• Title, Summary, Keyword: magnetic circuit analysis(자기회로해석)

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Modeling of an Inductive Position Sensing System based on a Magnetic Circuit and its Analysis (자기 회로를 이용한 인덕턴스형 변위 측정 시스템의 모델링 및 해석)

  • Choi, Dong-June;Rim, Chun-Taek;Kim, Su-Hyeon
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.6
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    • pp.93-101
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    • 2001
  • This paper presents modeling of an inductive micro position sensing system and its analysis. The parameters affected the system response are excitation frequency, turn ratio, input position, air-gap size, load resistance, and geometric dimensions. To analyze the system, we try to establish a modeling based on an equivalent magnetic circuit with permeances. The model is verified by the experimental results from 1 kHz to 20 kHz. The magnetic circuit model is well fitted to the experimental data except a little error due to LC resonance in the large turn-ratio system. Modeling enables us to theoretically approach the response characteristics. Based on the magnetic circuit model, system parameters can be selected in such a way to obtain the required characteristics such as high sensitivity, good linearity, or small size.

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Analysis on the Levitation Force Characteristics of Longitudinal Flux Type Levitation Magnet using Equivalent Magnetic Circuit Model (등가자기회로 모델을 이용한 종자속형 자기부상 전자석의 부상력 특성 해석)

  • Cho, Han-Wook;Kim, Chang-Hyun;Lee, Jong-Min;Han, Hyung-Suk
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.12
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    • pp.2236-2245
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    • 2011
  • This paper deals with the levitation force characteristics of electromagnet for MAGLEV vehicle application. The magnetic flux density distribution and levitation force characteristics of the electromagnet are investigated by means of equivalent magnetic circuit model. Firstly, we defined the aligned and unaligned electromagnet module for the full-electromagnet, and magnetic flux paths are represented for each model including leakage and fringing flux paths. Because of the analysis model contains both the permanent magnet and electromagnet coil, we calculated the airgap magnetic flux density and levitation forces using flux superposition in electromagnetic circuit. The results are validated extensively by comparison with finite element analysis. Moreover, the 1/4 scaled magnetic levitation and propulsion test vehicle has been manufactured and tested in order to verify these predictions. The experimental results confirms the validity of the analytical prediction with equivalent magnetic circuit model for the description of a electromagnet.

The design of magnetic circuit of magnetostrictive actuator using finite element method (유한 요소 해석을 통한 자기변형 구동기 자기 회로 설계)

  • 이석호;박영우
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.548-551
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    • 2004
  • Magnetostrictive actuators have seen increasing use in fine positioning system because it has many advantages such as friction free, resolution of ${\mu}{\textrm}{m}$ or nm scale, and powerful output force. Usually, the magnetic circuit of magnetostrictive actuator has components which are flux return path, coil, and magnetostrictive material. It is classified in two types according to existence of the permanent magnet. The magnetic circuit having optimal performances transfer magnetic field which is obtained by providing input current at coil without energy loss. This paper described mathematical model of magnetic circuit for getting design variables. The modeling equation is obtained from the relations between flux and reluctance of the magnetic equivalent circuit. Also, finite element analysis has been used to study the performance of magnetic circuit according to change of design variables such as existence and shape of the permanent magnet, flux return path etc. The modification of dimensions enables us to optimize magnetic circuit.

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An analysis of transient state for induction motor by using the magnetic equivalent circuit method (자기등가회로법에 의한 유도전동기 과도상태해석)

  • Jeong, Jong-Ho;Lee, Eun-Woong;Cho, Hyun-Kil;Kim, Jun-Ho;Lee, Hwa-Su
    • Proceedings of the KIEE Conference
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    • pp.18-20
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    • 2002
  • In this paper, the construction elements of the induction motor was represented by the magnetic tube. The magnetic tube is basis of the magnetic equivalent circuit. The magnetic equivalent circuit method is convenient of complicated analysis of the transient state of the induction motor. Because the method is restriction on only one direction of magnetic flux. Air gap magnetomotive force was calculated by magnetic equivalent circuit method. Starting transient torque and phase current of the induction motor was confirmed by the theoretical calculation and the experiments.

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Skew Analysis of Synchronous Reluctance Motor Using Equivalent Magnetic Circuit Method (등가자기회로법을 이용한 동기형 릴럭턴스 전동기의 스큐해석)

  • Ahn, Joon-Seon;Lim, Seung-Bin;Kim, Sol;Lim, Seong-Yeop;Kwon, Sam-Young;Lee, Ju
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.55 no.3
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    • pp.123-130
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    • 2006
  • This paper presents characteristics analysis of skewed Synchronous Reluctance Motor using equivalent magnetic circuit and compares with the result of Finite Element Method. Torque ripple must be reduced, because it is producing noise and vibration. There is many kinds of method to reduce torque ripple, but generally we apply skewing stator or rotor. The 2D Finite Element Method(FEM) or 3D FEM is used to analyze the motor, since skew influence the average torque in the motor. However, the FEM takes much time in spite of the advanced computer and numerical technique. This paper will analyze characteristics of skewed synchronous reluctance motor using equivalent magnetic circuit.

Design and Analysis of linear motor for slim-line ODD (소형 ODD용 선형 구동기의 설계 및 특성 해석)

  • Shim, Min-Taek;Park, Joon-Hyuk;Baek, Yoon-Su
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.378.2-378
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    • 2002
  • This paper deals with a moving coil type linear motor for fast access of the miniature ODD. This slim-line motor is composed of the mover supported by guide mechanism, the coil wound into it, and the yoke attached to the permanent magnet for stator. The driving force is generated by the PM of the stator and the current in the coil of the mover. Magnetic circuit analysis and Finite Element Method are applied to estimate force at air gap. (omitted)

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Analysis of distributed MMF on tooth for induction motor using Magnetic Equivalent Circuit (자기등가회로법에 의한 유도전동기의 치기자력 분포해석)

  • Jeong, Jong-Ho;Lee, Eun-Woong;Lim, Su-Saeng;Kim, Jun-Ho
    • Proceedings of the KIEE Conference
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    • pp.638-640
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    • 2001
  • In this paper, system equation of the magnetic equivalent circuit of the induction motor be consist of the magnetomotive force transformation matrix and the flux transformation matrix. The system equation is fed by three phase sinusoidal current and get to magnetomotive force on the teeth. This study confirmed the time and spatial distribution of the magnetomotive force on the teeth created by the winding.

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A Study on the Vibration Analysis of Linear Stepping Motor using FEM and ACSL (유한요소법과 ACSL을 이용한 Linear Stepping Motor의 진동해석에 관한 연구)

  • 이상호;정도영
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.18 no.1
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    • pp.122-128
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    • 2004
  • In this paper, the vibration characteristics of a linear stepping motor(LSM) are analyzed using the ACSL. A magnetic equivalent circuit is based on the structure of the LSM, and then the electric equivalent circuit of the LSM is derived by solving equations for the magnetic equivalent circuit. A normal force is calculated using finite element method(FEM). And the vibration characteristics(continuous vibration) of the LSM are simulated by the ACSL(Advanced Continuous Simulation language) with the voltage equations, the thrust equation, the normal force equation and the kinetic equation.

Torque Analysis of Rotary Actuator Using Equvalent Magnetic Circuit method in combination with finite element method (등가자기회로법과 유한요소법을 이용한 액츄에이터의 토크특성 해석)

  • Kim, Young-Kyoun;Hong, Jung-Pyo;Kim, Je-Deok
    • Proceedings of the KIEE Conference
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    • pp.605-607
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    • 2000
  • Although Equvalent Magnetic Circuit (EMC) method. Using lumped parameter and numerical analysis method are widely used for electric machine analysis. these are neither always accurate enough nor sometimes available to easily use. Moreover three dimensional finite element method (3D-FEM) is inherently unsuitable for electric machine performance evaluation due to its poor computational efficiency, such as too long calculation time and difficulty in modeling for analysis. In this paper, Nonlinear Equivalent Magnetic Circuit (NEMC) method in combination with 2D-FEM is proposed to analyze the electric machine requiring 3D-FEM, and this method applys to torque evaluation for rotary actuator of Electro Magnetic Electronic Controller Power Steering (EM-ECPS).

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