• Journal of KSNVE
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• v.5 no.1
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• pp.49-57
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• 1995

An electronic circuit device is developed such that the displacement between an electromagnet and a moving target can be estimated from the coil current measurement, and then applied to an active magnetic bearing system. In order to levitate the shaft without using displacement sensor the stable control gains are obtained from the linearized model which includes the gap estimation circuit. Experimental results show that the shaft, by the estimated gap feedback, can be levitated within $\pm$6 ${\mu}m$ positioning error.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2011.04a
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• pp.594-597
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• 2011

본 논문에서는 태양광 추적기에 구동하기 위하여 적용된 기존 기계식 방식의 단점을 극복하기 위하여 전자력을 사용하였다. 영구자석과 전자석의 배치와 형상에 따라서 자속밀도를 분석하고 두 개의 자석이 맞대어 있을 때 척력과 인력을 이용하여 태양광 추적기의 회전 매카니즘에 적용하였다.

• Proceedings of the KSR Conference
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• 2003.05a
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• pp.439-443
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• 2003

MAGLEV is the vehicle which can run in levitated condition by the electro-magnets, and the vehicle can run without any contact condition. In MAGLEV system achieving a high magnetic field for minimum weight is a noteworthy goal. Unfortunately the two aspects of this goal high field and low weight are contradictory. Suitable designs must be sought using optimization techniques. In this paper is a technique for designing a electro-magnet in terms of simple equation.

• Proceedings of the KIEE Conference
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• summer
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• pp.995-997
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• 2004

In this paper, CPM (controlled-permanent magnet)-type magnetic levitation system is designed and implemented. The CPM maglev system to be controlled consists of eight magnets with permanent magnet and electromagnet. The total weight of maglev module system is 1ton. The design procedure is also described and the result of this work is shown.

• Proceedings of the KIEE Conference
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• 1999.07g
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• pp.2986-2988
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• 1999

This paper presents a new concept to implement and to control of tactile reproduction simulator by implementation of compliance emulator system. Compliance emulator system is a kind of levitation system using magnetic force. In the compliance emulator system, a floated plate moves vertically. When an external force is applied to the plate, the system produces a controlled reaction force by using 6 electromagnet. For the control, a LVDT displacement sensor and PD control method is used.

• Proceedings of the KIEE Conference
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• summer
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• pp.998-1000
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• 2004

In this paper, the control system of the controlled-permanent magnet(CPM) type MagLev system of 1ton 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-varing system. The designed controller is validated by some kinds of experiments.

• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1553-1555
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• 2005

This paper presents a design of lossless hybrid-type magnetically-levitated vehicle. The lossless hybrid-type system is implemented by a permanent magnet and electromagnet. The target plant consists of eight hybrid-type magnets and in the steady-state, no current is needed to support the load. The design procedure is described and the results of this work are shown.

• Journal of the Korean Magnetics Society
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• v.5 no.5
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• pp.810-814
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• 1995

LPE growth experiment were carried out to make garnet crystal for Faraday rotator and we have evaluated the characteristics of Faraday rotator by a measurement system which is consist of electromagnet and optical components, also done Laue pattern analysis. The thickness of garnet film was $180\;\mu\textrm{m}$ and the Faraday rotation of this film was 388 deg/Cm at wavelength $1.55\;\mu\textrm{m}$, room temperature.

• Journal of the Korean Magnetics Society
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• v.5 no.5
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• pp.567-569
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• 1995

By using the ac field source which can change the applied field magnitude, frequency and dc offset field, the dynamic magnetoresistance characteristics of permalloy based multilayers which have different R-H(resistance-magnetic field) curves were monitored and compared with static magnetoresistance curves that were measured with electromagnet of VSM. Output of each sample according to the external field strength was identified and optimum bias position could be obtained.

• Journal of the Korean Institute of Intelligent Systems
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• v.24 no.2
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• pp.129-135
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• 2014

In the paper, we propose a design method for the logistics transportation system using magnetic levitation that has a good characteristics without mechanical friction, noise and dust. The proposed transportation system consists of a levitation control system and a propulsion control system. Magnetic levitation system is an electromagnetic suspension system in which electromagnet generates magnetic attractive force and the attractive force pulls the rail. We design a PID controller for the current control of electromagnets. We use linear induction motors for propulsion of the proposed logistics transportation system and adapt the space vector PWM method for the propulsion control system. The proposed transportation system using magnetic levitation is verified performances through levitation and propulsion experiments.