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임정윤(Jungyoon-Lim),강태준(Tae-June Kang) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
Currently, Electrification is the biggest trend in the global automobile market. Electric vehicles replace traditional internal combustion engines, where an electric motor generates traction. As electrification progresses in the automobile market, the development of electric vehicles in various segments is necessary. It is necessary to develop a driving motor with high efficiency and output for such electric vehicles. In order to achieve this, the improvement of the power density and the increase of the cooling performance are important points. The conventional driving motor for electric vehicles used a stator using a round wire. For higher performance, a hairpin stator using a square coil was developed. This improves the fill factor of the coil, and high efficiency and output can be obtained. Compared to the round wire stator, the hairpin stator has superior cooling efficiency and is suitable for mass production because of its excellent productivity. Another important point of electric vehicles is the use of high voltage. High voltage can increase charging efficiency, and can increase output and power density. This study is about the design of a high-voltage, high-fill-factor hairpin stator.
전제경(Jei Gyeong Jeon),강태준(Tae June Kang) 대한기계학회 2018 大韓機械學會論文集A Vol.42 No.1
셀룰로오스 나노섬유는 식물의 세포벽을 구성하는 셀룰로오스 마이크로 섬유를 화학적, 기계적 방법으로 박리하여 추출된 종횡비가 큰 결정성 나노섬유이다. 본 연구에서는 수중대향충돌법으로 제조된 셀룰로오스 나노섬유 현탁액을 진공여과법과 열압착 공정을 통해 각각의 나노섬유가 임의 배향으로 적층된 나노종이를 제작하였고, 기계적, 열 안정성 그리고 광학적 물성에 대해 평가하였다. 제작된 나노종이는 나노섬유의 높은 결정도와 표면 수산기 사이의 수소결합에 의해 우수한 기계적 물성(인장강도 120 MPa, 탄성계수 7.1 GPa)과 열 안정성(열분해 온도 304℃)을 나타내었다. 광학적 물성의 경우 가시광선 영역에서 높은 투과도(95% @ 550 nm)와 연무도(97% @ 550 nm)가 동시에 나타나는 특성을 보였다. Cellulose nanofiber(CNF) is a crystalline nanofiber extracted by chemical and mechanical separation of cellulose microfibrils, which constitute plant cell walls. In this work, we prepared aqueous dispersive solution of CNFs using aqueous counter collision method. Based on the CNF solution, nanopapers laminated with CNFs of arbitrary orientation were fabricated through vacuum filtration and hot-press process. The property of nanopapers, such as mechanical, thermal stability and optical properties, were investigated. The fabricated nanopapers exhibit excellent mechanical properties (tensile strength of 120 MPa, elastic modulus of 7.1 GPa) and thermal stability (thermal decomposition temperature of 304℃) due to the high crystallinity of CNF and the hydrogen bonding between CNFs. In terms of optical properties, high transmittance (95% @ 550nm) and optical haze (97% @ 550nm) we re observed simultaneously in the visible region.