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李敏明 大田開放大學 1986 論文集 Vol.5 No.-
The possibilities of using, instead of electric, equivalent circuits for most electrical machines are here explored further. The concept of an equivalent magnetic circuit, analogous to an equivalent electric circuit, in which flux replaces current, m.m.f replaces e.m.f and reluctance replaces resistance, is well known and widely used, but the technique is generally restricted to the equivalent of d.c electric circuits. This paper shows how the technique may be extended to cover a.c electro-magnetic systems, using the concepts of quadrature impedance and mutual inductance in the magnetic circuit.
이민명,김윤곤 大田産業大學校 1998 한밭대학교 논문집 Vol.15 No.1
Power system grounding is very important for stable operation of power facilities, electronic communication devices and human safety as well as for anti-lightning design of the system. It is difficult however to estimate ground resistance exactly due to many uncertain parameters in nature such as soil resistivity, perceptivity, current density in soil, seasonal variation of those values and etc. It becomes more complicate under large impulse current like lightning surge currents due to their corona discharge in-soil, which has highly nonlinear cransient characteristics. Since the impulse currents caused by lightning stroke would give rise to insulation failures of power system facilities, it is necessary to distribute the currents into soil as soon as possible. Unlike the ground resistance as in low frequency, impulse impedance doesn’t be reduced proportionally according to the increase of grounding area. Rather high soil resistivities in Korea makes it more difficult to reduce impulse impedance of grounding electrode. This paper describes the measurement, design of grounding electrode and reduction method of ground resistance. In particular, grounding electrodes with needles were used to investigate the impulse impedance behaviour under fast-rising surge current. And we compared its performance with currently used common grounding electrodes by impulse test using outdoor impulse voltage generator. The experimental result showed that the impulse impedance could be reduced considerably by grounding electrode with needles which causing corona discharge in soil more easily.
Switched Reluctance 전동기의 운전 한계 기준에 관한 연구
이민명 大田産業大學校 1996 한밭대학교 논문집 Vol.13 No.0201
Switched reluctance motors have gained attention in the variable-speed drive market. The savings in manufacturing cost of the motor due to its simplicity of construction and use of mini- mum number of switching devices in the drive circuit are two important factors in its favor compared to any other motor drive. Realizing that this has come about principally due to the modern development of switched reluctance motors. The present paper is concerned with some of the design aspects of the switched reluctance motor for non-servo applications. Towards this objective, a step-by-step procedure is developed for the design of switched reluctance motors.
PARAMETRIC RELUCTANCE MOTOR의 動作原理에 關한 硏究
李敏明 大田工業專門大學 1983 論文集 Vol.33 No.-
The parametric motor is a reluctance machine which operates asynchronously despite the absence of any winding on the rotor, An approximate analytical solution for the current, comprising a series of upper and lower sidebands based on the fundumental supply frequency, permits the calculation of the total average torque in terms of the contribution from individual sideband components. Those sidebands, the frequency of which is closest to the system's large-signal natural frequency. In the present paper the mechanism of torque production in the parametric motor is explained and the conditions necessary for the machine to function are determined.
李敏明 大田工業專門大學 1979 論文集 Vol.25 No.-
熱力學과 統係機械學의 側面에서 電氣機械變換機를 硏究함에있어 나타난 Coenergy 개념을 다루었으며 이두가지 學文이 서로 接近한다는 것은 Coenergy가 磁化된 係統이나 誘電體物質에 對한 Lagrangian이라는 結論에 귀착하게 된다.
이민명 大田産業大學校 1995 한밭대학교 논문집 Vol.12 No.0201
This paper presents a method accurately calculating the torque and current of switched Reluctance Motor from computed flux linkage/current, torque/angular displacement and Coenergy/rotor position by dealing with their function effetively. However using this method in order to study new style SRM furthermore in future, this will Contribute to design the construction of motor and develope it's performance.