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Prediction Of Performance Of Large Synchronous Machines With Skewed Stators
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Book Synopsis Prediction of Performance of Large Synchronous Machines with Skewed Stators by : Svetlana Gennadievna Troitskaia
Download or read book Prediction of Performance of Large Synchronous Machines with Skewed Stators written by Svetlana Gennadievna Troitskaia and published by . This book was released on 2008 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance and Parameter Prediction of Large Synchronous Machines from Physical Dimensions by : David D. Heberle
Download or read book Performance and Parameter Prediction of Large Synchronous Machines from Physical Dimensions written by David D. Heberle and published by . This book was released on 1994 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: A project funded by the Southern California Edison (SCE) Company, Research Center of Irwindale, California, has supported the development of a performance and parameter prediction software program for use during the refurbishment of large synchronous machines, turbine generators, and synchronous condensers. The computer program was developed for SCE to allow user friendly input of a machine's physical parameters such as pole/field/winding/stator dimensions, type of steel, and other related information in order to calculate the machine's reactances, time constants, and performance curves. The program also allows some degree of design calculation to be performed in order to meet certain design criteria where appropriate. The theory behind the calculations upon which the electrical calculations are built is obtained primarily from literature published in the early 1950's. Since that time, however, machine design has progressed into ever larger generators, most often in the hundreds of Megawatt range with some units exceeding one thousand Megawatts. This size increase has established the practice of winding the stator coils into parallel circuits to maintain acceptable flux and generated voltage levels. These design practices justify a re-examination of the traditional methods used to calculate a machine's reactances and time constants. Accordingly, the use of parallel circuits in the stator winding and their effect on machine parameters has not, to this author's knowledge, been addressed in public literature. These issues are exam fled and modifications to the traditional formulas have been derived for the reactances along with the process of carrying out the calculations on a per pole basis. In addition, the calculation of the parameter and performance equations of a machine are suitable for implementation on a computer due to the length and often iterative calculation procedures. The procedures used to calculate the capability and saturation curves directly from the machine's physical dimensions are developed. During development of the program a forty megawatt generator was measured in order to test and debug the program. Results of this test case are presented and compared to test values obtained at the time of the generator's installation.
Book Synopsis Conference Record, Industry Applications Society, IEEE-IAS Annual Meeting (1981) by : IEEE Industry Applications Society
Download or read book Conference Record, Industry Applications Society, IEEE-IAS Annual Meeting (1981) written by IEEE Industry Applications Society and published by . This book was released on 2005 with total page 890 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modeling, Design, and Optimization of Permanent Magnet Synchronous Machines by : Matthew Gates Angle
Download or read book Modeling, Design, and Optimization of Permanent Magnet Synchronous Machines written by Matthew Gates Angle and published by . This book was released on 2016 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: Improvement of performance of robots has necessitated technological advances in control algorithms, mechanical structures, and electric machines. Running, legged robots have presented challenges in the area of electric machinery in particular. In addition to the low-speed, high-torque, low-mass requirements on the machines, the act of running results in an unconventional drive cycle that consists of brief periods of high torque followed by long stretches of minimal torque requirement, a performance envelope that is not matched by commercially-available machines. An optimized motor would dissipate the minimum possible power over the given drive cycle, lowering temperatures and potentially reducing required battery mass or extending range. These performance requirements have motivated faster modeling techniques to enable optimization of designs for these unconventional applications. This thesis presents a novel, fast modeling method for permanent magnet synchronous machines consisting of a hybrid model comprising an explicit Maxwell solution and a Flux Tube solution. The Maxwell solution is performed for the rotor and airgap of the machine, where geometries are simple and materials are homogeneous. The stator, with its geometric complexities and non-linear materials, is modeled with a lumped-parameter model based on ux tubes. The two models are then stitched together, forced to be self-consistent with boundary conditions, and allowed to converge. This captures effects such as cogging torque as well as saturation of the core materials. The method is approximately four orders of magnitude faster than a reference finite element program (0.01 s versus 100 s) for the same accuracy. The modeling method is implemented for two topologies of surface-mount permanent-magnet machines, an internal-rotor machine and an external-rotor machine. It is then used to optimize machine design to a given drive cycle, including effects of core loss. A machine is built to demonstrate the validity of the model and optimization method and test results match predictions of instantaneous torque to within 5% at the worst point. Cogging torque is another aspect of performance that is important to machines for robotics and other applications. These pulsations in torque caused by magnet alignment with geometric features in the stator result in undesired vibrations and issues with control. One method, based on skew, for reducing or eliminating cogging torque is explored, and a simple analytical technique to predict the eect of skew is presented. Based on the machine optimized for the Cheetah, two additional machines were built to explore the effects of cogging: a skewed-rotor machine, and a skewed- stator machine. Each demonstrated reduction of a particular cogging harmonic or all of the cogging. The skewed machines reduced cogging by approximately 85%. Novel magnet shapes which further reduce cogging are presented and finite element modeling suggests that they can further reduce cogging by 60% over a straight skew. The design and optimization tools developed herein and described above were used to optimize a motor for the MIT Cheetah Robot. The resulting motor showed nearly an order of magnitude increase in torque density when compared to commercial, off-the-shelf machines (1.3 kg vs 820 g and 10 Nm vs 28 Nm) with simultaneous improvements to efficiency.
Book Synopsis Prediction of Synchronous Machine Performance Including Saliency, Nonlinearity, and Damping by : Charuay Boonyubol
Download or read book Prediction of Synchronous Machine Performance Including Saliency, Nonlinearity, and Damping written by Charuay Boonyubol and published by . This book was released on 1962 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 1994 ANSYS Conference Proceedings by : David Dietrich
Download or read book 1994 ANSYS Conference Proceedings written by David Dietrich and published by . This book was released on 1994 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electromechanical Control Technology and Transportation by : Xiaoling Jia
Download or read book Electromechanical Control Technology and Transportation written by Xiaoling Jia and published by CRC Press. This book was released on 2017-05-12 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 2017 2nd International Conference on Electromechanical Control Technology and Transportation (ICECTT 2017) was held on January 14–15, 2017 in Zhuhai, China. ICECTT 2017 brought together academics and industrial experts in the field of electromechanical control technology and transportation to a common forum. The primary goal of the conference was to promote research and developmental activities in electromechanical control technology and transportation. Another goal was to promote exchange of scientific information between researchers, developers, engineers, students, and practitioners working all around the world. The conference will be held every year thus making it an ideal platform for people to share views and experiences in electromechanical control technology and transportation and related areas.
Book Synopsis Electrical & Electronics Abstracts by :
Download or read book Electrical & Electronics Abstracts written by and published by . This book was released on 1997 with total page 1904 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transactions of the American Institute of Electrical Engineers by : American Institute of Electrical Engineers
Download or read book Transactions of the American Institute of Electrical Engineers written by American Institute of Electrical Engineers and published by . This book was released on 1959 with total page 1750 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis of Synchronous Machines by : T.A. Lipo
Download or read book Analysis of Synchronous Machines written by T.A. Lipo and published by CRC Press. This book was released on 2017-12-19 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analysis of Synchronous Machines, Second Edition is a thoroughly modern treatment of an old subject. Courses generally teach about synchronous machines by introducing the steady-state per phase equivalent circuit without a clear, thorough presentation of the source of this circuit representation, which is a crucial aspect. Taking a different approach, this book provides a deeper understanding of complex electromechanical drives. Focusing on the terminal rather than on the internal characteristics of machines, the book begins with the general concept of winding functions, describing the placement of any practical winding in the slots of the machine. This representation enables readers to clearly understand the calculation of all relevant self- and mutual inductances of the machine. It also helps them to more easily conceptualize the machine in a rotating system of coordinates, at which point they can clearly understand the origin of this important representation of the machine. Provides numerical examples Addresses Park’s equations starting from winding functions Describes operation of a synchronous machine as an LCI motor drive Presents synchronous machine transient simulation, as well as voltage regulation Applying his experience from more than 30 years of teaching the subject at the University of Wisconsin, author T.A. Lipo presents the solution of the circuit both in classical form using phasor representation and also by introducing an approach that applies MathCAD®, which greatly simplifies and expands the average student’s problem-solving capability. The remainder of the text describes how to deal with various types of transients—such as constant speed transients—as well as unbalanced operation and faults and small signal modeling for transient stability and dynamic stability. Finally, the author addresses large signal modeling using MATLAB®/Simulink®, for complete solution of the non-linear equations of the salient pole synchronous machine. A valuable tool for learning, this updated edition offers thoroughly revised content, adding new detail and better-quality figures.
Download or read book Conference Publication written by and published by . This book was released on 1989 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Science Abstracts written by and published by . This book was released on 1995 with total page 1874 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Proceedings of the Institution of Electrical Engineers by : Institution of Electrical Engineers
Download or read book The Proceedings of the Institution of Electrical Engineers written by Institution of Electrical Engineers and published by . This book was released on 1959 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis IEEE International Electric Machines and Drives Conference Record by :
Download or read book IEEE International Electric Machines and Drives Conference Record written by and published by . This book was released on 1997 with total page 750 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fifth European Conference on Power Electronics and Applications: Drives II by :
Download or read book Fifth European Conference on Power Electronics and Applications: Drives II written by and published by . This book was released on 1993 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design of Rotating Electrical Machines by : Juha Pyrhonen
Download or read book Design of Rotating Electrical Machines written by Juha Pyrhonen and published by John Wiley & Sons. This book was released on 2013-09-26 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt: In one complete volume, this essential reference presents an in-depth overview of the theoretical principles and techniques of electrical machine design. This timely new edition offers up-to-date theory and guidelines for the design of electrical machines, taking into account recent advances in permanent magnet machines as well as synchronous reluctance machines. New coverage includes: Brand new material on the ecological impact of the motors, covering the eco-design principles of rotating electrical machines An expanded section on the design of permanent magnet synchronous machines, now reporting on the design of tooth-coil, high-torque permanent magnet machines and their properties Large updates and new material on synchronous reluctance machines, air-gap inductance, losses in and resistivity of permanent magnets (PM), operating point of loaded PM circuit, PM machine design, and minimizing the losses in electrical machines> End-of-chapter exercises and new direct design examples with methods and solutions to real design problems> A supplementary website hosts two machine design examples created with MATHCAD: rotor surface magnet permanent magnet machine and squirrel cage induction machine calculations. Also a MATLAB code for optimizing the design of an induction motor is provided Outlining a step-by-step sequence of machine design, this book enables electrical machine designers to design rotating electrical machines. With a thorough treatment of all existing and emerging technologies in the field, it is a useful manual for professionals working in the diagnosis of electrical machines and drives. A rigorous introduction to the theoretical principles and techniques makes the book invaluable to senior electrical engineering students, postgraduates, researchers and university lecturers involved in electrical drives technology and electromechanical energy conversion.
Book Synopsis Design of axial-flux permanent-magnet low-speed machines and performance comparison between radial-flux and axial-flux machines by : Asko Parviainen
Download or read book Design of axial-flux permanent-magnet low-speed machines and performance comparison between radial-flux and axial-flux machines written by Asko Parviainen and published by . This book was released on 2005 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt:
