• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제5B권4호
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• pp.317-323
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• 2005

To increase the operating speed of the solenoid actuator, this paper proposed a modified model using a non-magnetic ring, which is welded on the magnetic guide tube, and also presents the characteristic equations, results of Finite Element Method (FEM) analysis for magnetic flux distribution and density in magnetic flux paths, and computer simulation results for the dynamic characteristics of plunger motion according to the stroke and time variation. As well, we proved the non-magnetic ring effect by experiments using prototypes.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.6-8
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• 2005

The plunger speed of solenoid actuator is affected by mass of plunger, magnetic motive force, inductance, and return spring. These factors are not independent but related with each other according to design characteristics of solenoid actuator. So, it is impossible to change the designed value for the purpose of increasing plunger speed. In this study, we have analyzed the characteristics of high-speed solenoid actuator having a non-magnetic ring which plays a role to concentrate the effective magnetic flux into plunger. For more detailed analysis, we have performed FEM analysis and decided the optimal attaching position and length on the guide tube based on these results. And, we proved the propriety of the non-magnetic ring effect by experiments.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 B
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• pp.1309-1311
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• 2005

The operating speed of PWM controlled high speed magnet is affected by mass of plunger magnetic motive force inductance and return spring It is impossible to change the value of them for the purpose of increasing the speed because these factors are related with each other This paper introduces a speed increasing method using a non magnetic ring which is welded in the middle of magnetic guide tube and also presents the characteristic equations results of FEM analysis for magnetic flux distribution and computer simulation results for the dynamic characteristics of plunger motion And we proved the effect of non magnetic ring by experiments using a prototype

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 B
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• pp.816-818
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• 2003

Solenoid actuator's operating speed is affected by magnetic motive force, plunger mass, inductance, return spring constant, and eddy current. Recently, non-magnetic ring is generally used for improving the operational speed, because it is impossible that changing of any specified design factor and stacking of plunger steel. This paper represents the dynamic equations of solenoid actuator, simulations for the response characteristics, analysis of eddy current effect by using the induced time constant. And, we experiment for the operating characteristics in case of non-magnetic ring is exists and not exists in the plunger.

• 전기의세계
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• 제29권9호
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• pp.594-598
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• 1980

This paper describes an analytical method on the starting torque of hysteresis motor, taking account of penetration effects of magnetic-field and eddy-current into the rotor, to the elliptical approximation method of hysteresis-loop. By the above method, it have obtained the torque of rotor ring with non-magnetic and non-conductive material arbor, and the results are concerned and compared with that of computed by aid of callibration factor, k=1+exp(-2t$_{r}$/.delta.).)

• Journal of Magnetics
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• 제21권2호
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• pp.209-214
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• 2016

This paper analyzes the magnetic property according to the machined shape of steel material with non-oriented silicon steel (50PN470/50A470), that is most commonly used in the design of electrical equipment. Toward this end, specimens were produced and divided into Bar-Specimen (Epstein Frame Tester) and Ring-Specimen (Toroidal Ring Tester). The characteristics of the electrical Silicon steel were measured using the instruments solely dedicated to measuring each specimen. The core loss of the Bar-Specimen, which is commonly used, was found to be less than that of the Ring-Specimen. This is a very important design factor in achieving the objectives of improving the product efficiency and predicting the performance of electrical equipment. It serves as a critical point of view in order to reduce the error between design value and product value. A comparative analysis was conducted regarding various characteristics (Hysteresis, B-H characteristic, Iron loss, Minor loop, Coercive force, Residual magnetic flux density, etc.) of the electrical silicon steel considered in the design of the electrical equipment according to the specimen.

• 한국자기학회지
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• 제14권4호
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• pp.143-148
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• 2004

가스관의 비파괴검사로 가장 널리 사용되고 있는 자속누설탈사에서 가스배관의 잔류자화(residual magnetization, $M_{res}$)와 탐사횟수가 누설자속에 미치는 영향을 정량적으로 간편하게 실험실에서 해석할 수 있도록 배관대신에 소형의 모의장치를 제작하여 조사하였다. 제작된 장치는 나사에 의한 결함까지도 측정할 수 있고 또 원형 링을 완벽히 탈자시킬 수 있어 탐사가 진행됨에 따라 잔류자화의 영향, 배관의 자화상태변화와 누설자속 등을 효과적으로 모사할 수 있었다. 탐사횟수가 증가할수록 잔류자화, 최대자속밀도 그리고 검출전압은 감소하다가 일정해지지만 초기잔류자화(initial $M_{res}$)가 커지면 최종잔류자화(final $M_{res}$)도 커졌다. 탐사조건이 일정할 경우 검출전압은 배관의 최대자속밀도보다는 직전의 잔류자화의 크기에 직선적으로 비례하였으며 이것은 탄소강으로 만들어진 원형 링의 자기이력현상, 즉 자구구조의 변화 때문에 생기는 것으로 정확한 탐사신호를 해석하기 위해서는 이력현상을 고찰할 필요가 있다. 또 잔류자화가 크면 첫 번째 탐사에서 높은 검출전압을 얻을 수 있다는 것을 착안하여 두 번째 탐사에서는 착자기의 자화방향을 바꾸면 높은 검출을 얻을 수 있음을 제안하였다.

• 한국자기학회:학술대회 개요집
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• 한국자기학회 2007년도 The 1st International Symposium on Advanced Magnetic Materials
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• pp.66.2-66.2
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• 2007

• 한국전자파학회논문지
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• 제23권3호
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• pp.402-405
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• 2012

본 논문에서는 non-bianisotropy 특성을 갖는 IDC(Interdigital Capacitor)를 이용한 메타 물질(metamaterial) 단위셀 구조를 제안하였다. IDC 단위 셀에 유도되는 자기 공진으로 인하여 SRR(Spilt Ring Resonator)와 같이 특이한 유효 매질 파라미터 값들이 나타내게 된다. 제안된 단위 셀은 기존의 SRR 단위 셀 구조에 비하여 전기적으로 더 작게 설계할 수 있다. 도파관 측정법을 이용하여 얻은 응답 특성을 통해 추출된 셀의 유효 파라미터 값은 시뮬레이션을 통해 얻어진 결과와 유사한 특성을 보였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1987년도 정기총회 및 창립40주년기념 학술대회 학회본부
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• pp.57-60
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• 1987

In the electrical machinery, the efficiency of the machine is decreased because of the occurrence of the armature reaction. Various kinds of literatures have suggested the methods to eliminate the armature reaction. However, It is far from satisfactory. In this paper, By using the proper combination of ring coils and the body of non-magnetic materials, the methods to increase output of the machine are suggested.