• Title, Summary, Keyword: Mutual Inductance

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Estimation of Mutual Inductance Angle for 2-D Wireless Power Transfer System (2차원 무선전력전송 시스템의 상호 인덕턴스 각 추정)

  • Guo, Tianqi;Seol, Won-Kyu;Chung, Se-Kyo
    • Proceedings of the KIPE Conference
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    • pp.49-50
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    • 2017
  • In a two-dimensional wireless power transfer system, the mutual inductance angle is the most important parameter for determining the power transmission efficiency. This paper presents a technique to estimate the mutual inductance angle from the voltage and current information of the transmitting (Tx) coils. The equation to estimate the mutual inductance angle is derived, and the validity of the proposed method is verified through simulation and experiment.

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Mutual Inductance of the Non-Coaxial Coils in Coil Gun

  • Kim, Ki-Bong
    • Proceedings of the KIEE Conference
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    • pp.120-123
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    • 1994
  • The purpose of this paper is to describe the mutual inductance between two non-coaxial circular coils in coil gun. As being in many electromagnetic applications, one of them is fixed and the other one is moving and, being not supported, its axis may not coincide with the axis of the fixed coil. This paper presents a method for the calculation of the mutual inductance in case of non-coaxial coupled coils, the characteristics of this inductance and experimental results. For the computation, the complete elliptic integrals formula and mesh matrix technique were introduced. This method enables accurate results from relatively simple procedure and calculation program.

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A Novel Method for the Identification of the Rotor Resistance and Mutual Inductance of Induction Motors Based on MRAC and RLS Estimation

  • Jo, Gwon-Jae;Choi, Jong-Woo
    • Journal of Power Electronics
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    • v.18 no.2
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    • pp.492-501
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    • 2018
  • In the rotor-flux oriented control used in induction motors, the electrical parameters of the motors should be identified. Among these parameters, the mutual inductance and rotor resistance should be accurately tuned for better operations. However, they are more difficult to identify than the stator resistance and stator transient inductance. The rotor resistance and mutual inductance can change in operations due to flux saturation and heat generation. When detuning of these parameters occurs, the performance of the control is degenerated. In this paper, a novel method for the concurrent identification of the two parameters is proposed based on recursive least square estimation and model reference adaptive control.

Load and Mutual Inductance Identification Method for Series-Parallel Compensated IPT Systems

  • Chen, Long;Su, Yu-Gang;Zhao, Yu-Ming;Tang, Chun-Sen;Dai, Xin
    • Journal of Power Electronics
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    • v.17 no.6
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    • pp.1545-1552
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    • 2017
  • Identifying the load and mutual inductance is essential for improving the power transfer capability and power transfer efficiency of Inductive Power Transfer (IPT) systems. In this paper, a steady-state load and mutual inductance identification method focusing on series-parallel compensated IPT systems is proposed. The identification model is established according to the steady-state characteristics of the system. Furthermore, two sets of identification results are obtained, and then they are analyzed in detail to eliminate the untrue one. In addition, the identification method can be achieved without extra circuits so that it does not increase the complexity of the system or the control difficulty. Finally, the feasibility of the proposed method has been verified by simulation and experimental results.

Study on the Parameter Identification for Induction Motors (유도 전동기 파라미터 추정에 관한 연구)

  • 김규식
    • Proceedings of the KIPE Conference
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    • pp.199-202
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    • 2000
  • The accurate identification of the motor parameters in crucially important to achieve high dynamic performance of induction motors. In this paper parameter auto-tuning algorithms for stator(rotor) resistance stator(rotor) leakage inductance mutual inductance and rotor inertia. Stator(rotor) resistance and stator(rotor) leakage inductance are identified based on the stationary coordinate and mutual inductance and rotor resistor on the scalar speed control and the transient motor terminal voltage. To demonstrate the practical significance of our results we present some experimented results.

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Analysis of Current Distribution with Design Parameters of HTS Cable with Multi-Layer (다층 고온초전도 전력케이블의 설계 파라미터를 통한 전류분류 해석)

  • Lee, Jong-Hwa;Lim, Sung-Hun;Ko, Seok-Cheol;Park, Sig;Kang, Hyeong-Gon;Han, Byong-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.589-592
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    • 2003
  • One important issue in the design and the optimization for conductor of a superconducting cable is the control of the current distribution flowing at each layers. In this paper, we calculated the self inductance of each layer and the mutual inductance between two layers from the magnetic field energy and investigated the effects of design parameters on the self and mutual inductances for 4-layer conductors with transport current distribution at each layer.

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A Study on the Distance Between the Track Circuits Using Identical Frequency in Railway Track Circuit System (철도궤도회로시스템에서 동일한 주파수를 사용하는 궤도회로 사이의 이격거리에 대한 연구)

  • Kim, Min-Seok;Lee, Jong-Woo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.11
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    • pp.2168-2174
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    • 2009
  • Electrical railway system consists of rolling stock, track, signal and streetcar line system. Track circuit system is a vital system due to checking the location of trains. Track circuits are divided by using frequency and isolated electrically. Currently, there is not a regulation for the distance between track circuits using identical frequency. In case of installing additional track circuits in large stations or marshalling yard, the problem which is that the signal is not exactly transmitted to the track circuit occurs due to the mutual interference. In other words, the track circuit properly is not operated on account of wrong induction current by the mutual inductance between track circuits. In this paper, we suggest the electrical model between track circuits and numerically calculate demanded parameters in electrical model. The distance between track circuits satisfying the mutual inductance which does not happen to the mutual interference phenomenon is presented about the distance of track circuit. It is proved by using Matlab and PSpice program as the amplitude of mutual induced current.

Alternative Expressions for Mutual Inductance and Coupling Coefficient Applied in Wireless Power Transfer

  • Kim, Gunyoung;Lee, Bomson
    • Journal of electromagnetic engineering and science
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    • v.16 no.2
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    • pp.112-118
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    • 2016
  • Alternative analytic expressions for the mutual inductance ($L_m$) and coupling coefficient (k) between circular loops are presented using more familiar and convenient expressions that represent the property of reciprocity clearly. In particular, the coupling coefficients are expressed in terms of structural dimensions normalized to a geometric mean of radii of two loops. Based on the presented expressions, various aspects of the mutual inductances and coupling coefficients, including the regions of positive, zero, and negative value, are examined with respect to their impacts on the efficiency of wireless power transmission.

Winding Inductance of High Speed Slotless Permanent-Magnet Brushless Machines (초고속 슬롯리스 영구자석 브러시리스 기기의 인덕턴스 특성)

  • Jang, S.M.;Ryu, D.W.;Jeong, S.S.;Choi, S.K.;Ham, S.Y.
    • Proceedings of the KIEE Conference
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    • pp.873-875
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    • 2000
  • The self- and mutual- winding inductances can have an important influence on both the steady-state and transient dynamic performance of a machine. Especially, slotless topologics have inherently low self- and mutual-stator winding inductance. Thus, this paper describes an analytical model for predicting the winding inductance and results are compared to finite element analyses.

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Calculating Mutual Impedance between Power-Line and Communication-Line with Earth Return Current (대지귀로 전류에 의한 전력선과 통신선의 상호임피던스 해석)

  • Lim, Yong-Hun;Hyun, Duck-Hwa
    • Proceedings of the KIEE Conference
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    • pp.269-271
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    • 2003
  • A method for calculation of mutual inductance from the parallel power-line and earth conduct to communication-line is studied in the paper. The solution for the electromagnetic field produced by an overhead power-line is derived using Maxwell's equations and treating the as a boundary value problem. Total mutual inductance from direct current and image current to communication-line is used Carson's formula for infinitely long parallel conductors.

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