• Title, Summary, Keyword: Hysteresis loss

Search Result 199, Processing Time 0.042 seconds

A Study Iron Losses On the Cable Racks adjacent to Under Ground Power Cable (지중전력 케이블에 근접한 지지물의 철손에 관한 연구)

  • 전승구;김기흥
    • The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.10 no.3
    • /
    • pp.71-77
    • /
    • 1996
  • This paper is described on the eddy current for a peripheral magnetic objects of under ground power cable. The materials of cable rack is used FRP and SUS in the place of iron. Each specimen were measureed for eddy current loss and Hysteresis loss by Epstein's method. The results is compared each other. Hysteresis loss is inversely proportional to $\textrm{f}^{0.6}$ of frequence as supply voltage is constant. Also, iron loss is increased to 0.86 times for varinace of frequency from 60[Hz] to 50[Hz] as a maxium flux density is constant. In the case of Fe, Hysteresis loss is above 70[% ] of total iron loss. In the other hand, SUS is decreased to go[%] of Fe. by the simulation results using Loss Program Package. The iron loss of materials SUS, FRP is near zeor by Epstein's method.

  • PDF

Hysteresis loss of YBCO thin film strip with filamentary structure (필라멘트 구조의 YBCO 박막의 자기이력 손실)

  • Park H. W;Na D. H;Kim M. J;Chang Y. S;Kim J. M;Ri H.-C;Lee Y. H
    • Progress in Superconductivity
    • /
    • v.6 no.2
    • /
    • pp.99-103
    • /
    • 2005
  • For ac applications a detailed understanding of the ac power losses associated with different conductor configurations is of crucial importance. YBCO thin films were divided into parallel filaments with widths of 1, 2, and 4 mm to reduce hysteresis losses. The measured hysteresis losses show a linear relationship between the strip width and hysteresis loss as anticipated. The influence of different inter-filament separations on the hysteresis loss is investigated.

  • PDF

Heat Characteristics Analysis of Synchronous Reluctance Motor Using FEM Coupled Electromagnetic Field and Thermal Field

  • Lee, Jung-Ho;Jeon, Ah-Ram
    • Journal of Magnetics
    • /
    • v.15 no.3
    • /
    • pp.138-142
    • /
    • 2010
  • This paper reports the development of an analysis method in a synchronous reluctance motor (SynRM) using the finite element method (FEM) coupled with the electromagnetic field of the Preisach model, which represents an additional thermal source due to hysteresis loss and a thermal field. This study focused on thermal analysis relative to hysteresis and copper losses in a SynRM.

Effects of Crystal Grain Size and Particle Size on Core Loss For Fe-Si Compressed Cores

  • Takemoto, Satoshi;Saito, Takanobu
    • Proceedings of the Korean Powder Metallurgy Institute Conference
    • /
    • /
    • pp.1183-1184
    • /
    • 2006
  • Core loss of soft magnetic powder cores have been focused on to achieve high efficiency of power supplies. In this study the effects of crystal grain size on core loss were investigated by changing heat treatment conditions. It was found that core loss is influenced by crystal grain size because eddy current loss decreased and hysteresis loss increased by making crystal grain size smaller, and it is also influenced by particle size.

  • PDF

Study on the Power Loss of High Frequency Mn-Zn ferrites (고주파 Mn-Zn ferrites 전력손실에 대한 고찰)

  • 서정주
    • Journal of the Korean Institute of Resources Recycling
    • /
    • v.11 no.5
    • /
    • pp.34-38
    • /
    • 2002
  • To minimize the size of transformer volume, the operating frequency of ferrites cores increasing. The power loss of Mn-Zn ferrites comprises hysteresis loss, eddy current loss and residual loss. In the range more then 500 KHz, the total power loss is mainly due to the residual loss. The power loss increase with the frequency 3rd power. To minimize residual loss as well as eddy current loss, the microstructure should have small grain and high density, It should be noted that as the product of resonance frequency and static permeability increase, the power loss decrease at high frequency region.

Finite Element Analysis for Hysteresis Motors (히스테리시스 전동기의 유한요소해석)

  • Hong, Sun-Ki;Won, Jong-Soo
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.15-17
    • /
    • 1995
  • Hysteresis motor is a synchronous machine which has simple structure and self-start characteristic but also has serious difficulties in numerical analysis. In this study, a finite element analysis for hysteresis motor considering the hysteresis characteristics is presented. The hysteresis model is the magnetization-dependent Preisach model which explains hysteresis phenomena very well. From this, we estimate the instantaneous torque, average torque and hysteresis loss of the rotor, considering slot and winding distribution.

  • PDF

A Study on the Estimation of Temperature in Track Components due to Hystresis Loss. (히스테리시스 손실에 의한 괘도부품의 온도 추정에 관한 연구)

  • Kim, H.J.;Kim, B.T.;Baek, W.K.
    • Journal of the Korea Society For Power System Engineering
    • /
    • v.5 no.3
    • /
    • pp.48-55
    • /
    • 2001
  • In many applications. rubber components undergo dynamic stresses or deformations of fairly large magnitude. Since rubbers are not fully elastic, a part of the mechanical energy is converted into heat due to the hysteresis loss. Heat generation without adequate heat dissipation leads to heat build up. i. e. internal temperature rise. The purpose of this paper is to predict temperature rise caused by the hysteresis loss, in a rubber pad subjected to complex dynamic deformation. In this unsteady thermal analysis, the temperature distributions of track components are displayed in contour shapes and the temperature variations of some important nodes are represented graphically with respect to the running time of the tank.

  • PDF

Compensating Algorithm for the Secondary Current of a Measurement CT Considering the Hysteresis Characteristics of the Core (히스테리시스 특성을 고려한 측정용 변류기 2차 전류 보상 알고리즘)

  • Kang, Yong-Cheol;Zheng, Tai-Ying;Jang, Sung-Il;Kim, Yong-Gyun;So, Soon-Hong
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.56 no.10
    • /
    • pp.1709-1714
    • /
    • 2007
  • This paper proposes a compensating algorithm for the secondary current of the 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 between the primary current and the secondary current of the measurement CT. The exciting current can be decomposed into the magnetizing current and the core loss current. The core loss current is obtained from the measured secondary current and the core loss resistance. The core flux linkage is calculated by integrating the measured secondary current, and then inserted into the flux-magnetizing current curve to obtain 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 current. The performance of the proposed algorithm is validated under various conditions using EMTP generated data. 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 measurement CT.