Relevant bibliographies by topics / Electric machinery - Excitation systems

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Electric machinery - Excitation systems'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Electric machinery - Excitation systems"

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Wardach, Marcin, Ryszard Palka, Piotr Paplicki, Pawel Prajzendanc, and Tomasz Zarebski. "Modern Hybrid Excited Electric Machines." Energies 13, no. 22 (November 12, 2020): 5910. http://dx.doi.org/10.3390/en13225910.

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The paper deals with the overview of different designs of hybrid excited electrical machines, i.e., those with conventional permanent magnets excitation and additional DC-powered electromagnetic systems in the excitation circuit. The paper presents the most common topologies for this type of machines found in the literature—they were divided according to their electrical, mechanical and thermal properties. Against this background, the designs of hybrid excited machines that were the subject of scientific research of the authors are presented.
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Ecker, Horst, and Thomas Pumhössel. "Vibration suppression and energy transfer by parametric excitation in drive systems." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 8 (May 17, 2012): 2000–2014. http://dx.doi.org/10.1177/0954406212447485.

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Drive systems may experience torsional vibrations due to various kinds of excitation mechanisms. In many engineering systems, however, such vibrations may have a negative impact on the performance and must be avoided or reduced to an acceptable level by all means. Self-excited vibrations are especially unwanted, since they may grow rapidly and not only degrade the performance but even damage machinery. In this contribution it is suggested to employ parametric stiffness excitation to suppress self-excited vibrations. In the first part of the article we study the basic energy transfer mechanism that is initiated by parametric excitation, and some general conclusions are drawn. In the second part, a hypothetic drivetrain, consisting of an electrical motor, a drive shaft and working rolls is investigated. A self-excitation mechanism is assumed to destabilize the drive system. Parametric excitation is introduced via the speed control of the electrical drive, and the capability of stabilizing the system by this measure is investigated. It is shown that the damping available in the system can be used much more effectively if parametric stiffness excitation is employed.
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Ali, Hassan, Erwan Sulaiman, Mahyuzie Jenal, Irfan Ali, Laili Iwani Jusoh, Zarafi Ahmad, and Mohd Firdaus. "Design and analysis of double stator HE-FSM for aircraft applications." International Journal of Power Electronics and Drive Systems (IJPEDS) 12, no. 1 (March 1, 2021): 51. http://dx.doi.org/10.11591/ijpeds.v12.i1.pp51-58.

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The main objective of aerospace industry is to produce all electric aircraft (AEA) equipped by electrical devices in coming developments. Electrical machines that provide higher torque densities are gaining more interest for researchers to obtain sustainable direct-drive electrical propulsion system for aircraft applications. In addition to lesser weight and higher torque density, a machine should be “fault tolerant” to applied in aerospace applications. A novel machine for high starting torque, identified as flux switching machine (FSM) was established over the last decade. FSMs comprise all effective sources on stator including robust rotor structure. These machines exhibited higher “torque-to-weight ratios” and reliability. Nonetheless, the challenge of developing a machine suitable for aircraft applications goes far beyond electromagnetic design and much deeper into the field of mechanical systems than traditional ones. Thus, a new double stator (DS) hybrid excitation (HE) FSM design employing segmented rotor is proposed and analyzed in this research work. The suggested design for DS HE-FSM comprises of six field excitation coils (FECs) and six permanent magnets (PMs) as their excitation sources. In this research, investigation of DS HE-FSM is accomplished with respect to flux linkage, back EMF, cogging torque and torque analysis based on 2D FEA.
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Deaconu, Sorin Ioan, Marcel Topor, Gabriel Nicolae Popa, and Feifei Bu. "Hybrid Electric Vehicle with Matrix Converter and Direct Torque Control in Powertrains Asynchronous Motor Drives." MATEC Web of Conferences 292 (2019): 01066. http://dx.doi.org/10.1051/matecconf/201929201066.

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Electric transportation has made rapid developments and significant steps toward the full electrical powertrain systems. With the increased use of electric vehicles energy conversion systems several technologies have been developed and reached a high degree of performance. Since electric vehicles and hybrid are the more cost competitive technology available today, the evolution toward a more reliable powertrain combining different electric powertrain systems is needed. Induction machine and permanent magnet generators/motors integrated powertrains have some significant advantages over other types of systems such as no need of excitation, low volume and weight, high precision, and no use of a complex gearbox for torque/speed conversion. A electric vehicle powertrain for EV propulsion with a induction motor and a matrix converter is proposed in this paper. The induction motor is controlled using the direct torque flux algorithm. The traditional power conversion stages consist of a rectifier followed by an inverter and bulky DC link capacitor. It involves 2 stages of power conversion and, subsequently, the efficiency of the overall EV is reduced because of power quality issues mainly based on total harmonic distortion. The proposed solution incorporates a matrix converter is mainly utilized to control the induction electric motor for propulsion. The matrix converter is a simple and compact direct AC-AC converter. The proposed EV with matrix converter is modeled using PSIM.
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Barskov, V. V., A. V. Bubnov, and A. N. Kirichenko. "Features of practical application of electric power system’s stability estimation methods." Omsk Scientific Bulletin, no. 174 (2020): 46–51. http://dx.doi.org/10.25206/1813-8225-2020-174-46-51.

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Timeliness of the topic is conditioned by the need to keep up ample of static and transient stability margins in modern electrical power systems. The article object is to give a determination of present methods of evaluating damping of systems with synchronous machines, in the context of their effectiveness. And also to estimate the effectiveness of these methods in the performance of the task concerned with selecting best settings of automatic excitation regulators of synchronous generators. This analysis led us to the conclusions, in particular, about possibility to apply the root locus methods in estimating stability of electrical power systems, and also about genericity of the matrix method with the use of QR-algorithm, which is widely used in practice of calculating stability
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Safaryan, V. S. "STUDY OF TRANSIENT AND STATIONARY OPERATION MODES OF SYNCHRONOUS SYSTEM CONSISTING IN TWO MACHINES." ENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations 60, no. 3 (May 17, 2017): 228–36. http://dx.doi.org/10.21122/1029-7448-2017-60-3-228-236.

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The solution of the problem of reliable functioning of an electric power system (EPS) in steady-state and transient regimes, prevention of EPS transition into asynchronous regime, maintenance and restoration of stability of post-emergency processes is based on formation and realization of mathematical models of an EPS processes. During the functioning of electric power system in asynchronous regime, besides the main frequencies, the currents and voltages include harmonic components, the frequencies of which are multiple of the difference of main frequencies. At the two-frequency asynchronous regime the electric power system is being made equivalent in a form of a two-machine system, functioning for a generalized load. In the article mathematical models of transient process of a two-machine system in natural form and in d–q coordinate system are presented. The mathematical model of two-machine system is considered in case of two windings of excitement at the rotors. Also, in the article varieties of mathematical models of EPS transient regimes (trivial, simple, complete) are presented. Transient process of a synchronous two-machine system is described by the complete model. The quality of transient processes of a synchronous machine depends on the number of rotor excitation windings. When there are two excitation windings on the rotor (dual system of excitation), the mathematical model of electromagnetic transient processes of a synchronous machine is represented in a complex form, i.e. in coordinate system d, q, the current of rotor being represented by a generalized vector. In asynchronous operation of a synchronous two-machine system with two excitation windings on the rotor the current and voltage systems include only harmonics of two frequencies. The mathematical model of synchronous steady-state process of a two-machine system is also provided, and the steady-state regimes with different structures of initial information are considered.
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BULATOV, Yury N., Andrey V. KRYUKOV, and Edward K. SHUMANSKY. "Application of Asynchronized Generators in Electric Networks with Degraded Electric Power Quality." Elektrichestvo 7, no. 7 (2021): 33–40. http://dx.doi.org/10.24160/0013-5380-2021-7-33-40.

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For decentralized power generation, small-capacity asynchronized generators (AGs) can be used, which are able to yield a number of positive effects in comparison with conventional synchronous machines: higher stability limits, wider reactive power adjustment ranges, simpler synchronization with the grid due to the ability to control the EMF phase, and the possibility to maintain synchronous operation in case of failure in one of the field windings. The article describes the model of a grid equipped with asynchronized generators with automatic excitation and rotor speed control systems, which is developed in the MATLAB software package environment. Normal and emergency operation modes of a 35 kV grid with distributed generation plants based on asynchronized machines under the conditions of degraded electric power quality due to the presence of electric traction loads are simulated. The influence of AGs on emergency and post-emergency modes are determined, and the harmonic distortion levels are estimated. For comparison, the grid operation modes are simulated for the case of using synchronous machines as generation sources. The influence of higher harmonic components on the performance of the proposed automatic control system is analyzed. The obtained study results have shown that with using asynchronized generators, better control processes and better quality of electric power are obtained in comparison with those in a grid equipped with synchronous machines; in addition, the stability limits are increased, and the synchronization processes are simplified.
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Płaczek, Marek, and Grzegorz Kokot. "Modelling and Laboratory Tests of the Temperature Influence on the Efficiency of the Energy Harvesting System Based on MFC Piezoelectric Transducers." Sensors 19, no. 7 (March 31, 2019): 1558. http://dx.doi.org/10.3390/s19071558.

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Macro Fibre Composites (MFC) are very effective piezoelectric transducers that, among others, can be used as elements of energy harvesting systems. The possibility to generate electric energy, for example, from mechanical vibrations in order to power electrical elements that could not be powered in another way (using wires or batteries) is a great solution. However, such a kind of systems has to be designed by considering all phenomena that could occur during the exploitation of the system. One of those phenomena is the temperature fluctuation during the device operation. In the presented research work, a mathematical model of the energy harvesting system based on MFC transducers is proposed. The mathematical model was validated by laboratory tests conducted on a laboratory stand equipped with a universal mechanical testing machine (Instron Electropuls 10000) and a thermal chamber. During the tests, the samples were subjected to cyclic excitation simulating the operation of the system in various environmental conditions by forcing changes in the system operation temperature with the constant conditions of its excitation.
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Manuaba, Ida Bagus Gede, Putu Arya Mertasana, Made Mataram, and Cok Gede Indra Partha. "Improving Performance Stability of Power System Java-Bali Interconnection with PIDPSS3B and PIDSVC Controllers." Journal of Electrical, Electronics and Informatics 1, no. 1 (February 3, 2017): 17. http://dx.doi.org/10.24843/jeei.2017.v01.i01.p04.

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Modern electric power system that many its dynamic equipment continuously vulnerable to internal and external disturbances. On the condition of the disorder, it often happen oscillation in each part or between parts of the electrical system is interconnected. These oscillations become a major problem for the stability of the power system. Modern electrical control systems require a sustainable balance between power generation and demand varying loads. Power System Stabilizer and Static Var Compensator is a control device that is used to dampen low frequency oscillations and to provide additional feedback signal to stabilize the system. To increase the damping, system equipped with PSS generator that provides additional feedback to stabilize the signal in the excitation system. It is generally that the machine parameters changed by the load, so the dynamic behavior of the different machines at different operating conditions. Design PIDPSS3B power system stabilizer and PIDSVC controller used aim to get performance and optimum damping. Design and optimization of the proposed has the ability to optimally dampen and suppress errors are minimal.
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Romanov, Roman A., Tatyana V. Myasnikova, and Alexey N. Matyunin. "INCREASE IN THE ELECTROMAGNETIC MOMENT OF A SUPERMINIATURE ELECTRIC MOTOR EXCITED BY RARE EARTH PERMANENT MAGNETS." Vestnik Chuvashskogo universiteta, no. 1 (March 25, 2021): 111–21. http://dx.doi.org/10.47026/1810-1909-2021-1-111-121.

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The article is devoted to improving the energy and performance characteristics of superminiature electric motors, which are widely used in modern devices of robotics and mechanotronics. With the development of digital and Autonomous robotic systems, the tasks of improving the efficiency of Executive micromechanisms that affect the functionality and duration of work in offline mode have become particularly relevant. Traditional design and technological solutions used in higher-power electric machines are not scalable to the field of superminiature electric machines. Domestic and foreign developers offer various design options and manufacturing technologies. The key design feature of the electric motor under consideration is a glass stator made by polycapillary fiber technology and an excitation system from rare-earth permanent magnets. In the wall of the glass case, holes are evenly distributed around the circumference, in which the control winding is laid. The motor excitation system is a two-pole permanent magnet located on the rotating rotor shaft. The purpose of the research is to determine the effect of changing the design of the excitation system by changing the location of the magnetic poles. The research uses software that simulates the electromagnetic field using the finite element method. In the course of research, it was found that a decrease in the body of a permanent magnet leads to a decrease in the electromagnetic moment, which is not compensated by a decrease in edge effects at the boundary of the poles of the magnet. However, an increase in the value of the maximum magnetic induction in the air gap allows us to conclude that edge effects at the pole boundary have a significant effect on reducing the energy characteristics of superminiature micromachines. Thus, the solutions proposed in this paper are not sufficient to increase the efficiency of the engine, but the data obtained indicate the need to reduce the edge effects of permanent magnets.
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Dissertations / Theses on the topic "Electric machinery - Excitation systems"

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Lee, Yongsik. "A study of parametric excitation applied to a MEMS tuning fork gyroscoe." Diss., Columbia, Mo. : University of Missouri-Columbia, 2007. http://hdl.handle.net/10355/4697.

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Thesis (Ph. D.)--University of Missouri-Columbia, 2007.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on November 29, 2007 Vita. Includes bibliographical references.
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Neal, Harold Lewis. "Response of a parametrically-excited system to a nonstationary excitation." Thesis, Virginia Tech, 1992. http://hdl.handle.net/10919/42617.

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Reeves, Kevin. "Dynamic-systems analysis of self-excitation associated with a capacitor-coupled substation (CCS) - induction machine system." Master's thesis, University of Cape Town, 2006. http://hdl.handle.net/11427/5116.

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Includes bibliographical references.
The purpose of this thesis is therefore to establish the cause of SSR at the Meru-Petronet system, and other similar systems, and investigate various compensation techniques.
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Liu, Guoping. "Oscillation monitoring system based on wide area phasor measurements in power systems." Pullman, Wash. : Washington State University, 2010. http://www.dissertations.wsu.edu/Dissertations/Summer2010/g_liu_060110.pdf.

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Thesis (Ph. D.)--Washington State University, August 2010.
Title from PDF title page (viewed on July 23, 2010). "School of Electrical Engineering and Computer Science." Includes bibliographical references (p. 76-81).
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O'Leary, Beth Andrews. "Analysis of high-speed rotating systems using Timoshenko beam theory in conjunction with the transfer matrix method /." Online version of thesis, 1989. http://hdl.handle.net/1850/10608.

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Miri, Seyed-Mehdi. "Modeling and fault detection in electromagnetic devices : applications to synchronous machines and signal conditioning systems /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487332636476273.

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Qunais, Thaer. "Parametric Average-Value Model of Rectifiers in Brushless Excitation Systems." UKnowledge, 2013. http://uknowledge.uky.edu/ece_etds/37.

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An average-value model of a rotating rectifier circuit in a brushless excitation system is set forth, where a detailed simulation is required to extract the essential averaged-model parameters using numerical averaging. In the proposed approach, a synchronous machine model with saturation and cross saturation and an arbitrary rotor network representation that uses a voltage-behind-reactance representation for the field winding of the main machine is proposed. This allows the field winding to be represented as branches in a circuit solver, permitting straightforward simulation with connected circuitry. Also a brushless exciter model is introduced to be compatible with the averaged-model, where the exciter armature windings are represented using a voltage-behind-reactance formulation. The resulting average-value model is verified in time domain against detailed simulation, and its validity is demonstrated in all rectifier modes of operation.
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Cheung, Siu-pan. "Direct transient stability margin assessment of power system with excitation control and SVC control /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1753706X.

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Lee, Seungkoo. "An architecture for a diagnostic/prognostic system with rough set feature selection and diagnostic decision fusion capabilities." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/14715.

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張小彬 and Siu-pan Cheung. "Direct transient stability margin assessment of power system with excitation control and SVC control." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31212979.

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Books on the topic "Electric machinery - Excitation systems"

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I, Loginov S., ed. Nauchnye osnovy proektirovanii͡a︡ sistem vozbuzhdenii͡a︡ moshchnykh sinkhronnykh mashin. Leningrad: "Nauka," Leningradskoe otd-nie, 1988.

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Girgis, George K. Hungry Horse Unit 4 excitation system commissioning test. Denver, Colo: U.S. Bureau of Reclamation, 1992.

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Smirnov, Aleksandr. Electric drive with contactless synchronous motors. ru: INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/1192105.

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Contactless synchronous machines are considered, classification, description of structures, construction of analytical and numerical models for research calculations and design of inductor motors with electromagnetic excitation and with excitation from permanent magnets are given. Examples of design and research calculations of the operation of a synchronous drive of automation systems by means of a computational experiment are given.
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Nasar, S. A. Electric energy systems. Upper Saddle River, N.J: Prentice Hall, 1996.

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Krause, Paul C. Analysis of electric machinery and drive systems. Hoboken, New Jersey: Wiley, 2013.

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Krause, Paul C. Analysis of electric machinery and drive systems. 2nd ed. New York: IEEE Press, 2002.

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Electric machines and power systems. New York: McGraw-Hill, 1995.

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Electric machines and power systems. New York: McGraw-Hill, 1995.

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Williamson, A. C. Introduction to electrical energy systems. Harlow, Essex, England: Longman Scientific & Technical, 1988.

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Electric machinery and power system fundamentals. Boston: McGraw-Hill, 2002.

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Book chapters on the topic "Electric machinery - Excitation systems"

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Topenot, Margaux, Gaël Chevallier, Morvan Ouisse, and Damien Vaillant. "Model Reduction of Electric Rotors Subjected to PWM Excitation for Structural Dynamics Design." In Rotating Machinery, Optical Methods & Scanning LDV Methods, Volume 6, 73–78. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-47721-9_8.

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"Distributed Windings in ac Machinery." In Analysis of Electric Machinery and Drive Systems, 53–85. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118524336.ch2.

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"Introduction to the Design of Electric Machinery." In Analysis of Electric Machinery and Drive Systems, 583–622. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118524336.ch15.

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"Basic Principles for Electric Machine Analysis." In Analysis of Electric Machinery and Drive Systems. IEEE, 2009. http://dx.doi.org/10.1109/9780470544167.ch1.

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"Appendix A: Measurement and Estimation of Parameters of Electric Machinery." In Control of Electric Machine Drive Systems, 354–80. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470876541.app1.

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"Reference-Frame Theory." In Analysis of Electric Machinery and Drive Systems, 86–120. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118524336.ch3.

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"Appendix A: Trigonometric Relations, Constants and Conversion Factors and Abbreviations." In Analysis of Electric Machinery and Drive Systems, 623–25. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118524336.app1.

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"Appendix B: Carter's Coefficient." In Analysis of Electric Machinery and Drive Systems, 626–28. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118524336.app2.

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"Appendix C: Leakage Inductance." In Analysis of Electric Machinery and Drive Systems, 629–35. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118524336.app3.

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"Theory of Electromechanical Energy Conversion." In Analysis of Electric Machinery and Drive Systems, 1–52. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118524336.ch1.

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Conference papers on the topic "Electric machinery - Excitation systems"

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Zhang Fengge, Jia Guanglong, Wang Xiuping, and Jin Shi. "Research on performance of brushless electric excitation synchronous machine." In 2013 International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2013. http://dx.doi.org/10.1109/icems.2013.6754493.

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Liang, Kong, Wen Xuhui, and Fan Tao. "Influence of electric excitation path and field current on the inductances of parallel hybrid excitation machine." In 2011 International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2011. http://dx.doi.org/10.1109/icems.2011.6073690.

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Liu, Cong, Wenliang Zhao, Yan Liu, and Byung-il Kwon. "Analysis of a Novel Hybrid Excitation Synchronous Motor with Asymmetric Rotor." In 2020 IEEE Student Conference on Electric Machines and Systems (SCEMS). IEEE, 2020. http://dx.doi.org/10.1109/scems48876.2020.9352374.

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Wang, Yu, and Zhiquan Deng. "Control of a hybrid excitation machine with open-winding structure for hybrid electric vehicles." In 2014 17th International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2014. http://dx.doi.org/10.1109/icems.2014.7013994.

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Yang, Zhishuo, Wenliang Zhao, Yan Liu, Xiuhe Wang, and Byung-il Kwon. "Design and Optimization of Hybrid Excitation Synchronous Machine Based on Multi-objective Genetic Algorithm." In 2020 IEEE Student Conference on Electric Machines and Systems (SCEMS). IEEE, 2020. http://dx.doi.org/10.1109/scems48876.2020.9352267.

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Carden, Eoin Peter, and Mattias Lindblad. "Operational Modal Analysis of Torsional Modes in Rotating Machinery." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26305.

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Traditional experimental modal testing techniques rely on controlled and measured excitation together with measured responses in order to identify the mode shape, natural frequency and damping factor of each mode. Applying a controlled and measured excitation to a rotor train when in operation is logistically difficult and especially challenging in the field. Operational modal analysis (OMA) identifies the modal parameters of a system from measurement of response due to some (unknown) excitation. OMA has proven successful over the past several decades on non-rotating structures but has relatively rarely been applied to rotating machinery. Case studies are presented demonstrating the use of OMA in identifying torsional modes on an electric motor driven reciprocating compressor, on a diesel engine driven fire water pump and on a marine propulsion system. In contrast to lateral modes, torsional modes of rotor trains are typically not speed dependent. However phenomena exist whereby the torsional modes may be different at stand still, off-load and at different loads. The case studies provide examples of such phenomena and also of significant differences between predicted and measured behaviour which suggests that improvements in industrial practice would be beneficial. Such improvements should be based on reconciliation of measured and predicted behaviour and OMA offers a valuable tool to facilitate this. OMA provides a significant benefit in investigating and understanding torsional behaviour in operation.
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Sulaiman, Erwan, Takashi Kosaka, and Nobuyuki Matsui. "A novel hybrid excitation flux switching synchronous machine for a high-speed hybrid electric vehicle applications." In 2011 International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2011. http://dx.doi.org/10.1109/icems.2011.6073505.

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Feshin, Aleksandr O., Evgeniy N. Popkov, Aleksey S. Adalev, Vladimir G. Kuchinskiy, and Lev A. Koshcheev. "The Macromodel of a Six-Phase Synchronous Machine with Combined Excitation for Electric Power Systems Processes Study." In 2021 IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (ElConRus). IEEE, 2021. http://dx.doi.org/10.1109/elconrus51938.2021.9396617.

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Geng, Weiwei, Zhuoran Zhang, and Qiang Li. "Concept and Electromagnetic Design of a New Axial Flux Hybrid Excitation Motor for In-wheel Motor Driven Electric Vehicle." In 2019 22nd International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2019. http://dx.doi.org/10.1109/icems.2019.8922430.

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Adachi, Kazuhiko, and Tatsuya Sakamoto. "Theoretical and Experimental Evaluation of System Energy Balance and Power Generation Efficiency for Piezocomposite Vibration Energy Harvester Under Low Intensity Excitation Condition." In ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-8157.

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In the authors’ previous study, the vibration energy harvester of the piezoelectric bimorph cantilever type was proposed for vibration condition monitoring applications of industrial rotating machinery. According to an ISO standard, vibration level of newly commissioned class I rotating machinery is under 0.71mm/sec rms in all frequency range. Authors assumed that the typical casing or pedestal vibration amplitude of the rotating machinery was 0.71 mm/sec rms and this low intensity excitation condition was the input for experimental evaluation of the voltage generation performance of the piezocomposit vibration energy harvester. The vibration energy harvester consists of the surface bonded two Macro-Fiber Composites (MFCs). In this study, energy transfer efficiency was derived from the system energy balance during the natural period of the proposed vibration energy harvester. Energy balance equations were successfully obtained from the governing equations of the piezoelectrically coupled electromechanical system. The maximum AC power through 114.3 Kilo-Ohm resistor which includes instrument internal resistances experimentally obtained 242.07 microwatt when subjected to vibration source input magnitude of 0.71 mm/s rms at the resonant frequency of the harvester (29.42 Hz). The impedance matching between MFCs and the electrical resistive load was effective for maximizing AC power transfer of the vibration energy harvester. Estimated energy transfer from mechanical system to electrical system shows the agreement with the experimentally evaluated generating power during the natural period of the vibration energy harvester with about 3% difference. Estimated energy transfer efficiency was about 30% for different excitation magnitudes: 0.71, 0.568 and 0.355 mm/sec rms.
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