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최지훈(Jihoon Choi),서영택(Youngtaek Seo),김래겸(Laekyeom Kim),김남규(Namkyu Kim) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
Recently, vehicles have been equipped with many electric equipment components according to safe, convenient, and environmental requirements. To meet the requirements, development of easy to control, durable, and miniaturized electrical components is essential. Therefore, the CVVD (Continuous Variable Valve Duration) actuator, which produces driving force in the new CVVD system under development, is applying the BLDC (Brushless Direct Current) motor. Requirements as automotive parts were analyzed and verified through numerical method and experiments to apply BLDC motors. For this purpose, the required torque, temperature conditions and vibration conditions of the product are clearly identified and reflected in the product design. In particular, it was developed with characteristics as smart actuators. As a result, basic performance such as response time was satisfied and achieved the required performance at last.
최영철(Youngchul Choi),김철호(Chulho Kim),이현채(Hyunchae Lee),서영택(Youngtaek Seo),한용운(Youngoun Han),송정일(Jungil Song) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.6
In this study, a small wind turbine airfoil specialized for national wind condition was designed in order to develop the furling control type HAWT. And then a flow analysis was carried out based on the blade drawing which was designed to characterize of the developed airfoil. The result of the flow analysis showed that the torque on the 3 blades was 180.23N.m. This is equivalent to an output power of 5.66kw and an output efficiency of 0.44. Then we produced and constructed a 3㎾ - furling control type HAWT by getting the system unit design technology such as the specialized furling control device. By operating this turbine, we could get 3㎾ of the rated power at a wind speed of 10.5㎧ through the ability test. Cut-in wind speed was 2㎧, generator efficiency was 92% at the rated power output. Sound power level was 87.2㏈(A). Also we observed that the output power was limited to 10.5㎧ with furling system operation.