified by conducting experiments on several rotating electrical machines.
(9179804), Daniel Christopher Horvath. "Analysis and Design of Electric Machines Using 2D Method of Moments". Thesis, 2020.
Znajdź pełny tekst źródłaChen, Jiun-Yo, i 陳俊佑. "Fault Diagnosis Using Electrical Signal for Rotating Electrical Machinery". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/mbntv4.
Pełny tekst źródła正修科技大學
電機工程研究所
100
The thesis proposes artificial neural network (ANN) to a fault diagnosis system for rotor electrical machinery. The operation of machinery will generate mechanical vibration. However, it may be a fault signal when the vibration become abnormal enlarged. The research use rotor perturbation system of rotor machinery to simulate the fault signal and use triaxial accelerometer to measure the signal. The frequency domain signal can be obtained by Fourie transformation. After sorting the eigenvalue of frequency spectrum, the signal can be used as training data for ANN. The current harmonic signal and mechanical vibration signal are used in the thesis to ANN for fault diagnose. The trained ANN is used for diagnosis fault type of rotor machinery. There are 11 fault signal simulated in the thesis by the rotor simulation system for the fault forecasting system. The results show that vibration and current harmonic signal both have excellent diagnosis outcome.
Preetha, P. "Studies On Epoxy Nanocomposites As Electrical Insulation For High Voltage Power Apparatus". Thesis, 2012. https://etd.iisc.ac.in/handle/2005/2543.
Pełny tekst źródłaPreetha, P. "Studies On Epoxy Nanocomposites As Electrical Insulation For High Voltage Power Apparatus". Thesis, 2012. http://etd.iisc.ernet.in/handle/2005/2543.
Pełny tekst źródłaTsai, Jen-Chen, i 蔡鎮丞. "Fault Diagnosis System Development for Rotating Electrical Machinery". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/00907609306541719105.
Pełny tekst źródła正修科技大學
電機工程研究所
99
The thesis proposes a artificail neural network(ANN) for rotor machinery fault diagosis system. The fault detection is important for the the electrical rotor machinery. The breakdown of the rotor electrical machinery, especially the important machines, will bring about interruption of production and reduce profits. If there is a predictive fault diagnosis system, the situation of the outage can be avoided. However, the components of the rotor machinery are more complex and more sophisticated recently. These causes resulting in the machine vibration problems become more various and complicated. The mechanical vibration signal is a major parameter for the predictive maintenance system. The subject draws much attention in the predictive detection research. However, the electrical signal is also an important response when the electrical rotor machinery is breakdown. The thesis propose a excellent fault detection method, which is not only vibration signal considered but also electrical signal. The ANN is used to forecast for the fault diagnosis system in the study. The operation situation of machine can be detected by the parameters of operational pressure, temperature, and vibration. The thesis, also proposes the input current of machinery for more precisely diagnosing the equipment operation situation. These parameters are used to set the training patterns for the ANN to develop the fault diagnosis systems. Keywords: rotor electrical machinery, fault diagnosis, artificial neural network
Hsieh, Chun-Nan, i 謝俊男. "Teaching Evaluation and Development of Teaching Aidsfor Rotating Electrical Machinery". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/98540020202718802276.
Pełny tekst źródła國立宜蘭大學
電機資訊學院碩士在職專班
102
This thesis is develops a set of innovative teaching aids for rotating electrical machinery. This device is based on an innovative concept that substitutes “Pulsed DC power supply” for the “AC source”. In manual operation mode, we break down the “continuous” rapid action of rotating electrical machinery into the “discrete” step-by-step manual operation mode. Through hands-on operations, students get to know the principles of motor actions step-by-step. We used permanent magnet as rotor and constructed stators with six coils. Three sets of coils must be mutually spaced at 120 degree intervals. Divided one AC sinusoidal period into 12 working sectors, so that each sector has 30 degree. Replaced the three-phase sine wave ac power with three-phase square wave ac power, making it easier to explain the model, given that the three-phase square wave power has three different output voltage levels. When the stator coil is connected to three phase pulsed DC power supply, it generates a magnetic field, causing the rotor to rotate. In actual operation, the motor simulation device could speed up to 2000 rpm. This project utilized two different colors of LED to represent the directions of magnetic lines of force and to indicate the magnetic field generated by the stator coil. Students can take advantage of the LED light changes to understand how the three-phase coil established a rotating magnetic field. The colorful blinking LED lights can effectively attract students' attention and significantly enhance their learning motivation and efficiency. This LED motor model could be used in vocational schools and universities and would be of great assistance in electric machinery courses and personnel training.
CHU, HUNG-SHIN, i 朱宏昕. "Modeling of Electric Energy Decoupling in Rotating Machine and the Controller Design". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/z48246.
Pełny tekst źródła國立虎尾科技大學
電機工程系碩士班
106
Nowadays, the power conversion system module is an indispensable important block for electric machinery vehicles. In the research, the different power converters have many similar active and passive components. With proper topology design and control laws, the size and cost of the whole system could be effectively reduced. This thesis based on the multi-voltage source voltage node switching analysis and switching unit matrix, systematically integrates different conversion architectures into a single system and uses motor inductance as a shared component in the power conversion system. In the electric energy conversion system, when the motor winding is used as a shared component, torque effects such as Electric Energy To Mechanical (ETM) and Electric Energy To Electricity (ETE) are generated. This thesis is mainly analysis and development of electric energy decoupling control method for ETM, combined with the electrical energy conversion mode of the composite electric energy system topology, can replace the mechanical jig hardware used to fix the motor rotor. Finally, the feasibility of this control method was verified by experiment.
Lin, Shang-Chih, i 林上智. "Study on Fuzzy Theory-Based Fault Diagnosis and Condition Monitoring Systems for Rotating Electrical Machine". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/839j53.
Pełny tekst źródła國立臺灣科技大學
電機工程系
104
Thanks to the rapid development of science and technology, artificial intelligence has been widely used in various industries, the fourth industrial revolution has quietly come, the rotating electrical machine is the mother of industry, plays a pivotal role in the power grid and plants, and predict maintenance strategy is now of concern important operation and maintenance issues, therefore, put forward a fuzzy theory-based fault diagnosis and condition monitoring systems for rotating electrical machine, which will help to enhance the reliability of the unit stable operation. In this study, a total of ten rotating electrical machine for an experimental model to make electrical, vibration and partial discharge signal analysis, and the use of data mining technology in the mining potential of the signal fault symptoms, according to different considerations of cost and safety factors are proposed five kinds of fault diagnosis and three states monitoring system solutions. The experimental model test results, 52 % of the electrical method with the highest probability of accurately infer broken rotor bar fault, vibration method to 100 % of the highest probability of accurately infer the bearing outer ring damage and eccentric failure, partial discharge method with the highest probability of 100 % accurately infer the stator insulation failure. However, hybrid electric and vibration method can effectively improve the broken rotor bars inference probability to 83 %, and then integrate the partial discharge method, can be more accurately identification of stator insulation type of exception, and effectively avoid the possibility of misjudged, electrical, vibration and partial discharge of condition monitoring systems, taking into account relevant monitoring programs, such as the gap spacing and failure factors, and strengthening existing international standards-based condition monitoring guidelines, but in the future remains to be done to monitor the long-term operation of the rotating electrical machine, according to data analysis adjustment inference rule and the weight values to expect substantive enhance monitoring performance and operation reliability. Concluding our proposed rotating electrical machine operation and maintenance strategy confirmed by experiments with the feasibility and effectiveness. We look forward to a positive helpful in the development process of the domestic industry, and further to avoid rotating motor abnormalities lead to serious negative impact on casualties and economic losses.
Wang, KeSheng. "Vibration monitoring on electrical machine using Vold-Kalman filter order tracking". Diss., 2008. http://hdl.handle.net/2263/27613.
Pełny tekst źródłaDissertation (MSc)--University of Pretoria, 2008.
Mechanical and Aeronautical Engineering
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