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김종수,조강래,Kim, J.S.,Cho, K.R. 대한설비공학회 1995 설비공학 논문집 Vol.7 No.2
The effects of duct inlet conditions on fan characteristics and upper wind velocity fields were investigated for two kinds of impellers. As the duct inlet condition, the relative positions between duct inlet and fan impeller and the size of baffle plate mounted on a duct inlet were selected. The 3-dimensional velocity components in flow fields were measured by a 5-holes pitot tube. From the results of measurements, it was found that the size of baffle plate scarecely effect on upper wind flow fields and characteristics of fan. It was also confirmed that the upper wind velocity distributions can be estimated by the potential flow field with large baffle plate at duct inlet.
김종수,강정길,Kim, J.S.,Kang, J.K. 대한설비공학회 1991 설비공학 논문집 Vol.3 No.4
Recently, automotive air conditioning system manufacturers have been made a great efforts on the system compactness and high efficiency. This growing interest comes improvements in evaporator thermal performance, one of the most important factors affecting the performance of air conditioning system. In order to improve design of compact type evaporator, this study executes performs to develop a computer program for evaporator thermal performance prediction of automotive air conditioning system. The brief summaries of this study are as follows: 1) To predict the overall thermal performance of serpentine type evaporator, the new simulating method is developed. 2) The calculations are performed as functions of oil mass concentration and refrigerant two-phase distribution at inlet manifold of evaporator. 3) The validity of this simulating program is confirmed by comparing the predicted thermal performance results to experimental results of practical available evaporator. 4) Based on these results, suggestions are made to improve the thermal performance of evaporator.
퍼지제어기를 사용한 영구자석 동기전동기의 센서리스 속도제어
김종수(J.S.Kim),조시열(S.Y.Zoo),김성환(S.H.Kim) 한국해양대학교 해사산업연구소 1998 海事産業硏究所論文集 Vol.8 No.-
In recent years there has been a significant development of permanent magnet synchronous motors. Generally, a PMSM requires rotor position sensors for commutation and current control, but they increase cost and size of the motor. So in these day, sensorless speed control methods of PMSM have been studied for several environmental conditions. Many sensorless control algorithms use voltage equation and dynamic equation of mathematically modeled PMSM. Because the controller has no information about rotor position without position sensor, the controller determines the applied voltage according to the hypothetical rotor position. And the analysis shows that the difference between actual and hypothetical voltage is proportional to the angular difference between hypothetical and actual rotor position. Therefore, self-synchronization is possible by reducing the voltage difference to zero. Futhermore, this paper uses the Fuzzy Logic Controller for robust speed control of PMSM. Simulation results confirm the validity of this control algorithm.