• 한국항해항만학회:학술대회논문집
• /
• 한국항해항만학회 2005년도 춘계학술대회 논문집
• /
• pp.133-139
• /
• 2005

스마트 디지털 콤파스를 구현하기 위하여 고투자율 등방성 자기물질을 이용한 공진형 마그네토미터(RM)을 설계하였다. 코어에 감은 코일의 인덕턴스 L은 코어의 투자율 $\mu(H)$ 에 비례함을 이론적으로 정립하였고, L의 변화는 간단한 슈미트 트리거 회로를 이용하여 주파수로 획득할 수 있었다. 또한, 반도체 스위치를 이용함으로서 회로를 간단히 구성할 수 있고, 온도에 따른 드리프트와 작동점 이동 문제를 해결할 수 있었다. 자기코어는 Metglas사의 2705M이 최적임을 알았고, RM을 이용하여 측정한 값으로 선체영구자기 성분을 구할 수 있음을 확인하였다.

• Journal of Electrical Engineering and Technology
• /
• 제3권2호
• /
• pp.213-217
• /
• 2008

The flux-lock type superconducting fault current limiter(SFCL) can apply the magnetic field into the high-$T_C$ superconducting(HTSC) element by adopting the magnetic field coil in its third winding. To apply the magnetic field into the HTSC element effectively, the capacitor for LC resonance is connected in series with the magnetic field coil. However, the current waveform of third winding for the application of the magnetic field is affected by the LC resonance condition for the frequency of the source voltage and can affect the waveform of the limited fault current. In this paper, the current waveform of the third winding in the flux-lock type SFCL according to LC resonance condition during a fault period was analyzed. From the differential equation for its electrical circuit, the current equation of the third winding was derived and described with the natural frequency and the damping ratio as design parameters. Through the analysis according to the design parameters of the third winding, the waveform of the limited fault current was confirmed to be influenced by the current waveform of the third winding and the design condition for the stable fault current limiting operation of this SFCL was obtained.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2001년도 춘계학술대회논문집B
• /
• pp.235-240
• /
• 2001

This paper introduces developed prototype intelligent pig which detects corrosion on pipeline by using Magnetic Flux Leakage technology. The 8 inch developed MFL(Magnetic Flux Leakage) pig is composed of 5 yokes which magnetize pipeline wall and 45 Hall sensors which detect MFL signal. The designed MFL modules are analyzed by using magnetic circuit method in order to confirm whether pipeline wall is fully saturated. A variety of artificial defects are manufactured on 8 inch diameter steel pipeline in order to acquire MFL signals. So leakage flux of the axial, radial and circumferential component was acquired as defects. The results of this paper show that design technique for 8 inch MFL pig can be applied to large diameter MFL pig and 0.5mm defect depth can be detected.

• 한국자동차공학회논문집
• /
• 제16권3호
• /
• pp.44-51
• /
• 2008

The performance design and analysis of an electric motor for vehicles is very complicated due to the variety of parameters. This paper presents the design of the BLDC motor for electric air compressor in high voltage(42V) system and compares with the characteristics of IPM, SPM type BLDC motor. Futher, optimal design for the electric motor has been carried out using Equivalent Magnetic Circuit and FEM Modelling. By analyzing the design results, it is found that design parameters for BLDC motor provided an useful tool for vehicles motor design.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2001년도 하계학술대회 논문집 B
• /
• pp.653-656
• /
• 2001

This paper describes the design and the analysis of permanent magnetic actuator "Magnetic Switch" using classical method and 2D finite element method. The classical method gives an outline of permanent magnet size and analysis is carried out by finite element method. Therefore we make use of the result in specific detail site of magnet. The transient state is simulated in order to calculate the response time of "Magnetic Switch". The simulation is based upon a step-by-step integration of the electric circuit equations and the tore movement. The contactor uses a permanent magnet for maintaining the closed state. The presented solution takes account of non-linear magnetic material property and spring force controlled by core position. The dynamic response of "Magnetic Switch" is predicted by the simulation agrees closely with the required condition.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2000년도 하계학술대회 논문집 B
• /
• pp.792-794
• /
• 2000

This paper describes the design and the analysis of electromagnetic system of Magnetic Switch using 2D parametric finite element method(EM-Pulse). Magnetic Switch is electrical equipment, which is widely used for switching on/off motors in industrial field. The transient state is simulated in order to calculate the response time of Magnetic Switch. The simulation is based upon a step-by-step integration of the electric circuit equations and the core movement. The contactor uses a permanent magnet for maintaining the closed state. The presented solution takes account of non-linear magnetic material property and spring force controlled by core position. The dynamic response of Magnetic Switch predicted by the simulation agrees closely with the required condition.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제52권12호
• /
• pp.587-594
• /
• 2003

This paper presents a design and characteristic analysis of an SRM drive for EPS(Electrically Power Steering) application. A rack mounted EPS system is considered in this paper. A conventional driving room space and mechanical structure are considered in a design stage. In the restricted design conditions, motor parameters are determined for sufficient torque and speed. For the smooth torque generation and simple circuit of power system, 12/8 motor drive is considered. With FEM and magnetic circuit analysis, designed motor is simulated to meet the requirement of specifications. Effectiveness of the suggested SRM drive for EPS application is studied by the drive tests of a prototype motor.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1989년도 추계학술대회 논문집 학회본부
• /
• pp.45-48
• /
• 1989

A method for analyzing magnetic circuit in a capacitor-discharge impulse magnetizer established by the finite element method. As the detailed distribution of the flux can be obtained, the optimum design of the magnetizer will be possible using our method. The validity of the method is verified by comparing the calculated results with results measured.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2003년도 하계학술대회 논문집 B
• /
• pp.870-872
• /
• 2003

This paper deals with the characteristic analysis of capacitor-run single phase induction motor by equivalent circuit. The unbalanced elliptic rotating magnetic field of the motor was analysed by the symmetrical coordinate method. And this paper check the reliability of characteristic analysis by equivalent circuit in comparison with experimental results and analyse the characteristics of single phase induction motors by changing circuit parameters. Finally, this paper shows the improved effiency design motor by using that result.

• 전기학회논문지
• /
• 제56권12호
• /
• pp.2179-2183
• /
• 2007

In this paper, to produce sheet plasma with high density for ion plating, we designed magnetic circuit of ion plating device consisting of solenoid coil and rectangular permanent magnet. And, we analyzed the effects of the magnetic field distribution using FEM (Finite Element Methode). Additionally, we made a sputtering system including ion plating technique on the basis of the design and verified the possibility of the sheet plasma application for advanced sputter system.