• Title, Summary, Keyword: Magnetic levitation

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A Study on the Levitation Mechanism Based on the Electrodynamic Force for a Maglev Planar Transportation System (동전기력에 기초한 자기 부상 평면 운송 시스템의 부상 메커니즘에 관한 연구)

  • Park, Joon-Hyuk;Baek, Yoon-Su
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.30 no.9
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    • pp.1025-1033
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    • 2006
  • This paper describes the levitation mechanism using magnetic wheel for a maglev planar transportation system. Rotation of the magnetic wheel where the permanent magnet array is embedded produces the time varying traveling magnetic flux density and the generated magnetic flux density creates the induced levitation force and drag force with the conductor. Because the net drag force is zero, magnetic wheel can only generate the levitation force. Thus, it always guarantees the stability in levitation direction and it does not disturb other directional motion. In this paper, levitation principle of the magnetic wheel is analyzed using distributed field approach and dynamic characteristics of the levitation in the magnetic wheel system are estimated. The feasibility of the proposed levitation mechanism is verified through the several experimental works.

Magnetic Levitation System of High Tc Superconductor (초전도 자기부상 시스템)

  • Lee, Sang-Heon
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.55 no.4
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    • pp.213-216
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    • 2006
  • The magnetic levitation effect a high Tc superconductor beneath the toroidal permanent magnet was examined by means of a improved magnetic seesaw method. Magnetic effects associated with penetration and pinning in superconductor. One of these was focussing of magnetic field by superconductor and the other was magnetic levitation. The existence of equilibrium was shown to be related to hysteresis observed in the force separation for a toroidal permanent magnet and superconductor. Obtained results indicate that magnetic levitation effect in the present case was mainly due to diamagnetic effect.

Development of Levitation Control for High Accuracy Magnetic Levitation Transport System (초정밀 자기부상 이송장치의 부상제어기 개발)

  • Ha, Chang-Wan;Kim, Chang-Hyun;Lim, Jaewon
    • Journal of Institute of Control, Robotics and Systems
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    • v.22 no.7
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    • pp.557-561
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    • 2016
  • Recently, in the manufacturing process of flat panel displays, mass production methods of inline system has been emerged. In particular the next generation OLED display manufacturing process, horizontal inline evaporation process has been tried. It is important for the success of OLED inline evaporation process to develop a magnetic levitation transport system capable of transferring a carrier equipped with a mother glass with high accuracy without any physical contact along the rail under vacuum condition. In the case of existing wheel-based transfer system, it is not suitable for OLED evaporation process requiring high cleanliness. On the other hand, the magnetic levitation transport system has an advantage that it does not generate any dust and it is possible to achieve high-precision control because there are not non-linear factors such as friction force. In this paper, we introduce the high-precision magnetic levitation transport system, which is currently under development, for OLED evaporation process.

Analysis on the Levitation Force Characteristics of Longitudinal Flux Type Levitation Magnet using Equivalent Magnetic Circuit Model (등가자기회로 모델을 이용한 종자속형 자기부상 전자석의 부상력 특성 해석)

  • Cho, Han-Wook;Kim, Chang-Hyun;Lee, Jong-Min;Han, Hyung-Suk
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.12
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    • pp.2236-2245
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    • 2011
  • This paper deals with the levitation force characteristics of electromagnet for MAGLEV vehicle application. The magnetic flux density distribution and levitation force characteristics of the electromagnet are investigated by means of equivalent magnetic circuit model. Firstly, we defined the aligned and unaligned electromagnet module for the full-electromagnet, and magnetic flux paths are represented for each model including leakage and fringing flux paths. Because of the analysis model contains both the permanent magnet and electromagnet coil, we calculated the airgap magnetic flux density and levitation forces using flux superposition in electromagnetic circuit. The results are validated extensively by comparison with finite element analysis. Moreover, the 1/4 scaled magnetic levitation and propulsion test vehicle has been manufactured and tested in order to verify these predictions. The experimental results confirms the validity of the analytical prediction with equivalent magnetic circuit model for the description of a electromagnet.

Design of Hybrid Type Levitation and Propulsion System for High-Speed Maglev (초고속 자기부상열차를 위한 하이브리드형 부상 추진 시스템 설계)

  • Cho, Han-Wook;Han, Hyung-Suk;Lee, Jong-Min;Kim, Bong-Sup;Rho, Kyu-Suk;Kim, Dong-Sung
    • Proceedings of the KIEE Conference
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    • pp.94-96
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    • 2009
  • This paper deals with the design considerations of electro-magnet (EM)-permanent magnet (PM) hybrid levitation and propulsion device for magnetically levitated (maglev) vehicles. Several design considerations such as machine structure, manufacturing, and control strategy are described. In order to verify the design scheme and feasibility of control strategy, dynamic test set is implemented and tested.

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The requirements of passive levitation for nonmagnetic body in magnetic fluid (자성유체 내에서 비자성체의 수동적 부양 조건)

  • Jeon, Sang-Hyeon;Nam, Yun-Joo;Park, Myeong-Kwan
    • Proceedings of the KSME Conference
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    • pp.974-978
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    • 2007
  • In this paper, the requirements of passive levitation for nonmagnetic body in magnetic fluid are investigated. The passive levitation system includes the electromagnetic system composed of two hollow solenoids, the magnetic fluid and the nonmagnetic body made of aluminum. The hollow solenoids generate nonuniform magnetic fields, leading to the gradient of the magnetic field in magnetic fluid. Hence, the resultant magnetic body force in magnetic fluid is used to levitate the nonmagnetic body in the opposite direction of the gravitation. The levitation conditions according to applied current and the mass of the nonmagnetic body are obtained analytically.

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Behavior of Concrete Track Girder for Magnetic Levitation Train (자기부상열차구조물에 있어서 콘크리트선로거더의 거동)

  • Kang Bo-Soon
    • Proceedings of the KSR Conference
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    • pp.686-691
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    • 2005
  • State of the art and current issues related with the RC and PSC structure system for the magnetic levitation train were investigated. The German and China magnetic levitation train adopted a new kind of a structure to enable high-speed transportation, which allows the use of the space over a ground. The loading from magnetic levitation trains is light-weight compared with a regular train due to load distribution to a supporting structure. Therefore, the magnetic levitation train is considered an economical and efficient transportation system, and is also an environmentally-sustainable structure. In this paper, the structural design and construction technology specific to a magnetic levitation train were discussed, and structural considerations related with an actual operation of the train were pointed out. In addition, the future research area of a magnetic levitation train was proposed

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A Study on the Sensorless Realization of Magnetic Levitation System (자기 부상계의 센서리스 실현에 관한 연구)

  • 김창화;정병건;양주호
    • Journal of KSNVE
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    • v.8 no.1
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    • pp.195-203
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    • 1998
  • The magnetic levitation system is utilized in the magnetic bearing of high-speed rotor because of little friction, no lubrication, no noise and so on. The magnetic levitation system need the feedback controller for the stabilization of system, and gap sensors are generally used to measure the gap. The use of sensor easily goes into troublesome caused by sensor failure discord between the measurement point and the control point etc. This paper presents the design of robust stabilizing contoller by $H_{\infty}$ control theory using the sensorless method proposed by authors in the magnetic levitation system. And we investigated both the validity of the designed controller and the usefulness of the sensorless magnetic levitation system through results of actual experiment.

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An Analytical Study on the Magnetic Levitation System Using a Halbach Magnet Array (Halbach 배열 영구자석을 이용한 자기 부상계의 해석에 관한 연구)

  • Moon, Seok-Jun;Yun, Dong-Won;Cho, Hung-Je;Park, Sung-Whan;Kim, Byung-Hyun
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.17 no.11
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    • pp.1077-1085
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    • 2007
  • Typically, three types of levitation technologies are applied to magnetic levitation systems: electromagnetic suspension, electrodynamic suspension, and hybrid electromagnetic suspension. A Halbach array is a special arrangement of permanent magnets which augments the magnetic field on one side of the device while cancelling the field to near zero on the other side. The application of this Halbach array magnet to the electrodynamic suspension has been recently studied in order to increase the levitation capability. This paper is focused on an analytical method of the magnetic levitation system using Halbach array magnet. The suitability of the proposed method is verified with comparing to the finite element method. In addition, dynamic stability of the magnetic levitation system is discussed. From this study, it is confirmed that the proposed method provides a reasonable solution with less computation time compared to the finite element method and the magnetic levitation system using Halbach array magnet is stable dynamically.

A Study on the Design of Robust Simulation Controller of Magnetic Levitation System(I) (자기부상 시스템의 강인한 제어기 설계에 관한 연구(I) -시뮬레이션을 중심으로-)

  • 양주호;김창화;정석권;김영복
    • Journal of Advanced Marine Engineering and Technology
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    • v.19 no.3
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    • pp.84-90
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    • 1995
  • The magnetic levitation system has great advantages, such as little friction, no lubrication no noise and so on. The magnetic levitation system need a stabilizing controller because it is a unstable system in natural. This paper presents the robust stabilizing controller design of the magnetic levitation system. The controller which is designed in this paper by $H_{infty}$ control theory is robust servo controller which has zero offset in spite of the model uncertainties. The validity of controller was investigater through the response simulation. In the future, we will use the result of this study at the actual magnetic levitation system.

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