• 제목/요약/키워드: magnetic hysteresis

검색결과 368건 처리시간 0.034초

자화이력 해석을 위한 hysteresis 모델에 관한 연구 (Study of hysteresis model for magnetic hysteresis analysis)

  • 이정종;송백기;홍정표
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2009년도 제40회 하계학술대회
    • /
    • pp.871_872
    • /
    • 2009
  • This paper presents study of hysteresis model for magnetic hysteresis analysis by Preisach model. In ferromagnetic material, magnetization is non-linear and varies according to magnetic field which is called B-H curve. As hysteresis phenomenon affect on performance of motor, magnetic hysteresis analysis is essential and needed for designing motor that satisfies specification. Therefore, in this paper, methods for calculating magnetization are presented and discussed.

  • PDF

미소자성체를 이용한 자기히스테리시스 모델 연구 (Basic study on hysteresis modeling using micromagnetics for magnetic field analysis)

  • 천영진;김종태;위상봉
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2007년도 Techno-Fair 및 추계학술대회 논문집 전기물성,응용부문
    • /
    • pp.83-85
    • /
    • 2007
  • In magnetic field analysis of electrical machines, hysteresis phenomena of B-H curves should be taken into account in order to obtain more accurate results. In this paper, the hysteresis modeling using the micromagnetics for the magnetic field analysis is investigated. In the micromagnetics, usually, it takes much CPU times. Therefore, the method for representing hysteresis phenomena by minimum modeling is investigated in order to applying it to the magnetic field analysis. First, the micromagnetics is described. Then, the method of minimum modeling is shown. Finally, the hysteresis curve obtained by the minimum modeling is demonstrated. The effect of parameters of micromagnetics on the shape of hysteresis curve is investigated.

  • PDF

A Model of Magnetic Bearings Considering Eddy Currents and Hysteresis

  • Myounggyu Noh
    • International Journal of Precision Engineering and Manufacturing
    • /
    • 제4권3호
    • /
    • pp.5-11
    • /
    • 2003
  • A simulation model for radial magnetic bearings is presented. The model incorporates hysteresis, saturation and eddy current effects. A simple magnetization model that describes hysteresis and saturation is proposed. Eddy currents are taken into consideration by assuming that they are generated by single-turn fictitious coils wrapped around each magnetic flux path. The dynamic equations describing the simulation model can easily incorporate the operation of switching power amplifier. A simulation of a typical 8-pole radial magnetic bearing produces switching waveforms very similar to the experimental observation.

전기강판의 벡터 자기특성 모델링을 위한 개선된 E&S Vector Hysteresis Model (Improved E&S Vector Hysteresis Model for the Precise Modeling of Vector Magnetic Properties of Electrical Steel Sheet)

  • 송민호;윤희성;고창섭
    • 전기학회논문지
    • /
    • 제60권9호
    • /
    • pp.1684-1692
    • /
    • 2011
  • Recently, several vector hysteresis models such as vector Preisach, vector Jiles-Atherton and dynamic E&S model have been proposed to describe vector magnetic properties of electrical steel sheets. However, it is still difficult to find an adequate vector hysteresis model in finite element application for both the Non-oriented and Grain-oriented electrical steel sheets under alternating and rotating field conditions. In this paper, an improved E&S vector hysteresis model is suggested to describe the vector magnetic properties of both Non-oriented and Grain-oriented electrical steel sheets under various magnetic field conditions including alternating and rotating magnetic field conditions. The validity of the proposed model is tested through comparisons with the experimental results under various magnetic field conditions.

두 개의 자기경로 철심을 갖는 코일의 자기결합을 이용한 초전도 전류제한기의 히스테리시스 특성 (Hysteresis Characteristics of a SFCL using a Magnetic Coupling of Coils with an Iron Core of Two Magnetic Paths)

  • 임성훈
    • 한국전기전자재료학회논문지
    • /
    • 제22권12호
    • /
    • pp.1073-1077
    • /
    • 2009
  • The iron core, which comprises the superconducting fault current limiter (SFCL) using magnetic coupling of coils, can be operated in the saturation region, especially at the initial fault period. This operation of the iron core in the saturation region deteriorates the fault current limiting operation of the SFCL. To solve the saturation problem of the SFCL using magnetic coupling of coils, the iron core with two magnetic paths, which has an air-gap in one of them, was adopted. In this paper, the hysteresis characteristics of SFCL using magnetic coupling of coils, which were wound in the iron core with two magnetic paths, were analyzed. Through comparative analysis on the hysteresis characteristics of the iron core comprising SFCL, the hysteresis characteristics of the iron core with two magnetic paths were confirmed to be kept in the non-saturation region during the fault period and thus, the effective fault current limiting operation of the SFCL using the magnetic coupling of coils could be performed.

자기베어링용 유도형 위치 센서의 성능에 미치는 와전류와 히스테레시스의 영향 (The Effects of Eddy Currents and Hysteresis on the Performance of Inductive Position Sensor for Magnetic Bearings)

  • 노명규;정민경
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2001년도 춘계학술대회논문집B
    • /
    • pp.36-41
    • /
    • 2001
  • The performance of an inductive position sensor is described by the accuracy and the dynamic characteristics of the sensor. Both of these performance indices are affected by magnetic hysteresis and eddy currents. In this paper, a model of an inductive sensor is presented. This model includes the effects of hysteresis and eddy currents. Computer simulation shows that the sensitivity of the sensor is greatly affected by hysteresis and eddy currents. Repeability error increases with hysteresis and eddy currents effects. Results also show that eddy currents influence more on the sensor performance than hysteresis does. To reduce the effects of hysteresis and eddy currents, the sensor should be made out of thin laminations with high resistivity.

  • PDF

Synthesis of SiAlON Ceramics with Novel Magnetic Properties

  • Karunaratne, Baththanamudiyanselage Samarakoon Bandara;Ko, Jae-Woong;Park, Young-Jo;Kim, Hai-Doo
    • 한국세라믹학회지
    • /
    • 제46권5호
    • /
    • pp.525-527
    • /
    • 2009
  • This paper presents a study on the magnetic behaviour of selected doped SiAlONs with various compositions including Y, Yb, Sm, Gd, and Er. The resulting crystalline phases were confirmed by X-ray diffraction. The magnetic hysteresis data for the samples were collected at room temperature using a vibrating sample magnetometer. The study revealed that doped SiAlONs experience an appreciable level of magnetic hysteresis. Although the parameters corresponding to hysteresis loops in doped SiAlONs are less than those of common ferrites, their magnetic properties of SiAlONs may open up new potential areas of application as the host SiAlON ceramics have excellent structural properties.

히스테리시스 특성을 고려한 전자계의 유한 요소 해석 (Finite Element Analysis of Electromagnetic Systems Considering Hysteresis Characteristics)

  • 김홍규;홍선기;정현교
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
    • /
    • 제48권3호
    • /
    • pp.118-123
    • /
    • 1999
  • This paper describes the finite element procedure including the magnetic hysteresis phenomena. The magnetization-dependent Preisach model is employed to simulate the magnetic hysteresis and applied to each elements. Magnetization is calculated by the Fibonacci search method for the applied field in the implementation of the magnetization-dependent model. This can calculate the magnetization very accurately with small iteration numbers. The magnetic field intensity and the magnetization corresponding to the magnetic flux density obtained by the finite element analysis(FEA) are computed at the same time under the condition that these balues must satisfy the constitutive equation. In order to reduce the total calculation cost, pseudo-permeability is used for the input for the FEA. It is found that the presented method is very useful in combining the hysteresis model with the finite element method.

  • PDF

자계 및 와전류 침수효과를 고려한 히스테리시스 전동기의 토오크에 대한 해석법 (An analysis on the torque of hysteresis-motor concerned with penetration-effect of magnetic -field and eddy-current)

  • 정연택
    • 전기의세계
    • /
    • 제29권9호
    • /
    • pp.594-598
    • /
    • 1980
  • This paper describes an analytical method on the starting torque of hysteresis motor, taking account of penetration effects of magnetic-field and eddy-current into the rotor, to the elliptical approximation method of hysteresis-loop. By the above method, it have obtained the torque of rotor ring with non-magnetic and non-conductive material arbor, and the results are concerned and compared with that of computed by aid of callibration factor, k=1+exp(-2t$_{r}$/.delta.).)

  • PDF

와전류와 히스테리시스를 고려한 유도형 변위 센서의 자기회로 모델 개발 (A Magnetic Circuit Model of Inductive Sensor Considering Eddy Currents and Hysteresis)

  • 노명규;정민경;박병철
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 2002년도 춘계학술대회 논문집
    • /
    • pp.267-270
    • /
    • 2002
  • The accuracy and the dynamic bandwidth are the two most important indices that an inductive position sensor is evaluated with. Eddy currents and magnetic hysteresis affect both of these performance indices. As the modulation frequency of the sensor increases to improve the dynamic bandwidth, the effects of eddy currents and hysteresis also increases, which results in the loss of accuracy. In this paper, a magnetic circuit model of the differential inductive sensor is developed. This model includes the effects of hysteresis and eddy currents. Experimental results confirm the validity of the model. The model predicts that the eddy current effects are not significant below the modulation frequency of 50kHz, as long as the lamination thickness is adequate.

  • PDF