Rotating Capacitors with Spiral Groove Features for Hydrodynamic Gap Maintenance in Power Conversion Systems PDF Download
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Author: Ryan Patrick Knippel
Publisher:
ISBN:
Category :
Languages : en
Pages : 202
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Book Description
A survey of rotary power conversion systems based on electrostatics shows favorable features in materials and manufacturing, but they lag the gap power density of electromagnetic approaches by orders of magnitude. Rather than trying to match the air gap power density of electromagnetics, this work pursues modes of maximizing the capacitive surface area while minimizing the dielectric gap present in electrostatically coupled systems. Utilizing hydrodynamic bearing structures integrated into the surface of the rotating capacitors, the dielectric gap may be maintained at distances approaching tens of microns over tens of centimeters up to speeds exceeding 30,000 rotations per minute. This approach eliminates the longstanding air gap field impediment to electrostatic systems by increasing volumetric power density. The ability of this mechanical approach to enable capacitively coupled system is demonstrated in two areas of power conversion, wireless power transfer and an electric machine platform. The wireless power transfer portion of this research culminates the design and implementation of a system of axially stacked rotating capacitors for wireless power transfer, known as a capacitive power coupler (CPC). This device delivered 700 W at 6.5 amps of excitation to the field coils of an 80 kW wound field synchronous machine. 6 stator and 5 rotor discs offset by 115 microns comprised each of the two 2.8 nF coupling capacitors, yielding a total capacitor length of 4.98 mm. This design achieved a gap/rotor diameter aspect ratio previously attained only in the MEMs community, opening the way for the development of a macroscale electrostatic mechanical platform. An axial flux PCB based electrostatic induction machine (ESIM) platform utilizing the principles of operation of, and tools resulting from the capacitive coupler was constricted. Structural models based on tensile tests of FR4 were developed to predict safe operation spaces of the ESIM. The final ESIM platform maintains an axial air gap of 57 microns across its 170 mm diameter rotor face (a 1:1500 aspect ratio) and delivers 2.4 W of mechanical power per facing pair of rotor and stator discs. This proof of concept machine provides the first strong mechanical base for future electrical optimization of these machines.
Author: Ryan Patrick Knippel
Publisher:
ISBN:
Category :
Languages : en
Pages : 202
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Book Description
A survey of rotary power conversion systems based on electrostatics shows favorable features in materials and manufacturing, but they lag the gap power density of electromagnetic approaches by orders of magnitude. Rather than trying to match the air gap power density of electromagnetics, this work pursues modes of maximizing the capacitive surface area while minimizing the dielectric gap present in electrostatically coupled systems. Utilizing hydrodynamic bearing structures integrated into the surface of the rotating capacitors, the dielectric gap may be maintained at distances approaching tens of microns over tens of centimeters up to speeds exceeding 30,000 rotations per minute. This approach eliminates the longstanding air gap field impediment to electrostatic systems by increasing volumetric power density. The ability of this mechanical approach to enable capacitively coupled system is demonstrated in two areas of power conversion, wireless power transfer and an electric machine platform. The wireless power transfer portion of this research culminates the design and implementation of a system of axially stacked rotating capacitors for wireless power transfer, known as a capacitive power coupler (CPC). This device delivered 700 W at 6.5 amps of excitation to the field coils of an 80 kW wound field synchronous machine. 6 stator and 5 rotor discs offset by 115 microns comprised each of the two 2.8 nF coupling capacitors, yielding a total capacitor length of 4.98 mm. This design achieved a gap/rotor diameter aspect ratio previously attained only in the MEMs community, opening the way for the development of a macroscale electrostatic mechanical platform. An axial flux PCB based electrostatic induction machine (ESIM) platform utilizing the principles of operation of, and tools resulting from the capacitive coupler was constricted. Structural models based on tensile tests of FR4 were developed to predict safe operation spaces of the ESIM. The final ESIM platform maintains an axial air gap of 57 microns across its 170 mm diameter rotor face (a 1:1500 aspect ratio) and delivers 2.4 W of mechanical power per facing pair of rotor and stator discs. This proof of concept machine provides the first strong mechanical base for future electrical optimization of these machines.
Author: Oliver Heaviside
Publisher:
ISBN:
Category : Electric power
Languages : en
Pages : 594
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Book Description
Author: Henrik Bruus
Publisher: Oxford University Press
ISBN: 0191528587
Category : Science
Languages : en
Pages :
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Book Description
Microfluidics is a young and rapidly expanding scientific discipline, which deals with fluids and solutions in miniaturized systems, the so-called lab-on-a-chip systems. It has applications in chemical engineering, pharmaceutics, biotechnology and medicine. As the lab-on-a-chip systems grow in complexity, a proper theoretical understanding becomes increasingly important. The basic idea of the book is to provide a self-contained formulation of the theoretical framework of microfluidics, and at the same time give physical motivation and examples from lab-on-a-chip technology. After three chapters introducing microfluidics, the governing equations for mass, momentum and energy, and some basic flow solutions, the following 14 chapters treat hydraulic resistance/compliance, diffusion/dispersion, time-dependent flow, capillarity, electro- and magneto-hydrodynamics, thermal transport, two-phase flow, complex flow patterns and acousto-fluidics, as well as the new fields of opto- and nano-fluidics. Throughout the book simple models with analytical solutions are presented to provide the student with a thorough physical understanding of order of magnitudes and various selected microfluidic phenomena and devices. The book grew out of a set of well-tested lecture notes. It is with its many pedagogical exercises designed as a textbook for an advanced undergraduate or first-year graduate course. It is also well suited for self-study.
Author: Jewel B. Barlow
Publisher: John Wiley & Sons
ISBN: 0471557749
Category : Technology & Engineering
Languages : en
Pages : 738
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Book Description
A brand-new edition of the classic guide on low-speed wind tunnel testing While great advances in theoretical and computational methods have been made in recent years, low-speed wind tunnel testing remains essential for obtaining the full range of data needed to guide detailed design decisions for many practical engineering problems. This long-awaited Third Edition of William H. Rae, Jr.'s landmark reference brings together essential information on all aspects of low-speed wind tunnel design, analysis, testing, and instrumentation in one easy-to-use resource. Written by authors who are among the most respected wind tunnel engineers in the world, this edition has been updated to address current topics and applications, and includes coverage of digital electronics, new instrumentation, video and photographic methods, pressure-sensitive paint, and liquid crystal-based measurement methods. The book is organized for quick access to topics of interest, and examines basic test techniques and objectives of modeling and testing aircraft designs in low-speed wind tunnels, as well as applications to fluid motion analysis, automobiles, marine vessels, buildings, bridges, and other structures subject to wind loading. Supplemented with real-world examples throughout, Low-Speed Wind Tunnel Testing, Third Edition is an indispensable resource for aerospace engineering students and professionals, engineers and researchers in the automotive industries, wind tunnel designers, architects, and others who need to get the most from low-speed wind tunnel technology and experiments in their work.
Author: James R. Melcher
Publisher: MIT Press (MA)
ISBN: 9780262131650
Category : Technology & Engineering
Languages : en
Pages : 604
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Book Description
Designed to be used as a graduate-level text and as an engineering reference work, "Continuum Electromechanics" presents a comprehensive development of its subject--the interaction of electromagnetic forces and ponderable media, the mechanical responses to electromagnetic fields, and the reciprocal effects of the material motions produced by those fields. The author's approach is highly interdisciplinary, and he introduces fundamental concepts from such subjects as electrohydrodynamics, magnetohydrodynamics, plasma physics, electron beam engineering, fluid mechanics, heat transfer, and physical chemistry.The applications of continuum electromechanics are also remarkably diverse, and many of them are treated in the book, both because of their intrinsic engineering importance and as a means of illustrating basic principles. Among these applications are the design of rotating machines and synchronous generators, polymer processing, magnetic melting and pumping in metallurgical operations, the processing of plastics and glass, the manufacture of synthetic fibers, inductive and dielectric heating, thermal-to-electrical energy conversion, the control of air pollution, the design of controlled-fusion devices, image processing and printing, the magnetic levitation and propulsion of vehicles, the study of films and membranes, and the analysis of the complex electrokinetic and physicochemical processes that underlie the sensing and motor functions of biological systems. Many of these applications are presented in the form of problems.The book consists of eleven chapters, entitled Introduction to Continuum Electromechanics; Electrodynamic Laws; Approximations, and Relations; Electromagnetic Forces, Force Densities, and Stress Tensors; Electromechanical Kinematics; Energy-Conversion Models and Processes; Charge Migration, Convection, and Relaxation; Magnetic Diffusion and Induction Interactions; Laws, Approximations, and Relations of Fluid Mechanics Statics and Dynamics of Systems Having a Static Equilibrium; Electromechanical Flows; Electromechanics with Thermal and Molecular Diffusion; and Streaming Interactions.
Author: Meherwan P. Boyce
Publisher: Elsevier
ISBN: 0080456898
Category : Mathematics
Languages : en
Pages : 956
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Book Description
The Gas Turbine Engineering Handbook has been the standard for engineers involved in the design, selection, and operation of gas turbines. This revision includes new case histories, the latest techniques, and new designs to comply with recently passed legislation. By keeping the book up to date with new, emerging topics, Boyce ensures that this book will remain the standard and most widely used book in this field. The new Third Edition of the Gas Turbine Engineering Hand Book updates the book to cover the new generation of Advanced gas Turbines. It examines the benefit and some of the major problems that have been encountered by these new turbines. The book keeps abreast of the environmental changes and the industries answer to these new regulations. A new chapter on case histories has been added to enable the engineer in the field to keep abreast of problems that are being encountered and the solutions that have resulted in solving them. - Comprehensive treatment of Gas Turbines from Design to Operation and Maintenance. In depth treatment of Compressors with emphasis on surge, rotating stall, and choke; Combustors with emphasis on Dry Low NOx Combustors; and Turbines with emphasis on Metallurgy and new cooling schemes. An excellent introductory book for the student and field engineers - A special maintenance section dealing with the advanced gas turbines, and special diagnostic charts have been provided that will enable the reader to troubleshoot problems he encounters in the field - The third edition consists of many Case Histories of Gas Turbine problems. This should enable the field engineer to avoid some of these same generic problems
Author: Mehdi Afshari
Publisher: Woodhead Publishing
ISBN: 0081009119
Category : Technology & Engineering
Languages : en
Pages : 650
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Book Description
Electrospun Nanofibers covers advances in the electrospinning process including characterization, testing and modeling of electrospun nanofibers, and electrospinning for particular fiber types and applications. Electrospun Nanofibers offers systematic and comprehensive coverage for academic researchers, industry professionals, and postgraduate students working in the field of fiber science. Electrospinning is the most commercially successful process for the production of nanofibers and rising demand is driving research and development in this field. Rapid progress is being made both in terms of the electrospinning process and in the production of nanofibers with superior chemical and physical properties. Electrospinning is becoming more efficient and more specialized in order to produce particular fiber types such as bicomponent and composite fibers, patterned and 3D nanofibers, carbon nanofibers and nanotubes, and nanofibers derived from chitosan. - Provides systematic and comprehensive coverage of the manufacture, properties, and applications of nanofibers - Covers recent developments in nanofibers materials including electrospinning of bicomponent, chitosan, carbon, and conductive fibers - Brings together expertise from academia and industry to provide comprehensive, up-to-date information on nanofiber research and development - Offers systematic and comprehensive coverage for academic researchers, industry professionals, and postgraduate students working in the field of fiber science
Author: Klaus Mollenhauer
Publisher: Springer Science & Business Media
ISBN: 3540890831
Category : Technology & Engineering
Languages : en
Pages : 632
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Book Description
This machine is destined to completely revolutionize cylinder diesel engine up through large low speed t- engine engineering and replace everything that exists. stroke diesel engines. An appendix lists the most (From Rudolf Diesel’s letter of October 2, 1892 to the important standards and regulations for diesel engines. publisher Julius Springer. ) Further development of diesel engines as economiz- Although Diesel’s stated goal has never been fully ing, clean, powerful and convenient drives for road and achievable of course, the diesel engine indeed revolu- nonroad use has proceeded quite dynamically in the tionized drive systems. This handbook documents the last twenty years in particular. In light of limited oil current state of diesel engine engineering and technol- reserves and the discussion of predicted climate ogy. The impetus to publish a Handbook of Diesel change, development work continues to concentrate Engines grew out of ruminations on Rudolf Diesel’s on reducing fuel consumption and utilizing alternative transformation of his idea for a rational heat engine fuels while keeping exhaust as clean as possible as well into reality more than 100 years ago. Once the patent as further increasing diesel engine power density and was filed in 1892 and work on his engine commenced enhancing operating performance.
Author: Chin-wang Tao
Publisher: World Scientific
ISBN: 9813228180
Category : Technology & Engineering
Languages : en
Pages : 1283
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Book Description
The 2016 International Conference on Mechanics and Materials Science (MMS2016) was held in Guangzhou, China on October 15-16, 2016.Aimed at providing an excellent international academic forum for all the researchers and practitioners, the conference attracted a wide spread participation among all over the universities and research institutes. MMS2016 features unique mixed topics of Mechatronics and Automation, Materials Science and Engineering, Materials Properties, Measuring Methods and Applications.This volume consists of 159 peer-reviewed articles by local and foreign eminent scholars, which cover the frontiers and hot topics in the relevant areas.
Author: Robert Fischer
Publisher: Springer
ISBN: 3319052632
Category : Technology & Engineering
Languages : en
Pages : 372
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Book Description
This book presents essential information on systems and interactions in automotive transmission technology and outlines the methodologies used to analyze and develop transmission concepts and designs. Functions of and interactions between components and subassemblies of transmissions are introduced, providing a basis for designing transmission systems and for determining their potentials and properties in vehicle-specific applications: passenger cars, trucks, buses, tractors and motorcycles. With these fundamentals the presentation provides universal resources for both state-of-the-art and future transmission technologies, including systems for electric and hybrid electric vehicles.
