• Title/Summary/Keyword: End effect

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Phase Current Magnitude Variation Method to Reduce End-Effect Force of PM Linear Synchronous Motor

  • Kim, Min-Jae;Lim, Jae-Won;Yim, Woo-Gyong;Jung, Hyun-Kyo
    • Journal of Electrical Engineering and Technology
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    • v.6 no.6
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    • pp.793-798
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    • 2011
  • Numerous methods are available for reducing the end-effect force of linear machines. Majority of these methods focus on redesigning the poles or slots. However, these methods require additional manufacturing cost and decrease the power density. The current paper introduces another approach to reduce the end-effect force. The new approach is a method of tuning the input phase current magnitudes individually. According to the proposed method, reduction of the end-effect force could be achieved without redesigning the poles/slots or attaching auxiliary poles/slots. The proposed method is especially applicable when the target motor is very expensive or will be used for a special mission, such as hauling army vehicles equipped with three single-phase inverters. The validity of the suggested method was exemplified by the finite element method with three-phase permanent-magnet linear synchronous motor.

End-Effect Compensation in Linear Induction Motor Drives

  • Satvati, Mohammad Reza;Vaez-Zade, Sadegh
    • Journal of Power Electronics
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    • v.11 no.5
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    • pp.697-703
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    • 2011
  • In this paper a control system with a high performance dynamic response for linear induction motors (LIMs) is proposed which takes into account the end-effect in both the machine model and the control system. Primary flux oriented control has two major drawbacks i.e. a lack of decoupling of the thrust and the flux and a possibility of system instability due to the end-effect. Both of these drawbacks have been dealt with in this paper. A flux estimation method is proposed to correct the flux orientation error caused by the end effect. Extensive motor performance evaluations under the proposed control system prove its superiority over conventional vector control.

A Study on the Reduction of Detent Force caused by End-Effect for Moving Coil Type PMLSM Using Auxiliary-teeth (보조치를 이용한 가동 코일형 PMLSM의 단부효과에 의한 Detent Force 저감에 관한 연구)

  • Jeong, Su-Kwon;Zhou, Jian-Pei;Lee, Dong-Yeup;Kim, Gyu-Tak
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.55 no.9
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    • pp.459-464
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    • 2006
  • The detent force by end-effect has an undesired influence on moving coil type Permanent Magnet Linear Synchronous Motor(PMLSM). So, the reduction of detent force by end-effect is especially required for the improvement of thrust characteristics. In this paper, in order to reduce detent force by end-effect, the auxiliary-teeth is installed at the end part of mover. It is also analyzed by Finite Element Analysis(FEA) and optimized by using neural network. By comparison, the detent force is reduced about 41.4[%] comparing to that of basic model.

A Study on Reducing End Effect of SLIM (SLIM의 End Effect분석 및 저감대책)

  • Im, Dal-Ho;Yoon, Sang -Baek;Kim, Tae-Hyeong;Jang, Seok-Myeong;Sin, Heung-Gyo
    • Proceedings of the KIEE Conference
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    • pp.33-35
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    • 1994
  • In Linear Induction Motor(LIM), the end effect is caused by the abrupt change in the airgap magnetic reluctance at both ends of the machina Especially, in high speed, it has an adverse effect on various characteristics of LIM such as thrust, efficiency, power factor, etc. In this paper, we analyze the end effect, and describes the method to reduce end effect essentially and decrease the secondary material cost.

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Optimal Design for Thrust and Detent Force in Inserted Core Type Slotless PMLSM with Consideration of End Effect (단부효과를 고려한 철심 삽입형 Slotless PMLSM의 추력 및 디텐트력 최적화 설계)

  • 김미용;김규탁
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.53 no.9
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    • pp.525-531
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    • 2004
  • This paper proposes inserted core type of slotless Permanent Magnet Linear Synchronous Motor(PMLSM) to improve its low thrust density. However, by inserting the core between windings of each phase, detent force is generated and it acts as thrust ripple. Furthermore, linear motors generate end effect making thrust ripple. So, this paper applies the neural network to minimize detent force and to maximize thrust. Also, sub-poles is placed at the end parts of the mover to compensate end effect. To confirm of calculation method's validity, the calculated results are compared with experimental results.

A study on the reduction of detent force by end-effect in moving magnet type PMLSM (가동 코일형 PMLSM의 단부효과에 의한 디텐트력 저감에 관한 연구)

  • Jeong, Su-Kwon;Lee, Seung-Hoon;Lee, Dong-Yeup;Kim, Gyu-Tak
    • Proceedings of the KIEE Conference
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    • pp.115-117
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    • 2006
  • The detent force by end-effect has a bad influence on moving coil type Permanent Magnet Linear Synchronous Motor(PMLSM). So, the reduction of detent force by end-effect is especially required for improvement of thrust characteristics. In this paper, in order to reduce detent force by end-effect the auxiliary teeth is installed at the end part of mover and it is optimized by using neural network.

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Verification of 1-d direct solution for longitudinal end effect occurred in linear induction motor by using 2-d FEM (2차원 유한요소해석을 통한 선형 유도전동기의 종방향 단부효과 고려를 위한 1-d direct solution의 검증)

  • Lee, Sung-Gu;Ham, Sang-Hwan;Lee, Hyung-Woo;Lee, Ju
    • Proceedings of the KSR Conference
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    • pp.978-983
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    • 2009
  • This paper analyzed longitudinal end effect occurred in linear induction motor by using I-d direct solution and its result is verified by 2-d Finite Element Method(FEM). Longitudinal end effect of linear induction motor caused by magnetic discontinuity in primary core and electric discontinuity in armature winding has been investigated by many researchers. In this paper, 1-d direct solution and boundary conditions proposed by Yamamura and Nasar is used to analyze end effect of linear induction motor and its solution is verified by 2-d FEM.

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Detent force minimization caused by end effect of moving magnet type Slotless PMLSM (Moving magnet type Slotless PMLSM의 end effect에 의한 detent force 최소화)

  • Kim, Mi-Yong;Ha, Tae-Wook;Jung, Chun-Gil;Kim, Gyu-Tak
    • Proceedings of the KIEE Conference
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    • pp.33-35
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    • 2003
  • This paper proposes inserted core type of slotless Permanent Magnet Linear Synchronous Motor(PMLSM) to improve its low thrust density. However, by inserting the core between windings of each phase, detent force is generated. Furthermore, linear motors have the feature of structurally limited length. So, it causes the end-effect in actual operation. So, this paper applies the neural network to this model to minimize detent force and maximize thrust. Also, sub-poles used the to the end parts of the mover for compensating the end-effect.

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Studies on the Factors Influencing the Growth of Swine Testicle Cells and the END Effect of Hog Cholera Virus (우혈청(牛血淸)(분획(分劃))의 돈정소세포(豚精巢細胞) 발육(發育)과 돈(豚)콜레라 바이러스 END효과(效果)에 미치는 인자(因子)에 관한 연구(硏究))

  • Jeon, Yun-seong
    • Korean Journal of Veterinary Research
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    • v.26 no.2
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    • pp.265-276
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    • 1986
  • The bovine serum factor influencing the growth of swine testicle (ST) cell and the END effect of hog cholera SN test was studied. Throughout the experimental studies. following results were obtained and summarized. 1. Bovine whole serum of 16(76.2%) and 4(19.0%) samples out of 21 have shown a positive ST cell growth and the END effect, respectively. However, all of 21(100%) and 8(38.1%) samples out of 21 serum supernatant fractions, prepared from the bovine whole serum, have shown positive ST cell growth and END effect, respectively. 2. In the SDS-polyacrylamide gel electrophoretic analysis of the bovine whole serum and the supernatant fractions, ST cell growth inhibiting factor was proved present in globulin fraction and in whole gel plate as a diffusible component. 3. The END ineffective component present in the whole serum and its supernatant fraction was proved to be BVDV neutralizing antibody. 4. The difference of osmolarity, optical density, pH, degree of precipitant formation following heat cold treatment, A/G ratio as we11 as electrophoretic pattern and NDV SN index of the samples were not correlated to the degree of 57 cell growth and to the END effectiveness.

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Optimization of outer core to reduce end effect of annular linear induction electromagnetic pump in prototype Generation-IV sodium-cooled fast reactor

  • Kwak, Jaesik;Kim, Hee Reyoung
    • Nuclear Engineering and Technology
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    • v.52 no.7
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    • pp.1380-1385
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    • 2020
  • An annular linear induction electromagnetic pump (ALIP) which has a developed pressure of 0.76 bar and a flow rate of 100 L/min is designed to analysis end effect which is main problem to use ALIP in thermohydraulic system of the prototype generation-IV sodium-cooled fast reactor (PGSFR). Because there is no moving part which is directly in contact with the liquid, such as the impeller of a mechanical pump, an ALIP is one of the best options for transporting sodium, considering the high temperature and reactivity of liquid sodium. For the analysis of an ALIP, some of the most important characteristics are the electromagnetic properties such as the magnetic field, current density, and the Lorentz force. These electromagnetic properties not only affect the performance of an ALIP, but they additionally influence the end effect. The end effect is caused by distortion to the electromagnetic field at both ends of an ALIP, influencing both the flow stability and developed pressure. The electromagnetic field distribution in an ALIP is analyzed in this study by solving Maxwell's equations and using numerical analysis.