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광센서를 이용한 SRM의 위치각 검출과 상별 여자신호의 발생
김선구,신흥교 慶尙大學校 工科大學 自動化및컴퓨터應用技術硏究所 1998 自動化 및 컴퓨터應用技術 Vol.5 No.1
In the SRM drive, information on the rotor position is needed in order to properly excite each phase for continuous torque production. And many control strategies of SRM reported require higher resolution to improve the motor performance. This paper presents a new commutation scheme with position and speed detection from the low resolution opto-interruptor for the SRM drive. The scheme permits the realization of self startup and four-quadrant operation for common types of 6/4 SRM with simple logic. This detection and communication scheme were tested in the laboratory in variable-speed SRM drive, and the test results were found to be excellent.
김정호,마대영,신흥교,김상현 慶尙大學校生産技術硏究所 1990 生産技術硏究所論文集 Vol.6 No.-
As high Tc superconductor is developed recently, the effect of electrode on the dielectric breakdown characteristics of liquid N₂is studied in the thesis. The polarity effect of liquid N₂depends on the electrode distance. In a short qap, the breakdown voltage is highest for uniform field and becomes lower for positive needle and lowest for negative needle. In a long gap, however, The order is reversed. From the results it may be concluded that the breakdown mechanism of liquid N₂is the positive streamer breakdown for positive needle and the bubble breakdown for negative needle. This conclusion can be supported from several other experiments concerning conditioning effect, pressure dependence, and so on. In the design of cryogenic insulation it is recommented to coat an electrode with insulating material (SiO₂)and to use commercial liquid N₂rather than highly purified liquid N₂coolant and insulating material. But low breakdown voltage of cryogenic gas N₂requires caution in the design.
문승필,도대호,최재석,이순영,신흥교,김상현,김용신,김홍식 慶尙大學校 工科大學 自動化및컴퓨터應用技術硏究所 1998 自動化 및 컴퓨터應用技術 Vol.5 No.1
A new technique using search method based on fuzzy multi-criteria function is proposed for generator maintenance scheduling. Minimization of probabilistic production cost, maximization of system reliability level and air pollution are considered for fuzzy multi-criteria function. To obtain an optimal solution for generator maintenance scheduling under fuzzy environment, fuzzy multi-criteria relaxation method(fuzzy search method) is used. The practicality and effectiveness of the proposed approach are demonstrated by the simulation results of the real size model system.