2024 Faculty Courses School of Engineering Department of Electrical and Electronic Engineering Graduate major in Electrical and Electronic Engineering
Magnetic Levitation and Magnetic Suspension
- Academic unit or major
- Graduate major in Electrical and Electronic Engineering
- Instructor(s)
- Ei Tokioka / Rumi Watanabe / Akira Chiba / Kyohei Kiyota / Yukio Tsutsui
- Class Format
- Lecture (Face-to-face)
- Media-enhanced courses
- -
- Day of week/Period
(Classrooms) - 3-4 Mon / 3-4 Thu
- Class
- -
- Course Code
- EEE.P501
- Number of credits
- 200
- Course offered
- 2024
- Offered quarter
- 3Q
- Syllabus updated
- Mar 14, 2025
- Language
- English
Syllabus
Course overview and goals
At the era of the 21 century, magnetic levitation and suspension have been introduced into some practical applications. There are maglevs such as the JR Yamanashi Maglev, the Linimo train in Nagoya, and the Shanghai Maglev. On the other hand, bearingless motor water pumps for pure water, magnetic bearings for turbo molecular pumps are used in semiconductor processes. In this lecture, we will study about super conductor magnetic levitation, Maglev train systems, magnetic bearings, and bearingless motors.
Course description and aims
Students learn materials for magnetic suspensions and levitations such as super conductors, permanent magnets, electro magnets, etc.
They also learn magnetic circuit analysis, principles and examples of electro dynamic magnetic levitation, super conductor bulk magnetic levitation, eddy current type magnetic levitation, electro-magnet type magnetic levitation.
They learn MAGLEV trains, magnetic bearings and bearingless motors.
Student learning outcomes
実務経験と講義内容との関連 (又は実践的教育内容)
lecturer B has a wealth of practical experience as he has been responsible for the research and development of electrical equipment for a long time at a company. Regarding superconductivity, he conducted research on electromagnetic generators using metallic superconductors between his undergraduate and master's degrees. In addition, in his work on magnetic levitation using high-temperature superconductors, he discovered that soft magnetic materials could be magnetically suspended without any control while studying the magnetic properties of high-temperature superconductors in detail. As a result of these achievements, he obtained a Dr. Eng.
Keywords
Maglev, magnetic suspension, magnetic levitation, magnetic bearing, bearingless motor, superconductor
Competencies
- Specialist skills
- Intercultural skills
- Communication skills
- Critical thinking skills
- Practical and/or problem-solving skills
Class flow
Over view, demonstration of magnetic suspension or video, lecture, quiz and report.
Course schedule/Objectives
| Course schedule | Objectives | |
|---|---|---|
| Class 1 | Syllabus distribution, Purposes , contents of this lecture. Evaluation methods and office hours are presented. Exam account | Introduction to magnetic bearing and bearingless motor. Demonstration of magnetic suspension. |
| Class 2 | Application of bearingless motors | Based on the text book, chapter 21, some applications of bearingless motors are presented. Why these applications need magnetic suspension? How effective magnetic suspension? Demonstration of magnetic suspension is included. |
| Class 3 | Analysis of magnetic circuits. | Simple magnetic circuits, analysis, electro magnetic force, non linearity, flux density reluctance, MMF, flux linkage. |
| Class 4 | Analysis of permanent magnet circuits | BH curves, various kinds of permanent magnets, equivalent representation, magnetic circuit analysis, attractive force. |
| Class 5 | Fundamentals of superconductivit | Contents：Types and characteristics of superconductors, Persistent current, meissner effect, pinning effect, magnetic levitation of permanent magnet. |
| Class 6 | Magnetic levitation of soft magnetic materials using superconductors | Contents：Difference between the superconductor and the permanent magnet, electromagnetic force acting on soft magnetic material, magnetic levitation of soft magnetic material, other magnetic levitation. |
| Class 7 | Yamanashi Maglev systems | Structure, super conductor coils, propulsion, levitation coils, test ride video, picture, construction, latest news. |
| Class 8 | Radial magnetic bearing | Structure and principle of radial magnetic bearing, current, MMF, magnetic circuit, magnetic force analysis |
| Class 9 | Simple representation of magnetic bearing | Force and current relationship, linearization, displacement-force factor, block diagram of radial magnetic bearing, stable controller design |
| Class 10 | Controller requirement of magnetic bearing | Instability of magnetic suspension, feedback controller configuration and design |
| Class 11 | Controller parameter adjustments of magnetic bearing | Parameters and response, external force suppression and displacements, integral controller, synchronizing disturbance, radial direction error, unbalance |
| Class 12 | Power electronics, introduction of bearingless motors | |
| Class 13 | Linimo Maglev system | Structure, characteristics, history of Linimo, low speed magnetically levitated train. Propulsion, levitation, electromagnetic force generation, feedback control system. |
| Class 14 | Trans Rapid Maglev system | Structure, high speed train, propulsion, electric power supply, magnetic levitation, Shanghai maglev, video, status. Other maglev systems Miyazaki maglev system, structure, principle of propulsion, magnetic levitation, some other maglevs are introduced. (Final exam or Report) |
Study advice (preparation and review)
To enhance effective learning, students are encouraged to spend approximately 100 minutes preparing for class and another 100 minutes reviewing class content afterwards (including assignments) for each class.
They should do so by referring to textbooks and other course material.
Textbook(s)
Akira Chiba, Tadashi Fukao, Osamu Ichikawa, Masahide Oshima, Masatsugu Takemoto and David G. Dorrell, ``Magnetic Bearings and Bearingless Drives'', Newnes Elsevier, ISBN 0 7506 5727 8, 2005
Reference books, course materials, etc.
distributed
Evaluation methods and criteria
Report and presentation 100%, Negotiated at the first lecture
Those who have to absent from lectures, please submit two page summary of the lecture.
Related courses
- EEE.P301 ： Electric Machinery and apparatus
- EEE.P311 ： Power Electronics
Prerequisites
Fundamentals of Electric Machinery, Power Electronics should be learned.
Other
In this year, we will introduce e-learning with Net Exam. Please bring your smart phone, note pc, tablet, etc. The lecture improvements of undergraduate studies through Net Exam is described in the documents(Japanese) at the web site above. In this year we try to improve graduate school lecture. How we can realize active learning? Let us find a way.