• 제목/요약/키워드: equivalent circuit.

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동기식의 새로운 등가회로 (New Equivalent Circuit of a Synchronous Machine)

  • 박민호;현동석
    • 대한전기학회논문지
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    • 제34권11호
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    • pp.440-444
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    • 1985
  • Voltage equations of a synchronous machine are derived from the electromagnetic field theory in order to develop a new equivalent circuit model considering core loss. The result from the new equivalent circuit model is superior to that of the conventional one in the analysis of machine performance and characteristics on optimal efficiency control of a synchronous motor.

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DGS 구조의 4-port 등가회로 및 파라미터에 대한 추출 방법에 대한 연구 (A study for the extraction of DGS 4-port equivalent circuit and it's parameters)

  • 손창신;정명섭;최승완;박준석;임재봉;조홍구
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2004년도 하계학술대회 논문집 C
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    • pp.2043-2045
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    • 2004
  • This thesis complemented the weak points that the existing theses did not represented a phase characteristic as the equivalent circuit by applying 4-port simulation to DGS (Defected Ground Structure) characteristic and an equivalent circuit, which are the transmission line structure that has the defect made in the ground surface. We used a distribute device and a lumped device, obtained the equivalent circuit by applying the structure of balun to a discontinuous part. An indicated DGS (Defected Ground structure) is a dumbbells-shaped single defect, we indicated satisfying a magnitude and phase characteristics by applying this equivalent circuit.

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3상유도전동기의 간이등가회로에 의한 비례추이 오차 (Errors of Proportional Shifting due to Simplified Equivalent Circuit of a 3-Phase Induction Motor)

  • 신명호
    • 조명전기설비학회논문지
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    • 제27권1호
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    • pp.109-112
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    • 2013
  • It is well known that the maximum torque of a 3-phase induction motor does not vary as the resistance of rotor varies by proportional shifting. However, proportional shifting is derived using simplified equivalent circuit of induction motor. Therefore, there are some errors in the torque characteristics shown in the text book. This paper presents the torque characteristics using not simplified equivalent circuit but equivalent circuit. Errors produced by simplified equivalent circuit are presented.

4포트 커넥터 시스템의 등가회로 변환에 관한 연구 (Equivalent Circuit Model for Four Port Connector System)

  • 심민규;김종민;나완수
    • 전기학회논문지
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    • 제56권6호
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    • pp.1105-1110
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    • 2007
  • This paper describes an equivalent circuit modeling of 4-port connector system. A coupled transmission line was designed and fabricated, mimicking a 4-port connector system, and then S-parameters were measured using 4 port VNA (Vector Network Analyzer). The S-parameters from measurement and from Full-wave simulator coincided quite nice. By using these S parameters, an equivalent circuit parameters for a 4-port system was obtained. The time domain response from the equivalent circuit model matched to the signals, which was measured using TDR(Time Domain Reflectometry) meter. We were also convinced that there should be enough bandwidth to get a meaningful time domain result from Fourier inverse transformation of the S parameters. In addition, we applied the conversion algorithm to the 4-port connector system, which calculates the S-parameters of a 4 port system using the data from a 2-port VNA with the other ports open. Comparison of the two data, one from measurement and the other one from the conversion algorithm, was made in this manuscript.

유한요소법을 이용한 3상 유도전동기 등가회로에서의 파라미터 계산 (Estimation of Equivalent Circuit Parameters of Three-Phase Induction Motor Utilizing Finite Element Method)

  • 장전해;렌지얀;고창섭
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2011년도 제42회 하계학술대회
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    • pp.983-984
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    • 2011
  • An effective estimation method of equivalent circuit parameters of three-phase induction motor by using FEM is presented in this paper. Arbitrary three torque-speed points at asynchronous speed on the torque-speed curve are required by using time-stepping FEM, then the equivalent circuit parameters of IM can be calculated rapidly with presented method. After obtaining the equivalent circuit parameters, the general analysis method based on equivalent circuit can be used to get entire torque-speed curve very quickly. Although the purely numerical method such as FEM also can estimate torque-speed curve directly and accurately, however, usually this process is time consuming.

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등가회로법에 의한 커패시터 구동 단상 유도전동기의 특성해석 (Characteristic Analysis of Capacitor Run Single-Phase Induction Motor by Equivalent Circuit Method)

  • 좌종근;김호민;김도진
    • 전기학회논문지P
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    • 제60권4호
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    • pp.220-226
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    • 2011
  • This paper proposes a straightforward method of analyzing the operation characteristics for the capacitor run single-phase induction motor from the traditional equivalent circuit based on the revolving field theory. The proposed method consists of five procedures as follows: mechanical loss segregation, iron loss segregation and calculation of the equivalent circuit parameters, recalculation of parameters of the main winding side, calculation of the auxiliary winding magnetizing reactance and effective turn ratio, and analyzing the operation characteristics for this motor. When the characteristics are analyzed, the segregated mechanical and iron losses are considered as a loss resistance across input terminals of the equivalent circuit for the analysis. The validity of the proposed method is verified from the comparison between the computed results and the experimental ones for the operation characteristics.

EM Solver 의 주파수 응답 데이터를 이용한 RF 수동 소자의 등가회로 모델링에 관한 연구 (Equivalent Circuit Model of RF passive components based on its simulated frequency response data)

  • 오상배;고재형;한형석;김형석
    • 한국정보통신설비학회:학술대회논문집
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    • 한국정보통신설비학회 2007년도 학술대회
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    • pp.27-30
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    • 2007
  • This paper deals with an equivalent circuit model for RF passive components. Rational functions are obtained from the frequency responses of EM simulation by using Foster canonical partial fraction expressions. The Vector Fitting(VF) and the Adaptive Frequency Sampling(AFS) scheme are also implemented to obtain the rational functions. A passivity enforcement algorithm is applied to ensure the stability of the equivalent circuit model. In order to verify the schemes, S parameters of the equivalent circuit model is compared to those of EM simulation in case of the microstrip line structure with 3 slots in ground.

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다중 다공판 시스템의 흡음계수 계산에 있어서 전기음향등가회로법의 오류 (The Error Involved in the Equivalent Electroacoustic Circuit Approach for the Estimation of the Absorption Coefficient of Multiple Layer Perforated Plate Systems)

  • 이동훈;권영필
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2002년도 추계학술대회논문집
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    • pp.890-895
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    • 2002
  • The equivalent electroacoustic circuit approach has been conventionally used for estimating the absorption coefficient of a single layer perforated plate system. When the single layer system is extended to the multiple layer ones, however, it is found that an analogy error has been involved in the equivalent electroacoustic parallel circuit approach proposed by previous investigators. The analogy error is demonstrated by the corrected equivalent electroacoustic circuit approach in this study.

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유리함수 근사를 이용한 등가회로 모델링 (Equivalent Circuit Modeling Applying Rational Function Fitting)

  • 백현;고재형;김군태;김형석
    • 정보통신설비학회논문지
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    • 제8권1호
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    • pp.1-5
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    • 2009
  • In this paper, we propose a method that applies Vector Fitting (VF) technique to the equivalent circuit model for RF passive components. These days wireless communication system is getting smaller and smaller. So EMI/EMC is an issue in RF. We can solve PI/SI (Power Integrity/Signal Integrity) that one of EMI/EMC problem apply IFFT for 3D EM simulation multiple with input signal. That is time consuming task. Therefore equivalent circuit model using RF passive component is important. VF schemes are implemented to obtain the rational functions. S parameters of the equivalent circuit model is compared to those of EM simulation in case of the microstrip line structure.

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능동 소자의 실장을 위한 새로운 DGS구조와 4-port등가 모델링 방법 연구 (A study of modeling novel DGS 4-port equivalent circuit for mounting active device)

  • 손창신;박준석;김형석;임재봉
    • 한국정보통신설비학회:학술대회논문집
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    • 한국정보통신설비학회 2004년도 하계학술대회
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    • pp.386-389
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    • 2004
  • This thesis complemented the weak points that the existing theses did not represented a phase characteristic as the equivalent circuit by applying 4-port simulation to DGS (Defected Ground Structure) characteristic and an equivalent circuit, which are the transmission line structure that has the defect made in the ground surface. We used a distribute device and a lumped device, obtained the equivalent circuit by applying the structure of balun to a discontinuous part. An indicated DGS (Defected Ground structure) is a dumbbells-shaped single defect, we indicated satisfying a magnitude and phase characteristics by applying this equivalent circuit.

  • PDF