• Title, Summary, Keyword: Magnetic suspension

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Optimal Design of Magnetic Suspension Using Design of Experiment (실험계획법을 이용한 Magnetic suspension의 최적설계)

  • Jung, Jae-Woo;Kim, Sung-Ill;Ha, Seung-Hyoung;Hong, Jung-Pyo;Lee, Ju-Hoon
    • Proceedings of the KIEE Conference
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    • pp.769-770
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    • 2006
  • This paper proposes the design method of a magnetic suspension that can control external vibration caused by low frequencies on the external vibrations by low frequencies. The magnetic suspension with individual controls is able to compensate the vibrations unlike a mechanical suspension. In the magnetic suspension, two characteristics are required. Firstly, magnetic motive force(MMF) by armature winding must be increased linearly. Secondly, identical magnitude of output force should be produced as direction of MMF. In this paper, axis-symmetric finite element analysis is used for magnetic field analysis. In order to optimize magnetic suspension, response surface methodology combined with experimental design is applied to investigate the characteristics and optimize the magnetic suspension for vibration -free table.

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Magnetic Suspension Effect of BiPbSrCaCuO Superconducting Bulk (BiPbSrCaCuO 초전도 벌크의 Magnetic Suspension)

  • 이상헌
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.17 no.5
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    • pp.545-551
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    • 2004
  • Magnetic suspension effect has been studied by using superconductor of BiPbSrCaCuO ceramics containing Ag$_2$O. Magnetic flux measurements of a toroidal magnet revealed a concave shaped field distribution with a null field along the axis of the torus at the point where the field reversed. The suspension effect was observed only for the Ag$_2$O doped and field cooled sample which is attributed to the enhanced flux pinning due to the field cooled condition. It has been cleared that Ag$_2$O acts as pinning center which plays an important role to the magnetic suspension effect. Magnetic repulsive force which affects a superconductor located in magnetic flux from toroidal magnet has been investigated. It has been concluded that the magnetic suspension effect arises from the interaction between the pinning effect and the diamagnetic effect.

Magnetic Suspension Effect of BiPbSrCaCuO Superconductor (Bi계 초전도체의 Magnetic Suspension)

  • 이상헌
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.101-103
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    • 2001
  • Suspension effect has been studied by using superconductor of BiPbSrCaCuO ceramics containing Ag$_2$O It has been cleared that Ag$_2$O acts as pinning center which plays an important role to the suspension effect. Magnetic repulsive force which affects a superconductor located in magnetic flux from toroidal magnet has been investigated. It has been concluded that the suspension effect arises from the interaction between the pinning effect and the diamagnetic effect.

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Fuzzy Estimator for Gain Scheduling and its Appliation to Magnetic Suspension

  • Lee, Seon-Ho;Lim, Jong-Tae
    • Transactions on Control, Automation and Systems Engineering
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    • v.3 no.2
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    • pp.106-110
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    • 2001
  • The external force disturbance is the one of the main causes that deteriorate the performance of the magnetic suspension. Thus, this paper develops a fuzzy estimator for gain scheduling control of magnetic suspension system suffering from the unknown disturbance. The propose fuzzy estimator computes the disturbance injected to the plant the gain scheduled controller generates the corresponding stabilizing control input associated with estimated disturbance. In the simulation results we confirm the novelty of the proposed control scheme comparing with the other method using a feedback linearization.

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Magnetic Suspension Effect of BiPbSrCaCuO Superconductor (Bi계 초전도체의 Magnetic Suspension)

  • Lee, Sang-Heon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.101-103
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    • 2001
  • Suspension effect has been studied by using superconductor of BiPbSrCaCuO ceramics containing $Ag_{2}O$ It has been cleared that $Ag_{2}O$ acts as pinning center which plays an important role to the suspension effect. Magnetic repulsive force which affects a superconductor located in magnetic flux from toroidal magnet has been investigated. It has been concluded that the suspension effect arises from the interaction between the pinning effect and the diamagnetic effect.

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A Study for Active Vibration Control of a Automotive Suspension System Using Electro-magnetic Damper (전자기 마그네틱 댐퍼를 이용한 자동차 현가계 진동의 능동 제어 연구)

  • Lee, Gyeong-Baek;Kim, Yeong-Bae;Lee, Hyeong-Bok
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.1
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    • pp.71-78
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    • 2002
  • This paper is concerned with the design and implementation of magnetic damper system to reduce the vibration of suspension system actively. Cylindrical type electro-magnetic actuator with permanent magnet is analyzed and effective controller design is made. Magnetic force analyzed and transfer function for the total system is determined by experimental data using error minimization method. For experiments, simple suspension structure system is utilized, in which a magnetic damper composed of permanent magnet and digital controller is attached. In order to drive the system, bipolar power amplifier of voltage control type is utilized. Stable and high speed control board is used to perform digital control logic for the given system. This paper shows that the magnetic damper system using phase-lead controller excellently reduces vibration of 1-D.O.F (degree of freedom) suspension system.

An Inductive Position Sensor for Self-sensing Magnetic Suspension System (셀프센싱 자기 부상계를 위한 인덕턴스형 변위센서)

  • 윤형진;이상헌;백윤수
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.1038-1041
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    • 2003
  • The magnetic suspension system is used in many areas, because it has great advantages. such as no friction, no noise, no lubrication and so on, but it is a unstable system in natural. It must have a feedback control with the position is measured for a stable levitation. There are an eddy-current sensor, a capacitive sensor, an inductive sensor, and an optical sensor with a laser as the sensor which measures displacements without contact. Among them, an inductive sensor is made with lower price than others. And it has a good linearity. In this paper, a magnetic circuit leads a linear equation between an input as a displacement and an output as a voltage. Experiments establish that voltage change according to displacement is linear. This paper presents the preliminary study of an inductive position sensing for self-sensing magnetic suspension system.

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A Magnetic Suspension Stage Based on the Switched Reluctance Propulsion Principle (Switched Reluctance 추진 원리에 기초한 자기 부상형 위치결정기구)

  • Lee Sang-Heon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.30 no.6
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    • pp.622-630
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    • 2006
  • This paper is about the magnetic suspension stage based on the Switched Reluctance propulsion principle. Because the previous studies on contact-free stage adopted the Lorentz force for main force generation mechanism they have suffered from thermal problem deteriorating the precision. Thus, the magnetic suspension stage adopting SR principle which can achieve high force density is proposed. The main operating principle and structure for achieving high resolution and long travel range are represented. The magnetic force analysis of each actuator, providing back data for dynamic modeling and controller design are carried out. By conducting basic experiments, the feasibility of the proposed system is shown. In addition the problems which should be improved and their solutions are represented.

Self-Sensing Magnetic Suspension System using an LC Resonant Circuit with a Positive Position Feedback Controller (LC공진 회로와 PPF제어기를 이용한 자체 측정식 자기 서스펜션 시스템)

  • 최창환;박기환
    • Journal of Institute of Control, Robotics and Systems
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    • v.5 no.7
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    • pp.787-793
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    • 1999
  • A self-sensing magnetic suspension system utilizing a LC resonant circuit is proposed by using the characteristic that the inductance of the magnetic system is varied with respect to the air gap displacement. An external capacitor is added into the electric system to make the levitation system be statically stable system, which much relieves the control effort required to stabilize the magnetic suspension system of haying an intrinsic unstable nature. For the realization of the self- sensing magnetically levitated system, an amplitude modulation / demodulation method is used with a positive position feedback controller Experimental results are presented to validate the proposed method.

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Modeling and Aalyzing Electromagnets for Magnetic Suspension Systems

  • Lee, Sang-Heon;Baek, Yoon-Su;Jung, Kwang-Suk
    • International Journal of Precision Engineering and Manufacturing
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    • v.7 no.4
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    • pp.28-33
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    • 2006
  • Various precision engineering studies have attempted to remove mechanical friction, which causes the performance of a system to deteriorate, from precision positioning devices. Since the classical fluid lubrication method has some disadvantages in clean environments, attention has been focused on magnetic bearings and contact-free systems with their pollution-free characteristics. In this paper, f electromagnets are modeled and analyzed, not only for magnetic bearings but also for contact-free electromagnetic actuators. Three types of electromagnets that are appropriate for various applications were considered using magnetic circuitry theory. The results were experimentally validated.