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Dissertations / Theses on the topic 'Three phase machine'
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1
Gao, Liliang. "Control of three-level 5-phase induction machine drive system." Thesis, University of Strathclyde, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.510860.
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Chambega, D. J. "Analysis and control of a three phase power permanent magnet machine." Thesis, University of Strathclyde, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382343.
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Almarhoon, Ali. "Sensorless control of dual three-phase permanent magnet synchronous machine drives." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/15888/.
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Ren, Yuan. "Direct torque control of dual three-phase permanent magnet synchronous machine drives." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/12190/.
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Andrews, Darin M. "Direct torque control of a three-phase voltage source inverter-fed induction machine." Thesis, Monterey, California: Naval Postgraduate School, 2013. http://hdl.handle.net/10945/38872.
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Approved for public release; distribution is unlimited.The scope of this thesis involves various techniques to control the torque of a voltage source inverter-fed induction motor. The three methods investigated here are voltage by frequency, known as scalar control, field-oriented control with and without space vector modulation, and direct torque control. Although all three techniques have been proven effective, each technique possesses its own advantages and disadvantages. In todays engineering world, time and money are saved by utilizing software developed to accurately model a physical system and to compare with hardware previously implemented in a lab. Comparisons can be made to determine how each of these torque control methods perform under static and dynamic modes of operation. The United States military can benefit from this study by modifying or adding onto the software models developed here with little cost and use these models to do trade studies without the cost of lab demonstrations.
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Vichis-Rodriguez, Damian Sergio. "Modelling of three phase AC machines suitable for internal fault simulation, detection and analysis in multi-machine power systems." Thesis, University of Glasgow, 2010. http://theses.gla.ac.uk/1782/.
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The ever increasing demand for electrical energy has meant that electrical power systems have evolved to be the highly complex networks that are in existence today, where the transient interactions that take place between large synchronous generators have been the focus of advanced research for many decades. More recently, the proliferation of synchronous and asynchronous generators of comparatively small rating, which are not centrally planned, has added new impetus to this area of research. At a time when not only technical but also economic and environmental concerns must be carefully assessed, more realistic models of the individual power plant transient response and its interaction with the rest of the network become mandatory to achieve more accurate analysis of the network operation and prevent wastage of technical and economical resources. The main thrust of this research project is to develop comprehensive models of rotating machinery with which to assess the transient response of electrical power networks that undergo severe unbalanced operation due to faulty conditions developing anywhere in the power network, including the rotating machinery’s windings. To achieve an unrivalled speed of response, a nodal-based model of the electrical power network has been developed, enabling the study of power networks of any size and topological formation with the utmost flexibility and efficiency. The rotating machinery addressed in this research work is the three-phase synchronous generator and the three-phase asynchronous (induction) machine. In multi-machine power systems transient studies, it is common to look at all the rotating machinery in the network as being healthy units having an idealized sinusoidally distributed stator winding – the possibility of a severe unbalanced condition internal to the machine due to internal fault or the effect of space harmonics, has, so far, not been addressed in a multi-machine environment. In this research work, new EMTP type models, with enhanced numerical properties, are constructed for the simulation of internal and external machine fault phenomena with different levels of details including the effects of saturation and space harmonics. Advanced numerical methods are employed to improve on the numerical stability of the network model allowing the use of larger time steps than what otherwise is possible with traditional numerical methods, enabling the new model to execute faster than existing models and yet to exhibit the same degree of numerical accuracy with an unrivalled degree of modelling flexibility. A case in point is an application made to model the transient response of a Variable Frequency Transformer (VFT) undergoing internal faults on its stator side. The rotating machinery models with internal fault representation developed in this research lend themselves to an application in the area of condition monitoring, where a new method is developed to detect internal faults in the stator side of three phase rotating machinery. The method is shown to be highly effective when applied to machines operating in an isolated environment as well as in a multi-machine power system, performing very well when applied to different types of equipment and various kinds of internal faults.
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Nguyen, Ngoc Linh. "Predictive control of two synchronous machines in parallel supplied by a standard three phase static converter." Phd thesis, Toulouse, INPT, 2013. http://oatao.univ-toulouse.fr/9906/1/nguyen.pdf.
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Nowadays, embedded systems are more and more numerous that impacted strongly energy conversion systems. Associated constraints translates into a reduction of the masses and the losses to improve energy efficiency in the conversion chain. This is the case in the field of aeronautics or the concept of ″More Electric Aircraft″ now becomes a reality. Therefore, the permanent magnet synchronous machine becomes an actuator of excellence because of its important mass power, its low maintenance cost and its dynamic qualities. When these machines are associated to carry out cooperative functions (for example flight surfaces) can still reduce the mass embedded in pooling power electronics. It is precisely in this context that localizes our work by offering structures power electronics-based, reduced to power for two or more electric machines in parallel and providing control laws aimed at improving energy efficiency. We we are interested specifically in the Predictive Control of two Synchronous Machines connected in parallel with a 3-Phase Converter. These machines have identical characteristics and must follow a same velocity profile with a torque of different load and in any case independent. The predictive control approach leads us to consider the voltage inverter as a device having a finite number of input states and we need to select every moment the best control solution to minimize a cost function. This cost function on one or two machines, is composed of a portion which represents the quality of the produced torque (Iq current) and another party representative quality of the conversion via produced losses (Id current). This approach works naturally for variable switching frequency. Thus the document state of different solutions studied showing the limits of such an approach both dynamic in terms of losses. To improve this basic solution we develop an approach based on the use of virtual vector which increase the possibilities of control and led to operation at constant frequency through a SVM solution. The search for an optimum virtual vector is proposed and applied to a device consisting of two low-power machines. The various proposals are validated through numerical simulation and consolidated by experimental results.
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McKinnon, 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.
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This thesis describes new methods of evaluating the efficiency of three-phase induction machines using synthetic loading. Synthetic loading causes the induction machine to draw full-load current without the need to connect a mechanical load to the machine's drive shaft. The synthetic loading methods cause the machine to periodically accelerate and decelerate, producing an alternating motor-generator action. This action causes the machine, on average over each synthetic loading cycle, to operate at rated rms current, rated rms voltage and full-load speed, thereby producing rated copper losses, iron loss and friction and windage loss. The excitation voltages are supplied from a PWM inverter with a large capacity DC bus capable of supplying rated rms voltage. The synthetic loading methods of efficiency evaluation are verified in terms of the individual losses in the machine by using a new dynamic model that accounts for iron loss and all parameter variations. The losses are compared with the steady-state loss distribution determined using very accurate induction machine parameters. The parameters were identified using a run-up-to-speed test at rated voltage and the locked rotor and synchronous speed tests conducted with a variable voltage supply. The latter tests were used to synthesise the variations in stator leakage reactance, magnetising reactance and the equivalent iron loss resistance over the induction machine's speed range. The run-up-to-speed test was used to determine the rotor resistance and leakage reactance variations over the same speed range. The test method results showed for the first time that the rotor leakage reactance varied in the same manner as the stator leakage and magnetising reactances with respect to current. When all parameter variations are taken into account there is good agreement between theoretical and measured results for the synthetic loading methods. The synthetic loading methods are applied to three-phase induction machines with both single- and double-cage rotors to assess the effect of rotor parameter variations in the method. Various excitation waveforms for each method were used and the measured and modelled efficiencies compared to conventional efficiency test results. The results verify that it is possible to accurately evaluate the efficiency of three-phase induction machines using synthetic loading.
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Elwakil, Ehab. "A new converter topology for high-speed high-starting-torque three-phase switched reluctance motor drive system." Thesis, Brunel University, 2009. http://bura.brunel.ac.uk/handle/2438/3009.
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Switched reluctance motor (SRM) has become a competitive selection for many applications of electric machine drive systems recently due to its relative simple construction and its robustness. The advantages of those motors are high reliability, easy maintenance and good performance. The absence of permanent magnets and windings in rotor gives possibility to achieve very high speeds (over 10000 rpm) and turned SRM into perfect solution for operation in hard conditions like presence of vibrations or impacts. Such simple mechanical structure greatly reduces its price. Due to these features, SRM drives are used more and more into aerospace, automotive and home applications. The major drawbacks of the SRM are the complicated algorithm to control it due to the high degree of nonlinearity, also the SRM has always to be electronically commutated and the need of a shaft position sensor to detect the shaft position, the other limitations are strong torque ripple and acoustic noise effects.
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Hord, Kyle A. "MODELING AND VALIDATION OF A SYNCHRONOUS-MACHINE/CONTROLLED-RECTIFIER SYSTEM." UKnowledge, 2014. http://uknowledge.uky.edu/ece_etds/42.
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The hardware validation of a novel average-value model (AVM) for the simulation of a synchronous-generator/controlled rectifier system is presented herein. The generator is characterized using genetic algorithm techniques to fit standstill frequency response (SSFR) measurements to q and d-axis equivalent circuits representing the generator in the rotor reference frame. The generator parameters form the basis of a detailed model of the system, from which algebraic functions defining the parametric AVM are derived. The average-value model is compared to the physical system for a variety of loading and operating conditions including step load change, change in delay angle, and external closed-loop control, validating the model accuracy for steady-state and transient operation.
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Izguden, Mustafa. "Design Software Development For Induction Motors." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613229/index.pdf.
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The purpose of this thesis has been to convert two softwares called TPCAD (Three Phase Induction Machine Computer Aided Desing) and SPCAD (Single Phase Induction Machine Computer Aided Design) developed earlier for the design and analysis of three and single phase induction machines to meet the needs of motor manufacturing industry so that they can be run in windows environment. Furthermore, it was aimed to include features such as double cage motor analysis and design, to provide a facility designed motor lamination can be drawn for the user to see and facilitate sharing the designed lamination with other professional programs such as finite element analysis or thermal analysis etc.
As a result of this study, a user friendly design tool facilitating the design process of induction motors has been upgraded by using C++ Microsoft Visual Studio .Net programming language. TPCAD and SPCAD are tested with different commercial motors. The results show that the full load performance calculations are within the range of 5% error for both programs. However, starting performance calculation errors are within 10% for TPCAD, and 8% for SPCAD.
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Singh, Bhanu Pratap. "Real-time detection of stator resistance unbalances in three phase drives." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-286813.
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An estimated 30% of the faults in Induction Machine (IM) are related to its stator. These faults are mostly in the form of an Inter-Turn Short Circuit (ITSC) fault i.e., when two winding inside the stator of IM are shorted due to insulation failure. However, ITSC fault can be avoided by detecting them in advance and then scheduling the maintenance of the IM. This thesis studies two methods for detecting this incipient ITSC fault in a three-phase IM and then estimating the stator resistance unbalance due to the ITSC fault. The first method is based on the asymmetry caused in the IM by the ITSC fault. As a result of this asymmetry, the negative sequence components of the stator voltages and the stator currents are generated inside the IM. A healthy IM also have these negative sequence components due to the manufacturing process and the supply voltage unbalances. The characteristics and the compensation methods of these negative sequence components in a healthy IM are discussed. The results show that after compensating the negative sequence components in a healthy machine, they can be used for detecting an ITSC fault and then to calculate the fault quantities as well as the stator resistance unbalances. The second method for detecting an ITSC fault is based on analysing the stator resistance unbalances. A three-phase drive is used to inject DC voltage in the stationary reference frame. The DC current generated by this DC voltage is measured and then by applying Ohm’s law stator phase resistances are calculated. In a healthy IM, the phase resistances are balanced. However, in case of ITSC fault in any of the phases, the phase resistance of that phase deviates from those of the other two phases which can be utilized for detecting ITSC fault.Uppskattningsvis 30% av alla fel i induktionsmaskiner (IM) är kopplad till dess stator. Dessa fel är i huvudsak Inter-Turn Short Circuit (ITSC)-fel, dvs. två lindningar inom IM:ens stator blir kortsluta pga. ett isoleringsfel. Emellertid kan man undvika ITSC-fel genom att detektera dem i förhand och planera underhåll. Det här examensarbetet undersöker två metoder för att detektera ett förestående ITSC-fel i en tre-fas IM. Den första metoden är baserad på asymmetrin i IM:er pga. ITSC-felet. Resultatet av den här asymmetrin är att en negativ sekvens genereras i IM:ens statorspänning och statorström. En oskadad IM kan också visa dessa negativa sekvenser pga. tillverksprocessen och statorspänningsobalanser. Egenskaperna och kompensationsmetoderna för dessa negativa sekvenser i en oskadad IM kommer att diskuteras. Resultaten visar att efter kompenseringen av de negativa sekvenserna i en oskadad IM, kan de användas för att detektera ITSC-fel och efteråt för att beräkna felstorheter och även statormotståndobalanser. Den andra metoden för att detektera ITSC-fel är baserad på en undersökning av statormotståndobalanser. Ett tre-fas-drivsystem används för att injektera likspänning i den stationära referensramen. Likströmmen som följer av denna likspänning mäts och statorfasmotstånden beräkna efteråt med Ohms lag. I en oskadad IM är fasmotstånden balanserade. Däremot, när ett ITSC-fel uppstår i en fas, avviker fasmotståndet i den felaktiga fasen från de andra två fasernas, vilket kan användas för att detektera ITSC-fel.
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Teixeira, Gerson Paz. "Desenvolvimento de uma máquina síncrona trifásica com ímãs de Nd-Fe-B e núcleo do rotor a partir de ferro sinterizado para aplicação em aerogeradores de 7,5 kW." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/172055.
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Desenvolvimento de uma máquina síncrona trifásica com ímãs de Nd-Fe-B e núcleo do rotor a partir de ferro sinterizado para aplicação em aerogeradores de 7,5 kW, verificando a viabilidade do protótipo. Partindo de um projeto anteriormente desenvolvido, foi realizada alteração no ângulo das chapas do estator em 10º, com o intuito de minimizar o efeito de correntes parasitas, sendo esse um dos fatores que influenciam os resultados. Para avaliação de desempenho, foi utilizada uma bancada de testes composta de analisador de energia, sensor de torque e instrumentos de medição, sendo o acionamento do protótipo realizado através de um motor de indução controlado por um inversor de frequência. Entre os resultados encontrados, foi constatada a presença de harmônicas que impactam sobre os valores obtidos do protótipo. Os testes realizados, de simulação e parâmetros elétricos, indicaram resultados apropriados ao desempenho de uma máquina elétrica trifásica, porém mostram-se necessárias alterações para um melhor desempenho do protótipo.Development of a three-phase synchronous machine with Nd-Fe-B magnets and rotor core from sintered iron for application in 7.5 kW wind turbines, verifying the feasibility of the prototype. Starting from a previously developed design, a change in the angle of the stator plates was made in 10º, in order to minimize the effect of the parasite currents, being one of the factors that influence the results. For performance evaluation, a test bench composed of energy analyzer, torque sensor and measuring instruments was used, and the drive of the prototype was carried out through an induction motor controlled by a frequency inverter. Among the results found, it was verified the presence of harmonics that impact on the values obtained from the prototype. The tests performed, simulation and electrical parameters, indicated results appropriate to the performance of a three-phase electric machine, however changes are needed for a better performance of the prototype.
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Bock, Jean-Pierre. "Modélisation et calcul couplé des champs électromagnétiques dans les machines asynchrones en régime transitoire." Vandoeuvre-les-Nancy, INPL, 1996. http://www.theses.fr/1996INPL094N.
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Ce travail apporte une contribution au calcul des machines électriques asynchrones, dans le cas ou une modélisation de type circuits couplés est impossible (rotors massifs ou à cage profonde). La première partie expose les différentes façons de prendre en compte le mouvement. La deuxième partie expose une nouvelle méthode, double entrefer et approximation du premier harmonique d'espace, qui est ensuite développée dans le cas des régimes transitoires, à courants imposés puis à tensions imposées. On montre aussi que la méthode se prête à un couplage avec des circuits électriques extérieurs. Dans la troisième partie, on procède à une validation de la méthode pour deux machines à induction pour lesquelles nous disposions de données expérimentales: une machine triphasée de 950 kW et une machine diphasée de 300 W avec condensateur. Dans la quatrième partie, on prévoit les caractéristiques d'un prototype de machine rapide (100 kW, 30 000 tr/mn) alimenté de différentes manières par deux sortes d'onduleurs. À l'approximation du premier harmonique d'espace, la méthode développée autorise des rotations élémentaires importantes, ce qui correspond à un gain de temps appréciable par rapport au suivi des grandeurs elles mêmes. La méthode peut être affinée par la prise en compte d'harmoniques supérieurs, et elle est généralisable aux cas des machines saturées
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Juchelka, Roman. "Návrh asynchronního motoru pro kaskádní systém čerpání kapalin." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-241987.
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This thesis deals with the design of electrical machine for direct drive of cascade liquid pumping system. At the beginning a suitable type of electrical machine and some of its basic parameters are selected. Finally, the 4 pole three phase induction machine powered by alternating voltage 3x400 V was chosen. After that complete design is made with respect to all specified requirements. The designed machine is analyzed with the use of ANSYS Maxwell and RMxprt software. The main outcome of the thesis are dimensional sketches of the engine that will be used as the basis for the production of the prototype.
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Rye, Rebecca Pilar. "Design and Evaluation of a Photovoltaic Inverter with Grid-Tracking and Grid-Forming Controls." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/97398.
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This thesis applies the concept of a virtual-synchronous-machine- (VSM-) based control to a conventional 250-kW utility-scale photovoltaic (PV) inverter. VSM is a recently-developed control scheme which offers an alternative grid-synchronization method to the conventional grid-tracking control scheme, which is based on the dq phase-locked-loop- (PLL-) oriented vector control. Synchronous machines inherently synchronize to the grid and largely partake in the stabilization of the grid frequency during power system dynamics. The purpose of this thesis is primarily to present the design of a grid-forming control scheme based on the VSM and the derivation of the terminal dq-frame ac impedance of the small-signal model of the inverter and control scheme. This design is also compared to the design of the conventional grid-tracking control structure, both from a loop design and terminal dq-frame ac impedance standpoint. Due to the inherent lax power-balance synchronization, the grid-forming control scheme results in 1 to 2 decades' lower frequency range of negative incremental input impedance in the diagonal elements, which is a favorable condition for stability. Additionally, the stability of the grid-forming control scheme is compared to the conventional grid-tracking control using the generalized Nyquist criterion (GNC) for stability under three modes of operation of active and reactive power injection. It is found that the connection is stable for both control schemes under unity power factor and fixed reactive power modes; however, the grid-forming control is able to inject twice the amount of active power under the voltage regulation mode when compared to the grid-tracking control.Master of Science
Concerns about the current and future state of the environment has prompted government and non-profit agencies to enact regulatory legislation on fossil fuel emissions. In 2017, electricity generation comprised 28% of total U.S. greenhouse gas emissions with 68% of this generation being due to coal combustion sources. As a result, utilities have retired a number of coal power plants and have employed alternative means of power generation, specifically renewable energy sources (RES). Most RES operate as variable-frequency ac sources (wind) or dc sources (solar) and are interfaced with the power grid through ac-dc-ac or dc-ac converters, respectively, which are power-electronic devices used to control the injection of power to the grid. Conventional converters synchronize with the grid by tracking the phase of the voltage at the point of common coupling (PCC) through a phase-locked loop (PLL). While power system dynamics significantly affect the performance of a PLL, and, subsequently, inverters' operation, the initial frequency regulation during grid events is attributed to the system's inherent inertia due to the multitude of synchronous machines (SM). However, with the steady increase of RES penetration, even while retaining the number of SM units, the net inertia in the system will decrease, thus resulting in prolonged responses in frequency regulation to the aforementioned dynamics. This thesis investigates the control of variable-frequency sources as conventional synchronous machines and provides a detailed design procedure of this control structure for photovoltaic (PV) inverter applications. Additionally, the stability of the connection of the inverter to the grid is analyzed using innovative stability analysis techniques which treat the inverter and control as a black box. In this manner, the inner-workings of the inverter need not be known, especially since it is proprietary information of the manufacturer, and the operator can measure the output response of the device to some input signal. In this work, it is found that the connection between the inverter and grid is stable with this new control scheme and comparable to conventional control structures. Additionally, the control based on synchronous machine characteristics shows improved stability for voltage and frequency regulation, which is key to maintaining a stable grid.
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Dragan, Milićević. "Razvoj naprednog upravljanja pogonom sa šestofaznim asimetričnim asinhronim motorom." Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2014. http://dx.doi.org/10.2298/NS20140117MILICEVIC.
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U tezi je prikazana analiza pogona sa šestofaznom asimetričnomasinhronom mašinom koja se napaja iz šestofaznog invertora.Predložen je novi način upravljanja šestofaznim invertorom kojimsu rešeni nedostaci do sada predloženih tehnika upravljanja a kojise pre svega ispoljavaju kroz dva aspekta: nekontrolisano generisanjedodatnih gubitaka i teška implementacija u komercijalno dostupnedigitalne kontrolere. Rezultati svih teorijskih analiza i navoda sudokazani računarskim simulacijama i eksperimentalnim putem.Eksperimentalna verifikacija je ostvarena korištenjemlaboratorijskog prototipa koji se temelji na dSPACE kontrolnomsistemu.Doctoral thesis shows the analysis of the dual three-phase induction machinedrive. A novel way of driving of the six-phase inverter is proposed. Aproposed method solves disadvantages of currently proposed drivingtechniques which are manifested in two aspects: the uncontrolled generationof additional losses and difficult implementation in commercially availabledigital controllers. The results of theoretical analysis and the statements areproven by computer simulation and experimentally. Experimental verificationis achieved using a laboratory prototype that is based on dSPACE controlsystem.
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Cheang, Tak Son. "Inter-turn faults of three-phase induction machines." Thesis, University of Macau, 1997. http://umaclib3.umac.mo/record=b1445597.
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Mustafa, Mohammed Obaid. "Faults detection and diagnosis for three phase induction machines." Licentiate thesis, Luleå tekniska universitet, Signaler och system, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26592.
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Three phase induction motors have been intensively utilized in industrial applications, mainly due to their efficiency and reliability. These motors have good properties such as: increased stability and robustness, durability, large power to weight ratio, low production costs and controllability easiness. The most common faults that could happen in the rotor and the stator are: a) short circuit in stator winding, b) broken rotor bars, c) bearing failures, and d) dynamic or static air gap irregularities. These types of faults, are necessary to be identified and categorized, as soon as possible as they can end up in serious damages if not detected in due time.The aim of this licentiate thesis is to present a model based fault detection and diagnosis schemes for three phase induction motors relying on the Set Membership Identification (SMI) approach. In the proposed scheme proper uncertainty bounds and boundary violation rules have been established for detecting and categorizing the fault occurrences. The novel presented diagnostic and fault detection methods are able to detect and classify two types of induction motor faults: a) broken rotor bars, and b) short circuit in stator winding. As it will be analytically presented in the thesis, during the initialization of the algorithm, the parameters of the healthy induction motor are being identified by the utilization of the Recursive Least Squares, extended by the Set Membership concepts, where corresponding uncertainty bounds are also being recursively being calculated based on the assumed noise levels. In the sequel the proposed bound violation conditions for the fault detection and fault diagnosis are being online evaluated, on the converged identified motor parameters, within a sliding time window.The simulation results have been presented motor performance in healthy and faulty cases such as stator currents, rotor currents, torque, and angular speed of the motor. The efficiency of the proposed scheme has been extended evaluated with simulation studies for the cases of: a) one broken bar fault, b) 2\% short circuit fault, c) multiple number of broken bars.Godkänd; 2012; 20121104 (mohoba); LICENTIATSEMINARIUM Ämne: Reglerteknik/Automatic Control Examinator: Professor Thomas Gustafsson, Institutionen för system- och rymdteknik, Luleå tekniska universitet Diskutant: Post-Dr. Researcher George Georgoulas, Dept. of Informatics and Communications Technology, TEI of Epirus, Greece Tid: Tisdag den 4 december 2012 kl 10.15 Plats: A109, Luleå tekniska universitet
Feldetektering i elektriska maskiner
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Schoen, Randy R. "On-line current-based condition monitoring of three-phase induction machines." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/12952.
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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.
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The work is focusing on dynamic effects of short-circuit currents, more precisely dynamic effects of short-circuit currents on switchgear cabinet (terminal box). The work was designated to a concrete construction type of two switchgear cabinets located on rotating machines via company Siemens Electric Machines Drásov s.r.o.. The switchgear cabinets are designed for non-explosive environment where the air is used as an insulating medium. The task was to determine how the device will behave during the three-phase short-circuit and three-phase short-circuit with earth/ground connection. The following programs were used for the calculations and simulations: Ansoft Maxwell 16.0, Ansoft Maxwell 2015 and ANSYS Workbench 16.0. By using these programs the effects of forces which acts on current paths in cabinet caused by the passage of short-circuit current were simulated, statically and also dynamically. Further the effects of pressure acting on cabinet frame during the arc short-circuit have been statically and dynamically simulated. All the results are summarized in the conclusion. Conclusion also contains the final evaluation of the functionality of both switchgear cabinets.
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Svoreň, Jan. "Návrh vysokootáčkového asynchronního motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219753.
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This work deal with troubleshooting of problem parts of high-speed induction machines. Introduction is about conception of induction machines with reference to construction specialities due to high rpm and because machines are fed by inverter. Next part is focused to design problems. A classical induction machine was measured to determination change of various losses in classic and high-speed induction machines. The computation of laboratory sample high-speed motor was specified for calculation of effective resistance and leakage reactance of solid-steel rotor with copper layer. The results of numerical calculation were validated by using finite elements method and machine design was adjusted for improving operation characteristic.
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Paterson, Neil. "The analysis and detection of faults in three phase induction machines using finite element techniques." Thesis, Robert Gordon University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244269.
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Goynuk, Yilmaz. "Development Of An Electrical Machines Analysis And Optimum Design Software Package." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609788/index.pdf.
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In this study, three different programs are developed for the analysis of the
three-phase induction motor, single-phase capacitor type induction motor
and switched reluctance motor. The programs are developed by using Pascal
and C++ programming languages. In the performance calculations of motors,
analytical methods are used and these methods are tested for accuracy.
These programs have also capabilities to design an optimum motor, which
meets a set of performance, material and manufacturing constraints while
minimizing the weight or any other defined objective function.
In addition, in this study, an optimization tool is used to obtain an appropriate
optimization method for the design of different types of motors.
The software is tested over different commercial motors. The results illustrates
that the performance calculations and optimization approach of the
programs lead to good results.
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Aboelhassan, Mustafa Osman Elrayah. "Robustní řízení synchronního stroje s permanentními magnety a spínaným tokem." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-233605.
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Je jasné, že nejúspěšnější konstrukce zahrnuje postup vícefázového řízení, ve kterém každá fáze může být považována za samostatný modul. Provoz kterékoliv z jednotek musí mít minimální vliv na ostatní, a to tak, že v případě selhání jedné jednotky ostatní mohou být v provozu neovlivněny. Modulární řešení vyžaduje minimální elektrické, magnetické a tepelné ovlivnění mezi fázemi řízení (měniče). Synchronní stroje s pulzním tokem a permanentními magnety se jeví jako atraktivní typ stroje, jejíž přednostmi jsou vysoký kroutící moment, jednoduchá a robustní konstrukce rotoru a skutečnost, že permanentní magnety i cívky jsou umístěny společně na statoru. FS-PMSM jsou poměrně nové typy střídavého stroje stator-permanentní magnet, které představují významné přednosti na rozdíl od konvenčních rotorů - velký kroutící moment, vysoký točivý moment, v podstatě sinusové zpětné EMF křivky, zároveň kompaktní a robustní konstrukce díky umístění magnetů a vinutí kotvy na statoru. Srovnání výsledků mezi FS-PMSM a klasickými motory na povrchu upevněnými PM (SPM) se stejnými parametry ukazuje, že FS-PMSM vykazuje větší vzduchové mezery hustoty toku, vyšší točivý moment na ztráty v mědi, ale také vyšší pulzaci díky reluktančnímu momentu. Pro stroje buzené permanentními magnety se jedná o tradiční rozpor mezi požadavkem na vysoký kroutící moment pod základní rychlostí (oblast konstantního momentu) a provozem nad základní rychlostí (oblast konstantního výkonu), zejména pro aplikace v hybridních vozidlech. Je předložena nová topologie synchronního stroje s permanentními magnety a spínaným tokem odolného proti poruchám, která je schopná provozu během vinutí naprázdno a zkratovaného vinutí i poruchách měniče. Schéma je založeno na dvojitě vinutém motoru napájeném ze dvou oddělených vektorově řízených napěťových zdrojů. Vinutí jsou uspořádána takovým způsobem, aby tvořila dvě nezávislé a oddělené sady. Simulace a experimentální výzkum zpřesní výkon během obou scénářů jak za normálního provozu, tak za poruch včetně zkratových závad a ukáží robustnost pohonu za těchto podmínek. Tato práce byla publikována v deseti konferenčních příspěvcích, dvou časopisech a knižní kapitole, kde byly představeny jak topologie pohonu a aplikovaná řídící schémata, tak analýzy jeho schopnosti odolávat poruchám.
26
Un, Emre. "Common Mode Voltage And Current Reduction In Voltage Source Inverter Driven Three Phase Ac Motors." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609062/index.pdf.
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In this thesis various reduced common mode voltage (RCMV) pulse width modulation (PWM) techniques and active/passive common mode voltage (CMV) reduction methods for voltage source inverter driven three-phase AC motors are theoretically and practically investigated. A novel RCMV-PWM method, the near state PWM (NSPWM) method is proposed for operation at high modulation index. At low modulation index, a modified version of an existing RCMV-PWM method, AZSPWM1, termed as MAZSPWM, is proposed to mitigate the voltage reflection problem of the method. An optimum modulation algorithm combining NSPWM and MAZSPWM with seamless transition is proposed. The proposed RCMV-PWM methods significantly reduce CMV but they suppress common mode current (CMC) partially. Utilization of a common mode inductor together with RCMV-PWM methods is effective in suppressing the CMC. In the study, in addition to the CMV characteristics, various practical performance characteristics such as voltage linearity, inverter output current ripple, inverter DC-link current ripple, and output line-to-line voltage pulse pattern are also analyzed. The study involves analysis, computer simulations, and detailed laboratory experiments.
27
Wai, Lo-kau. "Microprocessor-based field-oriented control of a synchronous motor drive using a three-phase solid-state sinusoidal current source /." Hong Kong : University of Hong Kong, 1988. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12434425.
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韋盧溝 and Lo-kau Wai. "Microprocessor-based field-oriented control of a synchronous motor drive using a three-phase solid-state sinusoidal current source." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1988. http://hub.hku.hk/bib/B31208940.
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Cheang, Tak Son. "Math-model based machinery and AI-based diagnostic technologies for detecting and locating the inner-faults of three-phase squirrel-cage induction motors." Thesis, University of Macau, 2010. http://umaclib3.umac.mo/record=b2148534.
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Mouzinho, Lucilene Ferreira. "REDES NEURAIS ARTIFICIAIS PARA ESTIMAÇÃO DE VELOCIDADE EM MÁQUINAS DE INDUÇÃO." Universidade Federal do Maranhão, 2003. http://tedebc.ufma.br:8080/jspui/handle/tede/322.
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Previous issue date: 2003-03-12This work presents an artificial neural network model to estimate or indirectly measure the speed of three-phase induction machines for control purpose. A comparative analysis of the neural estimator is performed with the following types of speed estimators: rotor flux, electromotive force and model reference adaptive. The algorithms of the estimators are assembled and connected to the dq0 model of the induction machine. Computational simulation results, obtained from machine-estimators model, are used to carry out a comparative analysis of the speed estimators performance. This work also presents a survey on neural network applications in induction machines, covering the following issues: control, failure, supervision, diagnosis, identification and estimation.
Nesta dissertação apresenta-se um modelo de uma rede neural artificial para estimar ou medir indiretamente a velocidade em máquinas de indução trifásicas para fins de controle. Realiza-se uma análise comparativa do estimador neural com os seguintes tipos de estimadores de velocidade fundamentados: fluxo do rotor, força eletromotriz e modelo adaptativo de referência. Os algoritmos dos estimadores são construídos e acoplados ao modelo dq0 da máquina de indução. A partir de resultados de simulações computacionais, obtidos dos modelos máquina-estimadores, realiza-se a análise de desempenho dos estimadores que tem como objetivo verificar quais dos estimadores atingiu em menor tempo uma velocidade de referência. Este trabalho também apresenta um estudo sobre a aplicação de redes neurais em máquinas de indução, abordando os seguintes tópicos: controle, falhas, supervisão, diagnóstico, identificação e estimação.
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Dejan, Jerkan. "Динамички модел трофазне кавезне асинхроне машине заснован на методи коначних елемената." Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2016. http://www.cris.uns.ac.rs/record.jsf?recordId=101821&source=NDLTD&language=en.
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Тема докторске дисертације је развој и верификација новог динамичкогмодела трофазне кавезне асинхроне машине, који је заснован наметоди коначних елемената. Применом линеарних магнетостатичкихсимулација и time-harmonic нелинеарних симулација се реконструишуиндуктивности динамичког модела машине заснованог на вишеструкоспрегнутим електричним колима. Модел се затим користи уистраживању феномена везаних за појаву жљебних хармоника,сатурацијом индукованих хармоника, као и у развоју нове методедетекције сломљних шипки у роторском кавезу.Tema doktorske disertacije je razvoj i verifikacija novog dinamičkogmodela trofazne kavezne asinhrone mašine, koji je zasnovan nametodi konačnih elemenata. Primenom linearnih magnetostatičkihsimulacija i time-harmonic nelinearnih simulacija se rekonstruišuinduktivnosti dinamičkog modela mašine zasnovanog na višestrukospregnutim električnim kolima. Model se zatim koristi uistraživanju fenomena vezanih za pojavu žljebnih harmonika,saturacijom indukovanih harmonika, kao i u razvoju nove metodedetekcije slomljnih šipki u rotorskom kavezu.
Topic of this thesis is development and verification of the novel dynamicalmodel of the three phase squirrel-cage induction machine, which is based onthe finite elements method. Linear magnetostatic simulations and nonlineartime-harmonic simulations are used for calculation of the inductances of thedynamic model of the machine based on the moultiple coupled circuitapproach. Model is then used for investigation of the rotor slot harmonics,saturation induced harmonics and in the development of the novel methodfor broken rotor bars detection.
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Quan, Nguyen Hong, and Nguyen Hong Quan. "Design and Sensorless Control of Three-Phase Wound-Field Flux-Switching Machine." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/xpfw6x.
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博士國立臺北科技大學
電機工程系
107
The research presents a machine design and sensorless control algorithms development for three-phase outer-rotor wound-field flux-switching machines (WFFSM) having field and armature windings on the stator. The outer-rotor configuration is an appropriate candidate for the in-wheel traction applications. On the other hand, the field windings replacing permanent magnets (PM) provide a potential for lower cost applications and the investigation of control algorithms. The operational principle and electro-magnetic design of a three-phase, 12 slot-7 pole (12S-7P) WF-FSM with outer-rotor configuration were studied first. This topology was selected because it produced higher torque and fewer back-electromotive force voltage harmonics than the other topologies. The machine was designed on the basis of the physical dimension limitations for in-wheel traction in a lightweight electric scooter. Because this machine exhibits shaft radial magnetic force caused by the odd rotor poles, a novel dual-structure motor is proposed to reduce this force. The finite element analysis (FEA) calculation results demonstrated that the shaft radial force can be reduced to nearly zero with this design, whereas the generated torque was reduced only by 3%. The effectiveness of the design was also verified through the experiments that compared theii vibrations of the original and the dual-structure motors. The vibration of the dualstructure motor was substantially lower than that of the original motor. The mathematical model for WF-FSM was derived based on the model of permanent magnet synchronous machine (PMSM) with the inclusion of the field component. A 3x3 matrix model has been expressed with both coupling of q-d axes and d axis-field. An approximated high frequency model was also derived for the development of sensorless control. Two sensorless control schemes for WF-FSM are developed in this thesis, the high frequency (HF) voltage injection based and the backEMF based controls. The square-wave HF voltage injection based algorithm has several variations since there are two windings in the machine. Both the analytical and experimental results reveal that the scheme with d-axis voltage injection and q-axis inducing current process is generally similar to that used for PMSMs. Polarity identification is required to prevent phase errors in the estimated position. The schemes with separate windings for voltage injection and current processing demonstrate superior performance compared with the scheme without, and both schemes do not require polarity identification. Moreover, voltage injection at the field winding has an additional advantage for high-speed operations. The second sensorless control scheme developed in this thesis is based on the extended back-EMF. Because of the field excitation, the position estimated from the extended back-EMF has an offset-angle which is related to the field current. The influence of the offset-angle is negligible when the machine is operating in the closedloop control. However, in the start-up period, the offset-angle causes instability to the switching from the open-loop to the closed-loop control. An integrated start-up scheme was also presented which combines the HF voltage injection scheme at standstill, lowspeed and the extended back-EMF scheme at medium, high speeds.
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Lee, Jian-Lin, and 李建霖. "Development of Bidirectional Three-phase Induction Machine Drives for Dynamometer with Energy Recovery." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/g6bjw7.
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碩士國立臺灣科技大學
電機工程系
105
The thesis aims to develop bidirectional three-phase induction machine drives for dynamometer with the feature of energy recovery when the electric motor under test serves as a prime mover. The bidirectional power conversion consists of power converter, dc-link and power inverter. The three-phase induction machine is operated either in motor or generator mode, corresponding to the motoring or braking operation of the electric motor under test. Under motor mode, indirect rotor field-oriented control is introduced. The feedback signals of three-phase current, rotor position and speed are obtained for current vector as well as speed closed-loop controls. Whereas, for induction generator under grid-connected operation, the reversed three-phase power conversion and digital phase-lock loop are designed to calculate the phase angle of power grid to facilitate synchronous frame transformation for the dc voltage and current closed-loop controls. System simulation is given using Matlab/Simulink. A 32-bit digital signal processor, TMS320F28335, is adopted as the control core. Since control strategies are mostly implemented by software program, circuit components are reduced largely. Experimental results show that when the three-phase induction machine is operated in motor mode at 2000 rpm, the power output from the induction motor is 2 kW with the peak phase current and total harmonic distortion (THD) of 12.80 A and 4.31%, respectively, on the motor input; the corresponding values on the grid side are 7.44A and 5.14%. The overall efficiency of the motor drive reaches 76.50%. While in generator mode at 2000 rpm, the mechanical power input to the induction generator is 2 kW, the peak generator phase current and THD are 12.83A and 3.04%, respectively. The corresponding values on the grid side are 5.82A and 4.57%. The overall efficiency of the generator system is 72.69%. The experimental results verify the feasibility of the proposed system.
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Jia-MingSyu and 許家銘. "Diagnosis System of Bearing Fault for Three Phase Induction Motor Based on Support Vector Machine." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/uw52af.
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Chen, Li-Jhen, and 陳力禎. "Cogging Torque and Torque Ripple Reduction Design of Dual Three Phase Permanent Magnet Electric Machine." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/h92euj.
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Wey, Shiuann-Jiunn, and 魏炫浚. "A study on the harmonic impedance of a three-phase induction machine under various operating situations." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/29688321276352344896.
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碩士國立雲林科技大學
電機工程系碩士班
95
This paper deals for a three-phase induction machine operating at motor-mode, grid-connection induction generator(GCIG) and self-excited induction generator(SEIG) harmonic impedance response. This paper utilizes a single-phase equivalent circuit of a three-phase induction machine to be its analytical model and then predicts variations of harmonic impedances. The EMTP/ATPDraw and MATLAB/Simulink are also utilized to simulate harmonic interferences into the three-phase induction machine at different operating situations. Finally, experimental results carried out using a 0.5hp three-phase induction machine confirm the feasibility and validity of the analytical modeling to EMTP/ATPDraw, MATLAB/Simulink simulations.
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Zhong-TingHuang and 黃仲廷. "Application of Support Vector Machine and Neural Network for Bearing Fault Diagnosis System of Three Phase Induction Motors." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/ywr8a8.
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SHEU, RUEY-LONG, and 許瑞龍. "Experimental study of a two-dimension perturbation and observation algorithm for improving the unbalanced operation of a three-phase induction machine in motor and generator modes." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/qj49su.
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博士國立雲林科技大學
工程科技研究所
104
To address the voltage unbalance issues of the single-phase powered three-phase induction motor and the three-phase self-excited induction generator supplying single-phase loads, a novel balancing scheme with PC-based control called the two-dimensional perturbation and observation method is proposed and implemented. In the first part, the balancing scheme is composed of two static Var compensators (SVCs) in Steinmetz connection, and is modeled and analyzed by the positive- and negative-sequence equivalent circuits of the three-phase induction motor. The steady-state analysis allows the proper values of the energy-storage elements that balance the motor to be found. Simulations using the EMTP have shown that the motor can be balanced from starting to full load by adjusting the SVCs' firing angles. In the second part, the induction motor is operated as a self-excited induction generator. Appropriate control of the SVC firing angles also allows the single-phase loaded generator to work in a balance condition. Finally, a practical 0.5 HP cage induction motor with SVCs is used in the motor mode and the generator mode to test the PC-based control interface. The testing results indicate that the experimental results are in very good agreement with the simulation results, which demonstrates that the proposed PC-based control interface is feasible and can have more future applications.
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Hsieh, Meng Ju, and 謝孟如. "Parameter Identification of Three-phase Induction Machines." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/41259286733237303150.
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碩士長庚大學
電機工程學系
99
The purpose of this thesis is to develop a measurement system which is suitable for users to measure parameters and operating characteristics of induction machine on site. In this study, parameters and operating characteristics of three-phase induction machine will be determined from the free acceleration and deceleration tests with the measurement of single-phase voltage and current signals. First, the method to determine the induction machine operating characteristics in the all periods of free acceleration and deceleration tests is introduced. The IEEE standard test procedure for polyphase induction motors and generators(IEEE Std. 112) is also introduced. A 5hp induction motor is tested accuracy to the IEEE Std. 112. The parameters obtained from the test are used as a basis for comparison. Use of the NI-DAQmx data acquisition card and Labview program implements the identification system for the same 5hp induction motor. The determined parameters are then used in the Matlab/Simulink simulations to verify the effectiveness of the proposed method.
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Hsiao, Chun-Yu, and 蕭鈞毓. "Analysis and Design of Six-Phase and Double Three-Phase Windings Permanent-Magnet Synchronous Machines." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/frjmsg.
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碩士國立臺灣科技大學
電機工程系
95
Abstract The thesis is devoted to the analysis and design of novel six-phase and double three-phase windings permanent-magnet synchronous motors (PMSM) for low-speed and high-torque applications. The proposed six-phase and double three-phase windings structure, which consists of six windings in stator, could divide the current of the motor driver evenly and improve the machine safety. The 22 poles over the rotor surface are embedded by interior permanent-magnet, while 24 slots for six windings are distributed in the stator. The magnetic and electrical characteristics, such as the magnetic field distribution, equivalent rotor magnetic flux distribution, cogging torque and induced voltage etc., are analyzed by finite element electromagnetic-field analysis software package, Flux_2D and Maxwell_2D. The parameters of the motors are used to calculate and evaluate the operating performances of the motor. Finally, the material of the permanent-magnet and geometric dimensions of the PMSM are determined. The prototype designs of both the six-phase and double three-phase windings are first conducted with the characteristics analysis of PMSM, having 240 mm in diameter. For the rotor speed below 300 , the peak induced voltage is linearly proportional to the speed. Furthermore, at 300 , the induced voltage and harmonic distortion measured are 68 V and 7.5 %, respectively for PMSM with six-phase windings, whereas the corresponding values for PMSM with double three-phase windings are 58 V and 3.61 %, respectively. A new structure of PMSM, 250 mm in diameter, is proposed and simulated to overcome the disadvantage existed in the prototype, such as the infected non-sinusoidal waveform of the induced voltage and shaking fluctuation. It is shown that both the voltage harmonic distortion and running operation characteristics are improved significantly, and meet the requirements for six-phase as well as double three-phase windings applications, such as low-speed and high-torque applications etc.
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Wiedenbrüg, Ernesto J. "Measurement analysis and efficiency estimation of three phase induction machines using instantaneous electrical quantities /." 1998. http://hdl.handle.net/1957/8890.
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Lai, Hung-Wei, and 賴弘偉. "DSP-Based Model-Free Predictive Current Control for Dual Three Phase Permanent Magnet Electric Machines." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/4vzq3d.
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Pedram, Omid. "Dynamic stability modification of the standard network with three machines and nine buses in IEEE due to asymmetric two-phase fault and two-phase and two-phase in the ground fault with sliding control mode." Master's thesis, 2016. http://hdl.handle.net/10316/95575.
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Documentos apresentados no âmbito do reconhecimento de graus e diplomas estrangeirosThe purpose of this thesis is to modify the dynamic stability in the standard network with three machines and nine buses in IEEE due to asymmetric two-phase fault and asymmetric two-phase in the ground fault with sliding mode controler in certain places of the system. The analysis method in the time domain uses the positive and negative spatial vectors of the currents and voltages in the network. Sliding mode controler is used to damp the high frequency oscillation and power system stabilizers (PSS) are used to apply additional signals. Using the AVR, the busbar's voltage is kept constant at the nominal values. In this thesis, it is necessary that initial values are obtained based on a Loud-Flow solution.