• 한국자기학회지
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• 제5권5호
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• pp.828-832
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• 1995

This paper describes the efficient design, analysis method and experimental verification of capacitor discharge impulse magnetizer system. A capacitor discharge magnetizer system is used to produce a high current impulse of short duration in this magnetizing fixture. The parasitic resistance and parasitic inductance of the capacitor discharge impulse magnetizer system have been estimated using known air-core test coil. Finite element analysis (using MAXWELL 2-D field simulator) and magnetizing circuit analysis (using SPICE) are also used as part of the design and analysis process of the capacitor discharge impulse magnetizer system. Application study for a magnetizing fixture design is shown. 8-pole magnetizing fixture has been designed and analyzed using finite element analysis. The fixture design for 8-pole magnet are presented along with the experimental results. The experimental results have been achieved using a high-voltage, high-energy capacitor discharge impulse magnetizer and 8-pole iron core fixtures (charging voltage : 2000[V], capacitor bank : 4000[$\mu\textrm{F}$]).

• 대한전기학회:학술대회논문집
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• 대한전기학회 1992년도 하계학술대회 논문집 B
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• pp.645-648
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• 1992

In a capacitor-discharge impulse magnetizer, one of the magnetic application system, a magnet is magnetized by the discharging current of capacitors. The conventional design of the magnetizer has been based on many year's experience. The behaviour of flux in the magnetizer should be calculated in order to produce the desired magnets. The analysis of the flux distribution is quite difficult. This is because both the magnetizing current and the applied voltage to the magnetizer are unknown. This paper describes the development of computer model for a capacitor-discharge impulse magnetizer using SPICE. Also, the detailed distribution of the flux density in a magnet magnetized by the impulse magnetizer be analyed.

• 한국조명전기설비학회지:조명전기설비
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• 제11권4호
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• pp.66-73
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• 1997

반도체 스위칭소자를 이용한 커패시터 방전 임펄스 착자기는 착자요크에 순간적인 고전류 임펄스를 방전시켜 여러 종류의 영구자석을 생산하는데 사용된다. 요즈음 이러한 착자기의 비용은 상당히 고가이다. 본 연구에서는 반도체 스위칭 소자를 이용한 커패시터 방전 임펄스 착자기의 비용산정을 위한 방법 및 그 경제적 분석에 대하여 제시하였다. 이를 위하여 5개의 부시스템으로 구성되는 비용 구조를 이용하였다. 특히 Learning Curve를 이용한 임펄스 착자기의 비용감소 및 평가절하에 의한 비용의 변동추이를 관찰하였다. 중용량 착자기와 연결된 철심요크 (브러시레스 직류모터의 8극 회전자 자석용)를 이용하여 신뢰할 수 있는 결과를 얻었다.

• 대한전기학회논문지
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• 제43권2호
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• pp.206-215
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• 1994

A method for simulating general characteristics and temperature characteristics of discharging SCR of the capacitor discharge impulse magnetizer-magnetizing fixture system using SPICE is presented. This method has been developed which can aid the design, understanding and inexpensive, time-saving of magnetizing circuit. As the detailed characteristic of magnetizing circuit can be obtained, the efficient design of the magntizing circuit which produce desired magnet will be possible using our SPICE modeling. Especially, computation of the temperature rise of discharging SCR is very important since it gives some indication of thermal characteristic of discharging circuit. It is implemented on a 486 personal computer, and the modeling results are checked against experimental measures. The experimental results have been achived using 305[V] and 607[V] charging voltage, low-energy capacitor discharge impulse magnetizer-magnetizing fixture of air cleaner DC motor.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 B
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• pp.776-779
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• 2002

This paper describes the magnetizer design of highly saturated magnetic circuit by high external field. The magnetizer is loaded by a capacitor bank with impulse currents to reach high magnetic flux-density(typically 5[T]). Magnetizing current come out from magnetizing system is simulated by analytic method and transient FEM, also field distributions of the magnetizer are analyzed.

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

• 전력전자학회논문지
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• 제2권2호
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• pp.1-7
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• 1997

커패시터 방전회로의 제작 및 시험을 위해서는 고가의 비용과 위험요소가 내재되어 있으며 특히 고전력 응용을 위해서는 이러한 요소는 더욱 커지게 된다. 그 대체방법으로는 컴퓨터를 이용하여 이 회로의 동작을 모델링하고 시뮬레이션하는 것이다. 본 연구에서는 커패시터 방전 임펄스 착자가 착아 요크 시스템을 위한 SPICE 모델을 개발하고 시뮬레이션 결과를 실제 시스템의 측정치와 비교하였다. 또한 착자기 시스템의 방전회로를 위한 온도산정방법을 제안하였다. 특히 임펄스 착자기의 방전회로의 온도산정은 착자회로 설계의 중요한 지침이 되므로 극히 중요하다. 본 연구에 이용된 착자기는 저손실 유입 커패시터이며, 최대 1200[V]의 충전이 가능하다. 이러한 착자 모델의 개발을 통하여 고임펄스 방전 회로의 설계 및 개발에 소요되는 시간 및 비용을 절약하는데 크게 기여할 것이다.

• 한국자기학회지
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• 제5권5호
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• pp.833-836
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• 1995

A capacitor discharge impulse magnetizer is used to produce a high current pulse of short duration in a magnetizing fixture for magnets of the various shapes. The problem of designing custom fixtures for magnetization has often been considered more of conventional experience than a scientific theory. Therefore, the design of magnetizingfixture has until recently been a "cut and try" process. It was common to literally blow up one or more fixtures beforeachieving the desired results. Finite element CAD package allow the design of such a fixture. Since magnetizing fixtures come in a variety of sizes and shapes, there is usually no simple analysis method that can be used to estimate the field characteristics of the fixtures. Instead, one typically uses finite element analysis. FEA program MAXWELL is the primary tool used here. The purpose of this study was a examine both theoretically and experimentally the field characteristics inside the fixture. Independent of sizes and shapes of magnetizing fixtures, the desired magnetic field can be obtained with resonable predictability. The experimental results have been achieved using a 1000[V], 22.4[KJ] capacitor discharge magnetizer and iron-core fixtures.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 A
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• pp.319-321
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• 1997

This paper deals with multipolar magnetizing process which can exert a considerable influence on the final performance of permanent magnet machine. In combination with impulse discharge magnetizer, the analysis and design of magnetizing fixture using finite element method is required to obtain the accurate characteristics of permanent magnet for small-size step motor. Simulated result of flux density shows good agreement with measured one.

• 대한전기학회논문지
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• 제43권3호
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• pp.381-387
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• 1994

In this paper, we found the improved SPICE heat transfer modeling of impulsed magnetizing fixture system and investigated temperature characteristics using the proposed model. As the detailed thermal characteristics of magnetizing fixture can be obtained, the efficient design of the impulsed magnetizing fixture which produce desired magnet will be possible using our heat transfer modeling. The knowledge of the temperature of the magnetizing fixture is very important of forecast the characteristics of the magnetizing fixture which produce desired magnet will be possible using our heat transfer modeling. The knowledge of the temperature of the magnetizing fixture is very important to forecast the characteristics of the magnetizing circuits under different conditions. The capacitor voltage was not raised above 810[V] to protect the magnetizing fixture from excessive heating. The purpose of this work is to compute the temperature increasing for different magnetizing conditions. The method uses multi-lumped model with equivalent thermal resistance and thermal capacitance. The reliable results are obtained by using iron core fixture (stator magnet of air cleaner DC motor) coupled to a low-voltage magnetizer(charging voltage : 1000[V], capacitor : 3825[$\mu$F]. The modeling and experimental results are in close aggrement.