DOCSLIB.ORG

Leviduction — a Study in Electromagnetic Levitation

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Leviduction — a Study in Electromagnetic Levitation LEVIDUCTION — A STUDY IN ELECTROMAGNETIC LEVITATION by Alan Attwood, B.Sc.(Eng.), A.C.G.I. July 1978 A thesis submitted for the degree of Doctor of Philosophy of the University of London and for the Diploma of Imperial College Electrical Engineering Department, Imperial College, London SW7. 2 ABSTRACT OF THESIS In 1972, by purely empirical methods, a new type of electromagnetic machine was discovered - a linear induction motor capable of producing levitating and laterally-guiding forces in addition to the normal axial propulsive force. The new machine was called an "electromagnetic river". This thesis describes some of the researches which followed the invention. Firstly several circular and linear versions of the new machine were investigated. Their novel abilities offer some immediate possibilities for industrial exploitation, particular examples being a rotary version acting as a frictionless bearing and a linear version capable of operating in a back-to-back "shuttle" mode. The latter may make it practicable to replace the noisy, impulsive mechanical method for propulsion of a shuttle across a weaving loom by a silent electrical system. More generally the new principle could be applied both to low-speed situations where there is a need for support and guidance without physical contact, and to more dramatic possibilities at high speed where passenger-carrying vehicles could be lifted, guided and propelled by a single set of electromagnetic coils. Secondly a series of experiments was performed on laboratory- scale models, with the aim of simulating the behaviour of a large- scale electromagnetic river. In an effort to understand the mechanism of stability a new experimental procedure was developed. This allows determination of the distribution of electromagnetic forces acting on a floating conducting plate, from a knowledge only of the surrounding magnetic field. Several theories are discussed concerning the stability mechanism; no single one however has yet succeeded in explaining every aspect of the phenomenon. 3 Finally a further new invention is described - a "Mark Two" electromagnetic river, superior to the original in all three axes of lift, guidance and propulsion. Time permitted only a preliminary investigation of this most recent class of machine. A Note on "Leviduction" Levitation by electromagnetic induction is but one of several distinct methods for the provision of lifting forces by the use of electric and magnetic phenomena. A few of the alternative methods are also capable of providing lateral stabilisation (which becomes guidance if the supported object is moving).. The acronym "Maglev" was coined for one of the better known of these systems, more fully titled "levitation and stabilisation by means of magnetic forces of attraction". However there has been a tendency to apply this name to the whole subject of electromagnetic levitation, regardless of the particular system under discussion. Such use unfortunately tends to carry with it the implication that the recognised drawbacks to the Maglev system also apply in general. To emphasise the difference between Maglev and the electromagnetic system that forms the subject of this thesis, it was decided to invent a name applicable only to the latter. The word coined was "leviduction", which is to be regarded as synonymous with "levitation and stabilisation by means of repelling forces between primary and induced secondary currents". There is, however, little call for use of the new word within the body of the thesis, since apart from a few well-defined exceptions the entire subject matter comes under the heading "leviduction". No confusion need arise. 4 ACKNOWLEDGMENTS A large number of people were involved in the work that is described in this thesis. To acknowledge all would be impossible, but a particular debt is owed to three groups of personnel. Firstly the academic staff in and around the laboratory at Imperial College. At the top of the list (in more ways than one) is Professor Eric Laithwaite, whose supervision, guidance and above all enthusiasm kept the work going throughout the three-year period with which this report is concerned. Also present at the time was Dr. J.F. Eastham (now Professor Eastham of Bath University), who with Professor Laithwaite was responsible for the research activities described in Chapter 1, and took much part in all that followed. Many thanks are due also to Dr. H. Bolton and Dr. E.M. Freeman for their invaluable contributions in the way of discussion and ideas, and special thanks to Elizabeth Boden for her help and her quiet and patient organisation of all administrative and secretarial affairs. None of the work described could have been carried out without the support of the technical staff, headed by the ever-helpful Barry Owen in the laboratory and Colin Jones in the workshop. Particular thanks are due to Cliff Johnson who was responsible for building many of the machines described, and also to Jim McEwen who wound the coils for almost all of the machines, and whose effective but original coil-winding techniques sometimes led to even more permutations of the machines than had been anticipated! Two people outside Imperial College who deserve special mention are Mr J.G. Steel of the Central Electricity Research Laboratories, Leatherhead, who took continued interest in the progress of the work and made a large number of helpful comments on the presentation of this report, and my father, now retired to the mountains of North Wales, whose attention to fine detail proved of immense value in the final presentation. Lastly appreciation should be expressed of the part played by Paul Jarvis, postgraduate student at Imperial College, and "Mirabel" the friendly college computer, without whose help the diagrams in their present form would not have been possible. 5 CONTENTS Chapter Page INTRODUCTION 8 1. THE ORIGIN OF THE ELECTROMAGNETIC RIVER 9 1.1 Transpo '72 9 1.2 The Birth of the Electromagnetic River 13 1.3 The Washington Model 17 1.4 An Expanding Geometry 23 2. STABILITY IN ALL AXES 28 2.1 Longitudinal stabilisation 28 2.2 The Magic Carpet 30 2.3 Height, stability and efficiency of levitation 34 2.4 Sustained oscillations 38 3. ELECTROMAGNETIC SPRINGS, WHIRLPOOLS AND OTHER THINGS 43 3.1 The machine with long poles 43 3.2 The double-loop pattern 46 3.3 Circular levitators 50 3.4 The Electromagnetic Whirlpool 55 4. DISTRIBUTION OF FORCE ON FLOATING PLATES 59 4.1 Rotor surface voltage distribution 59 4.2 Rotor surface flux 65 4.3 An analytical approach 70 4.4 Forces by Maxwell Second Stress 75 4.5 Pictorial representation of force distribution 86 5. THE PHASE-MIXED_ ELECTROMAGNETIC RIVER 90 5.1 Improvements in propulsion 90 5.2 Lift and guidance "for free" 93 5.3 The seven-metre stator 97 5.4 The Electromagnetic Shuttle 102 - '6- Chapter Page 6. LOW FLYING AIRCRAFT 110 6.1 Steel wheel. upon steel rail 111 6.2 Contact-free systems 117 6.3 The Electromagnetic River for high-speed transport 126 6.4 Protection against loss of supply 130 6.5 Secondary support system and speed restrictions 133 6.6 Choice of linear motor design 135 7. LABORATORY SIMULATION OF LARGE-SCALE ELECTROMAGNETIC RIVERS 140 7.1 The "Catamaran" Machine 140 7.2 Variable stator core dimensions - use of gramme-ring wound stator blocks 146 7.3 Simulation of a wide electromagnetic river by gramme-ring wound blocks 151 7.4 Human levitation 156 7.5 Levitators turned "the right way up" 158 7.6 The Electromagnetic Track Joint 161 7.7 Electromagnetic Scale Modelling 166 7.8 Tests at high frequency 169 7.9 Tests on load-bearing rotors 175 7.10 Dynamic stability tests 178 7.11 Review of Chapter 7 180 8. THE LECTURE NOTE FLOATER 183 8.1 An Annular Magic Carpet 184 8.2 A square levitator 187 8.3 Return to gramme-ring wound stator blocks 193 8.4 Success at last 197 9. THEORY 200 9.1 A Hypothesis 200 9.2 The Jumping Ring 201 9.3 Arguments with limitations 208 9.4 Stability by attracting and repelling currents 212 7 Chapter Page 9.5 Stability over a conventional linear motor 217 9.6 Stability by Shaded-Pole Action 219 9.7 Stability by Rules of Thumb 224 9.8 "Hills of Flux" 228 10. CONCLUSIONS AND RECOMMENDATIONS- 234 10.1 Review and suggestions for further work 234 10.2 Addition of backing steel 237 11. POSTSCRIPT - THE XI-CORE MOTOR 240 11.1 Kilowatts per tonne . 240 11.2 A new geometry 243 11.3 Design of the Xi-core motor 246 11.4 Performance of the Xi-core motor 250 11.5 Boundaries of stability 255 REFERENCES 263 • APPENDIX A. Engineering details of four machines 268 VoLu.rrie 11 2/7._ APPENDIX 13. An F ti-ernat-ive tl,eoreE,ca.l Rpproa.c h 273 flPPEIJD►x G. Rrfd.1ybiG4.t Q6riva.ionS of- t•ie Mablkewi 2.97 7cpressiont vied. iM. Appe » Lac Q APPENDix D. Lornpu.Fer Subroukines) Pu.ncboiS 0.41 Pro 3ra4•4 30q APPEND ix E. Cowipu.l--er Sourc,a Gode List. i»gb 336 8 INTRODUCTION Few inventions or discoveries are made by the direct process of defining a problem, setting out methodically to investigate all possible ideas for solution, gradually eliminating those which are unfruitful until the one remaining solution emerges as the perfect answer - and all in exactly three years, neatly to complete a higher degree! Equally, seldom is success achieved by continually pondering over a problem, turning it around and around until suddenly, in a flash of inspiration, the solution is clear - "Eureka" - in the manner of Archimedes. More often the process is one of fruitless lines of investigation, dead ends, turnings back, followed by an apparently fortuitous "grasshopper jump" into an entirely new plane and direction for no logical reason at all.
Load more

Recommended publications
  • 2017–2018 Annual Research Report
    RESEARCH & PUBLIC HISTORY ANNUAL REPORT 2017–2018 FOREWORD FOREWORD SALLY MACDONALD Director, Science and Industry Museum, Manchester Welcome to our fourth Research and Public History Annual Report, covering the academic year 2017/18. This year saw the adoption of the Science Museum Group’s new Research Strategy, which sets the framework for our research activity for the coming five years. The Strategy (see pp xx) declares our bold ambition to be globally the most research-informed science museum group, so that research underpins most aspects of our work, from collections management through to exhibition development and the design of new galleries and digital resources. In order to do this, we’ve committed to supporting our colleagues across many teams to develop their research potential. And we want to build our research networks to support an even wider range of collaborations. Our conferences and workshops are vital for building such networks, and limbs, for example; another takes ABOVE: this year’s Report highlights several the form of an ‘in conversation’ Sally Macdonald Director, Science and Industry focused on specific topics of current between an archivist and artist, Museum, Manchester interest: for example, workshops on while yet another discusses the electricity to support Electricity: The challenges and opportunities of This year’s Report highlights the Spark Of Life exhibition at the Science collaborating across disciplines variety of their studies, emphasising and Industry Museum Manchester, and different ‘habits of mind’. the impact not only for our museums symposiums on Wounded as part of Our Spring Journal this year, guest- but for the partner institution and the Science Museum’s research for edited by Frank Trentmann of Birkbeck the students themselves.
    [Show full text]
  • UNIVERSITY of CAMBRIDGE INTERNATIONAL EXAMINATIONS Cambridge International Level 3 Pre-U Certificate Principal Subject
    UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS Cambridge International Level 3 Pre-U Certificate Principal Subject PHYSICS 9792/02 Paper 2 Part A Written Paper May/June 2012 PRE-RELEASED MATERIAL The question in Section B of Paper 2 will relate to the subject matter in these extracts. You should read through this booklet before the examination. The extracts on the following pages are taken from a variety of sources. University of Cambridge International Examinations does not necessarily endorse the reasoning expressed by the original authors, some of whom may use unconventional Physics terminology and non-SI units. You are also encouraged to read around the topic, and to consider the issues raised, so that you can draw on all your knowledge of Physics when answering the questions. You will be provided with a copy of this booklet in the examination. This document consists of 8 printed pages. DC (LEO/JG) 51113/1 © UCLES 2012 [Turn over 2 Extract 1: How Maglev Trains Work If you’ve been to an airport lately, you’ve probably noticed that air travel is becoming more and more congested. Despite frequent delays, aeroplanes still provide the fastest way to travel hundreds or thousands of miles. Passenger air travel revolutionised the transport industry in the last century, letting people traverse great distances in a matter of hours instead of days or weeks. Fig. E1.1 The first commercial maglev line made its debut in December of 2003. The only alternatives to aeroplanes – feet, cars, buses, boats and conventional trains – are just too slow for today’s fast-paced society.
    [Show full text]
  • MODERN TRENDS in TRACTION Mr
    International Journal of Scientific & Engineering Research Volume 12, Issue 1, January-2021 908 ISSN 2229-5518 MODERN TRENDS IN TRACTION Mr. Ankit Aloni Abstract— The modern trend in the railway sector is the Maglev trains. Maglev, also called magnetic levitation train or maglev train, a floating vehi- cle for land transportation that's supported by either electromagnetic attraction or repulsion. The maglev transportation have very benefits such as high level of safety, no derailment, reliability, high speed, ecofriendly, low maintenance fees, energy efficient, the quietest transportation system, less space required, climbing grade and maneuverability, etc. This paper involves all the aspects, design, technology, applications, future uses of these trains. Index Terms— Electrodynamic suspension, Electromagnetic suspension, Inductrack, stability, power-use, magnetic induction —————————— —————————— 1 INTRODUCTION hat if you'll travel from NY to LA in only under seven hours without boarding a plane? It could be 2 HOW MAGLEV WORKS? Wpossible on a Maglev train. This idea was raised by a physics scientist in 1909 by Rob- "A Maglev train vehicle is only a case with magnets on the ert H. Goddard the American rocket scientist. After that a four corners," says Jesse Powell, the child of the Maglev de- British electrical engineer Eric Laithwaite developed the signer. It's a smidgen more unpredictable than that, however first full sized working model of linear motor induction af- the idea is basic. The magnets utilized are superconducting, ter that many scientist came and improved the technology. which implies that when they are cooled to under 450 degrees The world first commercial maglev system was a low- Fahrenheit under zero, they can create attractive fields up to speed maglev shuttle that ran between the airport terminal multiple times more grounded than customary electromag- of Birmingham international airport and Birmingham in- nets, enough to suspend and move a train.
    [Show full text]
  • Maglev and Aérotrain: Why and How Europe Killed Its Own High
    MAGLEV AND AÉROTRAIN Why and How Europe Killed Its Own High-Speed Transportation Plans by Karel Vereycken Sept. 29—When considering the breathtaking expansion of high-speed rail networks in China—including its am- bitious plans for the con- struction of maglev sys- tems—it may come as a shock to learn that more than forty years ago, it was Europe that was leading the way in the development of these ad- vanced technologies. France, Germany, Italy and Britain were all pushing the enve- Transrapid lope for the creation of a Transrapid 08 maglev train, at the Emsland Test Facility, in Emsland, Germany. Europe-wide, 21st Century transportation system, and were poised for the develop- why European states scrapped the very best of their na- ment and deployment of maglev and related systems. tional research on the new revolutionary technologies Yet almost all of these efforts were systematically shut that were being spun off from the aerospace programs down. Why? of the Kennedy era. A fresh look at the archives—the 1978 Working As I will demonstrate, the archives indicate that this Papers of the Strasbourg-based Parliamentary Assem- was done, top-down, in great secret, in the name of Eu- bly of the Council of Europe1—provides insights into ropean “unity,” demanding that each nation sacrifice its own scientific contribution, however valuable it might be! 1. The Council of Europe (not to be confused with the European Coun- Typical was the sabotage of the Transrapid, the Ger- cil, on which sit the heads of state and heads of government), is a 47- nation international organization (much larger than the European man-developed high-speed monorail train using mag- Union) dedicated to upholding human rights, democracy and the rule of netic levitation, for which planning started in 1969.
    [Show full text]
  • Advanced Systems Advanced Technology
    ADVANCED SYSTEMS a n d ADVANCED TECHNOLOGY A SUMMARY OF TEN YEARS OF ADVANCED RESEARCH AND DEVELOPMENT BY TH E FEDERAL RAILROAD ADMINISTRATION O c to b e r 1 , 1 9 7 7 Abstracted from Report FRA/ORD-7 7 / 2 7 by Office of Research and Development Federal Railroad Administration Department of Transportation Washington, D. C. 25 - Rsc D Management C o n t e n t s A d v a n c e d S y s t e m s Page Systems Engineering ........................ 1 Tracked Air Cushion Vehicles ......... 3 Component Research.............. 4 Tracked Levitated Research Vehicle..................................... 5 Prototype Tracked Air Cushion Vehicle...............-.................... 8 Magnetic Levitation....................... 10 Tube Vehicles .................................... 13 Multimodal........................................15 Suspended Vehicles ......................... 15 A d v a n c e d T e c h n o l o g y Page Linear Electric Motors ....................... 17 Linear Induction Motor Research Vehicle....................... 18 Mathematical Models................... 21 Single-sided Motors....................... 21 Guideways........................................22 Power Conditioning.........................23 Controls........................................... 26 Obstacle Detection...........................27 Communications.............................. 28 Appendix: Active FRA Programs a. Advanced Systems ....................... 29 A d v a n c e d S y s t e m s A question facing O H S G T in 1965 was: pose of extending the H S G T state-of-the- “H o w fast is high-speed ground transporta­ art review performed by MIT in 1965. The tion?” O H S G T researchers developed an systems engineers then derived a repre­ answer based on power requirements and sentative transportation system from each energy consumption. A plot of the power group, and m a d e detailed engineering required vs.
    [Show full text]
  • WRAP 1&4 Front Front and Back.Indd
    2 felix FRIDAY 09 DECEMBER 1949 Extracts from the first issue of Felix, published on the 9th of December, 1949 The need has been felt for some time for a frequently published journal to comment upon the affairs of the College whilst they are still topical, and to bring to the attention of its members the activities of Clubs and Societies of which people at present know little, and knowing little, tend to care even less. This is a function which clearly cannot be performed by THE PHOENIX, particularly since that estimable bird is now to appear only twice a year, and so FELIX has come to meet the need. We do not intend to encroach upon the literary field covered by THE PHOENIX; rather do we intend to be complementary to that journal, even if not always complimentary. Neither are we in any way connected with it, nor are we its offspring. (In any case, this unfortunate bird is presumably unable to produce any offspring, since only one bird exists at any one time, rising from the ashes of its predecessor. Perhaps this accounts for its doleful appearance). No, THE PHOENIX will remain an essentially literary magazine, whereas we shall content ourselves with providing a commentary upon events and personalities. The success or failure of this paper depends principally upon you, our readers. In the first place we depend upon you to produce many of our articles and reports, since our staff cannot themselves attend and report every College event. Secondly we depend upon you to maintain a lively correspondence in our columns.
    [Show full text]
  • Linear Motor-Powered Transportation: History, Present
    INVITED PAPER Linear Motor-Powered Transportation: History, Present Status, and Future Outlook This review explains the operation of various types of linear motors used in maglev systems, discusses and compares their suitability, and describes the scope of worldwide maglev developments. By Rolf Hellinger and Peter Mnich ABSTRACT | An outline of the different fields of application for II. REASONS FOR LINEAR linear motors in transportation is given. The different types of MOTOR APPLICATION IN linear motors are described and compared. The current status TRANSPORTATION SYSTEMS of the different linear motors used in the transportation sector Fresh impetus for worldwide research into linear motor- is analyzed. Finally, a look at worldwide activities and future powered transportation systems came from high-speed prospects is presented. maglev systems, on account of the need to develop not only a contactless levitation system but also a contact-free KEYWORDS | Electrodynamic levitation; electromagnetic levi- propulsion system [1]. Linear motors have the capability to tation; linear induction motor; linear motor; linear synchronous produce a direct thrust without any conversion of rota- motor; long stator; short stator; transportation sector tional energy into translational energy. This is a major advantage for transportation systems, because the thrust is I. HISTORY independent of the adhesion factor between wheel and The history of the linear motor can be traced back at least as rail. On the other hand, linear motors excite a normal far as the early 1840s, to the work of Charles Wheatstone in (orthogonal) force (Fy or Fz), which can be used to support Great Britain. In 1889, the Americans Schuyler S.
    [Show full text]
  • Robust Linear and Non-Linear Control of Magnetically Levitated Systems
    Robust linear and non-linear control of magnetically levitated systems Thesis Submitted to The University of Wales for The Degree of Doctor of Philosophy Alexandre Nikolov Pechev Institute of Magnetics, Electronics and Electrical Systems School of Engineering Cardiff University September, 2004 UMI Number: U584675 All rights reserved INFORMATION TO ALL USERS The quality of this reproduction is dependent upon the quality of the copy submitted. In the unlikely event that the author did not send a complete manuscript and there are missing pages, these will be noted. Also, if material had to be removed, a note will indicate the deletion. Dissertation Publishing UMI U584675 Published by ProQuest LLC 2013. Copyright in the Dissertation held by the Author. Microform Edition © ProQuest LLC. All rights reserved. This work is protected against unauthorized copying under Title 17, United States Code. ProQuest LLC 789 East Eisenhower Parkway P.O. Box 1346 Ann Arbor, Ml 48106-1346 Declaration This work has not previously been accepted in substance for any degree and is not being concurrently submitted in candidature for any degree. Signed (c;12 '' ’ate) D ate........ This thesis is the result of my own investigations, except where otherwise stated. Other sources are acknowledged bv footnotes giving explicit references. A bibliography is appended. Signei Date I hereby give consent for my thesis, if accepted, to be available for photocopying and for inter-library loan, and for the title and summary to be made available to outside organisa­ tions. Signed Date Acknowledgements I would like* to express my gratitude to Professor P.K. Sinha, Emeritus Professor at the University of Heading, for his financial and academic support during the course of this work.
    [Show full text]
  • Maglev (Transport) 1 Maglev (Transport)
    Maglev (transport) 1 Maglev (transport) Maglev, or magnetic levitation, is a system of transportation that suspends, guides and propels vehicles, predominantly trains, using magnetic levitation from a very large number of magnets for lift and propulsion. This method has the potential to be faster, quieter and smoother than wheeled mass transit systems. The power needed for levitation is usually not a particularly large percentage of the overall consumption; most of the power used is needed to overcome air drag, as with any other high speed train. The highest recorded speed of a Maglev train is 581 kilometres per JR-Maglev at Yamanashi, Japan test track in hour (361 mph), achieved in Japan in 2003, 6 kilometres per hour November, 2005. 581 km/h. Guinness World (3.7 mph) faster than the conventional TGV speed record. Records authorization. The first commercial Maglev "people-mover" was officially opened in 1984 in Birmingham, England. It operated on an elevated 600-metre (2000 ft) section of monorail track between Birmingham International Airport and Birmingham International railway station, running at speeds up to 42 km/h (26 mph); the system was eventually closed in 1995 due to reliability and design problems. Perhaps the most well known implementation of high-speed maglev technology currently operating commercially is the IOS (initial operating segment) demonstration line of the German-built Transrapid Transrapid 09 at the Emsland test facility in train in Shanghai, China that transports people 30 km (18.6 miles) to Germany the airport in just 7 minutes 20 seconds, achieving a top speed of 431 km/h (268 mph), averaging 250 km/h (160 mph).
    [Show full text]
  • Avrasya Sosyal Ve Ekonomi Araştırmaları Dergisi (ASEAD) Eurasian Journal of Researches in Social and Economics (EJRSE) ISSN:2148-9963
    Avrasya Sosyal ve Ekonomi Araştırmaları Dergisi (ASEAD) Eurasian Journal of Researches in Social and Economics (EJRSE) ISSN:2148-9963 www.asead.com EVALUATING A NEW FUTURE IN LOGISTICS WITH MAGNETIC LEVITATION1 Armin ARAS 2 Doç. Dr. Erkut AKKARTAL 3 ABSTRACT The transportation sector has been generally acknowledged as the most important sector in developing countries. In recent decades, mankind has striven to find a better way for cheap energy and fuel that will not harm motherland and the future of new generations. There are many who support green logistics and there are many who have found the solution in hybrid and electric vehicles. On the other hand, there are people who think outside of the box and search for the best solution. Use of MagLev (Magnetic Levitation) would be a wise and long- term profitable solution for environmental problems. Using Maglev in civil transportation is not a dream anymore, but using it in logistics would be as effective as civil transportation. With its high speed, it would be an amazing surplus for logistics timing. Maglev is being used in Japan as a prototype for the railroad sector and there are some small tech-businesses, which use MagLev to float some small objects like lamps and other decoration stuff. Maglev Trains are trains produced by applying simple magnet applications between train and rail. One of the two magnets, which are suitably placed one after the other, can stand in the air without touching the other with the effect of magnetic repulsion forces. The same principle is that the Maglev train hangs on rails.
    [Show full text]
  • Linear Induction Motor (LIM) for Hyperloop Pod Prototypes
    Research Collection Master Thesis Linear Induction Motor (LIM) for Hyperloop Pod Prototypes Author(s): Timperio, Christopher Publication Date: 2018-07 Permanent Link: https://doi.org/10.3929/ethz-b-000379531 Rights / License: In Copyright - Non-Commercial Use Permitted This page was generated automatically upon download from the ETH Zurich Research Collection. For more information please consult the Terms of use. ETH Library Linear Induction Motor (LIM) for Hyperloop Pod Prototypes MASTER THESIS In collaboration with: Presented by: Christopher Louis Timperio Supervised by: Prof. Dr. Jasmin Smajic Prof. Dr. Juerg Leuthold July 2018 Institute of Electromagnetic Fields (IEF) This page is intentionally left blank. Institute of Electromagnetic Fields (IEF) LINEAR INDUCTION MOTOR (LIM) FOR HYPERLOOP POD PROTOTYPES A thesis submitted to attain the degree of MASTER OF SCIENCE of ETH ZÜRICH (MSc ETH Zürich) presented by CHRISTOPHER LOUIS TIMPERIO BSc ECE, Georgia Institute of Technology born on 17.12.1990 United States of America accepted on the recommendation of Prof. Dr. Jasmin Smajic, examiner Prof. Dr. Juerg Leuthold, co-examiner July 2018 Institute of Electromagnetic Fields (IEF) This page is intentionally left blank. Institute of Electromagnetic Fields (IEF) Declaration of originality The signed declaration of originality is a component of every semester paper, Bachelor’s thesis, Master’s thesis and any other degree paper undertaken during the course of studies, including the respective electronic versions. Lecturers may also require a declaration of originality for other written papers compiled for their courses. I hereby confirm that I am the sole author of the written work here enclosed and that I have compiled it in my own words.
    [Show full text]
  • Linear Motor-Powered Transportation
    INVITED PAPER Linear Motor-Powered Transportation: History, Present Status, and Future Outlook This review explains the operation of various types of linear motors used in maglev systems, discusses and compares their suitability, and describes the scope of worldwide maglev developments. By Rolf Hellinger and Peter Mnich ABSTRACT | An outline of the different fields of application for II. REASONS FOR LINEAR linear motors in transportation is given. The different types of MOTOR APPLICATION IN linear motors are described and compared. The current status TRANSPORTATION SYSTEMS of the different linear motors used in the transportation sector Fresh impetus for worldwide research into linear motor- is analyzed. Finally, a look at worldwide activities and future powered transportation systems came from high-speed prospects is presented. maglev systems, on account of the need to develop not only a contactless levitation system but also a contact-free KEYWORDS | Electrodynamic levitation; electromagnetic levi- propulsion system [1]. Linear motors have the capability to tation; linear induction motor; linear motor; linear synchronous produce a direct thrust without any conversion of rota- motor; long stator; short stator; transportation sector tional energy into translational energy. This is a major advantage for transportation systems, because the thrust is I. HISTORY independent of the adhesion factor between wheel and The history of the linear motor can be traced back at least as rail. On the other hand, linear motors excite a normal far as the early 1840s, to the work of Charles Wheatstone in (orthogonal) force (Fy or Fz), which can be used to support Great Britain. In 1889, the Americans Schuyler S.
    [Show full text]