• Journal of information and communication convergence engineering
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• 제6권3호
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• pp.305-309
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• 2008

This paper presents an innovative prototype of a new conceptual electromagnetic induction eddy current based fluid heating appliance using voltage-fed quasi resonant zero voltage soft switching PWM high-frequency inverter using IGBTs, which can operate at a constant frequency variable power regulation scheme. The promising simple high efficient low noise inverter type electromagnetic induction eddy current based pipeline fluid heating appliance is proposed for saturated steam generator, superheated steam generator, hot water and hot air producer, metal catalyst heating for exhaust gas cleaning in engine. Under these technological backgrounds, a novel electromagnetic induction eddy current Dual Packs Heater(DPH) based pipeline fluid heating incorporates thin metal layer type package for continuous fluid heating appliances applying two types of voltage-fed quasi load resonant ZVS-PWM high frequency inverter. The unique features of a novel electromagnetic induction eddy current DPH based continuous pipeline fluid heating appliance is illustrated on the basis of simulation and discussed for the steady state operating characteristics and experimental results.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.788-789
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• 2011

A comprehensive thermo-electromagnetic model has been developed to estimate temperature and electromagnetic distribution in an three-phase induction motor under steady state operation. Electromagnetic modeling enables us to predict thermal dissipation rates by eddy-current loss and copper loss in induction motors. Non-uniform temperature distributions are investigated to account for the strong effect of local temperature build-up on the motor performance and expected life-span. For more accurate thermal modeling purpose, Heat loss mapping method, which is matched up with electromagnetic losses and volumetric heat source, is developed and performed analysis. Heat loss mapping method can be greatly used as a design or diagnostic tool for three-phase induction motors with complex structural electromagnetic fields.

• 소성∙가공
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• 제16권2호
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• pp.113-119
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• 2007

Rapid mold heating has been recent issue to enable the injection molding of thin-walled parts or micro/nano structures. Induction heating is an efficient way to heat material by means of an electric current that is caused to flow through the material or its container by electromagnetic induction. It has various applications such as heat treatment, brazing, welding, melting, and mold heating. The present study covers a finite element analysis of the induction heating process which can rapidly raise mold temperature. To simulate the induction heating process, the electromagnetic field analysis and transient heat transfer analysis are required collectively. In this study, a coupled analysis connecting electromagnetic analysis with heat transfer simulation is carried out. The estimated temperature changes are compared with experimental measurements for various heating conditions.

• 한국인터넷방송통신학회논문지
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• 제9권4호
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• pp.153-159
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• 2009

본 논문은 전자기 유도 방식을 이용한 유선 태블릿의 화표 측정 방법에 대해 소개하고자 한다. 많은 태블릿이 전자기 유도 방식을 이용하여 좌표를 측정한다. 태블릿에서 펜의 위치를 추적하는 것은 태블릿의 성능과도 직결되는 문제이므로 매우 중요한 요소이다. 본 논문에서는 본 연구에서 개발한 유선 태블릿 장치에서 획득한 전자기 유도 신호로부터 전자펜의 위치를 실시간으로 측정하는 좌표 측정 알고리즘에 대해 소개하고자 한다.

• Journal of electromagnetic engineering and science
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• 제10권4호
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• pp.276-281
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• 2010

In this paper, an electromagnetic induction on a telecommunication line by the distribution line of a power provision system or a feeder line of an electrified railway system has been verified through experiments. The basic cause of induction occurrence by these practical power provision systems is the returning current through the earth. This principle has been confirmed by the experiments documented in this paper which implemented these mechanisms to incur an induction. Experimental methods were used to produce the returning current through the earth. The experiment to find a relationship between inducing strength and the distance between the two phase lines in a power provision line has also been included to confirm that, when the distance is enlarged, the induction effect increases as the cross-nullification effect of magnetic fluxes decreases. An experiment for the existence of a shielding effect by another conduction length material has been addedas a protection measure against the induction.

• 한국구조물진단유지관리공학회 논문집
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• 제12권4호
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• pp.179-186
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• 2008

콘크리트 구조물 내의 철근탐사는 구조물의 상태를 평가하는 가장 중요한 단계중의 하나이다. 콘크리트 내의 철근 탐사 장비는 전자파레이더법과 전자기 유도법의 원리를 적용하고 있으며, 본 연구에서는 두 가지 원리를 적용한 비파괴시험장비의 철근직경, 피복두께 및 습윤상태에 따른 철근탐사 신뢰성을 시험적으로 분석하였다. 시험에는 1,000mm(길이)${\times}$300mm(폭)인 9개의 콘크리트 시험체가 이용되었으며, 시험체내 철근의 피복두께는 45, 60, 100mm로 변화시키고 배근간격은 100mm이상으로 하였다. 시험결과, 전자기 유도법의 경우, 철근직경이 커짐에 따라 오차가 증가하는 것으로 나타났다. 그 반면에 전자파레이더법의 경우, 실제 피복두께에 맞는 비유전율에 따라 계측하여 깊은 심도의 경우에도 신뢰성이 우수한 것으로 나타났다.

• Journal of international Conference on Electrical Machines and Systems
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• 제2권2호
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• pp.154-158
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• 2013

Reduction of electromagnetic vibration and acoustic noise from three-phase squirrel-cage induction motors (IMs) is very important, particularly from the standpoint of environmental considerations. Although the electromagnetic vibration of IMs has been studied for several years, the relationships between the radial distribution of the electromagnetic vibration and noise and the electromagnetic forces responsible for them have not yet been analyzed in sufficient detail. In the present study, we investigated this relationship experimentally for a small IM under different load conditions. Our results clearly show that the radial distributions of the dominant electromagnetic vibration and noise components match the mode shape of the dominant electromagnetic force producing these components.

• 조명전기설비학회논문지
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• 제19권5호
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• pp.68-73
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• 2005

본 논문은 선형유도전동기를 이용한 전자기펌프의 특성해석에 대하여 연구한 것이다. 전자기 펌프는 선형유도전 동기의 추진력에 의하여 용융 금속을 이송할 수 있다. 추진력을 높이기 위해 유전 알고리즘을 사용하여 최대 추력을 가지는 선형유도전동기를 설계 하고, 선형유도전동기를 이용한 전자기 펌프의 특성해석을 유동해석에 의하여 분석하였다.

• 전기학회논문지
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• 제68권1호
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• pp.13-18
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• 2019

The domestic overhead transmission lines use a vertical configuration and reverse phase arrangement, but when there is a limitation in steel tower height because the transmission lines pass a height limit zone or special zone, an application of triangular arrangement is necessary, and a study on the optimal phase arrangement to minimize inductive interference for this is necessary. If conductor arrangement are changed, the action of electrostatic induction and electromagnetic induction becomes different from before changes, so the changed conductor arrangement should be reviewed in terms of inductive interference. So this paper presents an optimal phase arrangement to reduce inductive interference by calculating electrostatic induction and electromagnetic induction according to conductor arrangement.

• Journal of Advanced Marine Engineering and Technology
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• 제23권2호
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• pp.201-209
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• 1999

This paper presents a general analytical method for analyzing mechanical unbalance response of unbalanced electromagnetic forces produced in induction motors with an eccentric rotor and a phase unbalance. The equations to be solved are a set of second order differential equations which give matrices with periodic coefficients that are a function of time due to the unbalanced electro-magnetic force. Unbalance response is processed by Newmark $\beta$ method. Two examples are given including an industrial application. The results show that the method proposed is satisfactory.