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감속비를 고려한 In-Wheel type 구동 전동기의 중량 저감 설계
이병화(Byeonghwa Lee),채승희(Sounghee Chai),권순오(Soono Kwon),홍정표(Jungpyo Hong),이정종(Jeongjong Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
This paper deals with the weight reduction design of In-Wheel type motor. Therefore, characteristic and weight of motor according to change in reduction gear ratio are examined. The weight of construction and reduction gear following the increase of gear ratio are also considered. Weight of motor is minimized by modulating the ratio of stack length and external diameter of stator. Then, In-Wheel motor geometry based on the prototype motor is optimized to get the determined parameters using response surface methodology (RSM) and Finite Element Method (FEM). Optimal design of core usage in rotor is conducted for minimizing weight of motor which has identical characteristic to prototype motor. Characteristic analysis is conducted by using equivalent circuit analysis of PM type motor. Through the presented weight of In-Wheel type motor, total weight is reduced to 25% of prototype motor.
도상화(Sanghwa Do),이병화(Byeonghwa Lee),채승희(Seunghee Chae),홍정표(Jungpyo Hong) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
This paper treats the method for reduction of torque ripple in Wound Rotor Synchronous Motor (WRSM) which is one of the alternative solution to Interior Permanent Magnet Synchronous Motor (IPMSM). The main reason for the torque ripple is mainly generated by the saturation of magnetic flux on only one side of pole shoes. Therefore, we propose a way to maintain average torque value and reduce the torque ripple by disperse the magnetic flux evenly using rotor slits and an asymmetric rotor. Optimization will be done by Response Surface Methodology (RSM). Design variables will be the length of slits and asymmetry length. An objective function will be torque ripple and a constraint is average torque value compared with the initial model. We validate it through finite element method (FEM).
점화 모델에 따른 발전용 디젤 엔진의 연소 특성에 관한 수치적 연구
서현욱(Hyunuk Suh),배재옥(Jaeok Bae),이병화(Byeonghwa Lee),한동식(Dongsik Han),전충환(Chunghwan Jeon) 한국자동차공학회 2013 한국자동차공학회 지부 학술대회 논문집 Vol.2013 No.4
The objective of this numerical study is to evaluate the results of the simulation of which ignition models are diesel and shell. Power generation diesel engine used for this study has bore of 160mm, stroke of 240mm and compression ratio of 15.2. This study contains experimental result and numerical result calculated by STAR-CD and AVL-Fire. Pressure data of AVL-Fire has a 15~20bar maximum error compared with experimental pressure data in peak pressure range. Especially, Shell ignition model has a different shape of pressure and heat release rate curve increased and decreased rapidly. NO and Soot emissions in diesel ignition model are lower than those in shell ignition model which may be due to fast combustion. Finally, replacement of ignition model causes quite different numerical results and diesel ignition model may be appropriate for diesel combustion in AVL-Fire.