• Title, Summary, Keyword: End effect

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The Auxiliary Core Optimal Design of PMLSM to Reduce Detent Force by End Effect (단부효과에 의한 PMLSM의 디텐트력 저감을 위한 보조코어 최적설계)

  • Jang, Ki-Bong;An, Ho-Jin;Kim, Gyu-Tak
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.3
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    • pp.543-548
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    • 2010
  • There are produced the detent force caused by slot-teeth structures, end-effect and parallel magnetization of permanent magnet in permanent magnet linear synchronous motor. In this paper, we proposed to establish the auxiliary core for reducing detent force which is generated the discontinuity of magnetic circuits by end effect. The optimal design of the auxiliary core used a finite element analysis and design of experiment. To demonstrate the validity of the paper, the experiment results are compared with analysis ones.

A study on the speed characteristic of linear induction motor (유도형 리니어 모터의 속도특성에 관한 연구)

  • CHUNG B. H.;CHOI M. H.;CHO G. B.;BAEK H. L.;SEO J. Y.;KIM D. G.
    • Proceedings of the KIPE Conference
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    • pp.151-154
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    • 2004
  • To use the SLIM for servo system, the exact account of thrust about the initial speed is needed, but analyzing by equivalent circuit analyzing methode such as rotary induction motor, the error occurs because of the end effect. So, we applied the equivalent circuit considering the end effect of SLIM in this paper. The current control system is advanced the space vector pulse width modulation by using high arithmetic performance microprocessor such as DSP. In this paper, we use the dynamic characteristic analyzing methode that can calculate efficiently the end effect by using equivalent circuit methode in the operating SLIM system modeling and examine the output characteristics of SVPWM with PI controller.

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Dynamic response of a hinged-free beam subjected to impact at an arbitrary location along its span with shear effect

  • Zhang, Y.;Yang, J.L.
    • Structural Engineering and Mechanics
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    • v.26 no.5
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    • pp.483-498
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    • 2007
  • In case of considering the shear effect, the complete solutions are obtained for dynamic plastic response of a rigid, perfectly plastic hinged-free beam, of which one end is hinged and the other end free, subjected to a transverse strike by a travelling rigid mass at an arbitrary location along its span. Special attention is paid to new deformation mechanisms due to shear sliding on both sides of the rigid mass and the plastic energy dissipation. The dimensionless numerical results demonstrate that three parameters, i.e., mass ratio, impact position of mass, as well as the non-dimensional fully plastic shear force, have significant influence on the partitioning of dissipated energy and failure mode of the hingedfree beam. The shear effect can never be negligible when the mass ratio is comparatively small and the impact location of mass is close to the hinged end.

Cutting Characteristics in Down-End Milling with Different Helix Angles (하향엔드밀링시 헬릭스각에 따른 절삭특성변화)

  • 이영문;장승일;서민교
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.77-82
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    • 2003
  • In end milling process, undeformed chip thickness and cutting force vary periodically with phase change of the tool. Recently, a model has been proposed to simulate the shear and friction characteristics of an up-end milling process in terms of the equivalent oblique cutting to this. In the current study, the varying undeformed chip thickness and the cutting forces in a down-end milling process have been replaced with the equivalent ones of oblique cutting. And, the down-end milling characteristics of SM45C has been compared with that of the up-end milling previously presented with different helix angles.

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Calculations of Resistance and Inductance of End Ring of the Squirrel Cage Induction Motor for 2-Dimensional Finite Element Analysis (농형 유도전동기의 2차원 유한요소해석을 위한 엔드링 저항과 인덕턴스 계산)

  • Chung, H.J.;Shin, P.S.;Woo, S.H.
    • Proceedings of the KIEE Conference
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    • pp.872-873
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    • 2007
  • This paper proposes a calculating method of resistance and inductance of end ring of squirrel cage induction motor for 2D finite element analysis. The squirrel cage of induction motor consists of bars and end rings. The resistance and inductance of end ring have an effect on the result of the finite element calaculation. If the end ring were excluded from the analysis, the good result could not be obtained. Therefore, we first simulate an axisymmetric magnetodynamic analysis for the end ring, and then calculate the interbar resistance and the end ring inductance. The calculated values are put into the external circuit of 2D finite element model of the induction motor. The proposed method is verified by comparing the numerical results with the experimental ones.

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Effect of Chain Extenders on Carboxyl End Group of Polyester (쇄연장제가 폴리에스테르의 카르복실 말단기에 미치는 영향)

  • 김학용;은용수;조성호
    • Textile Science and Engineering
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    • v.36 no.4
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    • pp.267-273
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    • 1999
  • Polyester was melt-blended with three kinds of chain extenders 2,2-bis-oxazoline (Bis1), 1,3-phenylene-bis-2-oxazoline (Bis2), and polycarbodiimide (PCBI), which can react with carboxyl end group of polyester. The effects of chain extender content and mixing time on the carboxyl end group content, intrinsic viscosity and cold crystallization temperature of polyester were investigated. When less than 1.0 wt% of Bis1 was added, the carboxyl end group concentration decreased below 10 meq/kg. For the Bis2 concentration of less than 1.0 wt%, the carboxyl end group concentration was between 18~49 meq/kg. When more than 1.5 wt% of PCBI was added, the carboxyl end group concentration decreased below 10 meq/kg. The intrinsic viscosity increased and carboxyl end group concentration decreased with increasing PCBI content.

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Optimization of Cutting Force for End Milling with the Direction of Cutter Rotation (엔드밀가공에서 커터회전방향에 따른 절삭력의 최적화)

  • Choi, Man Sung
    • Journal of the Semiconductor & Display Technology
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    • v.16 no.2
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    • pp.79-84
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    • 2017
  • This paper outlines the Taguchi optimization methodology, which is applied to optimize cutting parameters in end milling when machining STS304 with TiAlN coated SKH59 tool under up and down end milling conditions. The end milling parameters evaluated are depth of cut, spindle speed and feed rate. An orthogonal array, signal-to-noise (S/N) ratio and analysis of variance (ANOVA) are employed to analyze the effect of these end milling parameters. The Taguchi design is an efficient and effective experimental method in which a response variable can be optimized, given various control and noise factors, using fewer resources than a factorial design. An orthogonal array of $L_9(33)$ was used. The most important input parameter for cutting force, however, is the feed rate, and depending on the cutter rotation direction. Finally, confirmation tests verified that the Taguchi design was successful in optimizing end milling parameters for cutting force.

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Aerodynamic Characteristics of Impulse Turbine with an End Plate for Wave Energy Conversion

  • HYUN BEOM SOO;MOON JAE SEUNG;HONG SEOK WON;KIM KI SUP
    • Journal of Ocean Engineering and Technology
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    • v.19 no.6
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    • pp.1-7
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    • 2005
  • This paper deals with the design and aerodynamic analysis of a special-type impulse turbine, with an end plate for wave energy conversion. Numerical analysis was performed using a CFD code, FLUENT. The main idea of the proposed end plate was to minimize the adverse effect of tip clearance of turbine blade, and was borrowed from ducted propeller, with so-called penetrating end plate for special purpose marine vehicles. Results show that efficiency increases up to $5\%$, depending on the flow coefficient; a higher flow coefficient yields increased efficiency. Decrease of input coefficient CAwith an end plate is the main reason for higher efficiency. Performance of end plate at various design parameters, as well as flow conditions, was investigated; the advantages and disadvantages of the presentimpulse turbine were also discussed.

A Study on Advertising Effect according to Involvement, Advertising Location and Advertising Forms - Focusing on the Fashion Internet Search Advertising - (관여, 광고위치, 광고형태에 따른 광고효과 연구 - 패션 인터넷 검색광고를 중심으로 -)

  • Je, Eun-Suk
    • The Research Journal of the Costume Culture
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    • v.20 no.2
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    • pp.251-262
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    • 2012
  • This research aimed to examine an advertising location according to consumer involvement about internet search advertising and advertising effect according to advertising forms. This research carried out a questionnaire survey from May 25, 2011 for seven days with the target of men and women at the age of 20s-30s who tried search advertising in Seoul and capital area, and 519 copies were used for final analysis. For analysis of collected materials, the reliability test, factor analysis, $t$-test, regression analysis and ${\chi}^2$ test were executed by using statistical package SPSS 16.0. The results are as follows. First, it appeared that consumer's clothing involvement, advertising involvement, advertising location and advertising forms had an influence on site attitude and clicking intention. Consumers of high clothing involvement, high advertising involvement and upper end advertising appeared to have high site attitude and clicking intention. Second, all consumers of the low and high clothing involvement and upper end advertising appeared to prefer the upper end advertising. It appeared that consumers of low advertising involvement prefer lower end advertising, and consumers of high advertising involvement prefer the upper end advertising at an advertising location according to clothing involvement. Accordingly, it is important that the search advertising exposes advertising in the upper end, and that should use an advertising phrase capable of giving trust to consumers. As the text advertising had high site attitude and clicking intention in the advertising forms, consumers should pay attention to the advertising phrase.