• Title/Summary/Keyword: Reaction plate

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The Analysis of Transverse Edge Effect of Linear Induction Motor by using Finite Element Method (유한요소법을 이용한 선형유도전동기의 횡방향 모서리 효과 분석)

  • Lee, Sung-Gu;Bae, Jae-Nam;Lee, Hyung-Woo;Park, Hyun-June;Kwon, Sam-Young;Lee, Ju
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.12
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    • pp.2194-2198
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    • 2008
  • In this paper, the construction of secondary reaction plate is analyzed by 3-D Finite Element Method(3-D FEM) to consider the influence of its variation on the transverse edge effect of LIM. The effective 3-D analysis model for considering the transverse edge effect caused by the finite widths of the primary and the secondary is proposed. The simple method measuring the transverse edge effect by using the patterns of currents induced in the secondary reaction plate is also proposed. With this effective analysis method, various models of secondary reaction plate with overhang and cap has been analyzed to consider the relationship between the construction of secondary reaction plate and the transverse edge effect of LIM.

A Study on the Thrust Characteristic Analysis of Linear Induction Motor according to Secondary Reaction Plate Using the Container Scanner Vehicle (컨테이너 검색기 이송대차 추진용 선형 유도전동기의 2차측 리액션플레이트 재질에 따른 특성 연구)

  • Jeong, Jae-Hoon;Choi, Jang-Young;Sung, So-Young;Park, Jong-Won;Lim, Jaewon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.1
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    • pp.65-72
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    • 2016
  • This paper presents the analysis of the analysis of thrust characteristics of linear induction motors(LIMs) according to secondary reaction plate. LIMs are well known as high speed transport systems, which can obtain thrust directly without gears and links, or auxiliary mechanisms. A simple structure, easy maintenance, and less environmental pollution are advantages of LIMs. In transport systems using LIMs, the secondary reaction plate is an important design factor, because it has considerable impact on the cost of the railway as well as the performance of the LIMs. This paper deals analyzed the characteristics of linear induction motor used for moving the vehicle of container scanner. Thrust, efficiency and load characteristic were interpreted with FEM regarding two models whose material of secondary reaction plate was copper and aluminum. It suggested the interpretation of thrust, efficiency and power factor characteristic along slip and compared the operation ability of linear induction motor through characteristics analysis along the load.

LIM 2차측 도체형상의 알루미늄 사용량과 추진특성과의 관계

  • Park, Hyun-June;Lee, Hyung-Woo;Kim, Hyung-Chul
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.251-251
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    • 2010
  • Linear induction motor performance for a light-weight urban transit has been established and verified. In this paper, linear induction motor is analyzed by finite-element method to consider influence of construction of secondary reaction plate on the transverse edge effect. With this effective analysis method, various models with overhang and cap have been analyzed to consider the relationship between the construction of secondary reaction plate and the transverse edge effect.

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A Study on the Thrust Characteristic Analysis of Linear Induction Motor according to Secondary Reaction Plate (선형 유도전동기의 2차측 리액션 플레이트에 따른 추력특성 연구)

  • Jeong, Jae-Hoon;Choi, Jang-Young;Lim, Jaewon;Sung, So-Young
    • Proceedings of the KIEE Conference
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    • pp.730-731
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    • 2015
  • This paper presents the analysis of the analysis of thrust characteristics of linear induction motors(LIMs) according to secondary reaction plate. LIMs are well known as high speed transport systems, which can obtain thrust directly without gears and links, or auxiliary mechanisms. A simple structure, easy maintenance, and less environmental pollution are advantages of LIMs. In transport systems using LIMs, the secondary reaction plate is an important design factor, because it has considerable impact on the cost of the railway as well as the performance of the LIMs.

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Influence of the airgap tolerance on performance of a Linear Induction Motor (공극 공차가 선형유도전동기에 미치는 영향)

  • Lee, H.W.;Lee, S.G.;Park, C.;Kwon, S.Y.;Lee, B.S.;Lee, Ju;Park, H.J.
    • Proceedings of the KSR Conference
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    • pp.1468-1472
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    • 2009
  • This paper presents the influence of the airgap tolerance on performance of a linear induction motor. Construction tolerance of the plate affects directly to the cost and performance of the Linear metro. LIM has around 10[mm] large airgap with many restrictions such as construction tolerance, thermal expansion and bend of the reaction plate, abrasion of the wheel, and so on. In order to have steady performance, the airgap should be uniform. But it is impossible to maintain the secondary reaction plate be flat along with the long track. Therefore the influence of the flatness on performance of a LIM should be investigated.

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Characteristic Analysis of a Linear Induction Motor for a Lightweight Train According to Various Secondary Schemes

  • Lee, Hyung-Woo;Lee, Sung-Gu;Park, Chan-Bae;Lee, Ju;Park, Hyun-June
    • International Journal of Railway
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    • v.1 no.1
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    • pp.6-11
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    • 2008
  • This paper presents a performance characteristic analysis methodology for a linear induction motor used for a lightweight train. In general, an analytical method cannot provide accurate results in a linear motor because of large airgap, end effect, transverse edge effect, 3-dimensional configurations, large leakage, and so on. Besides, a numerical method requires lots of memory and solving time for transient analysis. However, the suggested methodology which is a kind of hybrid solution with an analytical method and a numerical method is very fast and accurate. Based on the methodology, 3-D FEM analyses for various design schemes of the secondary reaction plate have been done and from the analysis results, the best configuration for an urban railway transit is chosen.

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Analysis of Dynamics Characteristics for Friction Elements in Automatic Transmission (자동변속기 마찰요소의 동특성 해석)

  • 최영종;정우진;김성원
    • Transactions of the Korean Society of Automotive Engineers
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    • v.5 no.5
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    • pp.9-19
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    • 1997
  • In this paper, the modeling and analysis of dynamic characteristics has been carried out for friction clutches and brakes in an automatic transmission. From the operating oil pressure generated by the valve-body, time delay by check valve and the movement of piston has been examined. Also torque capacity and torque transferred at the clutch is studied. Heat capacity and temperature distribution at the reaction plate of clutch are codeled by time-dependent, nonhomogeneous partial differential equation, and brake torque, brake time, and the amount of heat generated are investigated. It is found that the time delay at the check valve is very short but dominant at the spool.

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Air Gap Change of a Maglev Vehicle at the Moment a Linear Induction Motor Runs (자기부상열차 가속 순간 부상공극 변화)

  • Shin, Hyeon-Jae;Han, Hyung-Suk;Kim, Dong-Sung;Kim, Bong-Seup
    • Proceedings of the KSR Conference
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    • pp.1218-1223
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    • 2009
  • LIM(Linear induction motor)s are the main type of motors used for urban Maglev vehicles because they are less expensive to operate at a lower speed than linear synchronous motors. An LIM generates an attraction force while running, which perturbs the air gap of the electromagnet. This undesirable air gap variation could result in the mechanical contact of an electromagnet with the reaction plate. For this reason, the magnitude of the air gap variation must be limited within a certain range. The air gap changes when running the 1/2 vehicle under development for testing are analyzed through a test on the test track at KIMM. The results from this study could be used to minimize the air gap variations due to attraction force from LIM.

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Study on the Characteristics of a Small Scale HTSC Levitation Magnet (소형 초전도 부상자석의 특성 연구)

  • Cho, Hung-Je;Bae, Duck-Kweon;Lee, Jong-Min;Ko, Tae-Kuk
    • Progress in Superconductivity and Cryogenics
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    • v.9 no.1
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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.