• Title, Summary, Keyword: Surface Coil

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Optimization of Voice Coil Motors for a Small Guided Missile Fin Actuator (소형 유도무기 날개 작동기용 보이스 코일 모터의 최적 설계)

  • Lee, Choong Hee;Kim, Gwang Tae;Lee, Byung Ho;Cho, Young Ki
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.47 no.1
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    • pp.59-65
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    • 2019
  • In this study, optimal design of direct-drive VCMs (Voice Coil Motor) for a missile fin actuator is carried out. The torque performance and the characteristics of the VCM are predicted by commercial electromagnetic analysis software, ANSYS Maxwell. The optimal design is obtained at the minimum and maximum actuating angles where the aerodynamic load acting on the fin is the largest in the operating range. The critical variables of the actuator is designed and the RSM (Response Surface Method) is used for the optimization. The response surface model consists of second-order functions and its experimental points are selected by a central composite design. This design is widely used for fitting a second-order response surface. The adjustment regression coefficients is computed for adequacy checking of the response surface model. Finally, the torque values obtained by the RSM and the ANSYS Maxwell are shown in good agreement.

Separation of Surface Treatment on Carbon Steel by Using Multi-Frequency Eddy-Current Testing (다중주파수 와전류 탐상을 이용한 탄소강의 표면 처리 분류)

  • Kim, Jong Min;Kwon, Chan Wool;Kim, Hak-Joon;Song, Sung-Jin;Lee, Hyung-Ho;Jung, Sang-Hwa;Kwon, Sung-Duk
    • New Physics: Sae Mulli
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    • v.67 no.3
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    • pp.338-344
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    • 2017
  • Surface treatment is an important technique applied to engineering materials to achieve reliable mechanical properties. In this study, multi-frequency eddy-current testing was applied to separate different surface treatments on carbon-steel-based specimens. The impedance of the coil measured by using multi-frequency eddy-current testing differed with the type of surface treatment used on the specimen. This is because eddy-current testing detects changes in the electromagnetic properties of the target's surface, such as a drop in the electrical conductivity during the hardening process and formation of a discontinuity layer during the coating process. Multiple experiments were conducted to obtain probability distributions of the coil's impedance, and the sensitivity of the experiment was evaluated. Additional coil probes were fabricated to enhance sensitivity, and the probes having higher resonant frequencies showed improvements. The enhanced result clearly separated all given treatment conditions for the prepared specimen.

Reheating Process of Particulates Reinforced Metal Matrix Composites for Thixoforming (Thixoforming을 위한 입자강화형 금속복합재료의 Reheating 공정)

  • 이동건;안성수;강충길
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.218-223
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    • 2000
  • A both mixing process of electro-magnetic stirring and mechanical process technique were used to fabricate particulate metal matrix composites(PMMCs) for variation of particle size. The PMMCs were tested for their tensile test for with and without heat treatment with T6. PMMCs fabrication processing conditions for both electrical and mechanical process are also suggested. In order to thixoforming of PMMCs, fabricated billet are reheated by using the optimal coil designed as a function of length between PMMC billet and coil surface, coil diameter and billet length. The effect of reinforcement distribution on billet temperature variation are investigated with calculated solid fraction theory proposed as a function of matrix alloy and volume fraction of reinforcement.

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Characterization of a Micro Power Generator using a Fabricated Electroplated Coil Measured at Low Frequency (금도금 방법으로 제작한 코일을 이용한 초소형 발전기의 저주파 진동 특성분석)

  • Lee, Dong-Ho;Kim, Seong-Il;Lee, Yoon-Pyo;Baek, Chang-Wook
    • New & Renewable Energy
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    • v.2 no.3
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    • pp.10-14
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    • 2006
  • We have designed and fabricated coil structures by gold electroplating technique. The thickness, width, and length are $7{\mu}m,\;20{\mu}m$, and 1.6m, respectively. With vibrating a magnet on the surface of a fabricated electroplated coil, the micro power generator produce an alternating voltage. We have changed the vibrational frequency from 0.5Hz to 8Hz. The generated voltage was 106mV at 3Hz and 198mV at 6Hz. We have rectified and stepped up the input voltage using a quadrupler circuit. After using the step up circuit, the measured voltage was 81mV at 3Hz and 235mV at 6Hz.

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An application of NN on off-line PD diagnosis to stator coil of Traction Motor (견인전동기용 고정자 코일의 off-line 부분방전 진단을 위한 NN의 적용)

  • Jeon, Yong-Sik;Park, Seong-Hee;Jang, Dong-Uk;Park, Hyun-June;Kang, Seong-Hwa;Lim, Kee-Joe
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.653-657
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    • 2004
  • In this study, PD(partial discharge) signals which occurrs at stator coil of traction Motor are acquired. these data are used for classifying the PD sources. W(Neural Network) has recently applied to classify the PB pattern. The PD data are used for the learning process to classify PD sources. The PD data come from normal specimen and defective specimens such as internal void discharges, slot discharges and surface discharges. PD distribution parameters are calculated from a set of the data, which is used to realize diagnostic algorithm. NN which applies distribution parameters is useful to classify the PD patterns of defective sources generating in stator coil of traction motor.

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Off-line PD Model Classification of Traction Motor Stator Coil Using BP

  • Park Seong-Hee;Jang Dong-Uk;Kang Seong-Hwa;Lim Kee-Joe
    • KIEE International Transactions on Electrophysics and Applications
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    • v.5C no.6
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    • pp.223-227
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    • 2005
  • Insulation failure of traction motor stator coil depends on the continuous stress imposed on it and knowing its insulation condition is an issue of significance for proper safety operation. In this paper, application of the NN (Neural Network) as a scheme of the off-line PD (partial discharge) diagnosis method that occurs at the stator coil of a traction motor was studied. For PD data acquisition, three defective models were made; internal void discharge model, slot discharge model and surface discharge model. PD data for recognition were acquired from a PD detector. Statistical distributions and parameters were calculated to perform recognition between model discharge sources. These statistical distribution parameters are applied to classify PD sources by the NN with a good recognition rate on the discharge sources.

An Application of NN on Off-line PD Diagnosis to Stator Coil of Traction Motor (견인전동기용 고정자 코일의 Off-line 부분방전 진단을 위한 NN의 적용)

  • Park, Seong-Hee;Lim, Kee-Joe;Kang, Seong-Hwa
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.18 no.8
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    • pp.766-771
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    • 2005
  • In this study, PD(partial discharge) signals which occur at stator coil of traction Motor are acquired these data are used for classifying the PD sources. NN(neural network) has recently applied to classify the PD pattern. The PD data are used for the learning process to classify PD sources. The PD data come from normal specimen and defective specimens such as internal void discharges, slot discharges and surface discharges. PD distribution parameters are calculated from a set of the data, which is used to realize diagnostic algorithm. NN which applies distribution parameters is useful to classify the PD patterns of defective sources generating in stator coil of traction motor.

Optimal design of car suspension springs by using a response surface method (반응 표면 분석법을 활용한 자동차용 현가스프링 최적화 설계)

  • Yoo, Dong-Woo;Kim, Do-Yeop;Shin, Dong-Gyu
    • Proceeding of EDISON Challenge
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    • pp.246-255
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    • 2016
  • When spring of the suspension is exerted by an external load, a car should be designed to prevent predictable damages and designed for a ride comfort. We used experiments design to design VON-MISES STRESS and K, a constant, of spring of suspension which is installed in a car as a goal level. We analyzed the result from Edison's Elastic - Plastic Analysis SW(CSD_EPLAST) by setting D, d, n as external diameter of coil, internal diameter of coil, the number of total coil respectively. The experiment design let the outcome be as Full-second order by using Box-Behnken which is one of response surface methods. Experimented and analyzed results based on the established experiments design, We found out design parameter which has desired VON-MISES STRESS and the constant K. Additionally, we predicted life time of when the external load was exerted by repeated load by using fatigue equation, and verification of plastic deformation has also been made. Additionally we interpreted a model, which is formed by optimized design parameter, with linear analysis and non-linear analysis, at the same time we also analyzed plastic deformation with the values from the both models. Finally, we predicted fatigue life of optimized model by using fatigue estimation theory and also evaluated a ride comfort with oscillation analysis.

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Control of free surface shape in the electromagnetic casting process (전자기 주조공정에서의 자유표면 형상 제어)

  • 박재일;강인석
    • 제어로봇시스템학회:학술대회논문집
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    • pp.612-615
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    • 1996
  • In the continuous casting process, molten metal contacts the mold wall and the molten metal surface is subject to the mold oscillation. The mold oscillation results in the oscillation marks on the surface of solidified steel, which has undesirable effects on the quality of slabs. In order to reduce the oscillation marks by achieving soft contact of molten metal with the mold surface, alternating magnetic field is applied to the surface of molten metal. However, if the magnetic field strength becomes too strong, the melt flow induced by the magnetic field. causes the instability of the molten metal surface, which has also the bad influence on the slab quality. Therefore, it is very important to choose the optimal position of the inductor coil and the optimal level of electric power to minimize the surface defects. In the present work, as a first step toward the optimization problem of the process, numerical studies are performed to investigate the effects of coil position and the electric power level on the meniscus shape and the flow field. As numerical tools, the boundary integral equation method(BIEM) is used for the magnetic field analysis and the finite difference method (FDM) with orthogonal grid generation is used for the flow analysis.

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Quantitative Analysis of a Steel Billet Surface Flaw Detection System by Means of a Finite Element Method

  • Bae, Sungwoo;Lee, Hongyeob
    • Journal of Electrical Engineering and Technology
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    • v.11 no.6
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    • pp.1729-1734
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    • 2016
  • The surface inspection of a steel billet is a common practice in the steel manufacturing process prior to hot rolling to produce steel wire for tire cord. This billet surface inspection is an important process because flaws on the surface may cause major failures during the product manufacturing phase. This paper presents a computer simulation based on a finite element method for a magnetic flaw detector with a function of the current intensity, the number of coil turns, and the billet proceeding speed during the production phase based on the typical condition of conventional apparatus. Based on the simulation result, the magnitude of the electromagnetic field on the surface diminished with distance from the electromagnet. In addition, the increased current intensity and the increased number of coil turns actually induced a stronger electromagnetic field on the billet surface. On the other hand, the proceeding speed of a billet in its production line had no significant effects. The result in this study may assist to reduce trial and error and to minimize the opportunity costs during the optimization process by applying the findings of this study into the operation condition in the steel billet production line.