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스트레인 게이지를 이용한 추진축계 베어링 반력 측정에 관한 연구
김철우(C. W. Kim),이용진(Y. J. Lee),김의간(U. K. Kim) 한국마린엔지니어링학회 2005 한국마린엔지니어링학회 학술대회 논문집 Vol.2005 No.-
본 논문은 기존의 잭업에 의해 이루어졌던 추진축계 베어링 반력의 측정을 스트레인 게이지를 이용하여 잭업으로는 측정이 불가능 했던 후부 선미관 베어링의 반력을 해석하였다. 또한 선체의 조건 변화에 따른 베어링 반력 변화를 측정 및 계산하여 차후 동 선종의 선체 조건 변화에 따른 베어링 반력을 예측 할 수 있는 자료로 활용될 수 있다.
Z축 운전구조를 갖는 선형 영구자석형 동기 전동기 운전제어에 관한 연구
이진하(C.H. Lee),최철(C.Chou),박한용(H.W. Park),김철우(C.U. Kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
In this study a control system with variable gain schedule using real speed and moving direction is proposed to control a Permanent Magnet Linear Synchronous Motor (PMLSM) with Z-axis operation structure. <br/> The implementation of the controller is designed on the DSP TMS32OC32 board PMLSM is operated by using 4-point absolute positions profile with each velocity, acceleration and deceleration. The direction of the initial angle action for starting is set from the lower limit point to the upper limit point on PMLSM operation stroke The effectiveness of a control system with variable gam schedule is demonstrated by some experimental results<br/>
정현파 역기전력을 갖는 BLDC의 직접토크 제어에 관한 연구
김정수(J.S. Kim),김철우(C.U. Kim),조수억(S.E. Cho) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
This paper describe a control scheme for direct torque control of BLDC Motor. The proposed Luenberger Observer scheme calculate flux errors in order to control the torque and flux more correctly. This proposed control scheme has not the requirement of a separate current regulator and proportional-integral (PI) control of the flux and torque, there by improving transient performance and also has the advantage of less torque ripple in steady state with a fixed switching period. The effect of proposed method has been proven by simulations.
고속 고출력 영구자석 전동기 최대 출력 운전에 관한 연구
빈재구(J. G. Bin),김철우(C. U. Kim) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
ADD is under development for the high speed motor. This paper describes simulation and test results for obtaining the maximum output by leading angle of encoder. So we carried out the test for obtaining the optimum leading angle of encoder. Test results on the motor of 7 phases 6 poles were showed the validity of proposed methods and phase-leading angle.
PAM 방식을 적용한 단상 승강압형 정류기의 디지탈제어
김태진(T.J.KIM),변영복(Y.B.Byun),조기연(K.Y.Joe),김철우(C.U.Kim) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
This paper describes a digital implementation of a pulse amplitude modulation(PAM) method for a unity-power-factor buck-booster converter. A digital controller is designed and implemented by a Digital Signal Processor(DSP) to replace the analog control circuit for PAM. Experimental results are presented and compared with simulations.<br/>
김태진(T.J.Kim),변영복(Y.B.Byun),조기연(K.J.Joe),조상명(S.M.Cho),김철우(C.U.Kim) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
Joining thin aluminum alloy is difficult using most welding techniques Many of problems associated burn-through by the high heat input Common welding techniques are TIG, MIG, and MIG-PULSE welding The VP-GMA W provides more control of the heat balance m the welding arc by taking advantage of the different arc characteristics obtained with each of the two polarities.<br/> In this paper, we proposed new VP GMA Welding method by control DSP 320C32, and the characteristic and experiment result-voltage, current, welding bead, penentraion by this method are presented
저속영역에서 최대 토크 발생이 가능한 대용량 BLDC 모터의 설계
조승현(S.H. Cho),김철우(C.U. Kim),빈재구(J.G. Bin),주수억(S.E. Cho),최철(C. Choi) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
Recently, Development of Rare Earth Permanent magnet with the high remanence, high coercivity allow the design of brushless motors with very high effIciency over a wIde speed range. Cogging torque is produced In a permanent magnet by magnetic attraction between the rotor mounted permanent magnet and the stator teeth. It is an undesired effect that contributes to the machines output ripple, vibration, and noise. This cogging torque can be reduced by varIation of magnet arc length, airgap length, magnet thickness, shifting the magnetic pole and varying the radIal shoe depth and etc.<br/> In this paper, Some airgap length and magnet arc that reduce cogging torque are found by FEM(Fmite element method). The SPM type of high-capacity BLOC motor is optimized as a sample model.<br/>
김원호(W. H. Kim),강유리(Y.L. Kang),김성준(S. J. Kim),이광학(K. H. Lee),김철우(C. U. Kim) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
With the increasing demands for clean environment, development of air cleaning systems has been received increasing attention.<br/> Pulse power systems are widely used for air cleaning in the industrial applications. high voltage pulse power supply affects the performance of the overall environmental system<br/> In this study, high voltage micro pulse power supply for removing NOx in diesel engines is developed.<br/> The ratings of the pulse voltage is 20kV. The pulse width is 10usec and max. pulse repetition ratio is 1kHz.