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컬럼 장착형 전자식 조향 장치의 모터 열-유동 특성에 관한 연구
김승중(SeungJoong Kim),이정환(Junghwan Lee),김일용(Ilyong Kim),채종영(Jongyoung Chae),박규식(Kyushik Park) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In this paper, flow and heat transfer characteristics of an brushless DC motor which is installed CMDPS(Column type Motor Driven Power Steering) are numerically analyzed three/two dimensional electromagnetic model and three-dimensional turbulence modeling. CMDPS is based on conventional steering system and it assist steering torque by motor, worm & worm wheel gear set. CDMPS motor is be heated by coil, stator core, magnet and rotor core because it is always operation and set on various situation in driving time. For the present study, parking situation is considered for boundary conditions (row RPM, high torque and natural convection at motor outside) because it is most severe heat conditions for motor. Heat loss of each parts is calculated by Maxwell and temperature characteristics are calculated Ansys and Star-CCM+.
조향시스템의 랙-피니언(Rack&Pinion) 래틀(Rattle)소음 저감에 관한 연구
한민규(Mingyu Han),김승중(Seungjoong Kim),이재용(Jaeyong Lee),김광일(Kwangil Kim),송준규(Jungyu Song),심정수(Jeongsoo Shim),길성진(Seongjin Kil) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper addresses a modification for reducing rattle noise of an CEPS(Column type Electric Power Steering) system. To simulate rattle noise of the steering system, analytical test rig including rack bar, pinion shaft, tie rods, support yoke assembly and rack housing for rack and pinion system and motor, worm wheel and worm gear for reduction system is made with ADAMS. Then, vehicle test is carried out for input data like left/right side forces, left/right vertical accelerations and handle angle to the analytical model. Analytical results and vehicle test results show a good relationship. Based on the analytical model, to reduce rattle noise of rack and pinion part, a cam-type yoke system that has a self-adjusting function is added to the analytical model. The modified system shows a good rattle performance in vehicle test as well as the analytical model.
캘리퍼 일체형 전자식 주차 브레이크의 방사소음 해석을 통한 작동소음 저감에 관한 연구
이정환(Junghwan Lee),김승중(Seungjoong Kim),채종영(Jongyoung Chae),박규식(Kyushik Park),한민규(Mingyu Han) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The purpose of this study is to minimize operating noise of Motor-on-Caliper (MoC) type Electronic Parking Brake (EPB) system. The acoustic radiation analysis model is developed based on the finite element method. This model is applied to derive an internal force from surface vibration by using an inverse load identification method and to predict the radiation noise by using a boundary element method. According to the experiments, gear meshing frequency for reduction gear is a main source of radiated noise. But, it is very difficult to find a reduction gear combination which can meets a low noise radiation and mechanical performance at the same time. Therefore, we focused on the exterior design to cut operating noise down by CAE technology. To verify the results from acoustic radiation analysis, an experiment was conducted under the same condition as numerical simulation, and their results were compared.
해석기법을 이용한 매입형 영구자석 동기 모터의 특성평가에 관한 연구
이정환(Junghwan Lee),김승중(Seungjoong Kim),김일용(Ilyong Kim),채종영(Jongyoung Chae),박규식(Kyushik Park) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
As enforced the regulation of fuel efficiency and increased the demand of green car, many interest are focused on electric vehicle and hybrid electric vehicle. Therefore, it is well known that the Interior Permanent Magnet Synchronous Motor (IPMSM) plays an important role in electric direct-drive in-wheel traction system. This study describes the simulation method to predict the mechanical characteristics which is coupled with an electro-magnetic field of IPMSM. The simulation was performed in two steps based on the finite element analysis. In the first step, electro-magnetic forces and losses versus rotation angle of rotor were calculated using 2D electro-magnetic field analysis with the current inputs given from experiments. In the second step, the resultant forces and losses were applied to the rotor and stator in order to calculate mechanical characteristics (stress, temperature distribution, etc) at the operational condition of interest using transient analysis. To verify the results from analysis, an experiment was conducted under the same condition as numerical simulation, and their results were compared.
케이블-풀러 전자식 주차 브레이크의 작동소음 저감에 관한 연구
한민규(Mingyu Han),이재용(Jaeyong Lee),김승중(Seungjoong Kim),장세인(Sane Chang) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
This paper addresses a modification for reducing operating noise of an cable-puller EPB(Electronic Parking Brake) system. Recently, as an application of EPB system in the vehicles has been broadened, drivers’ complaint about operating noise of EPB has been larger. The root cause of operating noise of EPB is comprised of 3 main factors, the first is the initial source like motor and reduction gear set, the second is transfer characteristics like rubber bush, bracket and body, and the last is resonance characteristics between the operating frequency and the system’s natural frequency. In this study, many methods like tests and CAE analysis was carried out to reduce the initial source and transfer amount of noise and vibration, and to avoid the superposition of natural frequency. Improved sound characteristics of EPB assembly in laboratory test don’t agree with improved sound result on the vehicle test. This shows interior vehicle sound result is influenced by vibration characteristics as well as sound characteristics.
냉각수 온도와 대기온도 영향에 따른 OBC내 전자부품의 온도에 관한 실험적 연구
송백기(Baikkee Song),오성민(Sungmin Oh),강재준(Jaejun Kang),김승중(SeungJoong Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
This paper discusses a temperature change of electronic components in OBC(On-board Battery Charger) according to the cooling water and the ambient temperature. Each electronic component has a temperature limit for satisfying a operating condition and a lifetime of the OBC. Thus, a power control should be optimized to prevent electronic components from overheating. As a result, to predict how much the power produced at a certain temperature condition, the cooling water temperature and the ambient temperature which are dominant factor of electronic component temperature should be defined exactly. In this reason, temperature map--power versus temperature (cooling water and ambient temperature)--is required. However, drawing a temperature map through experiment at every temperature condition is costly and time-consuming. In this paper, therefore, as analyze the temperature change of electronic component based on cooling water temperature and ambient temperature through experiment, temperature of temperature sensor which is one of the electronic components of OBC is calculated and then power at certain temperature condition can be predicted accurately. At the conclusion, actual power and calculated power are shown to validate temperature variation according to temperature conditions.