• Title, Summary, Keyword: LIM

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A Study on Deduction and Characteristic Analysis of Magnetic Equivalent Circuit Parameters of a Rotary-typed Small-scaled LIM for a Railway Transit (철도차량용 선형유도전동기 축소-회전형모델의 자기등가회로 파라미터 도출 및 특성 분석 연구)

  • Park, Chan-Bae;Lee, Hyung-Woo;Lee, Byung-Song
    • Journal of the Korean Society for Railway
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    • v.13 no.4
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    • pp.404-411
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    • 2010
  • Authors conducted a deduction and characteristic calculation of the some parameters using a magnetic equivalent circuit method to verify a basic design result of a rotary-typed small-scaled linear induction motor for a railway transit. In a LIM, it is possible to express the parameters of the magnetic equivalent circuit into a function of the shape of the secondary aluminium plate and the airgap between the LIM primary core and the secondary aluminium plate. It means that the LIM properties can be changed considerably by the shape of the secondary aluminium plate and the airgap between the LIM primary core and the secondary aluminium plate. So, authors analyzed a tendency of changes of the magnetic equivalent circuit parameters and the LIM characteristics by changing of the airgap, the thickness of the secondary aluminium plate and the overhang length and shape of a rotary-typed small-scaled LIM, and accomplished a basic research to develop a real-scaled LIM for a railway transit.

A Study on Deduction of Equivalent Circuit Parameters and Verification of Control Algorithm of Thrust Force of a Small-scaled LIM for a Railway Transit (철도차량용 선형유도전동기 축소형 모델의 등가회로 파라미터 도출 및 추진력 제어 알고리즘 검증 연구)

  • Park, Chan-Bae;Mok, Hyung-Soo;Lee, Ju
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.7
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    • pp.1248-1254
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    • 2010
  • Authors conducted a deduction of some parameters using the magnetic equivalent circuit method and a verification study of the thrust force control algorithm of a rotary-typed small-scaled linear induction motor for a railway transit. In a LIM, it is possible to express the parameters of the magnetic equivalent circuit into a function of the shape of the secondary aluminium plate and the airgap between the LIM primary core and the secondary aluminium plate. It means that the LIM properties can be changed considerably by the shape of the secondary aluminium plate and the airgap between the LIM primary core and the secondary aluminium plate. So, authors analyzed a tendency of changes of the magnetic equivalent circuit parameters and the LIM characteristics by changing of the airgap of the secondary aluminium plate of a rotary-typed small-scaled LIM. And authors conducted a verification study of the indirect vector control algorithm with constant slip frequency by using the rotary-typed small-scaled LIM tester set on the basis of the calculated LIM parameters. Finally authors accomplished a research on applicability for LIM railway transit.

자기부상열차 추진시스템에의 리니어모우터 응용추이

  • 장석명
    • 전기의세계
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    • v.42 no.12
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    • pp.24-33
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    • 1993
  • 1. LSHM은 제어성, 효율, 힘/중량면에서 매우 우수하고, LIM은 제어성과 신뢰성면, LSHM에 비하여 기술의 단순성에 의한 가공비와 유지보수비가 저렴한 측면에서 유리하다. 2. 효율면에서는 LHSM이 LIM이 보다 유리하지만 리니어모우터의 재작비와 특랙의 제작면에서는 LSRM이 유리하고, 리니어모우터의 자체중량이나, 트랙의 필요한 철의 중량면에서는 LIM이 유리하다. 3. LIM에비해 LSHM이 추진/부상이 동시에 발생할 수 있도록 수직력이 크게 발생하며, 효율과 역율이 매우좋다. 4. 가장 선두로 개발하고 있는 독일과 일본의 기술개발 연혁을 검토해 보면 공통점은 초기에는 유도형 LIM으로 시작하였다가 나중에는 동기형인 LIM으로 추진시스템으로 전환하였다.

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Molecular Cloning of a LIM Protein cDNA from the Mulberry Longicorn Beetle, Apriona germari

  • Gui, Zhongzheng;Wei, Yadong;Yoon, Hyung Joo;Kim, Iksoo;Guo, Xijie;Jin, Byung Rae;Sohn, Hung Dae
    • International Journal of Industrial Entomology
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    • v.9 no.1
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    • pp.149-153
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    • 2004
  • Here we report the molecular cloning of a LIM protein cDNA of the CRP (cysteine-rich protein) family from the mulberry longicorn beetle, Apriona, geramri. The A. germari LIM protein cDNA contains an open reading frame of 276 bp encoding 92 amino acid residues with a calculated molecular weight of approximately 10 kDa. The A. germari LIM protein contains the cysteine-rich consensus sequence of LIM domain and the glycine-rich consensus sequence observed in cysteine-rich protein family 1 (CRP1). The potential nuclear targeting signal is retained. The deduced amino acid sequence of the A. germari LIM protein cDNA showed 81 % identity to both Bombyx mori muscle LIM protein (Mlp) and Drosophila melanogaster Mlp60A and 77% to Epiblema scudderiana Mlp. Northern blot analysis showed that A. germari LIM protein is highly expressed in epidermis and muscle, and less strongly in midgut, but not in the fat body.

A LIM Protein Gene Homologue of Protaetia brevitarsis: cDNA Cloning and mRNA Expression

  • Kim Iksoo;Choi Yong Soo;Lee Sun Young;Kim Mi Ae;Kim Seong Ryul;Hwang Jae Sam;Jin Byung Rae
    • International Journal of Industrial Entomology
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    • v.11 no.1
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    • pp.71-74
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    • 2005
  • A LIM protein gene homologue of the CRP (cysteine­rich protein) family in the whiter-spotted flower chafer, Protaetia brevitarsis, was cloned. The P. brevitarsis LIM protein cDNA encodes a 92 amino acid polypep­tide with a predicted molecular mass of 10,030 Da and a pI of 8.57. The P. brevitarsis LIM protein contains the cysteine-rich consensus sequence of LIM domain and the glycine-rich consensus sequence observed in the cysteine-rich protein family 1 (CRPl). The potential nuclear targeting signal is retained. The deduced amino acid sequence of the P. brevitarsis LIM protein cDNA showed 92$\%$ identity to another beetle, Apriona germari LIM protein. Northern blot analysis showed that P. brevitarsis LIM protein is highly expressed in epidermis and midgut, but not in the fat body.

The Analysis on Dynamic Characteristics and the Static test of Inverter-fed Large capacity LIM (인버터로 구동되는 대용량 LIM의 정특성 시험과 동특성 해석)

  • Jang, S.M.;Lee, H.G.;Jeong, S.S.;Park, Y.T.;Kim, B.S.;Jeong, H.G.
    • Proceedings of the KIEE Conference
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    • pp.213-215
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    • 1996
  • Until now the test of LIM have been mainly experimented for a small capacity LIM. This paper deals with the static characteristics of a large capacity LIM which is designed for MAGLEV. And we developed the simulation program using electro-magnetic field theory and equivalent circuit method. Hence it is evaluated the performance of a large capacity LIM. Also this paper predicts the dynamic characteristics of LIM with the proposed simulation program.

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The Effect of Airgap Unbalance on the LIM Performance for Light Rail Road (공극 불균형이 경전철용 LIM의 특성에 미치는 영향)

  • Jung, In-Sung;Lee, Ju;Jung, Rak-Gyo;Lee, Jong-Woo
    • Proceedings of the KSR Conference
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    • pp.129-136
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    • 1998
  • The LIM can be used as a transport system with wheel structure. The structural tolerance cause the airgap unbalance and that effects on the LIM performance. The effect of airgap unbalance on the motor performance such as thrust force, velocity and armature current are investigated by using Finite Element Analysis (FEA). From this numerical works, it is known that the airgap unbalance almost does not effect on the motor performance and LIM for transport system is robust to the structural tolerance.

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An Experimental Study on Dynamic Test of LIM for Urban Transit Maglev Vehicle (IV) (도시형 자기부상열차 추진용 선형유도전동기의 동특성에 대한 실험적 연구(IV))

  • Kim, Bong-Seop;Chung, Hyun-Kap;Cho, Hung-Jae
    • Proceedings of the KIEE Conference
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    • pp.152-154
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    • 1998
  • This paper deals with propulsion system for the UTM-01(Urban Transit Maglev). We experiment about the LIM and the inverter at 4 running test maglev vehicle. It is measured voltage, current, power factor for inverter output. And we discussed about efficiency of the LIM about maglev system.

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Characteristics Analysis of LIM for Molten Metal Transportation According to Parameters (용융 금속 수송용 리니어 모터의 파라미터에 따른 특성 해석)

  • Cho, Huee-Je;Lee, Chul-Kyu;Kwon, Byung-Il
    • Proceedings of the KIEE Conference
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    • pp.46-48
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    • 2005
  • Recently, applications of electromagnetic forces in the molten metal delivery system like LIM(linear induction motor) have been developed because it is dangerous to deliver the molten metal. Therefore it is important to get the fundamental characteristics of LIM. In this paper, we analyzed about characteristics of LIM for molten metal transportation by 2D finite element method. Then we compares the characteristics of LIM for molten metal transportation according to parameters.

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Characteristic Analysis of Air-gap Control System in Performance Test Machine of a LIM for Railway Transit (철도차량용 선형유도전동기 성능시험기의 공극조절 시스템 특성 연구)

  • Park, Chan-Bae;Lee, Hyung-Woo;Lee, Byung-Song;Park, Hyun-June;Kwon, Sam-Young;Han, Kyung-Hee
    • Proceedings of the KSR Conference
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    • pp.1955-1961
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    • 2008
  • A lot of researches on a linear induction motor(LIM) have been advanced to realize a traction system with high efficiency and performance for railway transit for a long time. However, most of them are limited in design of a LIM part such as Primary and Secondary. At a LIM which is traveling, the change of an air-gap(It occurs by a construction tolerance of a secondary reaction plate) becomes the cause which decreases a smoother ride and the efficiency of railway transit system. Therefore, uniform air-gap operation of LIM is important issue to improve the system efficiency. However, the researches which control the air-gap length of the LIM with technical and high-cost problem have been not advanced a lot. Therefore, in this research, it is introduced an air-gap control system for performance test machine of a scale-downed LIM which is able to control the air-gap length of the LIM and monitor a variety of performance changes of the propulsion system, and conducted a research on feasibility of the system based on characteristic analysis.

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