• Title/Summary/Keyword: End effect

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IFOC of Linear Induction Motor Considering The End Effect for Medium High Speed Maglev Vehicle (중 고속 자기부상열차용 선형 유도전동기의 단부효과를 고려한 간접벡터 제어 알고리즘)

  • Seo, Hyunuk;Kim, Youngki;Choi, Seongho;Kim, Jubeom;Lee, Inseok
    • Proceedings of the KIPE Conference
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    • pp.121-122
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    • 2016
  • 본 논문에서는 중 고속 자기부상열차용 선형 유도전동기에서 나타나는 단부효과를 고려하여 중 고속 운전을 할 수 있는 제어 알고리즘을 제안한다. 선형 유도전동기에서 나타나는 단부효과를 수식적으로 분석하여 선형 유도전동기 시뮬레이션 모델을 구성하였으며, 단부효과의 영향을 보상하여 제어를 함으로서 선형 유도전동기 적합한 제어 알고리즘을 구성하여 시뮬레이션을 통하여 검증하였다.

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Analysis of Permanent Magnet linear Eddy Current Brake (영구자석 선형 와전류 제동기의 특성해석)

  • Jang, S.M.;Lee, S.H.;Jeong, S.S.;Cha, S.D.;Cho, H.J.;Kim, B.S.
    • Proceedings of the KIEE Conference
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    • pp.1226-1228
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    • 2002
  • Permanent magnet is applied to the mover of eddy current braking system for high speed. On the analytical 2D field solutions considering end effect, this paper deals with the magnetic field, and forces according to the secondary magnet array. Comparisons between analytical results and experimental results are also presented.

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Analysis of the End-Effect of Permanent Magnet Linear Synchronous Motor Energized by Partially Excited Primary Current (부분여자된 영구자석형 선형동기전동기의 단부효과 해석)

  • Jung, Sang-Yong;Chun, Jang-Sung;Jung, Hyun-Kyo
    • Proceedings of the KIEE Conference
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    • pp.306-308
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    • 2000
  • 부분여자된 영구자석형 선형동기전동기(PMLSM)의 단부효과를 고려한 특성을 나타낸다. 선형동기전동기의 고효율 운전을 위하여 전기자 권선을 가동자의 위치별 부분여자하였으며, 이와 더불어 양단부의 제한된 자석길이에 의한 단부효과를 나타낸다.

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A Study on Slip Frequency Control Algorithm of Linear Induction Motor (선형 유도전동기의 슬립주파수 제어 알고리즘에 관한 연구)

  • Lee, Jae-Hyun;Mok, Hyung-Soo;Lee, Jin-Woo;Kim, Sang-Hoon;Kim, Myong-Han
    • Proceedings of the KIPE Conference
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    • pp.166-168
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    • 2008
  • This paper presents a vector control of Linear Induction Motor(LIM) based on a slip frequency control. And a Linear Induction Motor modeling included the end effect using circuit and equation method is also presented. We demonstrated through simulation the improvements achieved by the proposed scheme.

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A Control Algorithm of Linear Induction Motor based on Indirect Vector Control (간접 벡터 제어에 근거한 선형유도전동기의 제어 알고리즘)

  • Lee, Jae-Hyun;Jeon, Mi-Rim;Mok, Hyung-Soo;Lee, Jin-Woo;Kim, Sang-Hoon;Kim, Chul-Ho;Chung, Eun-Sung
    • Proceedings of the KSR Conference
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    • pp.302-309
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    • 2008
  • This paper presents a vector control of Linear Induction Motor base on a slip frequency control. And a linear induction motor modeling included the end effect using circuit and equation method is also proposed. We demonstrated through simulation the improvements achieved by the proposed scheme.

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On the Thrust force Calculation and Normal Force Reduction of SLIM for Propulsion of Vehicles (차랑 추진용 SLIM의 추력산정 및 수직력 경감에 대하여)

  • Im, Dal-Ho;Cho, Yun-Hyun;Koo, Dae-Hyun
    • Proceedings of the KIEE Conference
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    • pp.23-27
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    • 1990
  • This paper proposes the calculation method of the needed thrust force and the input current which are considered the end effect and the normal force effect of SLIM for the propulsion vehicles. To estaninate theperformance of SLIM, the thrust force, the normal force, the efficiency and the power factor are comput ed according to the variation of frequency and pole pitch.

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EFFECT OF TOP END CONDITION OF FUEL BED CONTAINER ON DOWNWARD SMOLDER SPREAD

  • Sato, Kenji;Sakai, Yasuhiro
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • pp.146-153
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    • 1997
  • An experimental study was performed of natural-convection downward smolder spread across a sawdust bed peripherally enclosed with an insulating container, to examine the effect of the open- ing condition at the top end on downward smolder spread. Experiments were conducted by using relatively coarse sawdust and 25-cm-long cylindrical container The variations of temperature profiles along the bed axis with time were determined far different opening conditions and were com-pared with those in smolder spread from open top to open bottom. It was shown that the smolder zone initiated from open top toward closed bottom penetrates the bed with keeping high peak temperature like the case of open top to open bottom spread, although mean spread rate is smaller. This indicates that the downward smolder zone can be sustained stably if sufficient air or oxygen Is supplied from the back of it by natural convection even if upward draft entering from the bottom of the bed is absent. When the top end was partially closed by mounting a cover after stable smolder spread had begun from open top toward open bottom, the temperature at the peak decreased more than 200 K and the smolder zone became to spread with thickening residue. In this case, the shape of temperature profiles continuously changed or decayed until end-effect at the open bottom end enhanced the reaction. The temperature at the shrunk peak, free from the end-effect, was almost identical with the temperature at the exothermic oxidative-degradation zone in smolder spread from open top to open bottom. from these results, it can be inferred for natural-convection downward smolder spread that the oxidation reaction of the char is very sensitive to the oxygen supply by natural convection in the space above the smolder zone, and that the top end opening condition strongly alters the completeness of reactions, structure, and behavior of the smolder zone.

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Characteristics Analysis of Linear Induction Motor Considering Airgap variation for Railway Transit (공극변화를 고려한 철도차량용 선형 유도전동기 특성 연구)

  • Lee, Byung-Song;Lee, Hyung-Woo;Park, Chan-Bae;Han, Kyung-Hee;Kwon, Sam-Young;Park, Hyun-June
    • Proceedings of the KSR Conference
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    • pp.1610-1615
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    • 2007
  • This paper presents a characteristics of linear induction motor considering airgap variation for railway transit in order to achieve high performance of the vehicle. The operating principle of a LIM(Linear induction motor) is identical to a rotary induction motor. Space-time variant magnetic fields are generated by the primary part across the airgap and induce the electro-motive force(EMF) in the secondary part, a conducting sheet. This EMF generates the eddy currents, which interact with the airgap flux and so produce the thrust force known as Loren's force. Even though the operating principal is exactly same as a rotary motor, the linear motor has a finite length of the primary or secondary parts and it causes static and dynamic end-effect which is the discontinuous airgap flux phenomenon. This end-effect causes the deterioration of the system performance, especially in high-speed operation. Another problem is that construction tolerance restricts the minimum airgap in order to prevent a collision between the primary part and the secondary reaction plate. More over, as the airgap length is getting smaller, the attraction force between the primary part and secondary parts is getting larger dramatically and the attraction force would be another friction against propulsion. Therefore, it is necessary to figure out the characteristics of linear induction motor considering airgap variation in order to achieve high performance of the vehicle. The dynamic model of LIM taking into account end-effects is derived. Then the modified mechanical load equation considering the effect of the attraction and thrust force according to the airgap variation is analyzed. The simulation results are presented to show the effect of the LIM according to the airgap variation.

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Monitoring of Chemical Processes Using Modified Scale Space Filtering and Functional-Link-Associative Neural Network (개선된 스케일 스페이스 필터링과 함수연결연상 신경망을 이용한 화학공정 감시)

  • Park, Jung-Hwan;Kim, Yoon-Sik;Chang, Tae-Suk;Yoon, En-Sup
    • Journal of Institute of Control, Robotics and Systems
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    • v.6 no.12
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    • pp.1113-1119
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    • 2000
  • To operate a process plant safely and economically, process monitoring is very important. Process monitoring is the task to identify the state of the system from sensor data. Process monitoring includes data acquisition, regulatory control, data reconciliation, fault detection, etc. This research focuses on the data recon-ciliation using scale-space filtering and fault detection using functional-link associative neural networks. Scale-space filtering is a multi-resolution signal analysis method. Scale-space filtering can extract highest frequency factors(noise) effectively. But scale-space filtering has too large calculation costs and end effect problems. This research reduces the calculation cost of scale-space filtering by applying the minimum limit to the gaussian kernel. And the end-effect that occurs at the end of the signal of the scale-space filtering is overcome by using extrapolation related with the clustering change detection method. Nonlinear principal component analysis methods using neural network have been reviewed and the separately expanded functional-link associative neural network is proposed for chemical process monitoring. The separately expanded functional-link associative neural network has better learning capabilities, generalization abilities and short learning time than the exiting-neural networks. Separately expanded functional-link associative neural network can express a statistical model similar to real process by expanding the input data separately. Combining the proposed methods-modified scale-space filtering and fault detection method using the separately expanded functional-link associative neural network-a process monitoring system is proposed in this research. the usefulness of the proposed method is proven by its application a boiler water supply unit.

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Thrust Force Characteristics Analysis of Linear Induction Motor Considering Airgap variation for Railway Transit (공극변화를 고려한 철도차량용 선형 유도전동기 특성 연구)

  • Lee, Byung-Song
    • Proceedings of the KSR Conference
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    • pp.1903-1908
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    • 2008
  • This paper presents a characteristics of linear induction motor considering airgap variation for railway transit in order to achieve high performance of the vehicle. The operating principle of a LIM(Linear induction motor) is identical to a rotary induction motor. Space-time variant magnetic fields are generated by the primary part across the airgap and induce the electro-motive force(EMF) in the secondary part, a conducting sheet. This EMF generates the eddy currents, which interact with the airgap flux and so produce the thrust force known as Loren's force. Even though the operating principal is exactly same as a rotary motor, the linear motor has a finite length of the primary or secondary parts and it causes static and dynamic end-effect which is the discontinuous airgap flux phenomenon. This end-effect causes the deterioration of the system performance, especially in high-speed operation. Another problem is that construction tolerance restricts the minimum airgap in order to prevent a collision between the primary part and the secondary reaction plate. More over, as the airgap length is getting smaller, the attraction force between the primary part and secondary parts is getting larger dramatically and the attraction force would be another friction against propulsion. Therefore, it is necessary to figure out the characteristics of linear induction motor considering airgap variation in order to achieve high performance of the vehicle. The dynamic model of LIM taking into account end-effects is derived. Then the modified mechanical load equation considering the effect of the attraction and thrust force according to the airgap variation is analyzed. The simulation results are presented to show the effect of the LIM according to the airgap variation.

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