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가변속 연구자석 발전기의 역기전력을 이용한 센서리스 제어 구현
김덕규(Deok-Gyu Kim),엽연정(Lian-Zheng Ye),이정태(Jeong-Tae Lee),박승엽(Seung-Yub Park) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.11
The design of PMSG in variable speed turbine which needs to know the position of rotor for vector control was selected as the topic of this paper. The sensorless strategy using the back EMF estimation is used in that the turbine operated in variable speed always has a speed. The initial angle of sensorless control is detected by zero reference current control at constant control angle for synchronous reference frame. In order to operate stable sensorless control and implement the simulation of this kinds of algorithm, this paper uses PSIM 9.0 simulation tool and proper mode change algorithm between the initial angle detection mode and the sensorless angle estimation mode.
유량변화에 따른 판형열교환기의 압력강하와 내부유동 가시화에 관한 실험적 연구
황주원(Ju Won Hwang),김덕규(Deok Gyu Kim),박창용(Chang Yong Park) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
This study was carried out to measure the pressure drop and visualize the flow in the flow path between the chevron corrugated two plates in a heat exchanger. A test section was made to visualize the flow characteristics in the flow channels formed by a metal real heat exchanger plate and transparent replica of the counterpart plate. A simple closed loop test facility was made to do the experiment with the change of volume flow rate. The visualization was performed by a high speed camera with 800 fps and air bubbles were injected in the flow to visualize the flow distribution in the channels on the two plates. The measured pressure drop agreed well with the general trend of the pressure drop change with the increase of flow rate. The visualized flow patterns showed that the flow was not evenly distributed in the channels between the two plates, due to the left-sided inlet and outlet location od the flow. The flow visualization with air bubbles showed the limitation to visualize the actual flow velocity distribution on the two plates because Buoyant effect was dominant under upward flow conditions.