• Title/Summary/Keyword: Levitation control

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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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Decoupling Control of Tractive and Vertical Force of Linear Induction Motor (선형 유도전동기의 추진력 및 수직력 제어 방식)

  • Oh, Sung-Chul
    • Proceedings of the KIEE Conference
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    • 1996.07a
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    • pp.289-291
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    • 1996
  • Linear induction motor(LIM) is widely used to drive magnetic levitation train. To drive LIM, different control method compared with conventional rotary type machine is needed. Since vertical force is generated inherently and it effects on the levitation system, vertical force should be kept constant for stable levitation. To keep vertical force constant, slip frequency should be kept constant. Once slip frequency is kept constant, tractive force can be controlled by adjusting motor currents. In this paper, control methods used so far arc analyzed with some experimental results and decoupling control algorithm is proposed to control tractive and vertical force separately. Control algorithm is verified through simulation.

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Active vibration control of the secondary suspension for the magnetic levitation vehicle (자기부상열차 현가장치의 능동진동제어)

  • 강정식;강이석
    • 제어로봇시스템학회:학술대회논문집
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    • 1996.10b
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    • pp.876-879
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    • 1996
  • The vibration of an attractive magnetic levitation(Maglev) vehicle transportation system is caused by the irregularity of the guideway track and the performance of the suspensions of the Maglev system. It is essential for us to give attention to the secondary suspension of the vehicle system as it determines the ride quality. In order to improve the ride quality and running stability, active secondary suspensions have been developed and applied to the vibration problems. This paper analyzes the performance of the active secondary suspension which is applied to an attractive magnetic levitation vehicle system running on a rough track. The dynamics of the suspension system and the optimal control problems are studied. According to the transient and frequency response analyses to the track disturbance, the ride quality of an attractive Maglev vehicle has been improved by applying the designed LQR active controller, and it has been confirmed that this improvement was also influenced by the configuration of the system.

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Switching Control of Electromagnetic Levitation System based on Jacobian Linearization and Input-Output Feedback Linearization (자코비안 선형화 및 입-출력 궤환 선형화에 기반한 자기 부상 시스템의 스위칭 제어)

  • Jeong, Min-Gil;Choi, Ho-Lim
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.4
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    • pp.578-585
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    • 2015
  • Electromagnetic levitation system(EMLS) is one of the well known nonlinear systems. Often, it is not easy to control an EMLS due to its high nonlinearity. In this paper, we first apply two linearization method(jacobian and input-output feedback linearization) to design two feedback controllers for an EMLS. Then, by observing the advantages of each controller, we design a switching control algorithm which engage two controllers depending on the position of the steel ball in order to achieve the improved performance over each controller. The validity of our switching control approach is verified via both simulation and actual experimental results.

4 degrees of freedom control for attractive levitation module (자기부상 모듈의 4자유도 제어)

  • Kim, Kook-Hun;Kim, Choon-Kyung;Cho, Chang-Hee;Kim, Jong-Hoon;Park, Min-Kook
    • Proceedings of the KIEE Conference
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    • 1993.07a
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    • pp.271-273
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    • 1993
  • One maglev vehicle is composed of 6 or 8 modules. Each module is composed of 4 staggered magnets attached to an aluminum bogie. In the view point of levitation control except propulsion-by LIM. 5 is the maximum degree of freedom to be controlled. But rolling control of the vhhicle depends on the bogie structure. We describe just anti-roll type bogie structure and 4 degree of freedom control is sufficient for levitation quality improvement. Multivariable pole-placement concept is used for controller design. Control experiment is performed on a specially designed test module as well as actual bogie system.

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Design and Dynamic Analysis of Electromagnets for Levitation Application (부상용 전자석의 설계 및 동특성 해석)

  • Jang, Seok-Myeong;Choi, Jang-Young;Sung, So-Young;Sung, Ho-Kyoung
    • Proceedings of the KIEE Conference
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    • 2008.04c
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    • pp.83-85
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    • 2008
  • This paper deals with design and dynamic analysis of electromagnets for levitation applications. On the basis of equivalent magnetic circuit (EMC) method and 3-D finite element analysis (FEA) model, initial and detailed design for electromagnets are performed. Using the state equation for the closed-loop control, the dynamic analysis of electromagnets is also performed. Finally, this paper investigates the variation of levitation force according to current under fixed nominal air-gap, and the variation of required current according to load weight in order to maintain the nominal air-gap. From these results, the validation of design and dynamic analysis of electromagnets is confirmed. In particular, the influence of winding temperature on levitation control is discussed in detail.

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A Study on a Displacement Measurement Method of Magnetic Levitation System Applying the Inductance Characteristic (인덕턴스 특성을 이용한 자기부상계의 변위 측정의 한 방법에 관한 연구)

  • 김창화;양주호
    • Journal of KSNVE
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    • v.6 no.3
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    • pp.357-362
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    • 1996
  • The magnetic levitation system has great advantages, such as little friction, no lubrication, no noise and so on. But the magnetic levitation system need a stabilizing controller because it is a unstable, system in natural and it need a sensor for displacement measurement to control the system. In this paper, we proposed a sensorless method to measure the gap between the magnetic pole and the levitated object with application the inductance characteristic which vary according to gap. We made a driving circuit which supply simultaneously the control input PWM(Pulse Width Modulation) signal and the carrier PWM signal to estimate the gap. Because the inductance is a function of gap, and the current of the carrier signal is a function of the inductance, we could estimate the gap from the measurement of the current of the carrier signal. Finally, we investigated the validity of the proposed method through the experimental results.

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Design of TLBO-based Optimal Fuzzy PID Controller for Magnetic Levitation System (자기부상시스템을 위한 교수-학습 최적화 알고리즘 기반의 퍼지 PID 제어기 설계)

  • Cho, Jae-Hoon;Kim, Yong Tae
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.4
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    • pp.701-708
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    • 2017
  • This paper proposes an optimum design method using Teaching-Learning-based optimization for the fuzzy PID controller of Magnetic levitation rail-guided vehicle. Since an attraction-type levitation system is intrinsically unstable, it is difficult to completely satisfy the desired performance through the conventional control methods. In the paper, a fuzzy PID controller with fixed parameters is applied and then the optimum parameters of fuzzy PID controller are selected by Teaching-Learning optimization. For the fitness function of Teaching-Learning optimization, the performance index of PID controller is used. To verify the performances of the proposed method, we use a Maglev model and compare the proposed method with the performance of PID controller. The simulation results show that the proposed method is more effective than conventional PID controller.

Zero Power Levitation Control with Gap Compensator of Hybrid Magnet Levitation by Load Observer (부하 관측기에 의한 공극 보상기를 포함한 제로파워 부상제어)

  • Kim, Kwang-Min;Kim, Youn-Hyun;Chun, Yon-Do;Lee, Ju;Kim, Hak-Ryeon
    • Proceedings of the KIEE Conference
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    • 2000.07b
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    • pp.669-671
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    • 2000
  • This paper introduced the scheme that it improved performance of magnetic levitation system with zero power controller. Magnetic levitation is used widely, but it is complicated and difficult to control due to having nonlinear characteristics of gap and current. So, it is proposed a scheme considered changed gap according to variable load and is verified by simulation and experiments in this paper.

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Zero Power Control for an Attraction Type Magnetic Levitation System using Disturbance Observer (흡인식 자기부상 시스템의 외란관측자를 이용한 최소전력 부상제어)

  • Ahn, Joon-Seon;Yu, Sun-Jong;Kim, Sol
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.23 no.12
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    • pp.41-47
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    • 2009
  • In this paper, authors performed improvement of control characteristics of an attraction type magnetic levitation system. The attraction type magnetic levitation system has an inherent instability in the system, therefore its controller must have not only proportional-integral gain but also differential gain additionally. In this paper, authors were proposed control algorithm using disturbance observer(DOB) on feedback signal. The computer simulation and experiments were performed for its verification.