• 조명전기설비학회논문지
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• 제22권3호
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• pp.88-95
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• 2008

In the paper, the permanent magnet synchronous generator of 1.5[MW] output power which is driven directly without gear system is designed by conventional magnetic equivalent circuit method and analyzed by finite element method. We analyzed the characteristics of generator like no load, rated load, short circuit condition and demagnetization of permanent magnet in order to verify the design results by magnetic circuit method. The last, the analysis results of two kinds of rotor types are compared with each other. Especially the THD(total harmonic distortion) of output voltage is examined for the comparison.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제4B권3호
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• pp.114-121
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• 2004

Switched reluctance motors have received much attention as a driving means for various industrial applications because they have simple construction, low cost and high efficiency. Nevertheless, the requirements of drive converters make it difficult to lower the overall system cost as compared with the DC motor application. Single phase switched reluctance motors (SPSRMs) provide a solution to the high cost problem since the number of switching power devices can be reduced and consequently the trials for application are increased. However, research involving SPSRMs, especially in the area of design work, is insufficient. This paper introduces a novel design methodology of single phase SRM. The design work for SPSRM comprises the determination of many variables such as stator and rotor pole arc as well as on, off and so on. Managing all variable combinations leads to lengthy computation time and a fault in the design process. For that reason, a reliable technique and brief procedure term are required in SPSRM design.

• 전기학회논문지
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• 제60권4호
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• pp.759-765
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• 2011

This paper proposes an effective assistant model for considering the stator slot-opening effect on air gap flux density distribution in conventional interior-type permanent magnet (IPM) motor. Different from the conventional slot-opening effect analysis in surface-type PM (SPM) motor, a composite effect of slot-opening uniquely existing in IPM motor, which additionally causes enhancement of air gap flux density due to magnet flux path distortion in iron core between the buried PM and rotor surface. This phenomenon is represented by a proposed assistant model, which simply deals with this additional effect by modifying magnetic pole-arc using an effective method. The validity of this proposed analytical model is applied to predict the air gap flux density distribution in an IPM motor model and confirmed by finite element method (FEM).

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2004년도 제23회 추계학술대회 논문집
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• pp.235-238
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• 2004

본 연구에서는 개방형 액체로켓엔진의 안정성 분석을 위해 선형 시스템 특성 방정식의 극(pole)의 위치 분석 방법을 이용하여 터보펌프 회전체의 특성에 따른 안정성을 분석하였고, 엔진의 설계 요구 조건에 따라 시스템의 안정성과 효율을 고려한 터보펌프의 설계 방향을 제시하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 B
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• pp.805-807
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• 2002

In this paper, a method for an accurate and fast transient analysis, which employs a single slot model for the rotor, is presented. The equivalent circuit parameters are extracted from a combined method of F. E. M and equivalent circuit on 1 slot rotor boundary condition. Two kinds of circuit parameters for each slip are applied to equivalent circuit controlled by variable-voltage variable- frequency. One is the constant parameters at rated speed, and the other is the parameters varying in accordance with slip-frequency. The computer characteristics of the suggested method for four-pole 1.5KW induction motor are compared with those of Equivalent circuit for the transient analysis.

• 한국자기학회지
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• 제5권2호
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• pp.103-108
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• 1995

본 논문에서는 돌극형 발전기의 유기전압 고조파 해석 방법을 제안하였다. 해석방법은 회전자 이동을 고려한 2차원 유한요소법을 사용하여 고정자 코일에 쇄교하는 자속을 구하고 이를 DFT로 분석하였다. 제안한 방법의 타당성을 검증하기 위하여 150 KW 동기 발전기의 유기전압 고조파를 구하고 이를 실험차와 비교하였다.

• 동력기계공학회지
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• 제9권2호
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• pp.45-49
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• 2005

Liquefied natural gas takes up six hundredths of the volume of natural gas, which makes storage and transportation much easier. To send out natural gas via a pipeline network across the nation, high-pressure LNG pumps supply highly compressed LNG to high-pressure vaporization facilities. The Number of high-pressure LNG pumps determined the send-out amount in LNG receiving terminal. So it is main equipment at LNG production process and should be maintained on best conditions. In this paper, to find out the cause of high beat vibration at cryogenic pumps, vibration and motor current signal analysis have been performed. High vibration of cryogenic pumps could be reduced due to the modification of motor rotor.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2005년도 춘계학술대회논문집
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• pp.776-779
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• 2005

Liquefied Natural Gas takes up six hundredths of the volume of natural gas, which makes storage and transportation much easier. To send out natural gas via a pipeline network across the nation, high pressure LNG pumps supply highly compressed LNG to high-pressure vaporization facilities. The Number of high Pressure LNG pumps determined the send out amount in LNG receiving terminal. So it is main equipment at LNG production process and should be maintained on best conditions. In this paper, to find out the cause of high beat vibration at cryogenic pumps, vibration and motor current analysis have been performed. And high beat vibration of cryogenic pumps could be reduced due to the modification of motor rotor.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2004년도 전력전자학술대회 논문집(1)
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• pp.219-223
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• 2004

Since rotor position information is necessary to drive the SRM, absolute-encoder, resolver and incremental encoder is used to detect a rotor position. But, it is not desirable to use a high price encoder and microprocessor under the condition of the simple driving system when precision control is not demanded. In this paper, only using the reflective type two photo-sensors replaces the conventional opto-interrupter and slotted-disk, which not only remove a slotted-disk section but drive three-phase 6/4 pole SRM bidirectionally, Therefore, control circuit can compose common analog device with low price.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.41-43
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• 2008

This paper deals with a study on characteristic of inductance on spoke type motor. The rotor and stator is redesigned as rounding teeth of stator and pole surface of rotor. Result, a shape of air-gap is changed and the cogging torque is reduced greatly. In consequence, the inductance of spoke type motor is changed. The Finite Element Analysis(FEM) is used to characteristics.