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정명길(M. G. Jung),노건상(G. S. Roh) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The primary objective of this study is to developed shuttle valve having microscopic groove for smooth and quick operation. Generally shuttle valve are controlled both sides, microscopic groove of developed shuttle valve in this study ensured open-close smoothly and quickly. The test for performance of development shuttle valve is noise test, durability test, pressure test and leakage test. The dB(A) levels of noise test was closed background noise. The durability test was gave load pressure of 2.0 ㎏f/㎠ for 15,000 cycles. The press test was loaded press(1.5 times of maximum allowable pressure) for 15 seconds. And the leakage test was loaded press(l.1 times of maximum allowable pressure) for 15 seconds. The results of these test are showed excellent performance, and performance of developed shuttle valve in this study was verified sufficiently.
박건태(G.T.Park),윤재학(J.H.Yoon),정명길(M.K.Jung),김두식(D.S.Kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
IGBTs are widely used for the industrial inverters in the mid power range at low voltage (440V -660V) application. Advantageous features of the device are simple gate drive and high speed switching capability. Due to these advantages the application of IGBTs is enlarging into the high power application. However, to increase the power handling capacity at lower input voltage level, the current rating m each bridge arm must be enlarged. Therefore the parallel operation of IGBT devices is essentially needed.<br/> This paper describes the feasible parallel structures of the power circuit for the IT\1d & the high power inverters and introduces the important design condition for the parallel operation of IGBT devices.<br/> To verify feasibility of the IGBT parallel operation, the feature of several IGBT devices (EUPEC, SEMIKRON's IGBT) are investigated and the power stacks are implemented and tested with these devices. The experimental results show the good characteristics for the parallel operation of IGBTs.
3레벨 인버터로 구동되는 유도전동기 직접토크제어의 낮은 스위칭 주파수에서의 토크 리플 저감법
이교범(K. B. Lee),송중호(J. H. Song),최익(I. Choy),유지윤(J Y. Yoo),정명길(M G. Jung),한기준(K. J. Han),윤재학(J. H. Yoon) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
This paper presents a torque ripple reduction technique of direct torque control(DTC) for high power induction motors driven by 3-level Inverters with the inverter switching frequency limited around 0.5-1kHz level. It is noted that conventional DTC algorithms to reduce torque ripple are devised for applications with relatively high switching frequency above 2-3kHz. A new DTC algorithm, especially 'for low switching frequency inverter system, illustrates relatively reduced torque ripple characteristics. Simulation and experimental results show the effectiveness of the proposed control algorithm.