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Über dieses Buch

This book provides a comprehensive overview of magnetic levitation (Maglev) technologies, from fundamental principles through to the state-of-the-art, and describes applications both realised and under development.

It includes a history of Maglev science and technology showing the various milestones in its advancement. The core concepts, operating principles and main challenges of Maglev applications attempted across various fields are introduced and discussed. The principle difficulties encountered when applying Maglev technology to different systems, namely air gap control and stabilization, are addressed in detail. The book describes how major advancements in linear motor and magnet technologies have enabled the development of the linear-motor-powered Maglev train, which has a high speed advantage over conventional wheeled trains and has the potential to reach speed levels achieved by aircraft. However, many expect that Maglev technology to be a green technology that is applied not only in rail transportation, but also in diverse other fields; to ensure clean transfer in LCD manufacturing, in ropeless high speed elevators, small capacity rail transportation, space vehicle launchers, missile testers, energy storage, and so on. These potential applications and their unique challenges and proposed technological solutions are introduced and discussed in depth.

The book will provide readers from academia, research institutes and industry with insights on where and how to apply Maglev technology, and will serve as a guide to the realization of their Maglev applications.



Chapter 1. Introduction

This chapter is an introduction for this monograph. The background, application, and potential of magnetic levitation in various areas are first given with operating or developing systems. The trend of the technology is discussed, and the layout and contents of the book are briefly summarized.
Hyung-Suk Han, Dong-Sung Kim

Chapter 2. Fundamentals

The design and implementation of maglev systems fundamentally involves the interdisciplinary concepts of electromagnetism, electronics, mechanical engineering, measurement and control. In consideration of this, the fundamentals of such disciplines are summarized to help the reader understand the remaining chapters with ease.
Hyung-Suk Han, Dong-Sung Kim

Chapter 3. Permanent Magnet

The principles of levitation and operation using the familiar permanent magnet are introduced here, with corresponding applications. The attractive and repulsive forces between two bodies are provided both in static and dynamic modes. One of the main advantages of this type is that there is no need for levitation control . On the other hand, low damping may be a limitation. With the development of high-strength permanent magnets, this maglev system may have the potential for applications in passenger transport and in factory automation systems. In particular, a Halbach array may offer viable maglev systems in various areas.
Hyung-Suk Han, Dong-Sung Kim

Chapter 4. Superconducting Magnet

Levitation using superconducting magnets has come a long way since Arkadiev’s experiment in the early 1940s, resulting in the superconducting maglev system L0 series for the route between Tokyo and Osaka at 505 km/h. Recently, several prototypes were built to transfer semiconductors using superconducting magnets in a clean environment. With advances in high-temperature superconducting materials with more manageable proportions, this type of levitation is becoming worthy of further consideration. The three methods for levitation, based on diamagnetism, flux pinning effects and inductive systems, are outlined with their respectively associated applications.
Hyung-Suk Han, Dong-Sung Kim

Chapter 5. Electromagnet

Of the types of magnetic levitation systems proposed, electromagnetic attraction systems are currently the most widely used in various applications. As such, most of the research on magnetic levitation has been focused in this area. An electromagnet simply consists of a ferromagnetic core, such as steel, and a current-carrying winding wound on the core. While the manufacturing and operation of the magnet is relatively easy, a sophisticated feedback control system needs to be incorporated to maintain a constant separation between the pole face of the magnet and the ferromagnetic reaction surface. This control requirement is the disadvantage over the permanent and superconducting systems. Although interdisciplinary research is needed to achieve stabilization, the motion controllability of the electromagnetic systems would be a primary advantage, even for high precision applications. This chapter presents the basis for the design, analysis and implementation of the electromagnetic systems. The performance requirements, design considerations, magnet design procedure, control scheme, control and measurement and electronics are briefly introduced. Though the applications of the electromagnet are focused on vehicles, the topics covered in the chapter are highly transferrable to other applications, without any additional effort.
Hyung-Suk Han, Dong-Sung Kim

Chapter 6. Railway Applications

Maglev technology has evolved most significantly in the area of railway passenger transport due to its original emergence as an alternative to wheel-on-rail systems in the mid-1960s. Its development resulted in the construction of a number of systems currently in service and under construction. While there is a wide range of such systems, only commercial and operational systems are dealt with in this text, as the author has the aim of highlighting the practical aspects. In addition, systems that may have a long history are presented briefly as they have already been extensively covered in the literature or on the Internet.
Hyung-Suk Han, Dong-Sung Kim

Chapter 7. Applications

Recently, there have been some attempts to apply magnetic levitation technology in areas where contactless operation is a prime design consideration. Magnetic conveyors, elevators and rides are examples of such applications. In addition, the use of the subsystems of the maglev systems, i.e. linear motors or magnets, is also being proposed, particularly in areas such as transportation, defense and aerospace. This chapter introduces such newly proposed attempts with a view to highlighting the use of magnetic levitation in those applications. It is hoped that this chapter may help the reader imagine their own new applications.
Hyung-Suk Han, Dong-Sung Kim


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