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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. Parts excepted are corrections of form and content by the supervisor. Title of work (in block letters): Authored by (in block letters): For papers written by groups the names of all authors are required. Name(s): First name(s): With my signature I confirm that − I have committed none of the forms of plagiarism described in the ‘Citation etiquette’ information sheet. − I have documented all methods, data and processes truthfully. − I have not manipulated any data. − I have mentioned all persons who were significant facilitators of the work. I am aware that the work may be screened electronically for plagiarism. Place, date Signature(s): For papers written by groups the names of all authors are required. Their signatures collectively guarantee the entire content of the written paper. This page is intentionally left blank. Institute of Electromagnetic Fields (IEF) Table of Contents Table of Contents Table of Contents ........................................................................................................................ 7 Abstract ...................................................................................................................................... 9 1 Introduction ...................................................................................................................... 10 1.1 Project Background – The Hyperloop Concept ..................................................................... 13 1.2 Project Motivation ................................................................................................................ 15 1.3 State of the Art ...................................................................................................................... 17 1.3.1 EPFL and SwissMetro .................................................................................................... 18 1.3.2 Virgin Hyperloop One .................................................................................................... 19 1.3.3 Tracked Hovertrain ....................................................................................................... 21 1.3.4 Small Precision Linear Induction Motors ...................................................................... 23 2 Theory ............................................................................................................................... 24 2.1 Maxwell’s Equations ............................................................................................................. 24 2.1.1 Quasi-Static Approximation .......................................................................................... 25 2.2 Electric Drives ........................................................................................................................ 26 2.2.1 Motor Basics ................................................................................................................. 26 2.2.2 Linear Motor Evolution ................................................................................................. 28 2.2.3 Polyphase Excitation ..................................................................................................... 31 2.2.4 Travelling Stator Field ................................................................................................... 34 2.2.5 Synchronous Speed ....................................................................................................... 38 2.2.6 Poles and Pole Pitch ...................................................................................................... 39 2.2.7 Slip ................................................................................................................................. 40 2.2.8 Power Factor ................................................................................................................. 42 2.2.9 Slot and Winding Distribution ....................................................................................... 44 2.3 Magnetic Flux Density ........................................................................................................... 46 2.3.1 Magnetic Saturation...................................................................................................... 46 2.3.2 Magnetomotive Force ................................................................................................... 50 2.3.3 Reluctance and the Magnetic Circuit ............................................................................ 51 2.4 Faraday’s Law of Induction ................................................................................................... 53 2.4.1 Eddy Currents ................................................................................................................ 54 2.4.2 Induced Stator Voltage ................................................................................................. 55 2.5 Lorentz Force ........................................................................................................................ 56 2.6 End-Effects ............................................................................................................................ 62 2.7 Paschen’s Law ....................................................................................................................... 63 3 Design ................................................................................................................................ 69 3.1 Motor Configuration ............................................................................................................. 70 3.2 Driving Thrust ........................................................................................................................ 72 3.2.1 Predicted Trajectory Profile .......................................................................................... 72 3.3 Motor Design ........................................................................................................................ 75 3.3.1 Primary – Stator Iron Core ............................................................................................ 80 3.3.2 Primary – Stator Windings ............................................................................................ 84 3.3.3 Secondary – Aluminum I-Beam ..................................................................................... 90 3.3.4 Air Gap .......................................................................................................................... 93 ETH Zurich 7 Christopher Timperio Table of Contents 3.4 Final Model ........................................................................................................................... 95 3.5 Electrical Design .................................................................................................................... 98 3.5.1 Power ............................................................................................................................ 98 3.5.2 Batteries ...................................................................................................................... 103 3.5.3 Inverters ...................................................................................................................... 108 3.6 Motor Fabrication ............................................................................................................... 113 3.7 Temperature Considerations .............................................................................................. 116 4 Results ............................................................................................................................. 118 4.1 Double-Sided 24 Slot 2-Pole LIM........................................................................................
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