Relevant bibliographies by topics / Switching machines

Academic literature on the topic 'Switching machines'

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Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Switching machines"

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Zhang, Yongdeng, María Lara-Tejero, Jörg Bewersdorf, and Jorge E. Galán. "Visualization and characterization of individual type III protein secretion machines in live bacteria." Proceedings of the National Academy of Sciences 114, no. 23 (May 22, 2017): 6098–103. http://dx.doi.org/10.1073/pnas.1705823114.

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Type III protein secretion machines have evolved to deliver bacterially encoded effector proteins into eukaryotic cells. Although electron microscopy has provided a detailed view of these machines in isolation or fixed samples, little is known about their organization in live bacteria. Here we report the visualization and characterization of theSalmonellatype III secretion machine in live bacteria by 2D and 3D single-molecule switching superresolution microscopy. This approach provided access to transient components of this machine, which previously could not be analyzed. We determined the subcellular distribution of individual machines, the stoichiometry of the different components of this machine in situ, and the spatial distribution of the substrates of this machine before secretion. Furthermore, by visualizing this machine inSalmonellamutants we obtained major insights into the machine’s assembly. This study bridges a major resolution gap in the visualization of this nanomachine and may serve as a paradigm for the examination of other bacterially encoded molecular machines.
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Ilhan, E., T. E. Motoasca, J. J. H. Paulides, and E. A. Lomonova. "Energy Conversion Loops for Flux-Switching PM Machine Analysis." Engineering, Technology & Applied Science Research 2, no. 5 (October 6, 2012): 285–90. http://dx.doi.org/10.48084/etasr.209.

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Induction and synchronous machines have traditionally been the first choice of automotive manufacturers for electric/hybrid vehicles. However, these conventional machines are not able anymore to meet the increasing demands for a higher energy density due to space limitation in cars. Flux-switching PM (FSPM) machines with their high energy density are very suitable to answer this demand. In this paper, the energy conversion loop technique is implemented on FSPM for the first time. The energy conversion technique is a powerful tool for the visualization of machine characteristics, both linear and nonlinear. Further, the technique provides insight into the torque production mechanism. A stepwise explanation is given on how to create these loops for FSPM along with the machine operation.
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Kim, Jang, Chung, and Hwang. "A New Outer-Rotor Hybrid-Excited Flux-Switching Machine Employing the HTS Homopolar Topology." Energies 12, no. 14 (July 10, 2019): 2654. http://dx.doi.org/10.3390/en12142654.

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Currently, studies of flux switching machines are actively underway owing to several advantages of these machines, including their sturdy rotor structure and high output capability. This paper deals with an outer-rotor hybrid-excited flux-switching machine (FSM). The proposed machine embraces a homopolar structure and utilizes permanent magnets (PMs) for field excitation and a high-temperature superconducting (HTS) coil for flux regulation. The stator houses the HTS field coil, PMs, and armature windings. The outer rotor consists solely of an iron core. Thus, the machines are cost effective and can serve as a solution to the design and fabrication complexities of field current supplying and cooling systems. In this paper, the machine performance outcomes are analyzed using the 3D finite element method (FEM), and the validity of the proposed machine is verified.
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Masoud, M. I., and A. S. Abdelkhalik. "Performance Evaluation of Eleven-Phase Induction Machine with Different PWM Techniques." Journal of Engineering Research [TJER] 12, no. 1 (June 1, 2015): 1. http://dx.doi.org/10.24200/tjer.vol12iss1pp1-14.

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Multiphase induction machines are used extensively in low and medium voltage (MV) drives. In MV drives, power switches have a limitation associated with switching frequency. This paper is a comparative study of the eleven-phase induction machine’s performance when used as a prototype and fed sinusoidal pulse-width-modulation (SPWM) with a low switching frequency, selective harmonic elimination (SHE), and single pulse modulation (SPM) techniques. The comparison depends on voltage/frequency controls for the same phase of voltage applied on the machine terminals for all previous techniques. The comparative study covers torque ripple, stator and harmonic currents, and motor efficiency.
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Shuraiji, Ahlam Luaibi, and M. M. J. Al-ani. "Design and optimization of HTS flux-switching permanent magnet machine." International Journal of Power Electronics and Drive Systems (IJPEDS) 10, no. 4 (December 1, 2019): 1751. http://dx.doi.org/10.11591/ijpeds.v10.i4.pp1751-1757.

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<p>Flux-switching permanent magnet (FSPM) machine with high temperature superconductors (HTS) bulks located between the rotor poles to eliminate the flux leakage in the rotor, termed as (HTS-FSPM) machine has been proposed in this paper. Using genetic algorithm, the HTS and the conventional FSPM machines having the same size constraints and load conditions have been globally optimized for max. aveage torque. To highlight the advantages of the HTS-FSPM machine, a performance comparison between the conventional and HTS-FSPM machines has been presented. It is found that the HTS-FSPM machine can increase the torque by 27%, however, this comes with the expense of higher torque ripple and power losses. </p>
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Bunker, Bruce C., Dale L. Huber, James G. Kushmerick, Timothy Dunbar, Michael Kelly, Carolyn Matzke, Jianguo Cao, et al. "Switching Surface Chemistry with Supramolecular Machines†." Langmuir 23, no. 1 (January 2007): 31–34. http://dx.doi.org/10.1021/la0615793.

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Hwang, Young Jin, Jae Young Jang, and SangGap Lee. "A Flux-Controllable NI HTS Flux-Switching Machine for Electric Vehicle Applications." Applied Sciences 10, no. 5 (February 25, 2020): 1564. http://dx.doi.org/10.3390/app10051564.

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This paper deals with a flux-controllable NI HTS flux-switching machine (FSM) for electric vehicle (EV) applications. In a variable-speed rotating machine for EVs, such as electric buses, electric aircraft and electric ships, an electric motor capable of regulating the flux offers the advantage of constant output operation. In general, conventional HTS rotating machines have excellent flux-regulation performance, because they excite an HTS field coil. However, it is difficult to ensure any flux-regulation capabilities in HTS rotating machines using HTS field coils that apply the no-insulation (NI) winding technique, due to the inherent charge and discharge delays in these machines. Nevertheless, the NI winding technique is being actively researched as a key technology for the successful development of HTS rotating machines, because it can dramatically improve the operational stability of HTS field coils. Therefore, research to implement an HTS rotating machine with flux-regulation capabilities, while improving the operating stability of the HTS field coil using the NI winding technique, is required for EV applications. In this paper, we propose an HTS rotating machine with a flux switching structure, a type of topology of a rotating machine that is being actively studied for application to the electric motors used in EVs. The proposed HTS flux-switching machine (FSM) uses NI field coils, but additional field windings are applied for flux regulation, which enables flux control. In this study, an NI HTS field coil was also fabricated and tested because the characteristic resistance value should be used for the design and characteristic analyses of machines which utilize an NI coil. The simulation model used to analyze the flux-regulation performance capabilities of the NI HTS FSM were devised based on the characteristic resistance values obtained from a charging test of the fabricated NI HTS field coil. This study can provide a good reference for further research, including work on the manufacturing of a prototype NI HTS FSM for EV applications, and it can be used as a reference for the development of other HTS rotating machines, such as those used in large-scale wind power generation, where flux-regulation capabilities are required.
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Shaitor, Nikolay, Michal Kelemen, and Boris Yakimovich. "Analysis and Synthesis in the Design of Magnetic Switching Electric Machines." Actuators 10, no. 7 (July 16, 2021): 164. http://dx.doi.org/10.3390/act10070164.

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A systematic approach to the design of electrical machines is implemented by solving problems of analysis and synthesis in various combinations at different stages and stages of design. The questions of the formulation and implementation of synthesis and analysis problems in the study and design of modular-type magnetically commutated electrical machines are considered. They are aimed at reducing weight, size and cost while improving the performance of these newly designed machines. A complex method of parametric synthesis and an automated program containing a calculated mathematical model of an electric machine has been developed. On the basis of numerical full factorial experiments, the optimization parameter is determined, and a regression analysis is performed with the construction of an optimization model. It allows you to find a narrow range of variation of significant factors, at which the optimization parameter satisfies the specified conditions. On the example of studying an inductor generator of axial-radial configuration, new approaches to the formulation and solution of typical problems of analysis and synthesis of modular-type electrical machines are shown. The use of complex parametric synthesis makes it possible to significantly reduce the masses of the designed modular machines in comparison with drum-type inductor machines of the same power.
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Cao, Junshuai, Xinhua Guo, Weinong Fu, Rongkun Wang, Yulong Liu, and Liaoyuan Lin. "A Method to Improve Torque Density in a Flux-Switching Permanent Magnet Machine." Energies 13, no. 20 (October 13, 2020): 5308. http://dx.doi.org/10.3390/en13205308.

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With the continuous development of machines, various structures emerge endlessly. In this paper, a novel 6-stator-coils/17-rotor-teeth (6/17) E-shaped stator tooth flux switching permanent magnet (FSPM) machine is introduced, which has magnets added in the dummy slots of the stator teeth. This proposed machine is parametrically designed and then compared with the conventional 6/17 E-shaped stator tooth FSPM machine through finite element method (FEM) analysis. Then, combined with the results of FEM, the performance of two machines is evaluated, such as electromagnetic torque, efficiency, back electromotive force (back-EMF). The final results show that this novel 6/17 FSPM machine has greater output torque and smaller torque ripple.
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Pillai, S., and M. F. Jacome. "Predicated switching - optimizing speculation on EPIC machines." IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems 24, no. 3 (March 2005): 318–35. http://dx.doi.org/10.1109/tcad.2004.842804.

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Dissertations / Theses on the topic "Switching machines"

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Zulu, Ackim. "Flux switching machines using segmental rotors." Thesis, University of Newcastle Upon Tyne, 2010. http://hdl.handle.net/10443/1070.

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Flux switching machines (FSM) employing a segmental rotor have field and armature systems on the stator and a presentation of an unexcited rotor with isolated segments. The single-tooth winding arrangement on the stator provides a potential for material and energy savings. The principle for producing bipolar flux in the armature stator teeth relies on the natural switching of the armature tooth flux, accomplished by the moving segments of the rotor. Three phase configurations have been studied, from conception and design to construction and testing, with field excitation provided by either a field winding or permanent magnets (PM). Flux switching machines have shown characteristics that are peculiar when employing a segmental rotor, significantly affecting the symmetry of the induced armature EMF waveform and parity of magnitudes of the positive and negative torques. For three phase operation, six topologies are feasible when employing a 12-tooth stator and two other topologies may be produced on a 24-tooth stator. An optimum topology on the 12/8-configuration and another proof-of-principle topology on the 12/5-configuration, using field-windings and permanent-magnets, have been designed and constructed, while applying modern practices and considerations for manufacture. The characteristics of FSMs employing a segmental rotor, initially predicted by finiteelement (FE) modelling, have been verified by measurements. The FSM employing a field-winding is found to have a specific torque output which is similar to the conventional switched reluctance motor and still substantially higher than that of the synchronous reluctance motor. Although the PM adaptation of the FSM produces specific torque output which is nearly twice that of the wound-field FSM and about 64% that of an equivalent permanent-magnet synchronous motor (PMSM) with surface or insert magnets, accounting for the usage of the magnets reflects its specific torque output to be about 1.48 times higher than the PMSM. Although the FSM is operated as an AC machine with sinusoidal three-phase currents, its dq-equivalent representation shows significant differences from that of the conventional AC machine. In the prediction of the performance, it is found, in both the wound-field and PM configurations, that the dq model is more dependable if the coupling dq inductance is taken into account.
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Guardado, J. L. "Computer models for representing electrical machines during switching transients." Thesis, University of Manchester, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521481.

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Switching transients produce steep fronted waves (prestrikes or restrikes) which reach the machine terminals producing severe dielectric stresses in the winding insulation. The object of this study is to develop computer models for calculating the surge distribution in the winding during switching transients as well as to obtain a machine terminal representation. Beginning with a very simple model valid for very short periods of time, the computer models are extended and finally a full machine winding model is presented. The computer models developed cover a broad time and frequency range and they are based on multiconductor transmission line theory. Several phenomena like the flux penetration into the iron and the stator inter-coil coupling are studied and incorporated into the solutions. The thesis also describes several application studies using the computer models developed. The studies include a sensitivity analysis from which guidelines for reducing the dielectric stresses in the winding insulation are suggested. Using convolution techniques and measurements on machine terminals, a technique for a better assessment of the dielectric stresses in the coils during real switching transients is presented. Finally, the computer results are supported by a comprehensive set of measurements carried out on a 6.6 KV. 1690 KW. machine winding
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Icli, Burcak. "Towards Autonomous Molecular Machines: Switching Coupled To An Oscillating Reaction." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12608749/index.pdf.

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We have designed and synthesized a bistable pseudo-rotaxane carrying a fluorescent boradiazaindacene (BODIPY) unit. The intensity of the emission signal is dependent on the position of the cucurbituril (CB7) unit over the axle component. Thus, pH modulated switching of the CB7 wheel is accompanied by significant changes in the emission spectrum. Additionally, a thiosulfate-sulfite-iodate oscillating reaction which generates large amplitude pH oscillations can be carried out in the same solution. In such a solution, in response to changing pH, the position of the wheel component seems to change without outside intervention.
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Chen, Anyuan. "Investigation of Permanent Magnet Machines for Downhole Applications : _ Design, Prototype and Testing of a Flux-Switching Permanent Magnet Machine." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-11829.

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The current standard electrical downhole machine is the induction machine which is relatively inefficient. Permanent magnet (PM) machines, having higher efficiencies, higher torque densities and smaller volumes, have widely employed in industrial applications to replace conventional machines, but few have been developed for downhole applications due to the high ambient temperatures in deep wells and the low temperature stability of PM materials over time. Today, with the development of variable speed drives and the applications of high temperature magnet materials, it is increasingly interesting for oil and gas industries to develop PM machines for downhole applications. Recently, some PM machines applications have been presented for downhole applications, which are normally addressed on certain specific downhole case. In this thesis the focus has been put on the performance investigation of different PM machines for general downhole cases, in which the machine outer diameter is limited to be small by well size, while the machine axial length may be relatively long. The machine reliability is the most critical requirement while high torque density and high efficiency are also desirable. The purpose is to understand how the special constraints in downhole condition affect the performances of different machines.  First of all, three basic machine concepts, which are the radial, axial and transverse flux machines, are studied in details by analytical method. Their torque density, efficiency, power factor and power capability are investigated with respect to the machine axial length and pole number. The presented critical performance comparisons of the machines provide an indication of machines best suitable with respect to performance and size for downhole applications. Conventional radial flux permanent magnet (RFPM) machines with the PMs on the rotor can provide high torque density and high efficiency. This type of machine has been suggested for several different downhole applications. Flux-switching PM (FSPM) machines, which have the PMs located on the stator and are therefore more reliable, can theoretically also exhibit high torque density and relatively high efficiency. This thesis has put an emphasis on studying this type of machine. Two FSPM machines have been investigated in detail and compared by analytical method, FEM simulation and prototype measuremens. Their operating principle and important design parameters are also presented. A lumped parameter magnetic circuit model for designing a high-torque FSPM machine is newly introduced and the designed machine is verified by FEM simulations. A prototype machine with an outer diameter of 100 mm and an axial length of 200 mm is built in the laboratory and tested at room temperature. Based on that, the machine performance at an ambient temperature of 150°C is also predicted. The results show that the FSPM machine can provide a high torque density with slight compromise of efficiency and power factor. Choosing a proper machine type is significantly dependent on the application specifications. The presented results in this thesis can be used as a reference for selecting the best machine type for a specific downhole case.
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Forster, Andrew E. "Energy Harvesting From Exercise Machines: Buck-Boost Converter Design." DigitalCommons@CalPoly, 2017. https://digitalcommons.calpoly.edu/theses/1702.

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This report details the design and implementation of a switching DC-DC converter for use in the Energy Harvesting From Exercise Machines (EHFEM) project. It uses a four-switch, buck-boost topology to regulate the wide, 5-60 V output of an elliptical machine to 36 V, suitable as input for a microinverter to reclaim the energy for the electrical grid. Successful implementation reduces heat emissions from electrical energy originally wasted as heat, and facilitates a financial and environmental benefit from reduced net energy consumption.
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Nasr, Andre. "Nouvelles structures de machines électriques pour la génération embarquée avionique." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLN065.

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Les travaux présentés dans cette thèse abordent le sujet de la génération électrique embarquée dans les avions de futur. L'objectif principal étant de trouver de nouvelles structures de machines électriques qui peuvent répondre aux nouvelles exigences avioniques. Nous nous sommes particulièrement intéressés à une Machine à Commutation de Flux à Double Excitation avec Pont Magnétique (MCFDEPM). La structure de cette machine présente plusieurs avantages comme des sources d'excitation statiques, un rotor passif et une structure particulière du stator qui permet d'avoir une faible tension rémanente respectant ainsi les contraintes de sécurité du cahier des charges. Dans le premier chapitre, nous avons présenté un état de l'art sur les machines à commutation de flux à simple et à double excitation. Nous avons donné aussi les règles qui définissent le choix du nombre de pôles statoriques et rotoriques. Le chapitre 2 a été consacré pour étudier les performances électromagnétiques de la MCFDEPM en utilisant un modèle en éléments finis. Ce modèle a été validé par des mesures expérimentales réalisées sur un prototype 3 kW. Dans un dernier chapitre, nous avons mis en place une méthodologie d'optimisation en éléments finis pour améliorer les performances en charge de la MCFDEPM et limiter sa tension rémanente. Les résultats de l'optimisation ont montré des performances bien améliorées. La MCFDEPM se présente comme une bonne candidate pour remplacer la machine à 3 étages dans l'avion du futur
This work addresses the subject of the embedded electric generation in future aircraft. The main objective is to find a new electrical machine structures that can meet the new avionic requirements. We have been particularly interested in a Hybrid Excited Flux Switching machine with a Magnetic Bridge (HEFSMMB). The structure of this machine has several advantages such as static excitation sources, a passive rotor and a unique stator structure which makes it possible to have a low residual voltage, thus respecting the safety constraints. We have presented in the first chapter a state of the art on singly and doubly excited flux switching machines. We have also given the rules which define the choice of the number of stator and rotor poles. Chapter 2 was devoted to study the electromagnetic performances of the HEFSMMB using a finite element model. This model has been validated by experimental measurements carried out on a 3 kW prototype. In the final chapter, we have put in place an optimization methodology in order to improve the overall performances of the HEFSMMB and to limit its residual voltage. The optimization results showed much improved performances. It can be concluded that the MCFDEPM is a good candidate to replace the three-stage machine in future aircraft
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Felicetti, Roberto. "Voltage Transients in the Field Winding of Salient Pole Wound Synchronous Machines : Implications from fast switching power electronics." Licentiate thesis, Uppsala universitet, Elektricitetslära, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-434652.

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Wound Field Synchronous Generators provide more than 95% of the electricity need worldwide. Their primacy in electricity production is due to ease of voltage regulation, performed by simply adjusting the direct current intensity in their rotor winding. Nevertheless, the rapid progress of power electronics devices enables new possibilities for alternating current add-ins in a more than a century long DC dominated technology. Damping the rotor oscillations with less energy loss than before, reducing the wear of the bearings by actively compensating for the mechanic unbalance of the rotating parts, speeding up the generator with no need for additional means, these are just few of the new applications which imply partial or total alternated current supplying of the rotor winding. This thesis explores what happens in a winding traditionally designed for the direct current supply when an alternated current is injected into it by an inverter. The research focuses on wound field salient pole synchronous machines and investigates the changes in the field winding parameters under AC conditions. Particular attention is dedicated to the potentially harmful voltage surges and voltage gradients triggered by voltage-edges with large slew rate. For this study a wide frequency band simplified electromagnetic model of the field winding has been carried out, experimentally determined and validated. Within the specific application of the fast field current control, the research provides some references for the design of the rotor magnetic circuit and of the field winding. Finally the coordination between the power electronics and the field winding properties is addressed, when the current control is done by means of a long cable or busbars, in order to prevent or reduce the ringing.
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Calmels, Dorothea [Verfasser], and Hans [Akademischer Betreuer] Ziegler. "Job Sequencing and Tool Switching Problems with a Generalisation to Non-Identical Parallel Machines / Dorothea Calmels ; Betreuer: Hans Ziegler." Passau : Universität Passau, 2020. http://d-nb.info/1218780703/34.

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Lovgren, Nicholas Keith. "Energy Harvesting From Exercise Machines: Forward Converters with a Central Inverter." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/520.

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This thesis presents an active clamp forward converter for use in the Energy Harvesting From Exercise Machines project. Ideally, this converter will find use as the centerpiece in a process that links elliptical trainers to the California grid. This active clamp forward converter boasts a 14V-60V input voltage range and 150W power rating, which closely match the output voltage and power levels from the elliptical trainer. The isolated topology outputs 51V, higher than previous, non-isolated attempts, which allows the elliptical trainers to interact with a central grid-tied inverter instead of many small ones. The final converter operated at greater than 86% efficiency over most of the elliptical trainer’s input range, and produced very little noise, making it a solid choice for this implementation.
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Ben, Sedrine Emna. "Machines à commutation de flux à grand nombre de phases : modèles comportementaux en mode dégradé et élaboration d’une stratégie de commande en vue de l’amélioration de la tolérance aux pannes." Thesis, Cachan, Ecole normale supérieure, 2014. http://www.theses.fr/2014DENS0047/document.

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Dans cette thèse, nous nous sommes intéressés à l'étude des modèles comportementaux en mode dégradé des machines pentaphasées à commutation de flux (MCF pentaphasée). Tout d'abord, une comparaison des performances électromagnétiques de cette machine à une machine triphasée équivalente est tout d'abord effectuée. Ces performances sont calculées par la méthode des Eléments Finis (EF 2D) et validées expérimentalement. Les résultats ont montré l'apport de la machine pentaphasée avec un couple massique plus élevé, une ondulation de couple plus faible, un courant de court-circuit plus faible et sa capacité à tolérer des défauts de phases. L'étude de la tolérance aux ouvertures de phases est alors élaborée pour cette MCF pentaphasée. Le comportement de la machine en cas d'ouvertures de phases (du point de vue du couple moyen, de l'ondulation de couple, des pertes Joule et du courant dans le neutre) est présenté. Ensuite, des méthodes de reconfiguration en vue d'améliorer le fonctionnement sont proposées dont une reconfiguration minimale permettant de se retrouver avec une alimentation équivalente à celle d'une machine tétraphasée ou triphasée, un calcul analytique des courants optimaux permettant d'annuler à la fois le courant du neutre et l'ondulation du couple tout en assurant le couple moyen, et finalement une reconfiguration assurée par un algorithme génétique d'optimisation qui est un algorithme non-déterministe multi-objectifs et multi-contraintes. Diverses combinaisons des différents objectifs et contraintes sont, dans ce cadre, effectuées et les courants optimaux sont injectés dans le modèle EF 2D de la machine pour vérifier si les performances ont été améliorées. Le modèle analytique du couple pris en compte dans l'algorithme d'optimisation est alors révisé pour prendre en compte l'influence du mode dégradé. Les différentes solutions du front de Pareto sont analysées et les performances électromagnétiques sont bien améliorées. Cela est vérifié par les calculs EF 2D et suivi d'une validation expérimentale. L'influence des défauts sur les forces magnétiques radiales est également analysée. Dans une seconde partie, l'étude de la tolérance de la machine pentaphasée à commutation de flux aux défauts de courts-circuits est effectuée. Les premières étapes d'isolation des défauts de courts-circuits sont proposées. Par la suite, les courants de courts-circuits, prenant en compte l'effet reluctant de la machine, sont calculés analytiquement et leurs effets sur les performances de la machine sont analysés. Les reconfigurations sont aussi calculées par l'algorithme génétique d'optimisation et les nouvelles références des courants permettent d'améliorer le fonctionnement en mode dégradé. Tous les résultats sont validés par la méthode des EF 2D et expérimentalement. En conclusion, des comparaisons entre la tolérance aux défauts d'ouvertures et de courts-circuits de la machine pentaphasée à commutation de flux sont effectuées et ont permis de conclure quant au fonctionnement de cette machine en modes sain et dégradé avec et sans correction. Les résultats analytiques, numériques et expérimentaux ont montré la bonne efficacité de la commande proposée pour l'amélioration de la tolérance aux défauts d'ouvertures et courts-circuits de phases
In this thesis, we are interested in the study of a five-phase flux switching permanent magnet machine (five-phase FSPM machine) behavior in healthy and faulty mode. First, a comparison of electromagnetic performances between this machine and an equivalent three-phase machine is carried out. These performances are calculated by a Finite Element (FE 2D) model and validated by experiments. Results showed the five-phase machine contribution with a higher torque density, lower torque ripples, lower short-circuit current and ability to tolerate phases faults. The study of open-circuit tolerance is then developed for this five-phase FSPM. The behavior of the machine (the average torque, torque ripples, copper losses and the current in the neutral) in the case of open-circuit on a single and two adjacent and non-adjacent phases is presented. Then reconfiguration methods to improve the operation are proposed including a minimum reconfiguration allowing to end up with a feeding equivalent to that of a three-phase or a four-phase machine, an analytical calculation of optimal currents to cancel both the neutral current and torque ripples while ensuring the average torque, and finally a reconfiguration performed by a genetic optimization algorithm which is a non-deterministic algorithm multi-objective functions and multi-constraints. In this context, various combinations of different objectives and constraints are proposed and optimal currents are injected into the 2D FE model of the machine to see if performances have been improved. The analytical model of the torque used in the optimization algorithm is then revised to take into account the influence of the degraded mode. Different solutions of Pareto front are analyzed and electromagnetic performances are improved. This is verified by FE 2D calculations and followed by experimental validation. Faults impact on the radial magnetic forces is also analyzed. In the second part of this work, the study of the five-phase FSPM machine tolerance to short-circuit faults is performed. First steps of the faults isolation are proposed. Thereafter, short-circuit currents, taking into account the reluctance machine impact, are calculated analytically and their effects on machine performances are analyzed. Reconfigurations are also calculated by the genetic algorithm optimization and new references currents improved the degraded mode operation. All results are validated by the FE 2D calculation and experimentally. In conclusion, comparisons between fault-tolerance to phases openings and short-circuits of the five-phase FSPM machine are performed. Results led to conclude regarding the operation of this machine in healthy and degraded modes with and without correction. Analytical, numerical and experimental results showed good efficiency of the proposed control to improve fault-tolerance to phases openings and short-circuits
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Books on the topic "Switching machines"

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Benzaouia, Abdellah. Saturated Switching Systems. London: Springer London, 2012.

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K, Jha Niraj, ed. Switching and finite automata theory. 3rd ed. Cambridge, UK: Cambridge University Press, 2010.

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Kohavi, Zvi. Switching and finite automata theory. 3rd ed. New York: Cambridge University Press, 2009.

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Sasao, Tsutomu. Switching theory for logic synthesis. Boston, Mass: Kluwer Academic Publishers, 1999.

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Sasao, Tsutomu. Switching theory for logic synthesis. Boston, Mass: Kluwer Academic Publishers, 1999.

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Digital logic and state machine design. 3rd ed. Ft. Worth: Saunders College Pub., 1995.

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Digital logic and state machine design. 2nd ed. Philadelphia: Saunders College Pub., 1990.

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Comer, David J. Digital logic and state machine design. 3rd ed. New York: Oxford University Press, 1995.

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Comer, David J. Digital logic and state machine design. 2nd ed. Philadelphia, Pa: Saunders College Pub, 1990.

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Savage, John E. The complexity of computing. Malabar, Fla: R.E. Krieger Pub. Co., 1987.

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Book chapters on the topic "Switching machines"

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Sofianos, Nikolaos A., and Yiannis S. Boutalis. "Advances in Multiple Models Based Adaptive Switching Control: From Conventional to Intelligent Approaches." In Innovations in Intelligent Machines-5, 73–108. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-43370-6_3.

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Weisheit, Toni, and Robert Hoyer. "Prediction of Switching Times of Traffic Actuated Signal Controls Using Support Vector Machines." In Advanced Microsystems for Automotive Applications 2014, 121–29. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-08087-1_12.

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Ravi, Arpitha, Florian Kordon, and Andreas Maier. "Automatic Switching of Organ Programs in Interventional X-ray Machines Using Deep Learning." In Informatik aktuell, 95–100. Wiesbaden: Springer Fachmedien Wiesbaden, 2022. http://dx.doi.org/10.1007/978-3-658-36932-3_20.

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Calmels, Dorothea, Chandrasekharan Rajendran, and Hans Ziegler. "Heuristics for Solving the Job Sequencing and Tool Switching Problem with Non-identical Parallel Machines." In Operations Research Proceedings, 459–65. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-18500-8_57.

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Albers, Susanne, and Jens Quedenfeld. "Algorithms for Energy Conservation in Heterogeneous Data Centers." In Lecture Notes in Computer Science, 75–89. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75242-2_5.

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AbstractPower consumption is the major cost factor in data centers. It can be reduced by dynamically right-sizing the data center according to the currently arriving jobs. If there is a long period with low load, servers can be powered down to save energy. For identical machines, the problem has already been solved optimally by [25] and [1].In this paper, we study how a data-center with heterogeneous servers can dynamically be right-sized to minimize the energy consumption. There are d different server types with various operating and switching costs. We present a deterministic online algorithm that achieves a competitive ratio of 2d as well as a randomized version that is 1.58d-competitive. Furthermore, we show that there is no deterministic online algorithm that attains a competitive ratio smaller than 2d. Hence our deterministic algorithm is optimal. In contrast to related problems like convex body chasing and convex function chasing [17, 30], we investigate the discrete setting where the number of active servers must be an integral, so we gain truly feasible solutions.
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Geurts, Pierre, and Louis Wehenkel. "Temporal Machine Learning for Switching Control." In Principles of Data Mining and Knowledge Discovery, 401–8. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/3-540-45372-5_43.

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Pedretti, Giacomo, and Daniele Ielmini. "Analogue In-Memory Computing with Resistive Switching Memories." In Machine Learning and Non-volatile Memories, 61–86. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-03841-9_4.

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Chen, Kean, Danpu Liu, and Xingwen He. "Fast Beam Switching Based on Machine Learning for MmWave Massive MIMO Systems." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 19–29. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-90196-7_2.

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Li, Yinan, and Fang Liu. "Continuous-Time Markov-Switching GARCH Process with Robust State Path Identification and Volatility Estimation." In Machine Learning and Knowledge Discovery in Databases. Research Track, 370–87. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-86486-6_23.

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Cong, Wei, Feng Zhao, Yongxing Wang, and Xuhui Wen. "Detailed Optimization for Different Switching Angle Curves of SHEPWM Adopted by Induction Machine Control System." In Proceedings of the 2015 International Conference on Electrical and Information Technologies for Rail Transportation, 647–57. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49367-0_63.

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Conference papers on the topic "Switching machines"

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"Flux-switching machines and drives." In 2016 XXII International Conference on Electrical Machines (ICEM). IEEE, 2016. http://dx.doi.org/10.1109/icelmach.2016.7732855.

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Ilhan, E., T. L. Balyovski, J. J. H. Paulides, and E. A. Lomonova. "Servo flux switching PM machines." In 2014 XXI International Conference on Electrical Machines (ICEM). IEEE, 2014. http://dx.doi.org/10.1109/icelmach.2014.6960247.

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Roemer, Daniel B., Per Johansen, Henrik C. Pedersen, and Torben O. Andersen. "Design Method for Fast Switching Seat Valves for Digital Displacement® Machines." In 8th FPNI Ph.D Symposium on Fluid Power. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fpni2014-7852.

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Digital Displacement® (DD) machines are upcoming technology where the displacement of each pressure chamber is controlled electronically by use of two fast switching seat valves. The effective displacement and operation type (pumping/motoring) may be controlled by manipulating the seat valves corresponding to the piston movement, which has been shown to facilitate superior part load efficiency combined with high bandwidth compared to traditional displacement machines. However, DD machines need fast switching on-off valves with low pressure loss for efficient operation, especially in fast rotating operation, where switching times must be performed within a few milliseconds. These valve requirements make a simulation based design approach essential, where mechanical strength, thermal dissipation, fluid dynamics and electro-magnetic dynamics must be taken into account. In this paper a complete design method for DD seat valves are presented, taking into account the significant aspects related to obtaining efficient DD valves with basis in a given DD machine specifications. The seat area is minimized and the stroke length is minimized to obtain fast switching times while considering the pressure loss of the valves. A coupled optimization is finally conducted to optimize the electro-magnetic actuator, leading to a valve design based on the chosen valve topology. The design method is applied to an example DD machine and the resulting valve design fulfilling the requirements is presented.
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Lee, Il-Ho, Jun-Gu Kim, Jae-Hyung Kim, Chung-Yuen Won, and Yong-Chae Jung. "Soft switching bidirectional DC-DC converter to reduce switching losses." In 2011 International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2011. http://dx.doi.org/10.1109/icems.2011.6073568.

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Chen, J. T., Z. Q. Zhu, S. Iwasaki, and R. Deodhar. "Low cost flux-switching brushless AC machines." In 2010 IEEE Vehicle Power and Propulsion Conference (VPPC). IEEE, 2010. http://dx.doi.org/10.1109/vppc.2010.5728984.

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Zhao, Guishu, Wei Hua, and Ji Qi. "Comparative study of wound-field flux-switching machines and switched reluctance machines." In 2017 20th International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2017. http://dx.doi.org/10.1109/icems.2017.8056182.

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Wong, W. S. H. "Constant inverter switching frequency direct torque control." In International Conference on Power Electronics Machines and Drives. IEE, 2002. http://dx.doi.org/10.1049/cp:20020097.

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Liu, Xiao, Aaron M. Cramer, Vandana Rallabandi, and Dan M. Ionel. "Switching frequency selection for ultra-low-inductance machines." In 2017 IEEE International Electric Machines and Drives Conference (IEMDC). IEEE, 2017. http://dx.doi.org/10.1109/iemdc.2017.8002403.

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Ilhan, E., M. F. J. Kremers, T. E. Motoasca, J. J. H. Paulides, and E. Lomonova. "Transient thermal analysis of flux switching PM machines." In 2013 Eighth International Conference and Exhibition on Ecological Vehicles and Renewable Energies (EVER 2013). IEEE, 2013. http://dx.doi.org/10.1109/ever.2013.6521588.

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Khan, Faisal, Erwan Sulaiman, Mohd Fairoz Omar, and Mahyuzie Jenal. "Performance comparison of wound field flux switching machines." In 2015 IEEE Conference on Energy Conversion (CENCON). IEEE, 2015. http://dx.doi.org/10.1109/cencon.2015.7409560.

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