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전동휠체어용 Variable Reluctance Motor의 개발에 관한 연구
李奉燮,李英美 三陟大學校 産業科學技術硏究所 2002 産業科學技術硏究論文集 Vol.7 No.2
In this paper, the variable reluctance motor(VRM) has a simple rotor construction with no winding. It also has simple concentrated windings on the stator. Thus, it is expected to be a lower cost machine to manufacture than the squirrel cage induction motor. The main object of this paper is to predict the locked rotor torque waveforms for the VRM. The locked rotor torque for VRM has been calculated using two-dimensional FEM(Flux2d) and the results are shown in the paper.
이봉섭,박승조 동아대학교 환경문제연구소 2002 硏究報告 Vol.25 No.1
Waste activated carbon containing phenol discharged from industrial field used the samples of this study. We investigated with the physical and chemical characteristics of activated carbon regenerated by Pseudomonas putida (KCCM 11762). The results obtained from investigated the physical and chemical characteristics of regenerated activated carbon in case of pH 7. regeneration time 20 hrs and regeneration temperature 26℃, the removal efficiency of phenol was 93%, average iodine adsorbability was l082mg/g and methyleneblue decolorization power(MBDP) was 138㎖/g.
李奉燮,陳廣允,吳鴻錫 三陟大學校 2001 論文集 Vol.34 No.1
The variable reluctance motor(VRM) has a simple rotor construction with no winding. It also has simple concentrated windings on the stator. Thus, it is expected to be a lower cost machine to manufacture than the squirrel cage induction motor. However, to realize the more stable and higher backward and forward control, it is necessary to decrease the inertia of rotor. In this paper, the calculation of design parameter and magnetic flux density is performed to predict the locked rotor torque waveforms with rotor positions for the rotor shapes of the VRM. The locked rotor torque for VRM has been calculated using three-dimensional FEM(Flux3d).
이봉섭,주재현 三陟大學校 産業科學技術硏究院 2005 産業科學技術硏究論文集 Vol.10 No.-
In this study, the relation of discharge patterns with the radiated electromagnetic waves is investigated by measuring electromagnetic waves using a antenna and a spectrum analyzer. The patterns of radiated electromagnetic waves measured at the atmospheric pressure in Liquid Nitrogen(LN_(2)) during the partial discharges in nonuniform electric field depend on positive DC power. From these points of view, it is considered that these results obtained from this investigation may be used as fundamental data for diagnosis and prediction of insulation on the equipments of superconducting and cryogenic applications.
구동신호 제어기법에 의한 부하병렬형 고주파 인버터의 특성비교
이봉섭,원재선,김동희 한국조명전기설비학회 2003 조명·전기설비학회논문지 Vol.17 No.1
This paper describes the load parallel type full-bridge high frequency resonant inverter can be used as power source. Output control method of proposed circuit is compared with pulse frequency modulation(PFM), pulse width modulation(PWM) and pulse phase variation(Phase-Shift). The analysis of the proposed circuit is generally described by using the normalized parameters. The principle of basic operating and the its characteristics are estimated according to the parameters such as switching frequency(${\mu}$), pulse width($\theta$d) the variation of phase angle($\phi$) by three driving signal patterns. Experimental results are presented to verify the theoretical analysis result. In future, Characteristics by three driving signal control method is provided as useful data in case of output control of a power supply in various fields as induction heating application, DC-DC converter etc. 본 논문은 고주파 전원에 사용되는 풀 브릿지 부하 병렬형 고주파 공진 인버터 회로를 연구대상으로 하고 출력제어기법으로는 펄스 주파수 변조(PFM, 펄스 폭 변조(PWM) 그리고 펄스 위상 변화(Phase-Shift)잎 경우를 비교 검토하였다. 회로의 해석은 정규화 파라메타를 도입하여 범용성 있게 기술하였고, 인버터 특성은 3가지 구동신호패턴에 의한 스위칭 주파수($\mu$), 펄스폭($\theta$d), Phase-Shift의 위상차각($\phi$)의 변화와 제 파라메타에 따라 특성 평가를 행하였다. 실험을 통해 이론해석의 타당성을 검증하였다. 향후, 3가지의 구동신호제어기법에 의한 특성들은 유도가열 응용, DC-DC 컨버터 등의 전원 시스템의 출력제어 시에 유용한 자료로 제공될 것으로 사료된다.
이봉섭,변헌수 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
In this work, the experimental cloud-points in the binary and ternary mixtures for poly(2-phenylethyl methacrylate) [P(2-PEMA)] solutions containing supercritical solvents (i.e., carbon dioxide, propylene, 1-butene, dimethyl ether (DME)) are carried out up to 473 K and 224 MPa. According to the amount of cosolvent (i.e., DME), the cloud-point curves for ternary mixtures of P(2-PEMA) in supercritical solvents (i.e., carbon dioxide, propylene, 1-butene) show the changes from upper critical solution temperature (UCST) behavior to lower critical solution temperature (LCST) behavior. The PC-SAFT equation of state is applied to correlate the phase behaviors of all experimental systems, and the calculated results are shown as a reasonable agreement with experimental data. According to the amount of DME (i.e., cosolvent), the UCST- and LCST-type phase behaviors are described exactly by PC-SAFT EoS with one adjustable binary interaction parameter on which the effect of temperature and/or cosolvent amount is not considered.