• Title/Summary/Keyword: 3-D FEM

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Skew Analysis of Synchronous Reluctance Motor Using Equivalent Magnetic Circuit Method (등가자기회로법을 이용한 동기형 릴럭턴스 전동기의 스큐해석)

  • Ahn, Joon-Seon;Lim, Seung-Bin;Kim, Sol;Lim, Seong-Yeop;Kwon, Sam-Young;Lee, Ju
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.55 no.3
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    • pp.123-130
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    • 2006
  • This paper presents characteristics analysis of skewed Synchronous Reluctance Motor using equivalent magnetic circuit and compares with the result of Finite Element Method. Torque ripple must be reduced, because it is producing noise and vibration. There is many kinds of method to reduce torque ripple, but generally we apply skewing stator or rotor. The 2D Finite Element Method(FEM) or 3D FEM is used to analyze the motor, since skew influence the average torque in the motor. However, the FEM takes much time in spite of the advanced computer and numerical technique. This paper will analyze characteristics of skewed synchronous reluctance motor using equivalent magnetic circuit.

A study on the forming process and formability improvement of clutch gear for vehicle transmission (자동차 트랜스미션용 클러치 기어의 성형 공법 및 성형성 향상에 관한 연구)

  • Lee K. O.;Kang S. S.;Kim J. M.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2005.05a
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    • pp.184-187
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    • 2005
  • Forging process is one of the forming process and is used widely in automobile parts and manufacture industry. Especially the gears like spur gear, helical gear, bevel gear were produced by machine tool, but recently they have been manufactured by forging process. The goal of this study is to study forming process with data obtained by comparison between forward extrusion and upsetting simulation results and formability improvement by various heat treatment conditions. By analysis data of 3D FEM by upsetting and forward extrusion forming, the forming process of clutch gear develops using data based on 3D FEM analysis. Through tensile test using specimens by various heat treatment conditions, the optimal heat treatment condition is obtained by comparison the results of tensile test.

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Improved Effects of Steel Pipe Reinforced Multi-Step Grouting Method Using the Nonlinear 3-D Tunnel Analysis (3차원 터널해석에 의한 강관보강형 다단그라우팅의 보강효과)

  • Lee, Bong-Ryeol;Kim, Hyeong-Tak;Kim, Hak-Mun
    • Geotechnical Engineering
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    • v.12 no.4
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    • pp.5-20
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    • 1996
  • In this study it was analyzed by 2-D FEM and 3-D FEM to evaluate the ground reinforceing effect of steel pipe reinforced multi -step grouting (SPRG) technique and the behavior of ground in the vicinity using the nonlinear FEM program for the ground condition of alluvium located on the top of tunnel applied by SPRG technique. It was found that the nonlinear 3-D analysis performed better than 2-D analysis in evaluating the usefulness of the SPRG technique, and it was also found that the safety was relatively secured by the stiffness of steel pipe to distribute the concentrated stress in the tunnel faceing. It was reported that the change of settlement on the top of tunnel becomes about 40% of the total expected settlement before tunnel faceing reaches tunnel gauging point, and 60% of the total expected settlement while tunnel facing passes tunnel gauging point and takes a distance about tunnel diameter. With the aid of the SPRG technique the control range of displacement and stress of the ground in the vicinity could be reached up to tunnel top, namely depth ratio from 0.38 to 0.83 or 2D(D : tunnel diameter) before the tunnel facing, and about 20% of settlement control in this particular case was possible.

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Hydration Heat Analysis of Wall according to Placement Length (벽체 타설길이별 수화열 해석)

  • 김태홍;하재담;유재상;이종열;권영호;배수호
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.11a
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    • pp.301-304
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    • 2003
  • Nowadays, hydration heat analysis using FEM is common in thermal crack control of concrete structure. Many kinds of general FEM programs for hydration heat analysis are used in practice. But there are some problems in this using. In this study hydration heat analysis of wall according to placement length are performed. In this results we could get two conclusions. First, general structures like wall having general geometry and construction condition have similar behavior. So it is not necessary to analysis thermal crack in every case. Second, the results of 2D analysis is possible to be applied instead of those of 3D analysis because the results of 2D analysis is similar to 3D analysis in long wall having about 15~18m or over length at 3m height.

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The Study on the Characteristic Analysis of Controlled-PM LSM for Maglev Vehicle (제어-영구자석형 자기부상열차의 특성해석에 관한 연구)

  • Lee, Ju;Chun, Yon-Do;Lee, Kwan-Seop
    • Proceedings of the KSR Conference
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    • 1998.05a
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    • pp.450-457
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    • 1998
  • Abstract - Linear Synchronous Motor has a large airgap comparing with rotary-type motor and especially, Permanent Magnet Linear Synchronous Motor(PM-LSM) which uses permanent magnet as a magnetic field, has a very large effective magnet airgap owing to permanent magnet structure. Accordingly, in case of 2-D analysis of the motor, the analysis error becomes large because leakage flux by which normal direction of the analysis region can not be considered, In this paper, the characteristic of PM-LSM for Maglev vehicle is analyzed exactly by 3-D Finite Element Method(3-D FEM). As the result, the effect of lateral-direction airgap magnetic flux density distribution on the analysis precision has been investigated and the motor characteristics according to primary motor parameter have been also made clear quantitatively. The accuracy of 3-D FEM has been confirmed by comparing the calculated results with the experimental results.

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A Study on an Operation Mode of a Rotary-type Small-scaled LIM for Railway Transit (철도차량용 회전형 축소모델 선형유도전동기의 운전모드 연구)

  • Park, Chan-Bae;Lee, Byung-Song;Lee, Hyung-Woo;Kwon, Sam-Young;Park, Hyun-June;Han, Kyung-Hee
    • Proceedings of the KSR Conference
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    • 2008.11b
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    • pp.310-315
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    • 2008
  • Authors design a rotary-type small-scaled linear induction motor(LIM) and a performance test machine before manufacturing a real-scaled LIM for a railway transit. The designed LIM is a single-sided, short primary type and its primary has 4 poles. The rated power is 10(kW). In order to analyze characteristics of the LIM, authors use a mixed 2D-3D FEM analysis. 3-D FEM analysis is used for calculating a distribution of eddy-current on the semi-caped AL-sheet of the secondary reaction. Authors calculate a correction factor of conductivity and an equivalent conductivity on the secondary AL-sheet using a normalized eddy-current. The equivalent conductivity which is calculated in this way includes a transverse edge-effect of the LIM. Authors apply the equivalent conductivity on the secondary AL-sheet of 2D-FEM model and get performance characteristics of the LIM. Basic characteristics such as thrust and normal force, input current, efficiency and power factor of the LIM have been analyzed with the variation of frequency and speed. In order to apply an air-gap control system, the variation of the basic characteristics have been analyzed with the air-gap length variation of the LIM. Finally, authors introduce an operation mode using the air-gap control system and conduct a research on feasibility of the system.

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A Study on the Design and Analysis of High Frequency Coil Shape for Contactless Power Transmission System Combined with Transfer System (이송시스템이 결합된 비접촉 전력전송 시스템용 고주파 코일 형상 설계 및 해석에 관한 연구)

  • Kim, TaeKue;Joo, ChangDae;Ahn, HoKyun
    • Journal of Korea Society of Industrial Information Systems
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    • v.26 no.1
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    • pp.41-54
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    • 2021
  • There is a difficulty in improving the working environment and technological advancement due to power supply through cables in the application of linear motors of robots and transfer systems applied in the existing manufacturing industry. We have studied the shape of the high-frequency coil for contactless power transmission system and characteristics of power conversion system, based on the magnetic field analysis of 2D and 3D, using the FEM-based physical analysis program.

Optimization and dynamic characteristics of the hybrid type vacuum pump (하이브리드 타입 진공펌프의 동특성 및 최적화)

  • Kim, Yong-Hwi;Lee, Jong-Myeong;Ahn, Byeong-Hyun;Ha, Jeong-Min;Choi, Byeong-Keun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2014.10a
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    • pp.306-310
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    • 2014
  • The purpose of this study is the stability evaluation of a vacuum pump through modal test and rotor dynamics. Eigenvalue was solved by the finite-element method(FEM) using 2D and 3D models, then the modal test result was compared with the FEM result. According to the comparison, the analysis result using the 2D was more accurate than the 3D model. Therefore, rotor dynamics was performed by the 2D model. Campbell diagram and root-locus maps, which were calculated by complex-eigenvalue analysis, were used to evaluate the stability of the rotors of the vacuum pump. And displacement solved by unbalance response analysis was compared with the minimum clearance between two rotors of the vacuum pump. Thus, the vacuum pump is assumed operated under steady state through the evaluation of the rotor dynamics.

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A study on the improvement of static characteristic In claw poled permanent magnet stepping motor (Claw Pole 영구자석형 스테핑 모터의 정특성 향상에 관한 연구)

  • Jung, Dae-Sung;Lim, Seung-Bin;Kim, Tae-Heoung;Lee, Ju;Kwon, Ho;Son, Yeoung-Gyu;Choi, Seung-Kil
    • Proceedings of the KIEE Conference
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    • 2005.07b
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    • pp.1288-1290
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    • 2005
  • This paper analyzed the characteristics of the claw pole PM step motor by using 3D FEM. As the magnetization occurs along the z-axis of the motor, it is necessary to apply 3D FEM for analysis of the claw pole PM step motor. Considering the computation time, however, the number of the analysis model is minimized by using the "Design of Experiments(DOE)". By using the "DOE", efficient analysis was able to be done. To see the effects of the design factors, the 3D FEM is applied only to the selected models. As the design factors, the teeth shape, the number of turns and the permanent magnet overhang was selected.

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