• Title, Summary, Keyword: Magnetic levitation

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Orientation and thickness dependence of magnetic levitation force and trapped magnetic field of single grain YBa2Cu3O7-y bulk superconductors

  • Jung, Y.;Go, S.J.;Joo, H.T.;Lee, Y.J.;Park, S.D.;Jun, B.H.;Kim, C.J.
    • Progress in Superconductivity and Cryogenics
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    • v.19 no.1
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    • pp.30-35
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    • 2017
  • The effects of the crystallographic orientation and sample thickness on the magnetic levitation forces (F) and trapped magnetic field (B) of single grain YBCO bulk superconductors were examined. Single grain YBCO samples with a (001), (110) or (100) surface were used as the test samples. The samples used for the force-distance (F-d) measurement were cooled at 77 K without a magnetic field (zero field cooling, ZFC), whereas the samples used for the B measurement were cooled under the external magnetic field of a Nd-B-Fe permanent magnet (field cooling, FC). It was found that F and B of the (001) surface were higher than those of the (110) or (100) surface, which is attributed to the higher critical current density ($J_c$) of the (001) surface. For the (001) samples with t=5-18 mm, the maximum magnetic levitation forces ($F_{max}s$) of the ZFC samples were larger than 40 N. About 80% of the applied magnetic field was trapped in the FC samples. However, the F and B decreased rapidly as t decreased below 5 mm. There exists a critical sample thickness (t=5 mm for the experimental condition of this study) for maintaining the large levitation/trapping properties, which is dependent on the material properties and magnitude of the external magnetic fields.

Magnetic levitation control by attractive force compensation

  • Jeong, Nam-Soo;Kim, Sang-Bong
    • 제어로봇시스템학회:학술대회논문집
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    • pp.355-359
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    • 1992
  • This paper presents a procedure to design a real time control system for a magnetic levitation system based on the state space approach by adopting a control method compensating attractive force according to load variation of maglev vehicle. Also the paper has realized a robust control algorithm for the change of self-inductance parameters and the disturbance such as the change of mass of Maglev vehicles. The theoretical results are applied to the gap control problems of an attractive-type-magnetic levitation system and the effectiveness is proved by the implementation of digital control using 16 bits microcomputer.

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Controller design of sensorless magnetic levitation system by 2-degree-of-freedom method (2자유도 기법에 의한 센서리스 자기 부상계의 제어기 설계)

  • 김창화;정해종;양주호
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.426-431
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    • 1997
  • In this paper, a sensorless realization method is proposed for the magnetic levitation system. Also we design the robust servo controller which based on the two degree-of-freedom-control theory and H$\sub$.inf./ control theory for the system. From time responses, we confirm that the proposed sensorless method can be applied the magnetic levitation system. Also the designed controller has the good disturbance rejection and the reference tracking performance.

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Magnetic Levitation Control Using The Parallel Fuzzy Controller (병렬 퍼지-PID 제어기를 이용한 자기부상 제어)

  • Kim, Myoung-Gun;Kim, Jong-Moon;Choi, Young-Kiu
    • Proceedings of the KIEE Conference
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    • pp.352-354
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    • 2004
  • In this paper, a parallel fuzzy controller for one degree of freedom magnetic levitation is designed and its performance is compared with the performance of a PID controller. Input, output scaling factor of fuzzy controller and gain of PID controller were tuned using the GA algorithm. The designed controllers are validated by numerical simulations. So it's shown that parallel fuzzy controller can give the better performance for the plant than PID controller.

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Linear Induction Motor for Magnetic Levitation Vehicle (자기부상열차용 선형 유도전동기)

  • Kim Jeong-Cheol;Park Yeong-Ho;Kim Dae-Kwang;Choi Jong-Mook
    • Proceedings of the KSR Conference
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    • pp.220-224
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    • 2005
  • EMU(Electric Multiple Unit) operated in local area is mostly consist of moving system on the rail and the traction motor drives the gear and wheel with the mechanical propulsion force. Most of countries are interested in Magnetic Levitation Vehicle for the transportation system on next generation and they have been studying about it continuously. Thus this paper is studied the Linear Induction Motor as the propulsion equipment of Magnetic Levitation Vehicle

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Magnetic levitation characteristics of hybrid magnets according to the initial air gap length (자기부상용 하이브리드 전자석의 초기 공극 변화에 따른 특성 고찰)

  • Oh, Hyang-Jae;Kim, Kyung-Min;Park, Seung-Chan
    • Proceedings of the KIEE Conference
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    • pp.647-648
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    • 2006
  • In this paper, magnetic levitation characteristics of hybrid magnets are experimentally shown under the newly proposed airgap condition. The digital PID controller is utilized to control the airgap of the magnetic levitation system.

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$H_ {\infty}$ PID Controller Design for an Attraction Type Magnetic Levitation System (흡인식 자기부상시스템의 $H_ {\infty}$ PID 제어기 설계)

  • Kim, Seog-Joo;Kim, Chun-Kyung;Kwon, Soon-Man
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.9
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    • pp.1624-1627
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    • 2008
  • This paper deals with a linear matrix inequality (LMI) approach to the design of a PID controller for an attraction type magnetic levitation system. First, we convert the $H_ {\infty}$ PID controller problem into a static output feedback problem. We then solve the static output problem by using the recently developed penalty function method. Numerical experiments show the effectiveness of the proposed algorithm.

Air-gap Disturbance Attenuation of Magnetic Levitation Systems using Discrete Kalman Filter (이산형 칼만필터를 이용한 자기부상시스템의 공극외란 감쇄)

  • 성호경;정병수;장석명
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.53 no.7
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    • pp.444-451
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    • 2004
  • Conventional magnetic levitation systems could show unsatisfactory performance under air-gap disturbance due to rail irregularities. In this paper, we propose a feedback control system with discrete Kalman filter for air-gap disturbance attenuation. It is shown that excellent system performance can be obtained with the use of discrete Kalman filter, and that results from experiments agree well with those of simulations.

A modeling of the magnetic levitation stage and its control

  • Nam, Taek-Kun;Kim, Yong-Joo;Jeon, Jeong-Woo;Lee, Ki-Chang
    • 제어로봇시스템학회:학술대회논문집
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    • pp.1082-1087
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    • 2003
  • In this paper, we address the development of magnetic levitation positioning system. This planar magnetic levitator employs four permanent magnet liner motors. Each motor generates vertical force for suspension against gravity, as well as horizontal force for drive levitation object called a platen This stage can generate six degrees of freedom motion by the vertical and horizontal force. We derived the mechanical dynamics equation using lagrangian method and used coenergy to express an electromagnetic force. We proposed control algorithm for the position and posture control from its initial value to its desired value using sliding mode control. Some simulation result is provided to verify the effectiveness of the proposed control scheme.

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Characteristic Analysis of LIM for Magnetic Levitation Vehicle by F.E.M. (FEM을 이용한 자기부상 열차용 선형 유도전동기의 특성 해석)

  • Kim Jeong-Cheol;Lee Sang-Woo;Yoon Jong-Hack;choi Jong-Mook
    • Proceedings of the KSR Conference
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    • pp.433-438
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    • 2003
  • The recent operating trains including the high speed train are mostly moving system on the rail and system use the mechanical propulsion force to drive the gear and wheel by the traction motor. Advanced countries are interested in Magnetic Levitation Vehicle and they have been studying about it continuously. Thus this paper is analyzed the feature of analysis the feature for Linear Induction Motor as the propulsion equipment of Magnetic Levitation Vehicle. And the Magnetic Levitation Vehicle is being developed for the transportation system of next generation using the Finite Element Method

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