• Journal of Magnetics
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• 제18권3호
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• pp.370-374
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• 2013

This paper introduces an innovative hybrid array consisting of both permanent and electro magnets. It will enable us to develop an active control mechanism for underdamped electro-dynamic suspension (EDS) Maglev systems. The proposed scheme is based on the Halbach array configuration which takes the major technical advantage from the original Halbach characteristics: a strongly concentrated magnetic field on one side of the array and a cancelled field on the opposite side. In addition, the unique feature of the proposed concept only differs from the Halbach array with permanent magnets. The total magnetic field of the array can be actively controlled through the current of the electro-magnet's coils. As a result, the magnetic force produced by the proposed hybrid array can also be controlled actively. This study focuses on the magnetic characteristics and capability of the proposed array as compared to the basic Halbach concept. The results show that the proposed array is capable of producing not only an equivalent suspension force of the basic Halbach permanent magnet array but also a controlled mode. Consequently, the effectiveness of the proposed array confirms that this study can be used as a technical framework to develop an active control mechanism for an EDS Maglev system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 B
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• pp.1334-1336
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• 2004

The existing problems of the Electro-Magnetic Suspension system such as air-gap disturbance, mass variation and actuator/sensor failure are described in amore specific manner. These problem can not be solved by conventional state-feedback and output-feedback control. Extended Kalman Filter is to linearize about a trajectory that is continually updated with the state estimates resulting from the measurements. In this paper, first, the physical properties of the EMS system are described. second, Extended Kalman Filer designed as form appliable EMS system. It is shown that state estimation performance can be obtained with the use of Extended Kalman filter, and that results from simulation, stability analyze.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 B
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• pp.1337-1339
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• 2004

The existing problems of the Electro-Magnetic Suspension system such as air-gap disturbance, mass variation and actuator/sensor failure are described in amore specific manner. General active filter has a bad influence on suspension stability. Kalman Filter is based on statistical parameter. Thus, in this paper, It is shown that filtering performance of Kalman Filter and Active filter is excellent with simulation and experiment, stability analyze for air-gap disturbance.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.549-554
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• 2008

The recent trains are almost being operated by the mechanical propulsion force to drive the gear and wheel with the traction motor. However Magnetic Levitation Vehicle is differently operated. Magnetic Levitation Vehicle is applied with Linear Induction Motor(LIM) that has many advantage like to high capability of going up to slope, low noise, easy to control of speed. So domestic and many advanced countries are interested in Magnetic Levitation Vehicle and they have been studying about it continuously. Thus this paper is studied the LIM test method of static states and guess the optimum driving point by characteristic of static states for LIM. The test items are measurement of thrust force by changed air gap, measurement of thrust force and normal force by changed slip frequency etc.

• 한국철도학회논문집
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• 제18권3호
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• pp.175-185
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• 2015

일반적으로 열차분야에서 분기기 시스템은 안전성과 직접적으로 연관되기 때문에 높은 신뢰성이 요구된다. 특히 자기부상열차의 분기기 시스템은 대차가 궤도를 감싸는 구조적 특징으로, 고가궤도 전체가 움직여야 한다. 이러한 이유로 자기부상열차의 분기기는 강 재질로 설계되었다. 강 거더의 분기기는 콘크리트 거더에 비하여 진동측면뿐만 아니라 거더의 처짐에도 취약하다. 그러므로 자기부상열차가 유연한 분기기 위를 통과 할 때, 부상안정성 예측이 매우 중요하다. 본 논문의 목표는 자기부상열차와 분기기 거더의 연성된 동역학 해석모델을 개발하고, 공진예측 및 차량의 부상안정성 예측에 있다. 이를 위해서 차량의 3차원 다물체 동역학 모델을 개발 하였고, 분기기 거더와 모달중첩법을 이용한 연성모델링을 수행하였다. 개발된 해석모델은 실측 실험과 비교를 통해서 해석모델의 타당성을 검증하였다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1991년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 22-24 Oct. 1991
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• pp.1091-1097
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• 1991

A logical and systematic procedure to derive a mathematical model for magnetically levitation(maglev) systems with a combined lift and guidance is developed by using and graph. First, bond graph is constructed for the energy-feeding system with magnetic leakage flux. And, the overall maglev system in which lift and guidance dynamics are coupled is modeled by using the concept of multi-port field in bond notations. Finally, the LQG/LTR control systems are designed for single-input single-output and for multi-input multi-output maglev systems. In this paper, it has been shown that the bond graph is an excellent method for modeling multi-energy domain systems such as maglev systems and the multivariable control system is required to improve the performance of the maglev system with a combined lift and guidance.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.1451-1455
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• 2007

MAGLEV(Magnetic Levitation) with Middle-low speed be classified as a kind of LRT(Light Rail Transit) in KOREA. Also this vehicle has adopted LIM propulsion method. The MAGLEV has adopted LIM type in operational or developing model in the world. The power rail of LIM is very similar with the 3th rail of LRT in the functional property but the structure and shape of power rail is different with that. WE have to search the optimal power rail system for Korean MAGLEV vehicle. In this paper, we suggest the conceptual design and direction of design for power rail of Korean MAGLEV developing.

• 전자공학회논문지
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• 제50권1호
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• pp.269-275
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• 2013

본 논문에서는 Extreme Learning Machine(ELM)을 이용한 자기부상시스템 모델링 기법을 제안한다. 자기부상시스템의 모델링을 위하여 일반적으로 테일러 급수를 이용한 선형화 모델이 사용되어져 왔으나, 이런 수학적 기법의 경우 자기부상시스템의 비선형 반영에 한계가 있다는 단점을 가지고 있다. 이러한 단점을 극복하기 위해 본 논문에서는 학습시간이 빠른 특성을 가진 ELM을 이용한 자기부상시스템의 모델링 기법을 제안한다. 제안된 기법은 입력 가중치들과 은닉 바이어스들의 초기값을 무작위로 선택하고 출력 가중치들은 Moore-Penrose의 일반화된 역행렬 방법을 통하여 구해진다. 실험을 통하여 제안된 알고리즘이 자기부상시스템의 모델링에서 수학적 기법에 비해 우수한 성능을 보임을 알 수 있었다.

• 한국초전도ㆍ저온공학회논문지
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• 제9권1호
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• pp.76-81
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• 2007

This paper deals with the characteristics of a small scale $high-T_c$ superconducting(HTSC) levitation system. The levitation tester. which models after electrodynamic suspension(EDS) maglev, consists of one HTSC magnet, a reaction plate, and force measuring components. Instead of moving magnet, AC current was applied to the fixed HTSC magnet. The magnet also has persistent current switch(PCS). The inductance of the magnet was 18.5 mH and total joint resistance of the magnet was $5.74{\times}10^{-7}\Omega$. AC current was applied into the HTSC magnet with various frequencies and the levitation force was calculated and measured. According to the increase of the vehicle speed, the levitation force was saturated.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.93-97
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• 2011

This paper presents the performance and test results of propulsion system which is met the requirements of urban MAGLEV. The design of propulsion system should be considered the effect of attractive force by the magnetic levitation and train running resistance. In this paper, the tractive and braking thrust are calculated and the train performance is simulated for the service track. Finally the test results of complete car are shown to verify the performance.