• Title, Summary, Keyword: Magnetic levitation

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Development of Redundant Levitation and Guidance Control System of the Urban and Medium to High Speed Magnetic Levitation Train

  • Cho, Yeon-Hwa;Lee, Sun-Hee;Jang, Kyung-Hyun;Lee, Sang Suk;Lee, Kyoung-Bok;Park, Doh-Young
    • International Journal of Railway
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    • v.8 no.1
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    • pp.21-29
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    • 2015
  • This study focuses on the performance enhancement of the levitation and guidance control system in urban and medium-to high-speed magnetic levitation trains. A levitation control system, which is currently being tested in Yeongjongdo, is a single controller that is neither designed nor produced on the basis of redundancy. Hence, vehicular stability and reliability should be improved for the situation in which levitation failure occurs because of a breakdown in a controller during vehicle operation. In addition, the control system should be developed to control electromagnetic levitation considering changes in normal force according to changes in the driving force of the propulsion system.

Simulation of Repulsive Type Thrust Magnetic Bearing using Eddy Current (와전류를 이용한 반발식 추력 마그네틱 베어링의 시뮬레이션)

  • 유제환;임윤철;이상조
    • Tribology and Lubricants
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    • v.11 no.1
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    • pp.20-26
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    • 1995
  • Most magnetic bearings are based on the attractive force between the magnets and ferrous materials. One of the disadvantages of such attractive type magnetic bearings is the instability so that an active control device is necessary to operate bearing successfully. In this study a repulsive type magnetic bearing is analyzed which uses eddy current as a force source. The load capacities are analyzed for the various gap sizes, the rotor velocities and the frequencies of current supplied to electromagnet. Analytic Results show that as the gap size decreases, the levitation and drag forces increase, while the number of poles increasqs, the drag force decreases in the higher linear velocity region. Experimental results show that as the gap size decreases the levitation and the drag force increase, and as the velocity of rotor increases, the drag is larger than the levitation force up to certain velocity. But after that, the levitation is larger than the drag force. As the frequency of the current increases the levitation and drag decreases while the thickness of rotor gets thicker the forces decrease because of increase in eddy current loss.

Optimal Design of Magnetic Levitation Controller Using Advanced Teaching-Learning Based Optimization (개선된 수업-학습기반 최적화 알고리즘을 이용한 자기부상 제어기의 최적 설계)

  • Cho, Jae-Hoon;Kim, Yong-Tae
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.1
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    • pp.90-98
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    • 2015
  • In this paper, an advanced teaching-learning based optimization(TLBO) method for the magnetic levitation controller of Maglev transportation system is proposed to optimize the control performances. An attraction-type levitation system is intrinsically unstable and requires a delicate control. It is difficult to completely satisfy the desired performance through the methods using conventional methods and intelligent optimizations. In the paper, we use TLBO and clonal selection algorithm to choose the optimal control parameters for the magnetic levitation controller. To verify the proposed algorithm, we compare control performances of the proposed method with the genetic algorithm and the particle swarm optimization. The simulation results show that the proposed method is more effective than conventional methods.

Development of Magnetic Force Modeling Equipment for Magnetic Levitation Systems (자기부상시스템의 자기력 모델링 시스템 개발)

  • Yang, Ji-Hyuk;Kim, Seuk-Yun;Lee, Young-Sam;Kwon, Oh-Kyu
    • Journal of Institute of Control, Robotics and Systems
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    • v.17 no.4
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    • pp.321-327
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    • 2011
  • This paper proposes an equipment and an algorithm for modeling the magnetic force of electromagnets in magnetic levitation systems. We assume that the magnetic force model is represented in terms of a 2D lookup table. The 2D lookup table is constructed by applying noncausal filtering and interpolation to data measured by the proposed modeling equipment. The proposed modeling equipment is designed such that it can measure the magnetic force exerted on the levitation object while it changes the voltage applied to the electromagnet and position of the levitation object. The algorithm of making a 2D lookup table has two stages. The data measured by the proposed modeling equipment is smoothed by a noncausal filter and then the 2D lookup table is obtained by interpolating filtered data. The proposed modeling method has advantages of time-saving, model consistency, and chance of automation for mass production. We show the validity of proposed method through control experiments.

Output Improvement of a Magnetic Levitation Control System

  • Jung, Hae-Young;Na, Seung -You
    • Proceedings of the Korean Institute of Intelligent Systems Conference
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    • pp.59-70
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    • 1995
  • Output performance improvement using fuzzy logic to the conventional control scheme for a magnetic levitation system is presented in this paper, Adverse characteristics of nonlinearity, unstability, system parameter variation, etc, in the levitation system are partially overcome by the general fuzzy control action. Using a PD type compensator, a coarse framework of output performance is provided to the levitation system. Then a fine regulation to the output performance requirement is obtained by the natural description of the control action in the form of fuzzy logic controller. This control action soothes the adverse characteristics of the levitation system. In this way a better output performance can be obtained in a real time experiment.

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Characteritic Analysis of Hybrid Levitation and Propulsion System for Super-Speed Maglev (초고속 자기부상열차를 위한 하이브리드형 부상 추진 시스템의 특성 해석)

  • Cho, Han-Wook;Lee, Jong-Min;Han, Hyung-Suk
    • Proceedings of the KIEE Conference
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    • pp.623_624
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    • 2009
  • This paper deals with the characteristic analysis of electro-magnet (EM)-permanent magnet (PM) hybrid levitation and propulsion device for magnetically levitated (maglev) vehicles. Several machine characteristics such as levitation force with/without control current and thrust are described. In order to verify the analysis results and feasibility of high-speed operation of the maglev vehicle, real-scale static test set is implemented and tested.

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A Levitation Controller Design for a Magnetic Levitation System (자기부상 시스템의 부상제어기 설계)

  • 김종문;강도현;박민국;최영규
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.52 no.6
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    • pp.342-350
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    • 2003
  • In this paper, a levitation controller for a magnetic levitation(MagLev) system is designed and implemented. The target to be controlled is PEM(permanent and electromagnet) type with 4-corners levitation which is open-loop unstable, highly non-linear and time-varying system. The digital control system consists of a VME-based CPU board, AD board, PU board, 4-Quadrant chopper, and gap sensor, accelerometer as feedback sensors. In order to estimate the velocity of the magnet, we used 2nd-order state observer with acceleration and gap signal as input and output, respectively. Using the estimated states, a state feedback control law for the plant is designed and the feedback gains are selected by using the pole-placement method. The designed controller is experimentally validated by step-type gap reference change and force disturbance test.

Levitation and Thrust Forces Analysis of Hybrid-Excited Linear Synchronous Motor for Magnetically Levitated Vehicle

  • Cho, Han-Wook;Kim, Chang-Hyun;Han, Hyung-Suk;Lee, Jong-Min
    • Journal of Electrical Engineering and Technology
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    • v.7 no.4
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    • pp.564-569
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    • 2012
  • This paper proposes a hybrid-excited linear synchronous motor (LSM) that has potential applications in a magnetically levitated vehicle. The levitation and thrust force characteristics of the LSM are investigated by means of three-dimensional (3-D) numerical electromagnetic FEM calculations and experimental verification. Compared to a conventional LSM with electromagnets, a hybrid-excited LSM can improve levitation force/weight ratios, and reduce the power consumption of the vehicle. Because the two-dimensional (2-D) FE analysis model describes only the center section of the physical device, it cannot express the complex behavior of leakage flux, which this study is able to predicts along with levitation and thrust force characteristics by 3-D FEM calculations. A static force tester for a hybrid-excited LSM has been manufactured and tested in order to verify these predictions. The experimental results confirm the validity of the 3-D FEM calculation scheme for the description of a hybrid-excited LSM.

Design and Control of Levitation and Guidance Systems for a Semi-High-Speed Maglev Train

  • Kim, Min;Jeong, Jae-Hoon;Lim, Jaewon;Kim, Chang-Hyun;Won, Mooncheol
    • Journal of Electrical Engineering and Technology
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    • v.12 no.1
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    • pp.117-125
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    • 2017
  • Research on Maglev (Magnetic Levitation) train is currently being conducted in Korea, concerning Urban Transit (110 km/h of maximum speed), semi-high-speed (200 km/h of maximum speed), and high-speed (550 km/h of maximum speed) trains. This paper presents a research study on the levitation and guidance systems for the Korean semi-high-speed maglev train. A levitation electromagnet was designed, and the need for a separate guidance system was analyzed. A guidance electromagnet to control the lateral displacement of the train and ensure its stable operation was then also designed, and its characteristics were analyzed. The dynamic performance of the designed levitation and guidance electromagnets was modeled and analyzed, using a linearized modeling of the system equations of motion. Lastly, a test setup was prepared, including manufactured prototypes of the designed system, and the validity of the design was verified and examined with performance evaluation tests.

Electromagnet Actuator Analysis of Magnetic Levitation System (자기부상시스템의 전자석 구동기 해석)

  • Kim, Chan-Jo;Cho, Kyeum-Rae
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.11
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    • pp.75-80
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    • 2000
  • Recently, there are a great many research for magnetic levitation system. In case electromagnet is operated as the actuator of control system, first of all, we must analysis about an electromagnet. Important parameters of this system are inductance(L) and resistance(R) which are induced from the coil of electromagnet. And attractive force equation is also important. If the load of this system is large, phase delay is caused by self-inductance effect. Because this delay effect cause stability of whole magnetic evitation system to grow worse, a measures to diminish time constant must have been taken. And the linearized attractive force equation which is used at small range of the operating point is compensated to use at larger range, thus the experiment of magnetic levitation system will get a better result.

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