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풍력터빈 적용을 위한 PMSG용 영구자석의 와전류손실에 관한 연구
최만수(Man-Soo Choi),문채주(Chae-Joo Moon),쑨루이(Sun Rui),장영학(Young-Hak Chang),박태식(Tae-Sik Park),정문선(Moon-Seon Jeong),곽승훈(Seung-Hun Kwak) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.2
The objective of this paper is to suggest a design topology of permanent magnet synchronous generator with 2,000kW capacities for wind turbine. The suggested topology is to provide 3 split magnet PMSG instead of single magnet, and performed an analysis of eddy current loss and iron loss for suggested type using ansoft maxwell commercial program. The simulation results of suggested magnet type show there duction of eddy current loss as 13.87kW with loadless conditions and23.48kW with rated conditions, but iron loss for rotor yoke show the in creasing trend as2.2kW with loadless conditions and 0.2kW with rated conditions. The suggested 3 split maget type is to identified as more useful for 2,000kW PMSG.
1m급 인공위성 레이저추적 시스템용 고속·고정밀 추적마운트 개발 및 예비 성능분석
최만수(Man-Soo Choi),임형철(Hyung-Chul Lim),이상정(Sang-Jung Lee) 한국항공우주학회 2016 韓國航空宇宙學會誌 Vol.44 No.11
본 연구에서는 국내 최초 개발 예정인 1m급 인공위성 레이저추적 시스템(Satellite Laser Ranging, SLR)의 추적마운트 (Tracking Mount) 모듈 개발을 위한 예비설계 및 성능분석 결과를 제시한다. 인공위성 레이저추적 시스템은 위성까지의 거리를 정밀하게 측정하는 시스템으로 지상의 관측소에서 반사경을 탑재하고 있는 인공위성까지 레이저를 발사하여 되돌아오는 레이저 사이의 시간간격을 측정하는 시스템으로서, 현존하는 인공위성까지의 거리측정 시스템 중 가장 정밀한 측정 시스템이다. 본 논문에서 제안하는 인공위성 레이저 추적 시스템용 고속·고정밀 추적마운트의 추적범위는 고도 300 km에서 정지궤도(고도 36,000 km)까지 가능하며, 레이저 반사경을 탑재한 인공위성에 대해 주·야간 레이저추적이 가능해야 한다. 이러한 요구사항을 만족하기 위해, 본 연구에서는 고속·고정밀 추적마운트기구부 설계 및 구조해석을 수행하였고, 추적마운트의 원활한 제어를 위한 모션 제어 시스템을 설계하여 예비 성능 분석을 실시한 결과를 소개하였다. This paper presents preliminary design and performance analysis of a fast and high precision Tracking Mount for 1m Satellite Laser Ranging(SLR) which is development by Korea Astronomy and Space science Institute(KASI). SLR is considered to be the most accurate technique currently available for the precise orbit determination of Earth satellites. The SLR technique measures the time of flight between pulses emitted from laser transmitter and pulses returned from satellites with laser retro-reflector array. It provides millimeter level precision of range measurements between SLR stations and satellites. A fast and high precision Tracking Mount for SLR which is proposed in this research should be capable of day and nighttime laser tracking about the satellites with laser reflectors from 200 km to 36,000 km altitude(geosynchronous orbit). In order to meet this requirement, we performed mechanical design and structural analysis for Tracking Mount. Also we designed the motion control system and conducted pre-performance analysis to obtain good performance results for a fast and high precision Tracking Mount.
풍력터빈 PM형 동기발전기의 와전류손실과 열 해석에 관한 연구
최만수(Man Soo Choi),장영학(Young Hag Chang),박태식(Tae Sik Park),정문선(Moon Seon Jeong),문채주(Chae Joo Moon) 대한전기학회 2014 전기학회논문지 Vol.63 No.11
In this paper, eddy current loss, iron loss and heat transfer of PMSG with 2,000kW capacities were analyzed for wind turbine. The PMSG with 3 split magnet was analyzed using ansoft maxwell commercial program and, generator was tested by Back to Back converter with no load condition at laboratory. Rotor surface temperature was measured by Pt100 sensors for investigating heat transfer from rotor to atmosphere. The simulation results shows 27.4㎾ eddy current loss in no load condition and 50.2㎾ eddy current loss in rated load condition with 3 split magnet, and also shows 4.3㎾ iron loss in no load condition and 7.3kW iron loss rated load condition. The heat transfer coefficient of convection between rotor surface and atmosphere was investigated by 9.6 W/㎡·K. Therefore the heat transfer from rotor to atmosphere was about 17㎾(54%) and from rotor to air-gap was about 14.6㎾(46%) in no load condition. It is identified that the cooling system for stator have to include the 46% of iron loss, and heat dissipation structure of rotor surface have to be suggested and designed for efficiency improvement of generator.
저압 증기 화합물 증착 공정에서 복사열전달 및 물질전달 해석
박경순,최만수,조형주,Park, Kyoung-Soon,Choi, Man-Soo,Cho, Hyoung-Joo 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.1
An analysis of heat and mass transfer has been carried out for multi-wafer Low Pressure Chemical Vapor Deposition (LPCVD). Surface radiation analysis considering specular radiation among wafers, heaters, quartz tube and side plates of the reactor has been done to determine temperature distributions of 150 wafers in two dimensions. Velocity, temperature and concentration fields of chemical gases flowing in a reactor with multi-wafers have been then determined, which determines Si deposition growth rate and uniformity on wafers using two different surface reaction models. The calculation results of temperatures and Si deposition have been compared and found to be in a reasonable agreement with the previous experiments.
내부제트 분사를 이용한 새로운 광섬유제조 화학증착 방법에 관한 연구
홍춘근,최만수,Hong, Choon-Keun,Choi, Man-Soo 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.4
The present study has proposed a novel aerosol CVD utilizing an internal jet in the conventional MCVD reactor for the purpose of enhancing the deposition efficiency(and rate) and the uniformity of deposited film. The use of impingement of high temperature jet through a thin inner tube ensures the reduction of non-uniform particle deposition zone as well as higher thermophoretic particle deposition. It is shown that significant improvements have been achieved for both aspects of deposition efficiency and uniformity. As jet temperatures increase, the tapered length is reduced and deposition efficiency is significantly increased.
정재인,최만수,Jeong, Jae-In,Choi, Man-Soo 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.7
A simple model for describing the non-spherical particle growth phenomena has been developed. In this model, we solve simultaneously particle volume and surface area conservation sectional equations that consider particles' non-sphericity. From the correlation between two conserved properties of sections, we can predict the evolution of the aggregates' morphology. This model was compared with a simple monodisperse-assumed model and more rigorous two-dimensional sectional model. For comparison, formation and growth of silica particles have been simulated in a constant temperature reactor environment. This new model showed good agreement with the detailed two-dimensional sectional model in total number concentration and primary particle size. The present model successfully predicted particle size distribution and morphology without costing very heavy computation load and memory needed for the analysis of two dimensional aerosol dynamics.
예혼합 평면화염에서 비구형 실리카 입자의 성장에 관한 수치해석적 연구
오세백,이방원,최만수,Oh, Se-Baek,Lee, Bang-Weon,Choi, Man-Soo 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.10
Two dimensional aerosol dynamics considering the effects of particle generation, coagulation, thermophoresis, sintering and convection has been studied to obtain the growth of non-spherical silica particles in conjunction with determining flame temperature by performing combustion analysis of premixed flat flame. Heat and mass transfer analysis includes 16 species, 29 chemical reaction steps together with oxidation and hydrolysis of SiCl4. The effect of radiation heat loss has also been included. The predictions of flame temperatures and the evolution of particle size distributions were in a reasonable agreement with the existing experimental data.