• Title/Summary/Keyword: hysteresis loss

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Loss Analysis and Efficiency Evaluations of Synchronous Reluctance Motor Using Coupled FEM & Preisach Modelling (유한요소법과 프라이자흐 모델을 이용한 SynRM의 손실해석과 효율평가)

  • Cho, Yong-Hyun;Lee, Il-Kyo;Lee, Jung-Ho
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.718_719
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    • 2009
  • This paper deals with the loss analysis and efficiency evaluations in a synchronous reluctance motor (SynRM) using a coupled transient finite element method (FEM) and Preisach modeling, which is presented to analyze the characteristics under the effect of saturation and hysteresis loss. The focus of this paper is the efficiency evaluation relative to hysteresis loss, copper loss, etc. on the basis of speed, load condition in a SynRM. Computer simulation and experimental result for the efficiency using dynamometer show the propriety of the proposed method.

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Influence of width and lateral separation of the strips on AC Loss in subdivided YBCO thin film (필라멘트 구조로 분리된 YBCO 박막에서 필라멘트 넓이와 간격이 교류손실에 미치는 영향)

  • Na D. H;Park H. W;Kim M. J;Chang Y. S;Kim J. M;Ri H. C;Lee Y. H
    • Progress in Superconductivity
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    • v.6 no.1
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    • pp.32-36
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    • 2004
  • To investigate the influence of strip width and inter-strip separation on the ac loss, arrays of parallel strips with different widths and separations were prepared. Studies on the hysteresis-loss characteristics of multifilamentary YBCO films were performed. The local magnetic field due to magnetization currents is measured by a scanning Hall probe microscope. Based on these results a conceptual design for a low loss YBCO coated conductor is suggested.

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A Double Band Hysteresis Current Control Method (이중밴드 히스테리시스 전류 제어 방식)

  • Oh W.H.;Yoo C.H.;Shin E.C.;Park S.M.;Noh H.Y.;Yoo J.Y.
    • Proceedings of the KIPE Conference
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    • 2003.07b
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    • pp.579-583
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    • 2003
  • Hysteresis controllers are intrinsically robust to system parameters, exhibit very high dynamic response and are suitable for simple implementation. But the current control using a conventional hysteresis controller has the disadvantage that high switching frequency may happen due to lack of coordination among individual hysteresis controllers of three phases. This will of course increase the switching loss. In addition, the current error is not strictly limited. So, in this paper to reduce the switching frequency, a double band hysteresis current controller is proposed. The presented control system was tested with digital simulation in the Borland C++ program and demonstrate the advantage of proposed hysteresis current controller.

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The Effect of the Processing Conditions on the Magnetics Properties of Mn-Zn ferrite (제조공정에 따른 Mn-Zn 페라이트의 전자기적 특성변화)

  • 김종령;이해연;김현식;오영우;민복기
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.07a
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    • pp.905-908
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    • 2001
  • The microstructure and the magnetic properties of Mn-Zn ferrite, which were power loss and saturation magnetic flux density, were investigated as the function of the process before firing. The highest initial permeability and the lowest power loss were attained to the specimen with CaO 400 ppm as a resulted from the highest solubility to SiO$_2$and the creation of liquid phase which improved sintering. The biggest grain size, the highest saturation magnetic flux density and the lowest power loss, which was resulted from that the eddy current loss increased as grain size increased but the hysteresis loss much more decreased and the hysteresis loss strongly influenced on the total power loss rather than the eddy current loss, were obtained to the Mn-Zn ferrite added 2wt% PVA. The power loss was lowest and the saturation magnetic flux density was highest in case of 1 ton/$\textrm{cm}^2$ and the grain size was not influenced.

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Magnetization Loss Characteristics of a Stacked Bi-2223 Conductor (적층 Bi-2223도체의 자화손실 특성)

  • Ryu, Gyeong-U;Han, Hyeong-Ju;Choe, Byeong-Ju;Na, Wan-Su;Ju, Jin-Ho
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.51 no.10
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    • pp.554-559
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    • 2002
  • The at loss is an important issue in the design of superconducting cables and transformers. In these devices the Bi-2222 tapes are usually placed face-to-face. In such arrangements ac loss is influenced by adjacent tapes. The effect is investigated by measuring the magnetization loss in the stacked conductor, which consists of various numbers of Bi-2223 tapes. For the single tape the magnetization loss in perpendicular field is larger than that in parallel field by about a factor 10. This agrees well with the prediction for hysteresis loss in slab and strip models. For the stacked conductor in perpendicular field the magnetization loss at low fields is greatly decreased, compared to the loss of the single tape. However the loss at high fields is nearly unaffected. This behavior is well described by the slab model.

Digital simulation of hysteresis motor performance using Preisach model considering time and space harmonics (Preisach 모델을 이용한 히스테리시스 모터 고조파 특성 시뮬레이션)

  • Jung, Hoon;Hong, Sun-Ki;Won, Jong-Su
    • Proceedings of the KIEE Conference
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    • 1988.11a
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    • pp.5-8
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    • 1988
  • A digital simulation method for Hysteresis motor using Preisach model is proposed. From this, the instantaneous torque, hysteresis loss of rotor can be calculated, considering slot and winding distribution and current harmonics.

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Flow Control with Hysteresis effect in ATM Network (ATM망의 히스테리시스 특성을 이용한 흐름제어기법)

  • 정상국;진용옥
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.31A no.9
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    • pp.10-17
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    • 1994
  • In this paper, a priority schedling and a flow control algorithm with hysteresis effect are proposed for high-speed networks. A mathematical model for the flow control is proposed and a cell transition probability from this model is found. And the performance of the proposed algorithm is analyzed by a computer simulation. According to the simulation results, it can be shown that the priority scheduling and the flow control with hysteresis effect get the cell loss probability 0.061 better and the average delay 100ms better and the average delay 100ms beter than those of single threshold.

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Analysis of the Rotational Magnetic Field using the FEM and the 2-Dimensional Permeability Tensor (유한 요소법과 이차원 텐서를 이용한 회전자계의 특성 해석)

  • Lee, Chang-Hwan;Kim, Hong-Kyu;Jung, Hyun-Kyo;Hong, Sun-Ki
    • Proceedings of the KIEE Conference
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    • 1996.07a
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    • pp.169-171
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    • 1996
  • Recently, the finite element analysis(FEM) using two dimensional magnetic permeability tensor was introduced to calculate the magnetic field considering the rotational hysteresis. We obtain the tensor matrix from the measured data using two-dimensional magnetic measuring apparatus. We calculate the induced magnetic flux density and the rotational hysteresis loss under the model with the same condition with the measuring apparatus. Therefore we show that FEM with tensor can be used to calculate the magnetic flux density and the rotational hysteresis loss in the arbitrary rotational magnetic field.

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Development of a Compensating Algorithm for an Iron-cored Measurement CT using Flux-magnetizing Current Curves and Voltage-core Loss Current Curves (자속-자화 전류 곡선과 전압-철손 전류 곡선을 이용한 측정용 철심 변류기의 보상 알고리즘 개발)

  • Kang, Yong-Cheol;Zheng, Tai-Ying;Kang, Hae-Gweon;Lee, Byung-Eun;Kim, Yong-Gyun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.10
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    • pp.1849-1854
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    • 2009
  • This paper describes the design, evaluation and implementation of a compensating algorithm for an iron-cored measurement current transformer (CT) that removes the effects of the hysteresis characteristics of the iron-core. The exciting current resulting from the hysteresis characteristics of the core causes an error of the CT. The proposed algorithm decomposes the exciting current into the core loss current and the magnetizing current and each of them is estimated. The core loss current is calculated from the secondary voltage and the voltage-core loss current curve. The core flux linkage is calculated and then inserted into the flux-magnetizing current curve to estimate the magnetizing current. The exciting current at every sampling interval is obtained by summing the core loss and magnetizing currents and then added to the measured current to obtain the correct secondary current. The voltage-core loss current curve and flux-magnetizing current curves, which are different from the conventional curves, are derived in this paper. The performance of the proposed algorithm is validated under various conditions using EMTP generated data. The experimental test results of an iron-core type electronic CT, which consists of the iron-core and the compensation board, are also included. The results indicate that the proposed algorithm can improve the accuracy of the measurement CT significantly, and thus reduce the size and the cost of the CT.