Dissertations / Theses on the topic 'Induction Design and construction'
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1
Tanner, Maria E. (Maria Elisa) 1983. "Design and construction of an apparatus for induction heating for controlling DNA hybridization." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/32790.
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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.Includes bibliographical references (leaf 40).
The purpose of this investigation was to design and construct a coil that could be used to selectively heat nanoparticles attached to "molecular beacons" or DNA loop/hairpin structures. Testing was conducted to see if the heat would be sufficient to open the molecular beacon by dehybridizing the dsDNA. This was accomplished by developing a series of seven coils that were tested using a network analyzer and through scans conducted on a fluorometer. The initial design requirements for the coil were that it needed to heat the nanoparticle, should be suitable for optical testing, and require a relatively small sample volume. At the end of the design and testing period, however, a coil that met these requirements was not successfully constructed, but two additional design requirements were developed. Through temperature testing, it was realized that the primary heating of the solution was occurring due to the coil being heated through the power. As a result, a coil that eliminates this source of power dissipation needs to be developed through the use of an air gap, water bath, or similar application, which can draw some of the heat away from the solution. Secondly, in constructing the coils, each was wound tightly so that there was a minimal gap between each loop. However, experiments showed that the proximity effect on resistance could not be neglected. This provided information on future possible designs. Therefore, the coil should be wound so that there is at least one wire's width of gap between each loop.
by Maria E. Tanner.
S.B.
2
Legesse, Michael. "Coupled simulation of an indirect field oriented controlled induction motor drive." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116014.
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Conventionally, system simulations of induction motor drives use lumped parameters model of the motor. This approach assumes motor parameters to be constant during the entire operation of the drive. Unfortunately, these are known to vary significantly over the operating range of the motor due to factors such as magnetic saturation, skin effects, and operating temperature. The variations in motor parameters affect motor output and control parameters resulting in degraded drive performance. One way of overcoming this problem is by coupling the field model of the induction motor with the drive simulation. By replacing the lumped parameters model with the field model, the influence of different operating conditions on motor parameters can be taken into account dynamically. In this thesis such an approach is investigated by coupling the finite element analysis of an induction motor with the system simulation of the field oriented controlled drive. The results obtained for the coupled simulation are promising and possible future works to make this method of simulation more accurate and reliable are recommended.
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Gogas, Kyriakos. "Design of a robust speed and position sensorless decoupled P-Q controlled doubly-fed induction generator for variable-speed wind energy applications." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99762.
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Wind energy is a relatively young but rapidly expanding industry. In order for wind generation to be cost effective, it must produce energy at a minimum cost per dollar of investment. Performance characteristics such as power output versus wind speed must be optimized in order to compete with other energy sources. Also, if the utility uses wind power for a part of its generation, the output power of these turbines must have the same high quality and reliability when it enters the utility grid. The ability to vary operating speed is important in wind generation because it allows for an optimization of the transfer of power from the wind to the turbine shaft. Doubly-fed induction generators (DFIG) are an interesting solution for variable-speed systems with limited variable speed range, and are typically used in wind energy conversion systems.The objectives of this thesis are to implement a decoupled P-Q control of a DFIG that does not rely on mechanical sensors and to design a speed and position sensorless algorithm that is robust to variations of the values of the machine parameters. The sensorless DFIG control algorithm presented in this thesis is based on a modified phasedlock loop with an improved positioning algorithm. With the measured stator voltages, stator and rotor currents, the speed and position of the DFIG are estimated. The speed is estimated independent of machine parameters, which results in a significant improvement in speed control robustness to parameter variations. In addition, the algorithm avoids using differentiation, which significantly improves its immunity to noise and does not require the measurement of the rotor voltages. Also, it is shown that the positioning algorithm has an improved operation in generator mode. Although the accuracy of the positioning algorithm is depended on machine parameters; it is shown with the designed controller that the P-Q decoupled control is robust to changes of machine parameters. Theoretical and simulation results are validated on an experimental setup.
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Collins, Edward Randolph Jr. "Torque and speed control of single-phase induction motors using an adjustable amplitude and phase angle auxiliary winding power supply." Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/15472.
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Arnold, David Patrick. "Magnetic Machines for Microengine Power Generation." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4854.
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This dissertation presents an investigation of miniaturized magnetic induction and permanent magnet (PM) machines, intended for use in a microengine. Similar to a macroscale turbogenerator, a microengine comprises a small, gas-fueled turbine engine for converting chemical fuel energy into mechanical power and an integrated electrical generator for converting mechanical power to electrical power. The microengine system is proposed as a revolutionary, high power-density source for portable electronics.
In this research, miniaturized magnetic induction machines and PM machines were designed, fabricated, and characterized. Both types of machines used axially directed magnetic fields and were nominally 10 mm in diameter and 1.5-2.3 mm in thickness. Innovative microfabrication techniques were developed to demonstrate the feasibility of integrating magnetic machines within a bulk-micromachined, silicon-based microengine system.
Two-phase, eight-pole induction machines were constructed within silicon substrates using Cu coils in a laminated, slotted ferromagnetic NiFe or CoFeNi stator core. Silicon etching, wafer bonding, and electrodeposition were used to form all of the magnetic machine components. The induction machines were characterized in motoring mode using tethered rotors and demonstrated motoring torques of up to 2.5 uN-m.
Also, three-phase, eight-pole, surface wound PM machines were built using a hybrid microfabrication/assembly approach. The stators were fabricated by electroplating Cu coils on ferromagnetic NiFeMo (Moly Permalloy) substrates. The rotors were formed by assembling a magnetically patterned SmCo PM with a FeCoV (Hiperco 50) back iron. The PM machines were tested as generators with free-spinning rotors, powered by an air-driven spindle, and demonstrated 2.6 W of mechanical-to-electrical power conversion with continuous DC power generation of 1.1 W at 120 krpm rotor speed.
The primary contributions of this work are (1) the demonstration of microfabricated magnetic machines integrated within bulk-micromachined silicon and (2) the demonstration of multi-watt power conversion from a microfabricated PM generator. These achievements represent progress in the ongoing development of silicon-based microengines, but in addition, the fabrication technologies and device structures may find application in other microsystems.
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Pant, Mondira Deb. "An architectural approach to inductive noise issues in GSI circuits." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/13555.
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Hayes, Monty Bradford. "Design and fabrication of planar inductors for inductive proximity sensors." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-02132009-172614/.
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Wilson, Richard Antony. "Design, construction and testing of a telemetry system and inductive power link for use in engine telemetry." Thesis, De Montfort University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391698.
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Zhang, Yali. "The Role of Negative Emotions in Constructing Meaning in Interactive Contexts." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/132451/1/Yali_Zhang_Thesis.pdf.
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This research explores the potential of negative emotions in creating meaningful user experience. It investigates the transformation of negative emotions during interactions and its functional consequences on meaning perception. The causes of specific negative emotions in different contexts of interactions and their effects on cognition and behaviours were examined. The findings reveal the mechanism of changes in emotions over the course of interactions. The predominant role of negative emotions in the meaning-making process is demonstrated. This research outcome consists of two conceptual models for modelling meaningful experiences and systematic methods of emotion induction in users.
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Yoon, Yong-Kyu. "Micromachined Components for RF Systems." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5264.
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Several fabrication techniques for surface micromachined 3-D structures have been developed for RF components. The fabrication techniques all have in common the use of epoxy patterning and subsequent metallization. Techniques and structures such as embedded conductors, epoxy-core conductors, a reverse-side exposure technique, a multi-exposure scheme, and inclined patterning are presented. The epoxy-core conductor technique makes it easy to fabricate high-aspect-ratio (10-20:1), tall (~1mm) RF subelements as well as potentially very complex structures by taking advantage of advanced epoxy processes. To demonstrate feasibility and usefulness of the developed fabrication techniques for RF applications, two test vehicles are employed. One is a solenoid type RF inductor, and the other is a millimeter wave radiating structure such as a W-band quarter-wavelength monopole antenna. The embedded inductor approach provides mechanical robustness and package compatibility as well as good electrical performance. An inductor with a peak Q-factor of 21 and an inductance of 2.6nH at 4.5GHz has been fabricated on a silicon substrate. In addition, successful integration with a CMOS power amplifier has been demonstrated. A high-aspect-ratio inductor fabricated using epoxy core conductors shows a maximum Q-factor of 84 and an inductance of 1.17nH at 2.6GHz on a glass substrate with a height of 900um and a single turn. Successful W-band monopole antenna fabrication is demonstrated. A monopole with a height of 800um shows its radiating resonance at 85GHz with a return loss of 16dB.
In addition to the epoxy-based devices, an advanced tunable ferroelectric device architecture is introduced. This architecture enables a low-loss conductor device; a reduced intermodulation distortion (IMD) device; and a compact tunable LC module. A single-finger capacitor having a low-loss conductor with an electrode gap of 1.2um and an electrode thickness of 2.2um has been fabricated using a reverse-side exposure technique, showing a tunability of 33% at 10V. It shows an improved Q-factor of 21.5. Reduced IMD capacitors consist of wide RF gaps and narrowly spaced high resistivity electrodes with a gap of 2um and a width of 2um within the wide gap. A 14um gap and a 20um gap capacitor show improved IMD performance compared to a 4um gap capacitor by 6dB and 15dB, respectively, while the tunability is approximately 21% at 30V for all three devices due to the narrowly spaced multi-pair high resistivity DC electrodes within the gap. Finally, a compact tunable LC module is implemented by forming the narrow gap capacitor in an inductor shape. The resonance frequency of this device is variable as a function of DC bias and a frequency tunability of 1.1%/V is achieved. The RF components developed in this thesis illustrate the usefulness of the application of micromachining technology to this application area, especially as frequencies of operation of RF systems continue to increase (and therefore wavelengths continue to shrink).
11
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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Westerhoff, Kevin M. (Kevin Matthew) 1978. "Construction based design." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/84827.
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Kibby, Devon. "Comparison of methodologies for induction motor design." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=121549.
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In the last few decades, the world of electric machine design, specifically induction machine design, has been reinvigorated by the introduction of power electronics. Where designers were once limited to a single alternating current waveform with constant voltage and frequency, power electronics have thrown all those assumptions out the window. The change has necessitated new design methods that go beyond the typical induction motor electrical equivalent circuit seen in every textbook for the last century and have sent designers back to first principles. With that sentiment, early induction motor invention and improvements are explored. It is shown that even though the development and commercialization of the induction motor was quite rapid, the theory and understanding of the underlying physics kept pace. Basic design methodologies and tools, including the Hopkinson magnetic circuit and the Steinmetz equivalent circuit, from the so-called "'Golden Age' of induction motor development" are traced forward through textbook examples to support the claim. Newer electric machine analyses are presented in the form of the modern treatment of the magnetic equivalent circuit, MEC, and the finite element method, FEM. A derivation of the MEC element from the magnetic scalar potential is completed utilizing the theory of tubes and slices to give a more tangible justification to the field assumptions made. The knowledge from these assumptions is then applied to the FEM to show how to construct an MEC element using the FEM. Tellegen's theorem is applied to the MEC and a brief example given showing how one might compute the first-order sensitivity of a small change in stator windings in an induction motor to a small change in torque. A brief overview of the engineering design process is described with a focus on augmentation with computer aided design tools, CAD. The equivalence shown between the MEC and FEM is used to support the idea that a FEM-based electric machine CAD package could be modified to utilize MEC assumptions or knowledge in order to reduce computation time when coarser models are favored, such as in the early design stages.Depuis les dernières quelques décennies, l'industrie de la conception de la machine électrique, spécifiquement la conception de moteur à induction, a été revigoré par l'introduction des électroniques de puissance. Là ou les concepteurs étaient jadis limités à un courant alternatif avec fréquence et voltage constant, l'électronique de puissance est venue compliquer les lignes directrices de la conception. Ces changements ont nécessité des nouvelle méthodes qui vont au-delà du circuit équivalent typique mentionné dans tous les livres de référence depuis le dernier siècle et ont reporté les concepteurs aux principes de base. C'est à partir de cette complication que l'évolution du moteur à induction depuis son invention est revisitée. Il a été démontré que, malgré son développement et sa commercialisation notablement rapides, la théorie du moteur à induction et notre compréhension des principes physiques ont suivi le rythme. Les méthodologies de base et outils de conception provenant du soi-disant âge d'or du moteur à induction, notamment le circuit magnétique Hopkins et le circuit équivalent Steinmetz, sont retracés dans les exemples à travers les livres de référence pour supporter la thèse. L'analyse des machines électriques actuelles est présentée sous la forme du circuit magnétique équivalent (MEC) moderne et par le calcul par éléments finis (FEM). Une dérivation du MEC à partir du potentiel magnétique vectoriel est réalisée en utilisant la théorie des tubes et tranches pour justifier les hypothèses concernant les champs électromagnétiques. Par la suite, ces hypothèses sont appliquées au calcul FEM pour démontrer la création d'un MEC à partir du calcul FEM. Le théorème de Tellegen est appliqué au MEC et un exemple concret est élaboré pour démontrer comment calculer la sensibilité de premier ordre entre un petit changement dans le bobinage électrique du stator et un petit changement dans le couple.Un bref aperçu du procédé de conception est apporté avec un focus sur la contribution des logiciels de conception assistée par ordinateur (CAD). L'équivalence démontrée entre la méthode du MEC et celle par le calcul FEM est utilisée pour soutenir l'idée que les logiciels CAD basés sur le calcul FEM pourraient être modifiés pour inclure les hypothèses apportées par le MEC dans le but d'économiser le temps de calcul lorsque, durant les étapes préliminaires de la conception, un modèle simple suffirait.
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Horne, Christopher Douglas. "Design and analysis of linear induction accelerators." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309929.
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Eldbib, Khaled. "Design and analysis of rule induction systems." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6841/.
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The RULES family of algorithms is reviewed in this work and the drawback of the variation in their generalisation performance is investigated. This results in a new data ordering method (DOM) for the RULES family of inductive learning algorithms. DOM is based on the selection of the most representative example; the method has been tested as a pre-processing stage for many data sets and has shown promising results. Another difficulty faced is the growing size of training data sets, which results in long algorithm execution times and less compact generated rules. In this study a new data sorting method (DSM) is developed for ordering the whole data set and reducing the training time. This is based on selecting relevant attributes and best possible examples to represent a data set. Finally, the order in which the raw data is introduced to the RULES family algorithms considerably affects the accuracy of the generated rules. This work presents a new data grouping method (DGM) to solve this problem, which is based on clustering. This method, in the form of an algorithm, is integrated into a data mining tool and applied to a real project; as a result, better variation in the classification percentage and a lower number of rules formed has been achieved.
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Weber, Daniel J. M. Eng Massachusetts Institute of Technology. "Design of a battery-powered induction stove." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/100618.
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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2015.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 52-53).
Many people in the developing areas of the world struggle to cook with stoves that emit hazardous fumes and contribute to green house gas emissions. Electric stoves would alleviate many of these issues, but significant barriers to adoption, most notably lack of reliable electric power, make current commercial options infeasible. However, a stove with an input power of 24V DC elegantly solves the issue of intermittent power by allowing car batteries to be used instead of a grid connection, while also allowing seamless integration with small scale solar installations and solar-based micro-grids. However, no existing commercial stoves nor academic research have attempted to create an induction stove powered from a low voltage DC source. This paper presents the design of a low voltage current-fed, full-bridge parallel resonant converter stove. The dynamics of this new topology are discussed in detail and simulations are provided to analyze the behavior. Additionally, a practical implementation of a 500W - 1 kW stove is described. This stove is the first of it's kind and represents a new contribution to both the field of induction cooking and the field of clean cooking solutions for the developing world.
by Daniel J. Weber.
M. Eng.
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Xie, Xiaoling. "Communications in construction design." Thesis, Loughborough University, 2002. https://dspace.lboro.ac.uk/2134/7571.
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Construction design has become an increasingly complex synthesis activity for which effective solutions depend upon co-operative participation by a number of people. Thus communication, including the integration of specialised knowledge and negotiation of differences between team members, is a vital process for collaborative design. A questionnaire survey was initially conducted to investigate communication issues and problems, which had been highlighted from a review of the literature, in current construction design. The results confirmed that communication among the different construction team members is often difficult although of paramount important to design outcomes. Based on these results, case studies have been carried out to gain further insights into communication issues and problems, and explore why and how they are caused. Through the application of multiple approaches, a model has been developed, which suggests strategies that may help participants communicate more effectively and ultimately improve the quality of construction design outcomes.
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Leonard, P. J. "Design and analysis of tubular linear induction motors." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37759.
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Afify, Ashraf A. "Design and analysis of scalable rule induction systems." Thesis, Cardiff University, 2004. http://orca.cf.ac.uk/54539/.
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Machine learning has been studied intensively during the past two decades. One motivation has been the desire to automate the process of knowledge acquisition during the construction of expert systems. The recent emergence of data mining as a major application for machine learning algorithms has led to the need for algorithms that can handle very large data sets. In real data mining applications, data sets with millions of training examples, thousands of attributes and hundreds of classes are common. Designing learning algorithms appropriate for such applications has thus become an important research problem. A great deal of research in machine learning has focused on classification learning. Among the various machine learning approaches developed for classification, rule induction is of particular interest for data mining because it generates models in the form of IF-THEN rules which are more expressive and easier for humans to comprehend. One weakness with rule induction algorithms is that they often scale relatively poorly with large data sets, especially on noisy data. The work reported in this thesis aims to design and develop scalable rule induction algorithms that can process large data sets efficiently while building from them the best possible models. There are two main approaches for rule induction, represented respectively by CN2 and the AQ family of algorithms. These approaches vary in the search strategy employed for examining the space of possible rules, each of which has its own advantages and disadvantages. The first part of this thesis introduces a new rule induction algorithm for learning classification rules, which broadly follows the approach of algorithms represented by CN2. The algorithm presents a new search method which employs several novel search-space pruning rules and rule-evaluation techniques. This results in a highly efficient algorithm with improved induction performance. Real-world data do not only contain nominal attributes but also continuous attributes. The ability to handle continuously valued data is thus crucial to the success of any general purpose learning algorithm. Most current discretisation approaches are developed as pre- processes for learning algorithms. The second part of this thesis proposes a new approach which discretises continuous-valued attributes during the learning process. Incorporating discretisation into the learning process has the advantage of taking into account the bias inherent in the learning system as well as the interactions between the different attributes. This in turn leads to improved performance. Overfitting the training data is a major problem in machine learning, particularly when noise is present. Overfitting increases learning time and reduces both the accuracy and the comprehensibility of the generated rules, making learning from large data sets more difficult. Pruning is a technique widely used for addressing such problems and consequently forms an essential component of practical learning algorithms. The third part of this thesis presents three new pruning techniques for rule induction based on the Minimum Description Length (MDL) principle. The result is an effective learning algorithm that not only produces an accurate and compact rule set, but also significantly accelerates the learning process. RULES-3 Plus is a simple rule induction algorithm developed at the author's laboratory which follows a similar approach to the AQ family of algorithms. Despite having been successfully applied to many learning problems, it has some drawbacks which adversely affect its performance. The fourth part of this thesis reports on an attempt to overcome these drawbacks by utilising the ideas presented in the first three parts of the thesis. A new version of RULES-3 Plus is reported that is a general and efficient algorithm with a wide range of potential applications.
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Ceron, Guerrero Jose Hermilo. "Design of a high specific torque induction motor." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/design-of-a-high-specific-torque-induction-motor(723d535b-d9f0-400d-b0ba-84e77af0e8c0).html.
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Electric vehicles are a key technology in the reduction of our carbon footprint and this has motivated significant research interest. The electrical traction motor is one of the main areas of research in attempts to further improve electric vehicle performance. The permanent magnet motor is the predominant device in this application because of its high specific torque. However, it has suffered from market speculation in the raw magnet materials which has generated efforts to develop electrical machines which have a high specific torque and do not contain rare earth materials. In the past the induction motor used to be the preferred motor for electric vehicles due to its low costs, low maintenance requirements, mature technology and robustness. The induction motor requires a higher specific torque to make it an alternative to permanent magnet machines. For this reason, this research had the primary aim of improving the specific torque of induction machines by undertaking a detailed review of the motor design because this process has conventionally focussed on the requirements for industrial applications. The first stage of the work presented in this thesis consisted of identifying the designs already in use for this purpose and the potential technologies applicable to the induction motor that could be transferred from other electric traction machines. A full review of the design process was also conducted in order to identify the key areas of the process with special reference to the electromagnetic design which used finite element techniques as the main modelling tool. New induction motor designs were developed which showed potential for improving the specific torque; two of these were selected for further refinement, prototyping and testing. Although these designs were modified to facilitate construction, some major difficulties were still encountered during the prototype rotor manufacture. The test results were used to validate the design process and to identify further improvements in the designs. The issues encountered with the rotor manufacture prototype however lead to some overheating during the experimental testing. Comments about the design experience gained during this research are summarized including suggestions for further research.
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Soto, Leticia S. M. Massachusetts Institute of Technology. "Construction design as a process for flow : applying lean principles to construction design." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/42995.
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Thesis (S.M.)--Massachusetts Institute of Technology, System Design and Management Program, 2007.Includes bibliographical references (p. 108-111).
Delays and cost overruns are the rule rather than the exception in the construction industry. Design changes due to lack of constructability late in the construction phase generating costly ripple effect which create delay and disruption throughout the entire organization, are the largest contributors to the stated rule. In the building construction industry, of increased competitiveness, demand from many companies continued effort to develop new methods and tools, in which the design for quality, cost, construability and reliability play an important role. The planning and management of building design has historically focused upon traditional methods of planning such as Critical Path Method (CPM). Little effort is made to understand the complexities of the design process; instead design managers focus on allocating work packages where the planned output is a set of deliverables. This current design method forces design teams to manage their work on a discipline basis, each working on achieving their deliverable as dictated by the design program with little regard of the relationship with other disciplines and organizations. In addition, because Architect and Engineering firms view design and construction as two separate independent phases of work in project it makes it difficult to verify constructability in a design and create flow in the overall process. The goal of this study is to look at how aligning interests, objectives and practices based on lean fundamentals, during the earliest stages of a project, as a method of improving construction performance.
by Leticia Soto.
S.M.
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Larsson, Björn. "Construction of a Calorimetric Test-rig for Loss Measurements on Induction Machines." Thesis, KTH, Elektrisk energiomvandling, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-53677.
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This thesis presents the development and construction of a cooling system and a calorimetric set-up for efficiency measurements on an 11 kW induction machine. Direct and indirect methods of efficiency determination and loss segregation is presented. An analytical thermal model of the machine is used for the estimation of different motor temperatures. The results are verified by measurements. The methodology for calibration of the specific set-up is presented and performed. An accuracy of ・} 5 mK for the calorimetric temperature measurements is obtained. Measurements have been performed in order to determine the thermal leakage of the test-setup. It was found that the main leakage path is through the rotor shaft. According the the measurements performed, this leakage is lower than 1.6 % of the active input power.
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Zhang, Fan 1965. "Construction of an induction machine database for a case-based reasoning system." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79275.
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Case-based reasoning is a field of artificial intelligence research that emphasizes the importance of specific past experiences to the solution of new problem. The ability to suggest a solution to a novel problem based on the recall and reuse of specific experiences is a tenet of the case-based reasoning paradigm. It has grown out of cognitive theories concerned with functional justifications for the dynamic properties of human memory, and is growing into a technology for expert systems. Studies examining the use of cases in design have identified a broad range of application. This approach is well suited for the engineering design domain. Cases can suggest entire or partial solutions, help decompose problems, critique proposed designs, point to opportunities or suggest relevant design criteria.The goal of this thesis is to develop a case database for induction motors and to test it using a previously developed Case Based Reasoning system. The testing results show that the CBR's adaptation mechanism system (previous work of Dr. Quang) which combines different knowledge sources and multiple reasoning paradigms can provide a dynamic environment for examining different design requirements and suggest ways for solving design problems from its routine and non-routine to creative design.
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Sebille, Michel. "Design :construction, automorphisms and colourings." Doctoral thesis, Universite Libre de Bruxelles, 2002. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211428.
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Chew, En Phin. "Superconducting Transformer Design and Construction." Thesis, University of Canterbury. Electrical and Computer Engineering, 2010. http://hdl.handle.net/10092/4977.
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This thesis first outlines the testing undertaken on a partial core superconducting
transformer under open circuit, short circuit, full load and endurance test conditions.
During the endurance test, a failure occurred after 1 minute and 35 seconds. During the
failure, voltage dipping and rapid liquid nitrogen boil off was observed. This prompted
a failure investigation which concluded that the lack of cooling in the windings was the
most probable cause to the failure.
Full core transformer and superconductor theories are then introduced. A copper
winding transformer model, based on a Steinmetz equivalent circuit and a reverse
design method, is described. A superconductor loss model which outlines the different
types of losses experienced under AC conditions is used to determine the resistance
of the windings in the Steinmetz equivalent circuit. This resistance changes with the
magnitude of current and the strength of the magnetic field that is present in the gaps
between each layer of the windings. An alternative leakage flux model is then presented,
where the flux is modelled based on the combination of the reluctance of the core and
the air surrounding the windings. Based on these theories, an iterative algorithm to
calculate the resistance of the superconductor is developed.
A new design of a 15kVA single phase full core superconducting transformer, operating
in liquid nitrogen, is presented. The issues with building the superconducting
transformer are outlined. First, a copper mockup of the superconducting transformer
was designed where the mockup would have the same tape and winding dimensions
as the superconducting transformer, which means the same core can be used for two
different sets of windings. This led to designing a core that could be easily taken apart
as well as reassembled. Construction of the core, the copper windings and the superconductor
windings ensued. The process of cutting the core laminations, insulating the
copper and superconductor tapes, and making the steel fasteners and terminations are
described.
The copper mockup and superconducting transformers was then tested under open
circuit, short circuit, different load and endurance conditions at both liquid nitrogen
and room temperatures. These test results were then compared with the those from
two models. The comparison showed a significant inaccuracy in the reactances in
the models. This introduced a correction factor into the superconductor model which
ii
made it more accurate. However, further work is required to explain and quantify the
correction factors for the copper transformer model under different load conditions.
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Wang, Xiaoyan. "Characterization and design of Brushless Doubly-Fed (induction) Machines." Thesis, University of Cambridge, 2008. https://www.repository.cam.ac.uk/handle/1810/252073.
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Oraee, Ashknaz. "Optimal design of the brushless doubly-fed induction generator." Thesis, University of Cambridge, 2016. https://www.repository.cam.ac.uk/handle/1810/283976.
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Hu, Yifei. "Linear Induction Motor Investigation and Design for Articulated Funiculator." Thesis, KTH, Elektrisk energiomvandling, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-177816.
Full textAbstract:
Articulated Funiculator is a new and innovative concept developed by Tyréns forachieving a more efficient vertical transportation with a higher space utilization.Having a variety of merits, i.e.: simple construction, direct electromagneticthrust propulsion, and high safety and reliability in contrast to rotary inductionmotor, linear induction motor (LIM) is considered to be one of the cases as thepropulsion system for Articulated Funiculator. The thesis is then carried outwith the purpose of determining the feasibility of this study case by designing theLIMs meeting some specific requirements. The detailed requirements include: aset of identical LIMs are required to jointly produce the thrust that is sufficientto vertically raise the moving system up to 2 m/s2; the size of the LIMs cannotexceed the specification of the funiculator; the maximum flux density in the airgap for each LIM is kept slightly below 0.6 T; no iron saturation of any part ofthe LIMs is allowed.In this thesis report, an introduction of LIM is firstly presented. Followingthe introduction, relevant literature has been reviewed for a strengthenedtheoretical fundamentals and a better understanding of LIM’s history and applications. A general classification of LIMs is subsequently introduced. In addtion,an analytical model of the single-sided linear induction motor (SLIM) has beenbuilt based on an approximate equivalent circuit, and the preliminary geometryof the SLIM is thereby obtained. In order to acquire a more comprehensiveunderstanding of the machine characteristics and a more precise SLIM design, atwo-dimensional finite element method (2D-FEM) analysis is performed initiallyaccording to the preliminary geometry. The results, unfortunately, turn out tobe iron severely saturated in the teeth and yoke, and a excessive maximumvalue of air-gap flux density. Specific to the problems, different parameters ofthe SLIM are marginally adjusted and a series of design scenarios are run inFlux2D for 8-pole and 6-pole SLIM. The comparisons between the results areconducted and the final solution is lastly chosen among them.Articulated Funiculator är ett nytt och innovativt koncept som utvecklats av Tyréns för att möjilggöra en mer effektiv vertikal transport och bättre utnyttjautrymme. Tack vare fördelar såsom en enkel konstruktion, direkt elektromagnetiskdragkraftsframdrivning, samt hög säkerhet och tillförlitlighet i motsatstill roterande induktionsmotor, är en linjär induktionsmotor (LIM) aktuell somframdrivningssystem. Detta examensarbete är utfört med syfte att utforma enLIM för att uppfylla vissa specifika krav. De detaljerade kraven inkluderar: enuppsättning identiska LIM krävs för att gemensamt producera tillräcklig dragkraftför att vertikalt höja det rörliga systemet upp till 2 m/s2; storleken påLIM får inte överstiga specifikation; den maximala flödestätheten i luftgapet förvarje LIM hålls är begränsad till knappt 0.6 T; ingen järnmättnad av någon delav LIM är tillåtet. I denna rapport ges först en introduktion av LIM-konceptet. Efter introduktionenhar relevant litteratur granskats för att stärka teoretiska grundkunskapersamt ge en bättre belysning av historiken kring LIMs samt dess applikationer. Utöver detta har en analytisk modell av den ensidiga linjära induktionsmotorn(SLIM) byggts, baserat på en ungefärlig ekvivalent krets med vilket den preliminärageometrin för SLIM. För att erhålla en mer grundläggande förståelse avmaskinens egenskaper är en tvådimensionell analys med finita elementmetoden(2D-FEM) utförd, initialt med användande av en preliminär geometri erhållenmed hjälp av analytisk dimensionering. Resultaten från dessa simuleringar visadedock att järnet mättats kraftigt i både tänderna och oket och ett överdrivetstort maximivärde av luftgapets flödestäthet erhålls. Specifikt för applikationenjusteras olika parametrar och en rad driftscenarier körs i Flux2D för en 8-poligoch en 6-polig SLIM. En slutgiltig jämförelse mellan de olika maskindesignernapresenteras och den rekommenderade lösningen väljs slutligen.
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Barros, Rodrigo Coelho. "On the automatic design of decision-tree induction algorithms." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-21032014-144814/.
Full textAbstract:
Decision-tree induction is one of the most employed methods to extract knowledge from data. There are several distinct strategies for inducing decision trees from data, each one presenting advantages and disadvantages according to its corresponding inductive bias. These strategies have been continuously improved by researchers over the last 40 years. This thesis, following recent breakthroughs in the automatic design of machine learning algorithms, proposes to automatically generate decision-tree induction algorithms. Our proposed approach, namely HEAD-DT, is based on the evolutionary algorithms paradigm, which improves solutions based on metaphors of biological processes. HEAD-DT works over several manually-designed decision-tree components and combines the most suitable components for the task at hand. It can operate according to two different frameworks: i) evolving algorithms tailored to one single data set (specific framework); and ii) evolving algorithms from multiple data sets (general framework). The specific framework aims at generating one decision-tree algorithm per data set, so the resulting algorithm does not need to generalise beyond its target data set. The general framework has a more ambitious goal, which is to generate a single decision-tree algorithm capable of being effectively applied to several data sets. The specific framework is tested over 20 UCI data sets, and results show that HEAD-DTs specific algorithms outperform algorithms like CART and C4.5 with statistical significance. The general framework, in turn, is executed under two different scenarios: i) designing a domain-specific algorithm; and ii) designing a robust domain-free algorithm. The first scenario is tested over 35 microarray gene expression data sets, and results show that HEAD-DTs algorithms consistently outperform C4.5 and CART in different experimental configurations. The second scenario is tested over 67 UCI data sets, and HEAD-DTs algorithms were shown to be competitive with C4.5 and CART. Nevertheless, we show that HEAD-DT is prone to a special case of overfitting when it is executed under the second scenario of the general framework, and we point to possible alternatives for solving this problem. Finally, we perform an extensive experiment for evaluating the best single-objective fitness function for HEAD-DT, combining 5 classification performance measures with three aggregation schemes. We evaluate the 15 fitness functions in 67 UCI data sets, and the best of them are employed to generate algorithms tailored to balanced and imbalanced data. Results show that the automatically-designed algorithms outperform CART and C4.5 with statistical significance, indicating that HEAD-DT is also capable of generating custom algorithms for data with a particular kind of statistical profileÁrvores de decisão são amplamente utilizadas como estratégia para extração de conhecimento de dados. Existem muitas estratégias diferentes para indução de árvores de decisão, cada qual com suas vantagens e desvantagens tendo em vista seu bias indutivo. Tais estratégias têm sido continuamente melhoradas por pesquisadores nos últimos 40 anos. Esta tese, em sintonia com recentes descobertas no campo de projeto automático de algoritmos de aprendizado de máquina, propõe a geração automática de algoritmos de indução de árvores de decisão. A abordagem proposta, chamada de HEAD-DT, é baseada no paradigma de algoritmos evolutivos. HEAD-DT evolui componentes de árvores de decisão que foram manualmente codificados e os combina da forma mais adequada ao problema em questão. HEAD-DT funciona conforme dois diferentes frameworks: i) evolução de algoritmos customizados para uma única base de dados (framework específico); e ii) evolução de algoritmos a partir de múltiplas bases (framework geral). O framework específico tem por objetivo gerar um algoritmo por base de dados, de forma que o algoritmo projetado não necessite de poder de generalização que vá além da base alvo. O framework geral tem um objetivo mais ambicioso: gerar um único algoritmo capaz de ser efetivamente executado em várias bases de dados. O framework específico é testado em 20 bases públicas da UCI, e os resultados mostram que os algoritmos específicos gerados por HEAD-DT apresentam desempenho preditivo significativamente melhor do que algoritmos como CART e C4.5. O framework geral é executado em dois cenários diferentes: i) projeto de algoritmo específico a um domínio de aplicação; e ii) projeto de um algoritmo livre-de-domínio, robusto a bases distintas. O primeiro cenário é testado em 35 bases de expressão gênica, e os resultados mostram que o algoritmo gerado por HEAD-DT consistentemente supera CART e C4.5 em diferentes configurações experimentais. O segundo cenário é testado em 67 bases de dados da UCI, e os resultados mostram que o algoritmo gerado por HEAD-DT é competitivo com CART e C4.5. No entanto, é mostrado que HEAD-DT é vulnerável a um caso particular de overfitting quando executado sobre o segundo cenário do framework geral, e indica-se assim possíveis soluções para tal problema. Por fim, é realizado uma análise detalhada para avaliação de diferentes funções de fitness de HEAD-DT, onde 5 medidas de desempenho são combinadas com três esquemas de agregação. As 15 versões são avaliadas em 67 bases da UCI e as melhores versões são utilizadas para geração de algoritmos customizados para bases balanceadas e desbalanceadas. Os resultados mostram que os algoritmos gerados por HEAD-DT apresentam desempenho preditivo significativamente melhor que CART e C4.5, em uma clara indicação que HEAD-DT também é capaz de gerar algoritmos customizados para certo perfil estatístico dos dados de classificação
30
Leung, Chi-ming. "Design consultancy vs design and build consultancy : present trends in the construction industry /." Hong Kong : University of Hong Kong, 1995. http://sunzi.lib.hku.hk/hkuto/record.jsp?B14038869.
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Guldemir, Hanifi. "Prediction of induction motor line current spectra from design data." Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287180.
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Brown, Christopher P. (Christopher Perry). "Design for manufacturability of a high-performance induction motor rotor." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/38170.
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Sinha, Ujjwal. "A design and optimization assistant for induction motors and generators." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50391.
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Khan, Irshad. "Analysis and design of a high frequency induction-heating system." Master's thesis, University of Cape Town, 2003. http://hdl.handle.net/11427/17437.
Full textAbstract:
Includes bibliographical references.Advances in power electronic semiconductor technology are making high frequency converters for induction heating more feasible at power levels up to 50kW. This research presents the development and analysis of a solid-state induction-heating system, operating directly off single-phase mains frequency, which enables optimum and efficient operation over a frequency range of 80kHz to 200kHz. The system essentially comprises a DC-DC converter configured as a controlled current source, which feeds a load resonant DC-AC inverter, driving a parallel resonant load circuit. The load circuit comprises an induction-heating coil and a reactive power compensating capacitor. The systems active switching elements comprise power MOSFET's but can be extended to almost any other controlled power devices such as IGBT's, BJT's, SCR's, GTO's or SIT's. An automatic frequency control system ensures that the DC-AC inverter drives the load at its resonant frequency, thereby achieving zero voltage switching of the power semiconductors. This operating mode always ensures maximum power transfer to the load as well as maximum operating efficiency of the DC-AC inverter. Driving the load at resonance presents an essentially resistive load to the DC-DC converter, thereby reducing the losses associated with a reactive load. A compact circuit layout combined with this optimum mode of operation eliminates the need for any snubber circuit components in both the DC-DC and DC-AC converters at this power level. An overview into various applications and technologies of induction-heating is presented in this research. A detailed analysis of the induction-heating coil and work- piece are presented in order to aid the design of the load circuit. The induction-heating technology overview presents various induction-heating power sources, discussing the configurations of various topologies. A brief mathematical analysis is used to describe the operation of power electronic converters employed in the induction-heating system developed for this research. The parallel resonant induction-heating load circuit is characterised mathematically, allowing for the determination of the optimum operating conditions. This is followed by a simulation analysis, which is used to gain insight into the problem of frequency control. The frequency control system is modelled and the steady-state error response evaluated under different input conditions. Experimental results on the system implemented, based on operating waveforms and efficiency measurements of the solid-state induction-heating system are presented along with recommendations for future work. The implemented power source was tested at a maximum power of 2.3kW at 151kHz. A system efficiency of 86% at 1.3kW was measured when operating at 138kHz. This design however, provides for scaling to power levels up to 50kW. The induction-heating system's frequency tracking capability is evaluated by heating a steel work-piece through its Curie transition temperature. The induction-heating system is used to heat a 26mm x 35mm stainless-steel billet (work-piece) to 1200°C in 130 seconds using the calculated power of 1.35kW .
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Ferguson, A. J. L. "Dilution refrigerator : Design, construction and performance." Thesis, University of Ulster, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378638.
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Chis, Lucian. "Testing and modeling of the single-phase Written-Pole Motor." Thesis, 1998. http://hdl.handle.net/1957/33457.
Full textAbstract:
A relatively new development in the electric machines field has been the written-pole technology, of which the latest product is the large single-phase electric motor, the single phase Written-Pole Motor (WPM). The WPM is a synchronous, permanent-magnet single-phase motor having a weak rotor cage for start-up which in addition exhibits significant hysteresis effects at speeds below or above true synchronism. The electrical configuration of the WPM places it in the capacitor-start capacitor-run category of single-phase motors, due to the large size and need for an approximation of a round rather than elliptic rotating magnetic field.
This thesis presents the results of the research conducted by the author in the Motor Systems Resource Facility (MSRF) of the Electrical and Computer Engineering Department at Oregon State University. The thesis is structured into two main parts: Testing and Modeling.
The tests conducted on the WPM were trying to independently verify manufacturer's claims with regards to efficiency, power factor, robustness, power-outage ride-through and furthermore to study the behaviour of the machine during voltage sags, overvoltages and undervoltages. Tests were conducting in order to develop a
mathematical model from which the performance of the machine can be predicted.
The modeling efforts were concentrated in the development of a comprehensive model which would include all three major aspects of the WPM, and the performance of the resulting model was compared with the sampled data.Graduation date: 1999
37
Boger, Michael S. "General pole number model for the brushless doubly-fed machine." Thesis, 1994. http://hdl.handle.net/1957/35261.
Full textAbstract:
The Brush less Doubly-Fed Machine (BDFM) has the potential to be a more cost
effective replacement for conventional induction or synchronous machine drives. The
BDFM has two stator windings: a power winding and a control winding. An electronic
power converter of variable voltage and frequency is connected to the control winding and
allows the speed of the machine to be adjusted synchronously. The power winding, by
design, carries the majority of the current needed for operation, the control winding only a
fraction of the current, thus enabling the converter rating to be as low as 25% of the rating
of the machine depending on the speed range of operation.
To date, only one specific stator pole-pair combination has been investigated,
namely the 3/1 combination, where 3 and 1 refer to the power winding pole-pairs and the
control winding pole-pair, respectively. Since the speed of the machine is dependent on
the sum of the pole-pairs of the stator windings, a general pole numbered model is needed
to evaluate the performance of such general machines with other pole-pair number
machines. The BDFM describing system equations are transformed to the two axis (dq)
rotor reference frame using a power invariant transformation. The analysis shows an
additional term involving the common bar impedance which was not present in earlier
analyses.
The dynamic model is simplified to yield a steady state synchronous model. The synchronous frequency of analysis is investigated which results in two equivalent steady state models. The models developed can easily handle excitation of any frequency or sequence on the control winding without the use of an auxiliary model as used in previous analyses. The voltage forced model predictions match data taken for a 5 hp BDFM laboratory prototype, establishing the validity of the analysis. The model is used in illustrating the torque producing capabilities and unity power factor operation of the machine under a variety of inputs. Using the model, predictions are made on a different pole-pair combination machine (4/2 BDFM) for use as a 60 hp pump drive as an alternative to a 3/1 BDFM for the same application.Graduation date: 1995
38
Choi, Ji-Hoon. "Model based diagnostics of motor and pumps." Thesis, 2006. http://hdl.handle.net/2152/2849.
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Lewis, Timothy M. "Development of a 300 Hp regenerative motor and generator test facility." Thesis, 1995. http://hdl.handle.net/1957/34696.
Full textAbstract:
A 300 hp motor and generator testing facility is being completed at Oregon
State University. The testing center is the largest independent testing facility west of
the Mississippi River. This regional resource center will incorporate state-of-the-art
features that set it apart from other testing facilities. An induction machine with a
modem regenerative power electronic converter is being used as the dynamometer.
This regenerative dynamometer system significantly reduces the amount of power
necessary for testing, allows for extremely flexible computer controlled testing, and is
able to test adjustable speed machine systems from 100-4000 r/min. The
dynamometer system is able to fully test both motors and generators of 240 hp from
no-load to 125% rated load. A virtual instrumentation system provides tremendous
flexibility and measures instantaneous, rms, and spectral signal values.
Because the system is designed for testing over a wide speed range, it is
necessary that all dynamometer losses are isolated and tabulated for the entire speed
range. Initial fixed speed testing was performed on a 60 hp induction motor and
standard report formats were generated for this and future test center use. The results
were compared to the manufacturer's original testing data. To demonstrate the ability
to test generators by using the dynamometer as a prime mover, a set of tests were also
performed on a synchronous machine in accordance with IEEE standards.Graduation date: 1996
40
"A digital-PID-control single-inductor triple-output (SITO) DC-DC converter with pre-sub-period inductor-current regulation." Thesis, 2010. http://library.cuhk.edu.hk/record=b6074845.
Full textAbstract:
In this thesis, a digital-PID-control single-inductor triple-output (SITO) DC-DC converter is realized in AMS 0.35mum CMOS technology. The size of the chip is about 1600 mum x 1700 mum. To improve load current and reduce cross regulation, a Pre-Sub-Period inductor-current regulation is proposed. Based on the maximum duty cycle limiter, an adaptive inductor current adjustment is realized when the duty cycle of the digital PWM signal is larger than the set maximum duty cycle. By an optimized phase control sequence, the S&H stages of the feedback switching and ADC are controlled to on/off with a minimized delay time. Moreover, the control sequence can virtually remove the setting time.Multiple voltage supplies are necessary to satisfy the different voltage supply requirements of the different on-chip blocks to reduce power consumption in modem electronic devices, such as the modem embedded systems, the portable devices, personal computing devices and wireless communications and imaging systems. For example, WiMAX transmitter includes different sub-blocks: Baseband processor, IQ modulator and power amplifier. Different blocks should operate with the different power supply voltages to satisfy the different requirements.
Single-input multiple-output DC-DC converter is presented to provide the different voltage supplies and reduce the cost on the elements such as the inductor on PCB and save PCB area. Meanwhile, to remove cross regulation and improve load driving capability, the DC-DC converter should operate in the pseudo-continuous mode/discontinuous mode (P-CCM/DCM). However, in the previous designs, the DC current in the inductor is fixed. When the load becomes heavy enough, cross regulation will significantly affect across the different sub-converters.
Jia, Jingbin.
"December 2009."
Adviser: KaNang Leung Alex.
Source: Dissertation Abstracts International, Volume: 72-01, Section: B, page: .
Thesis (Ph.D.)--Chinese University of Hong Kong, 2010.
Includes bibliographical references (leaves 121-124).
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Electronic reproduction. Ann Arbor, MI : ProQuest Information and Learning Company, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Electronic reproduction. Ann Arbor, MI : ProQuest Information and Learning Company, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Abstract also in Chinese.
41
"An inductive RFID system with build-in asynchronous ECC crypto-processor." Thesis, 2008. http://library.cuhk.edu.hk/record=b6074553.
Full textAbstract:
Radio Frequency Identification (RFID) has received a great deal of attention in past decades. It is an automatic identification system by replying and retrieving data remotely using RFID transponders. Basically, RFID systems can be divided into three main categories: short transmission range, medium transmission range, and long transmission range.Short and medium range RFIDs generally are passive transponders while long range RFID is of either passive or active type. In this thesis, a short transmission range RFID transponder is presented. This is a passive transponder which generates power for internal circuitry by inductive coupling. For automatic identification applications such as electronic money tickets, the requirements of endurance, weight, size as well as cost appeal to use passive transponder rather than active transponder. Researches on the passive transponders have created a great challenge for engineers in terms of the tradeoff between power constraints, processing power and data transmission range.
The presented RFID transponder system adheres to the ISO 14443 standard Type B specification communication interface, which operates at 13.56MHz carrier frequency with a maximum read range around 50 mm. This research implemented a low power, high security, and long read range RFID transponder. For the analog RF interface, a series of novel architectures are adopted to improve the data transmission range. The digital core in the presented crypto-processor for data security. The asynchronous architecture has the advantages of fast computation time, low power consumption and small area. These are the attractive reasons to implement the core processing units using an asynchronous architecture.
This RFID system was fabricated with a 0.35um two-poly four-metal standard CMOS process with the silicon area of 1516 um x 1625 um. The measurement results show that the analog RF interface can generate a maximum 5.45mW power while the digital core circuit consumes only 2.77mW. In the wireless communication tests, the transponder read range can reach as far as 50 mm.
Leung, Pak Keung.
"June 2008."
Adviser: Choy Chin Sing.
Source: Dissertation Abstracts International, Volume: 70-03, Section: B, page: 1847.
Thesis (Ph.D.)--Chinese University of Hong Kong, 2008.
Includes bibliographical references.
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Abstracts in English and Chinese.
School code: 1307.
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Li, Wei-Ting, and 李威霆. "Adaptive controller design of induction motor." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/80999487544372184730.
Full textAbstract:
碩士國立臺灣科技大學
機械工程系
89
The purpose of this paper is to propose an adaptive controller for induction motor control system. Some of the system parameters are assumed to be unknown time varying without any information of their variation bounds. Traditional adaptive control algorithms are not application to this kind of systems due to their time-varying nature. Here, a function approximation based controller is designed to transform the time-varying parameters into a linear combination of known orthonormal basis. Besides, the singularity problem of the decoupling matrix is dealt with by redesigning the parameter update algorithms. Simulation cases shown that the proposed schemes have excellent performance.
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LEE, PO-I., and 李柏毅. "Monitoring Design of Induction Heating System." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/93664770288193135019.
Full textAbstract:
碩士國立臺南大學
電機工程學系碩博士班
105
This thesis is aimed at developing the hardware circuit with constant temperature and constant power controls for an induction heating system. In the circuit, a series resonance is served as the main structure with the capabilities of soft-switching and load-impedance monitoring such that the system operation efficiency can be improved. In addition, based on the resonant current and voltage feedback implementation, a phase-locked loop (PLL) has also been developed for much precise resonant management under each heating step. Besides, via the developed PLL circuit to formulate the relationships between the output power and switching frequency as a linear function, the output power of system can be then controlled and becomes insensitive to load temperature variations. In order to solidify the practicality of this circuit design, mathematical analyses and experimental validations have been thoroughly performed. Test results help confirm the effectiveness of the method, demonstrating its feasibility and practicality for high-frequency drive industry applications. Keywords: Induction heating, inverter, constant temperature control, constant power control.
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HSIAO, JA-TI, and 蕭家丁. "Design of Fuzzy Controller for Induction Motor." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/55904130111702000470.
Full textAbstract:
碩士國立海洋大學
電機工程學系
89
The main purpose of this thesis is to study the design of a fuzzy speed controller for the three-phase induction motor. The method of fuzzy theory is suitable for the analysis of multi-input multi-output (MIMO) nonlinear systems of which controllers are not easily implemented by classical methods. In the thesis, a preliminary set of control rules is constructed using Mamdani type of inference system and an input-output data set is generated from the preliminary set of control rules. Due to the compact and efficient form of linear representation of the Sugeno type fuzzy rules, a set of Sugeno type fuzzy control rules is then obtained from the input-output data set by employing the Adaptive Network-based Fuzzy Inference System (ANFIS). This set of Sugeno type fuzzy control rules, with the speed error and the change of speed error being input quantities, forms the speed controller for the three-phase induction motor. Moreover, the self-tuning mechanism is applied to improve the steady-state error. Through an experimental motor control system for the three-phase induction motor, the proposed fuzzy logic controller has been tested under several different operating conditions. The results illustrate that the proposed fuzzy controller has the features of robustness to load variation.
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Yang, Jyh Shiaan, and 楊智顯. "Servo Controller Design of AC Induction Motor." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/36398023896972971198.
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Amrhein, Marco. "Induction machine performance improvements : design-oriented approaches /." 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3269832.
Full textAbstract:
Thesis (Ph. D.)--University of Illinois at Urbana-Champaign, 2007.Source: Dissertation Abstracts International, Volume: 68-06, Section: B, page: 3997. Adviser: Philip T. Krein. Includes bibliographical references (leaves 122-135). Available on microfilm from Pro Quest Information and Learning.
47
Brown, Ian P. "Design rules for induction machine self-sensing." 2009. http://www.library.wisc.edu/databases/connect/dissertations.html.
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蔡正爵. "Computer-Aided Design of Induction Motor Drives." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/57348451109906511419.
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Wu, Ming-Jheng, and 吳明政. "Induction Motor Driver Design and Vector Control." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/28881638872586406273.
Full textAbstract:
碩士國立中正大學
機械工程學系暨研究所
101
This thesis describes how I to creat a vector control system for an induction motor. First analyzed the model of the induction motor, and then research the viability of two control theories, scalar control and vector control. It was decided upon to use vector control. I also researched vector control theory of torque control and speed control. Then I identified the system parameters which are required in order to implement vector control. The experiments used were DC, Stall-signal phase, and no load. Finally I introduced the driver, which was designed by my department. In the implementation I used TMS320- 28335 digital signal processor (DSP) microcontroller, designed by Texas Instruments and the DSP control card which was produced by C.C.U. Auto-Control Lab. I then conducted the induction motor experiments on the driver and firmware in order to verify the feasibility of an induction motor vector control systems via a driver and DSP is acceptable.
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Hsu, I.-Chi, and 許以奇. "The Poetics of Construction─NTUT Footbridge Construction Design." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/39022922066860636577.
Full textAbstract:
碩士國立臺北科技大學
建築與都市設計研究所
90
The construction design including structural design and structural system is the framework of design . From a viewpoint of tectonics theory, the construction design is by Natural Law composed of art and skill、science and technology、the construction logic and the original force relationship derived from material characteristics. The construction design supplies the architectural design a thinking direction which is a meaning of space in heterogeneous with implemental layers. It can be developed to be the originality communication bridge between the domain of design and engineering, and more to create the dialectical relationship between human being and the construction natural law. The construction which full of humanism value is generally called as “the poetics of construction”. The traditional mode of current Taiwanese building production is designed mainly by duplicating the space form operation of the symbolical codification and neglecting material、construction、structure and the co-life relationship between the architecture and regional environment according to the late modern principle. Using the NTUT footbridge design as an example, the construction design is processed to explore the transformation from deep structure nature to space and to realize the highest meaning of “the poetics of construction”. According to the issue of construction、tectonics、materials、details、joints and forces, the problems of this design can be breakdown. The goal situations, the poetics of dazzling、the intricate rattan and the incarnation of pure truth, are obtains by combining the essential factor of environment. Then the final definition is achieved；the obviousness of unlimited force can be regarded as the principle of space structure translation.