• 한국산업정보학회논문지
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• 제28권2호
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• pp.21-30
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• 2023

전기차 보급과 고성능화가 진행됨에 따라 높은 출력을 가지는 모터의 수요가 증가하고 고용량 IPMSM 생산을 위한 고용량 착자기의 중요성 또한 증가하고 있다. 착자에 중요한 착자 전류의 최댓값과 커패시터 방전시간은 착자요크의 회로정수에 의해 결정된다. 본 논문에서는 착자기 설계를 위한 착자요크의 회로정수 설계를 위하여 MATLAB SIMULINK를 활용한 착자 시스템의 해석을 진행하고 회로정수 설계를 위한 설계 절차를 제시한다. 그 결과 착자용량 5,000[V], 15,000[uF]에 따라 착자요크 파라미터는 0.015[ohm], 0.035[mH]로 도출하였다.

• 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.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.38-40
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• 2008

Distribution of Permanent magnet used in the spindle motor on the ODD is arranged by magnetizer. In general, permanent magnet is putted between yoke and back yoke of magnetizer so that symmetric magnetization distribution. But the magnet has unsymmetric magnetization distribution because of eccentricity of the yoke in mass production. So, in this paper we discuss the effect of asymmetric magnetization distribution on back EMF and cogging torque of the spindle motor.

• 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.

• 한국정보처리학회논문지
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• 제3권4호
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• pp.1014-1025
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• 1996

현재 CRT(Cathode-Ray Tube)의 마그네트(Magnet) 생산업체에서 색상제어에 사용 構殷있는 착자기 및 착자검사기는 수동으로 작업 시간이 오래 걸리고 오동작 시킬 우려가 있다. 본 연구에서는 착자와 검사 공정까지를 한 시스템으로 묶은 시스템 장치를 개발하여 전공정을 자동화시켰다. 따라서 본 시스템은 매회 작업 상태를 검사하고 품질의 산포를 정확하게 분석하여 착자 및 착자 상태 검사의 신뢰도를 향상시켜 불량을 없애도록 하였다.

• 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.

• 한국자기학회:학술대회 개요집
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• 한국자기학회 1992년도 춘계연구발표회 논문개요집
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• pp.30-31
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• 1992

• 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.

• 동력기계공학회지
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• 제8권3호
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• pp.52-57
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• 2004

A new non-destructive inspection technique has been developed. One characteristic of the technique is that defects are visualized by laser ray. Magnetic domains and domain walls of a magneto-optical sensor(MO sensor) are varied by the magnetic flux leaked by defects, and the variations are observed by the reflected light of the laser ray. The information of defect can remotely be inspected by this technique in a real time. This paper describes the results estimated on the 2-dimensional surface defects and opposite-side defects in a ferromagnetic material and the natural surface defect in a clutch disk wheel. The light region of a visible image and the magnitude of a reflected light increases as the input current of the magnetizer increases. The natural surface defect, that has not the width of crack's open mouth, can be also visualized like as 2-dimensional artificial defects.

• 비파괴검사학회지
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• 제30권6호
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• pp.521-526
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• 2010

Gas transmission pipelines are often inspected and monitored using the magnetic flux leakage method. An inspection vehicle known as a "pig" is launched into the pipeline and conveyed along the pipe by the pressure of natural gas. The pig contains a magnetizer, an array of sensors and a microprocessor-based data acquisition system for logging data. This paper describes magnetic flux leakage (MFL) signal processing used for detecting mechanical damages during an in-line inspection. The overall approach employs noise removal and clustering technique. The proposed method is computationally efficient and can easily be implemented. Results are presented and verified by field tests from an application of the signal processing.