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도시·광역철도의 가·감속 성능향상을 위한 하이브리드형 견인시스템의 개념 설계 및 적용 타당성 분석
정거철,박현준,이형우,이주 한국철도학회 2019 한국철도학회논문집 Vol.22 No.4
This paper is a conceptual design and application feasibility analysis of a hybrid traction system forimprovement of acceleration and deceleration performance of urban and metropolitan railway. Due to economic developmentin the metropolitan area, the commuting time and scheduled speed have decreased. This has greatly reducedspeed competitiveness and significantly reduced the modal share rate. To solve these problems, a study was conductedto improve the performance of acceleration and deceleration as a means of express service of urban and metropolitanrailway. A conceptual design of a hybrid type traction motor, which can be applied to both the motor car and trailer carfor enhanced acceleration and deceleration, was carried out. A permanent magnet synchronous motor with better efficiencyand output density than those of an induction motor is applied to the motor car and a linear induction motor issuggested for application to the trailer car. In conclusion, the proposed hybrid type traction motor, which converts allcars to motor cars, improve the acceleration and deceleration performance.
저상트램용 2중 회전자 구조 영구자석형 동기전동기의 기어비 변경에 따른 특성 비교 연구
정거철,이형우,이재범,박찬배 한국철도학회 2020 한국철도학회논문집 Vol.23 No.7
최근 철도 분야에서는 철도차량의 경량화 및 저상화에 대한 요구가 증가하고 있으며, 이에 따라, 철도 차량용 구동 장치의 소형경량화 관련 연구가 활발히 진행되고 있다. 따라서, 철도 차량용 구동 장치 분야에서도 기존 시스템 대비 유지 보수성 및 출력 밀도를 증가시킬 수 있는 새로운 기술 개발의 필요성이 대두되고 있으며, 2중 회전자 구조의 영구자석 동기전동기(Dual-rotor permanent magnet synchronous motor, 이하 DR-PMSM)는 이를 충족시킬 수 있는 새로운 후보 기술 중 하나이다. 특히, 저상트램의 경우, 저층 대차에서는 구동 장치를 설치하기 위한 공간이 부족하기 때문에 DR-PMSM의 적용이 유리하다. 따라서, 본 논문에서는 구조적으로 마그네틱 기어의 기능을 내포하고 있는 DRPMSM을 저상트램 구동 장치에 적용하기 위한 설계 기법 연구를 다룬다. 추가적으로 설계 파라미터의 조합에 따른 축소형 1kW급 DR-PMSM 설계 모델을 3가지 도출하고, 전자기적 유한요소분석(FEA)을 적용하여 도출된 설계 모델의 특성을 비교 분석하여 설계 기법의 유효성을 검증한다.
철도 분기기의 설빙 방지를 위한 유도방식 히팅 장치의 특성 분석 연구
정거철(Geochul Jeong),지우영(Woo-Young Ji),김진출(Jin-Chul Kim),박찬배(Chan-Bae Park),이재범(Jae-Bum Lee),이주(Ju Lee),이형우(Hyung-Woo Lee) 대한전기학회 2020 전기학회논문지 Vol.69 No.10
In this paper, a study was conducted on an induction type heating device to remove snow and ice that may cause obstacles and malfunctions of the railway switch. In the induction heating device, an ohmic loss is the heat source. Ohmic loss and heat transfer change greatly depending on the shape and material of the heating device and condition of the atmosphere. Since the loss must be accurately calculated to conduct the thermal analysis properly, it is necessary to analyze the electromagnetic and thermal characteristics and to interlock of electromagnetic and thermal analysis. Therefore, the electromagnetic and thermal analysis was conducted using finite element method (FEM). By the performance test of the prototype, verification of the simulation was conducted.
도시철도차량용 IPMSM의 Magnet Segment 변화에 따른 특성 분석에 관한 연구
정거철(Geochul Jeong),박찬배(Chan-Bae Park),정태철(Taechul Jeong),이주(Ju Lee) 대한전기학회 2015 전기학회논문지 Vol.64 No.10
The following study carried out the characteristic analysis based on the magnet segment of Interior Permanent Magnet Synchronous Motor(IPMSM) for the urban railway vehicles. IPMSM affects the electromagnetic characteristics through the change in magnetic flux based on the rotor structure, and significantly influences the structural features through the change of pressure. Therefore, satisfied by the demanded traction force of the IPMSM, magnet segment derived three different model types. The 1-segment PM model consisted an undivided permanent magnet. The 2-Bridge model consisted a divided permanent magnet with the application of Bridge. The 3-Bridge model consisted additional dividing with one more Bridge applied. The electromagnetic characteristics of the three models were compared and analyzed along with the structural features regarding the scattering of permanent magnet based on strong centrifugal force from the rotation of the rotor at high speed. In conclusion, the final model with electromagnetic characteristics and structural features most suitable of IPMSM for the urban railway vehicles was derived, and the effectiveness was verified through the characteristic experiments after the production of the derived model.
무가선 트램용 마그네틱 기어 설계 및 경향성 분석을 통한 토크 리플 저감 연구
정거철(Geochul Jeong),김현진(Hyun-Jin Kim),김성열(Sung-Yul Kim),이형우(Hyung-Woo Lee),이주(Ju Lee) 한국철도학회 2016 한국철도학회 학술발표대회논문집 Vol.2016 No.10
본 논문은 무가선 트램용 마그네틱 기어 설계 및 경향성 분석을 통한 토크 리플저감에 관해 연구하였다. 무가선 트램은 견인전동기로부터 기계식 기어를 통해 휠에 회전력이 전달되어 기계적인 마찰로 인해 마모, 파손 등 많은 단점이 있다. 하지만 마그네틱기어는 기계적인 접촉이 없어서 아주 적은 소음, 진동과 유지 보수가 필요 없다. 그리고 에너지 밀도가 높은 희토류계 영구자석을 사용하여 효율을 높일 수 있다. 그러므로 본 논문에서는 무가선 트램용 견인전동기의 설계 사양에 기존 기어비를 적용하여 마그네틱 기어의 설계 모델을 도출하였고, 극수에 따른 모델을 전자장 유한 요소법을 이용하여 특성분석을 수행하였다. 또한, 민감도 분석을 통해 토크 및 토크 리플에 가장 큰 요인이 되는 인자를 선정하였고, 경향성 분석을 통해 토크 리플을 줄이는 연구를 수행하였다. This study was conducted to find a way of reducing torque ripple by designing a magnetic gear for a Wireless Tram and analyzing its tendency. A Wireless Tram is driven by torque, which is conveyed to a wheel through a mechanical gear from a traction motor and a mechanical gear has a lot of shortcomings including wear and damage due to mechanical friction. But unlike a mechanical gear, a magnetic gear doesn’t have mechanical contact. This creates a very low noise and maintenance isn’t required. This can improve efficiency by using a rear-earth permanent magnet with high energy density. Therefore, in this study, a design model of a magnetic gear was extracted by applying the existing gear ratio to the design specification of a traction motor for a Wireless Tram and characteristics of a pole number-based model were analyzed using the electromagnetic finite element method. Moreover, the biggest factor of torque and torque ripple was selected through sensitivity analysis and tendency analysis was carried out to reduce torque ripple.
기어 특성을 고려한 전기철도용 마그네틱 기어 일체형 영구자석 전동기의 성능 분석
정거철(Geochul Jeong),정동훈(Dong-Hoon Jung) 대한전기학회 2021 전기학회논문지 Vol.70 No.3
This paper is a research paper on the performance analysis of magnetic gear integrated permanent magnet motor for electric railways considering gear characteristics. In the current industry, the drive system consists of mechanical gear and motor, which reduce or decrease the mechanical output speed of the motor by slowing down the mechanical output speed of the motor. However, mechanical gear have disadvantages such as maintenance costs and noise and vibration due to the wear of contact teeth, and the combined mechanical gear and motor driving systems are very complex in structure. Furthermore, research on contactless magnetic gear is actively underway to compensate for the shortcomings of these mechanical gear, but the driving system still has a complex structure with gear and motor coupling. Therefore, these driving systems need to be simplified, and in high-capacity driving systems, such as commercial and railway vehicles, which require high-torque at low speeds, mechanical gear and motor are integrated and lightweight. In this paper, we propose a magnetic gear integrated permanent magnet motor that can be structurally simplified and lightweight compared to conventional driving systems, and performance analysis on magnetic gear integrated permanent magnet motor considering gear characteristics. In conclusion, we propose a model of a magnetic gear integrated permanent magnet motor with high performance characteristics.
고속열차의 공기저항 저감을 위한 SD플라즈마 액추에이터의 특성 실험
정거철(Geochul Jeong),노슬기(Seulgi Roh),이병송(Byungsong Lee),이준호(Junho Lee),박찬배(Chanbae Park),이수길(Sugil Lee),이형우(Hyungwoo Lee) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.5
본 논문에서는 고속열차의 공기저항 저감을 위해 열차에 부착할 SD(Sliding Discharge)플라즈마 액추에이터를 설계한 후 유속 측정 실험을 했다. 풍동 시험에 적용하기 위해 전두, 중간, 후미부에 알맞은 액추에이터의 크기를 선정 후 설계했다. 액추에이터 전체 폭(40mm), 상부 전극의 폭(5mm)은 임의로 정하고 유전체 두께도 전압 세기를 고려해 0.6mm로 정했다. AC/DC 전압, 주파수, 상부 전극의 간격을 변수로 설정하고 변수 조건마다 유속을 측정했다. 특정 상부 전극의 간격에서 유속의 최고치를 측정할 수 있었다. 이 때 조건을 토대로 SD플라즈마 액추에이터를 여러 개 연결해서 구동시키면 더 빠른 유속이 발생될 것으로 기대된다. In this paper, after design of SD(Sliding Discharge) plasma actuator that is attached to the train to reduce air resistance of high-speed trains the flow velocity measurement were experiment. After select the appropriate size of the actuator to frontal, middle, and aft in order to be applied to the wind tunnel test were designs. Actuator full width(40mm) and width of the upper electrode(5mm) set arbitrarily, and to the 0.6mm thickness of the dielectric by considering the intensity of the voltage was set. Variable to the AC/DC discharge voltage, frequency, and upper electrode interval is set each variable condition were measured flow velocity. Peak of flow velocity from the specific upper electrode interval could be measured. At this time, When drive by connecting multiple SD plasma actuator based on conditions of the fastest flow velocity is expected to be occurs faster flow velocity.