• Title, Summary, Keyword: Electrical property

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Finite Element Analysis of BLDC Motor Characteristic according to Magnetic Property Measurement Methods (자성 측정 방법에 따른 BLDC 전동기의 전자계 특성해석)

  • Kim, Ji-Hyun;Ha, Kyung-Ho;Kwon, Oh-Yeoul;Cha, Sang-Yoon;Kim, Jae-Kwan
    • Proceedings of the KIEE Conference
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    • pp.697-698
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    • 2008
  • This paper deals with finite element characteristic analysis of brushless DC motor according to magnetic property measurement methods. Magnetic property data for non-oriented (NO) electrical steel for electric motors are measured by the Epstein test which is considered as the international standards. Data from Epstein test may result in discrepancy from motor characteristic tests due to innate anisotropic property of NO electrical steel. Finite element analysis were performed for a BLDC motor by various measurement methods such as Epstein test, Ring test and single sheet test (SST), and calculated results were compared with considering anisotropic property conditions.

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Effect of Plasma Surface Treatment on Electrical and Mechanical Properties of Poly(ethylene terephthalate ) Film (플라즈마 표면처리가 Poly(ethylene terephthalate) 필름의 전기적 및 기계적 성질에 미치는 영향)

  • 임경범;이덕출
    • Journal of the Korean Society of Safety
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    • v.16 no.3
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    • pp.61-67
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    • 2001
  • In this study the electrical and mechanical characteristics of PET films ore analyzed after plasma surface treatment. After plasma treatment, the surface potential decay, surface potential and dielectric property were evaluated to analyze the electrical insulating property, and the tensile strength was measured as the mechanical characteristic. When plasma treatment was conducted for less than 10 minutes, it was found that the electrical insulating property was improved through evaporation of low molecular weight materials md cleaning of surface. However, for more than 10 minutes, the insulating property of plasma treated PET films was decreased due to excessive discharge energy. The tensile strength was hardly changed by Plasma treatment.

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Preparation and Characteristics of High Voltage Liquid Silicone Rubber by Modified Cross-linking Agent

  • Jung, Se-Young;Kim, Byung-Kyu
    • Transactions on Electrical and Electronic Materials
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    • v.10 no.1
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    • pp.9-15
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    • 2009
  • There is a growing demand for a high voltage silicone rubber composite with high mechanical property and high electrical property. The effect of modified cross-linking agent on the mechanical, electrical properties, and short-circuit test performance of silicone rubber insulators have been investigated. To use base polymer, the various silicone polymers were prepared by the equilibrium polymerization. Aluminum trihydrate surface was treated by vinyl silane. Liquid silicone rubber nanocomposite was prepared from the compounding of VPMPS, HPDMS, catalyst, and alumina trihydrate modified with 1,3,5-trivinyl-l,3,5-trimethylcyclotrisiloxane. The mechanical property and electrical property for insulation materials were measured, indicating the high tensile strength and the good short-circuit property.

Application of Taguchi's Robust Design Method in Optimization of Measuring Electrical Properties on Acupoints: A Pilot Study (Taguchi 실험계획법을 이용한 경혈점의 피부전기특성 최적화조건 선정 : A Pilot Study)

  • Nam, Tong-Hyun;Shin, Sang-Hoon
    • Korean Journal of Acupuncture
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    • v.25 no.3
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    • pp.15-27
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    • 2008
  • Objectives : The objective of the current study is to optimize an acupoint electrical property measurement system by using the procedures and strengths of the Taguchi method. Methods : Taguchi method was applied in the optimization of the acupoint electrical property measurement system, as in the following steps: (1) determine evaluation index; (2) execute the 1st gage R&R; (3) identify controllable and uncontrollable factors; (4) design Taguchi crossed array layout; (5) execute experiments according to trial conditions; (6) analyze testing results; (7) determine optimum run; (8) execute the 2nd gage R&R; (9) confirm optimum run. Results : The results showed that electrodes with larger diameter and efferent electric current, with music played, can produce the larger different electrical conductivity between the acupoints and the non-acupoints under various conditions. Taguchi process optimization improved repeatability and reproducibility of the acupoint electrical property measurement system. Conclusions : In the optimized condition, repeatability and reproducibility of the acupoint electrical property measurement system was acceptable.

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Study on Electrochemical Sensing Property of Harbor Pollutants using Viologen Derivative (Viologen 유도체를 이용한 항만오염물질의 전기화학적 센싱 특성 연구)

  • Park, Sang-Hyun;Lee, Dong-Yun;Kwon, Young-Soo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.119-120
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    • 2008
  • In this paper, viologen derivative is used as charge transfer material to develop sensors for detecting the organic pollutants which are the main reason of harbor pollution. We fabricated self-assembled monolayers of viologen derivative on gold electrode of QCM and investigated an electrochemical behavior property. We also determined electrochemical sensing property about environmental pollution materials such as bezene, phosphate and surfactant through quantitative and qualitative analysis of charge transfer using intrinsic property of viologen derivative by temperature and concentration change. From the achieved results, we can apply and develope the detecting sensors for harbor pollutants.

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Properties of Superconducting wires for Neutron Irradiation (중성자 조사를 위한 초전도 선재의 기초 물성)

  • Lee, Sang-Heon;Choi, Yong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.243-244
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    • 2007
  • The improvement of critical current property as well as the mechanical property is important for the application. The improvement of the critical current can be achieved by forming the nano size defect working as a flux pining center inside the superconductor. The nano size defect can be effectively formed by using neutron iradiation. All properties of most of materials after irradition become bad On the contrary, the critical current property of the superconductor is largely improved after irradiation.

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100W급 LED 보완가로등 직하조도 최적화를 위한 LightTools Simulation 분석

  • Sin, Ik-Tae;Jo, Ju-Ung;Yang, Jong-Gyeong;Park, Dae-Hui
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.164-164
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    • 2009
  • This paper had analyzed property of LED chip which has appropriate distribution and had designed modeling in order to experiment optical property of LED module through simulation. also throughout error value between street light and simulation data, precisive simulation could be inferred. as a consequent, transformation of optical property had henceforth verified the first value of module array.

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A Theory on the Construction of Binary Sequences with Ideal Atutocorrelation

  • No, Jong-Seon;Yang, Kyeong-Cheol;Chung, Ha-Bong;Song, Hong-Yeop
    • Journal of Electrical Engineering and information Science
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    • v.2 no.6
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    • pp.223-228
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    • 1997
  • In this paper, we present a closed-form expression of binary sequences of longer period with ideal autocorrelation property in a trace representation, if a given binary sequence with ideal autocorrelation property is described using the trace function. We also enumerate the number of cyclically distinct binary sequences of a longer period with ideal autocorrelation property, which are extended from a given binary sequence with ideal autocorrelation property.

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A Study on the Convergency Property of the Auxiliary Problem Principle

  • Kim, Balho-H.
    • Journal of Electrical Engineering and Technology
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    • v.1 no.4
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    • pp.455-460
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    • 2006
  • This paper presents the convergency property of the Auxiliary Problem Principle when it is applied to large-scale Optimal Power Flow problems with Distributed or Parallel computation features. The key features and factors affecting the convergence ratio and solution stability of APP are also analyzed.

A study on the surface change of MgO by discharge in AC PDP (방전시간에 따른 MgO 표면층의 변화에 관한 연구)

  • Ji, S.W.;Yeo, J.Y.;Kim, D.H.;Park, C.H.;Cho, J.S.
    • Proceedings of the KIEE Conference
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    • pp.1764-1766
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    • 1998
  • One of the most important problems in the development of AC PDP is to make long life and more stable panels. It is well known that the life time of a panel strongly depends on the sputtering-resistant property of the protecting layer such as MgO. However, the sputtering rate is so low that it is very difficult to measure the sputtering-resistant property of MgO. This paper describes a high speed measurement technique to test the sputtering-resistant property of MgO thin film by the R.F. magnetron sputtering. In this case the MgO sample has been used as a target of sputtering process. Moreover, the MgO surface changed by ion-bombarding sputtering are also discussed with SEM photoes.

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