• The Transactions of the Korean Institute of Electrical Engineers P
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• 제63권3호
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• pp.212-217
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• 2014

The electric power output characteristics of magnesium fuel cell were investigated with regard to internal resistance. A equivalent circuit with the series-connected three internal resistance was introduced to analyze of the response to change of power. The power output analysis was employed in order to investigate the effect of internal resistances for the electrolyte concentration, air electrode area, Mg electrode area and distance between the electrodes. It was confirmed that internal resistance is generated by the electrolyte, air electrode and metal electrode, then those Internal resistances had a significant effect on the power output decrease. The power output was a maximum when the load resistance maches the internal resistance of the magnesium fuel cell. The fuel efficiency was only 50% at maximum power output. Higher fuel efficiency was achieved when the load resistance is greater than the internal resistance.

• Journal of Electrical Engineering and Technology
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• 제9권6호
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• pp.1914-1920
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• 2014

In this paper, characteristics of blushless direct current (BLDC) motor including core loss are analyzed considering pulse width modulation (PWM) of inverter. Input voltage of BLDC motor due to PWM is calculated considering duty ratio and carrier frequency of inverter in order to control torque or speed of BLDC motor. For the calculation of core loss, the input current with harmonics due to PWM voltage is calculated by using equivalent circuit model of BLDC motor according to switching pattern and carrier frequency. Next, core loss is analyzed by inputting the currents as a source of BLDC motor for FEM. Characteristics including core loss are compared with ones without PWM waveform according to reference speed.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• 제20권8호
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• pp.63-70
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• 2006

This paper presents design of the linear propulsion system of a high-speed (200km/h) dynamic tester for catenary-current collection. Among various propulsion systems, a permanent magnet linear synchronous motor is chosen for need of high acceleration force. The design is performed by the equivalent magnetic circuit method and verified by the finite element method. In addition, analysis of the main effects of various design variables for performance of the propulsion system has been done by using simulation-based DOE method.

• Proceedings of the KIPE Conference
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• 전력전자학회 2008년도 하계학술대회 논문집
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• pp.250-252
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• 2008

An inductor-capacitor-inductor (LCL) filter are widely adapted in grid-connected inverter applications. In this paper, the harmonic attenuations of the LCL filter are quantitatively analyzed, and then the design optimization of two inductance values, which are related on a cost and a size, is illustrated. Based on the design optimization, the LCL filter employing a Symmetric Geometry is proposed. Through the equivalent circuit analysis of the proposed LCL filter, the operating characteristics and validity are presented in detail. In addition, simple proportional-integral (PI) current controller suitable for the LCL Filter is designed to mitigate the resonance problem. From simulation results, it is seen that the proposed LCL filter and control method have a sufficient attenuation and stability for the high frequency distortions and load variations.

• The Transactions of the Korean Institute of Electrical Engineers B
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• 제54권3호
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• pp.120-126
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• 2005

This paper deals with a Double-type Transverse Flux Linear Motor which can be applied to high power system. This type can reduce overall system volume because it has a double flux path, and less number of phases and turns comparing with prototype for one phase. This machine is based on permanent magnet excitation, and the pole shape is designed to reduce attraction force between stator and mover poles. In the paper, the basic configuration of double type is introduced first, and the principle of movement is explained. After performing the characteristic analysis by 3-dimensional equivalent magnetic circuit network, the results are discussed.

• Proceedings of the KIEE Conference
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• 대한전기학회 2001년도 하계학술대회 논문집 B
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• pp.693-695
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• 2001

A computational method for the 3 dimensional electro-magnetic induction problems has been developed. The proposed method is capable of modeling the eddy current and analyzing its characteristics using only scalar potential. A benchmark model of asymmetrical conductor with a hole is analyzed to verify the application of the developed method. The calculated value of magnetic flux density are compared with the measured value, and the results indicate that the developed method is valid.

• Proceedings of the KIEE Conference
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 A
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• pp.899-901
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• 2005

EMTP 프로그램으로 뇌써지 발생시 가공송전선로 등가모델 구현을 위한 필수적인 요소들과 비선형 요소들을 시간영역에서 해석이 가능하다. 따라서 이번 연구에서는 EMTP를 이용하여 전력전송이 이루어지는 가공 송전 선로 등가모델을 구현하고 전송선로의 길이와 굵기, 뇌격전류의 크기를 변화시켜가면서 시뮬레이션을 통해 자료를 얻는다. 이 과정으로 얻어진 결과는 송전계통의 설계에 사용되어 안정적인 전력 전송에 적용될 수 있을 것이다.

• Proceedings of the KIEE Conference
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 D
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• pp.3111-3113
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• 2005

EMTP 프로그램으로 뇌써지 발생시 가공송전선로 등가모델 구현을 위한 필수적인 요소들과 비선형 요소들을 시간영역에서 해석이 가능하다. 따라서 이번 연구에서는 EMTP를 이용하여 전력전송이 이루어지는 가공 송전 선로 등가모델을 구현하고 전송선로의 길이와 굵기, 뇌격전류의 크기를 변화시켜가면서 시뮬레이션을 통해 자료를 얻는다. 이 과정으로 얻어진 결과는 송전계통의 설계에 사용되어 안정적인 전력 전송에 적용될 수 있을 것이다.

• Proceedings of the KIEE Conference
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• 대한전기학회 1998년도 추계학술대회 논문집 학회본부 C
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• pp.878-880
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• 1998

Quartz crystal in contact with viscoelastic medium is described directly in terms of the electrical equivalent circuit of the system. Stearic acid is used as viscoelastic medium and deposited on the surface of quartz crystal using the Langmuir-Blodgett(LB) method. Impedance properties of quartz crystal coated with LB films which were investigated and the possibility of applying the technique to chemical sensing introduced.

• Proceedings of the KIEE Conference
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• 대한전기학회 2006년도 추계학술대회 논문집 전력기술부문
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• pp.381-383
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• 2006

A de-wiring trolley wire usually makes the electrical system complex and may have an adverse effect on the electrical system inside the train. It is important to analyze the effect on trains in de-wiring trolley wire. we accomplished an equivalent model of the electric train system. We used PSCAD/EMTDC, an electromagnetic transient program. The result of this study can be used as a facility design to use a power conversion system filter and needs to prove through actual field data in the main circuit of an electric train for a precise analysis about effect of de-wiring.