• Title/Summary/Keyword: End effect

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Study On The Travelling Magnetic Field In The Linear Induction Motor With Its End Effect Taken Into Consideration (유도형 Linear Motor의 단부효과를 고려한 이동자계에 관한 연구)

  • Dal Ho Im
    • 전기의세계
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    • v.21 no.4
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    • pp.7-14
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    • 1972
  • The author has established a general equation for the travelling magnetic field in air gap with the end effect taken into consideration, which constitutes the basics for the analysis of characteristics of linear induction motor. This equation is verified by comparison of the experimental values with the theoretically calculated values. The properties of the travelling wave with attenuation, which is contained in the travelling magnetic field of linear induction motor, have been verified, and consequently the practicable equation is established with these effects taken into consideration. This provides the solid foundation for the theoretical analysis of the characteristics of the linear induction motor.

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The Stabilized Speed Control Modeling of Single-side Linear Induction Motor Considering End-effect (단부효과가 고려된 편측형 선형유도전동기의 안정속도제어 모델링)

  • Lim, Hong-Woo;Chae, Bong;Choi, Moon-Han;Lee, Kang-Yeon;Cho, Geum-Bae;Baek, Hyung-Lae
    • The Transactions of the Korean Institute of Power Electronics
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    • v.11 no.3
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    • pp.266-273
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    • 2006
  • In difference with the rotary type electrical machinery, the single-sided linear induction motor(SLIM) that generates the direct thrust, is widely used for the operation system of electrified railroad, lope-less elevation system, conveyer system, and so on. The operational principle of single-sided linear induction motor is constructively similar to the general rotary Induction motor It Is difficult to realize the complicate linear induction motor which is applied space vector pulse width modulation(SVPWM) system, but widely used in vector motor control system or servo control system because of its high performance in current control. In this paper, we has modeled the dynamic characteristic analyzing methode, and calculated efficiently the end effect by using equivalent circuit methode in the operating linear Induction motor control system.

Performance Evaluation of Slotless Permanent Magnet Linear Synchronous Motor Energized by Partially Excited Primary Current

  • Jung, Sang-Yong;Chun, Jang-Sung;Jung, Hyun-Kyo
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.11B no.3
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    • pp.86-92
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    • 2001
  • This paper is presented for evaluating the performance of slotless Permanent Magnet Linear Synchronous Motors (PMLSM) Which is energized by partially excited primary current. Especially the influence of end-effect due to the moving magnet is investigated in detail. Also partial excitation of primary current for better efficiency and its switching behavior are suggested Capability of PMLSM which is related to speed-force feasibility judging whether motor can meet the desired specifications in the dynamics are investigated. Furthermore control characteristics of PMLSM are considered to verify the validity of dynamic capability in running condition.

Direct Thrust Control Response of Linear Induction Motor with Cage-type Secondary Considering End Effect (단부 효과를 고려한 농형 2차측을 갖는 선형 유도전동기의 직접 추력 제어 응답 특성 고찰)

  • Kim, Kyung-Min;Park, Seung-Chan
    • Proceedings of the KIEE Conference
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    • pp.15-17
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    • 2003
  • In this paper, direct thrust control(DTC) scheme is applied to a linear induction motor(LIM) with cage-type secondary. The line voltages and phase currents are detected and a thrust correction coefficient considering the end effect of the LIM is introduced in order to Improve the accuracy of thrust estimation in the DTC implementation. Experimental results for thrust and flux responses are presented.

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A study on the thrust characteristics of three phase linear induction motor by frequency variation (주파수변환에 의한 3상 선형유도전동기의 추력 특성에 관한 연구)

  • Im, Dal-Ho;Kim, Hak-Lyun;Kang, Do-Hyun
    • Proceedings of the KIEE Conference
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    • pp.73-76
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    • 1988
  • In this paper, the governing equation of the three phase linear induction motor is induced by the method that current in the primary winding is assumed as a current sheet. The steady state flux and the flux that is produced by end effect are mathematically analysed by electromagnetic equation. Each thrust of these flux is respectively induced. So in this paper, it is proved that linear motor is highly affected by end effect at high speed and speed-thrust characteristics of three phase linear induction motor are shown by frequency variation in the actual model.

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Mechanical Unbalance Characteristics Analysis of Linear Motor for Magrntically Levitated Transit (자기 부상 열차용 리니어 모터의 기계적 부펑식 생성 효과)

  • 임달호;이민명;김규탁
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.40 no.5
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    • pp.470-478
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    • 1991
  • In this study, a variety of characteristics were shown experimentally under mechanically unbalnced states expected in a practicl system that linear motor is used as a driving motor of magneticlly levitated transit and the design criterion of the linear motor has been proposed. Since, with slip being at 0.1, end effect was reduced a little to increase thrust about 6.14 percents in case thatsinusoidal current conducted 5[A] in short coil at each end of linear motor for compensation of it, if the ratio of sinusoidl current versus input currents is adjusted properly, it is thought that this method small be effective one. And if the gap of exit region is bigger than that of entry region, end effect will be reduced. As a result, more effective driving will be obtained.

Vector Control Simulation of Single Sided Linear Induction Motor (편측형 선형유도전동기의 벡터제어에 관한 연구)

  • Jeong, Byeong-Ho;Lee, Gang-Yeon;Cho, Geum-Bae;Baek, Hyeong-Lae;Choi, Chang-Ju
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.127-131
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    • 2003
  • LIM have mainly different point considering rotary induction motor, that is end effect. In this paper described that, end effect, adding to the rotary induction motor. They can designed because of affects magnetizing inductance and series resistance in the d-axis circuit. After LIM modeling, using SVPWM, apply to vector control this model. We can verify feasibility of field oriented control technology can control speed by simulation.

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A Study on the 2-Dimensional Flux Distribution Analysis of a Double Sided Linear Induction Motor (양축식 선형유도 전동기의 2차원 자속분포 해석에 관한 연구)

  • 임달호;김학린;조윤현
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.39 no.1
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    • pp.29-35
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    • 1990
  • This paper proposes a tow-dimensional magnetic flux distribution analysis of the double-sided linear induction motor(DLIM). Both the longitudinal end-effect and the transverse edge-effect, which are due to the finite length and width of the primary stator, are considered. Also each force which is due to the variation of slip frequency was computed to show the fact that the thrust force of DLIM is dependent on both the longitudinal end-effect and the transverse edge-effect. To ascertain the propriety of this analysis, the simulated results of the magnetic flux density distribution in the airgap are compared to the experimental data.

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