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강승우(S.W.Kang),박신현(S.H.Park),김장목(J.M.Kim),임익헌(I.H.Lim),류호선(H.S.Ryu),김진성(J.S.Kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
The large synchronous motor for the pumped-storage plant(or SFC : Static Frequency Converter) has to be brought up to 100% rated speed and synchronized with the AC power network. Starting the motor from rest is achieved by switching current into the stator winding so that interaction between tins stator current and the rotor flux will cause the correct direction of torque to be developed so that the motor turns m the required direction. Starting ranges of the synchronous motor are divided into three regions. The first region is at standstill, the second that is called by the forced commutation is from standstill to 5-8% of rated speed, and the third, which is called by the natural commutation, is from 5-8% of rated speed to 100% rated speed So This paper describes three regions of the control techniques of the pumped-storage synchronous motor drive
[論文] 국산 가솔린 엔진용 저배기공해 System에 관한 연구
성낙원(N. W. Sung),정용일(Y. I. Jeong),박신현(S. H. Park),우세종(S.J. Woo) 한국자동차공학회 1986 오토저널 Vol.8 No.3
In this study, low emission gasoline engine system is developed utilizing an EGR valve, 3 way catalytic converter and electronic fuel injection system. EGR was controlled by a needle valve and optimized at the engine conditions. Throttle body fuel injection system is used for fueling. When the engine was operated at constant speed by the electronic engine control system with the 3 way catalytic converter, the emissions were reduced by 50 to 90% in volume depending on the engine operating conditions.
성낙원(N.W.Sung),정용일(Y.I.Jeong),박신현(S.H.Park) 한국자동차공학회 1987 오토저널 Vol.9 No.5
The control technique for an electronic engine is studied. For this study an IBM-PC and a throttle body fuel injection system are selected. The computer controls fuel injection, spark timing, exhaust gas recirculation and idle speed. Fuel injection is adjusted either by a feedback signal of a zirconia O₂ sensor or programmed logic for starting, acceleration, deceleration, warming up and idle modes. When a 3-way catalytic converter is used with the electronic engine control system, CO, THC, and NOx were reduced more than 90% simultaneously.