• Title/Summary/Keyword: Motor inductance

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Inductance Calculation in a Switched Reluctance Motor using Permeance Method (퍼미언스 방법을 이용한 스위치드 릴럭턴스 전동기의 인덕턴스 산정)

  • Lee, Cheewoo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.12
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    • pp.1836-1842
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    • 2012
  • Torque is proportional to the rate of change of inductance in a switched reluctance motor (SRM), and hence, phase inductance is an important parameter in determining the behavior of an SRM. Therefore, the accurate prediction of inductance with respect to rotor position makes a significant contribution to designing an SRM and its analytical approach is not straightforward due to nonlinear flux distribution. Although several different approaches using a finite element analysis (FEA) or curve-fitting tool have been employed to compute phase inductance [2-5], they are not suitable for a simple design procedure because the FEA necessitates a large amount of time in both modeling and solving with complexity for every motor design, and the curve-fitting requires the data of flux linkage from either an experimental test or an FEA simulation. In this paper, phase inductance is predicted by means of a permeance method, and the proposed approach is analytically verified in terms of the accuracy of estimated inductance compared to inductance obtained by FEA.

Analytical Estimation of Inductance at Aligned and Unaligned Rotor Positions in a Switched Reluctance Motor (스위치드 릴럭턴스 전동기의 회전자 정렬과 비정렬 위치에서의 인덕턴스 예측)

  • Lee, Chee-Woo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.1
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    • pp.34-40
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    • 2012
  • Flux linkage of phase windings or phase inductance is an important parameter in determining the behavior of a switched reluctance motor (SRM) [1-8]. Therefore, the accurate prediction of inductance at aligned and unaligned rotor positions makes a significant contribution to the design of an SRM and its analytical approach is not straightforward due to nonlinear flux distribution. Although several different approaches using a finite element analysis (FEA) or curve-fitting tool have been employed to compute phase inductance [2-5], they are not suitable for a simple design procedure because the FEA necessitates a large amount of time in both modeling and solving with complexity for every motor design, and the curve-fitting requires the data of flux linkage from either an experimental test or an FEA simulation. In this paper, phase inductance at aligned and unaligned rotor positions is estimated by means of numerical method and magnetic equivalent circuit as well, and the proposed approach is analytically verified in terms of the accuracy of estimated inductance compared to inductance computed by an FEA simulation.

Inductance Estimation of Permanent Magnet Type Transverse Flux Rotating Motor Using Dynamic-Simulation (Dynamic-Simulation을 통한 영구자석형 횡자속 회전기의 인덕턴스 추정)

  • Kim, Kwang-Woon;Kim, Ji-Won;Jung, Yeon-Ho;Lee, Ji-Young;Kang, Do-Hyun;Chang, Jung-Hwan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.4
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    • pp.722-727
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    • 2010
  • This paper presents Dynamic-Simulation to estimate the inductance of a permanent magnet type transverse flux rotating motor by applying the real-time parameter estimation theory. As transverse flux rotating motor has the complex structure, it can be happen to some errors between real value and designed one with respect to the inductance. To reduce this kinds of errors, the real-time parameter estimation theory was applied to dynamic-simulation. And then, By comparing the estimated inductance and designed one, it is realized that the real-time parameter estimation theory can be applied in the permanent magnet type transverse flux rotating motor.

Design of Superconducting Synchronous Motor using EMF-Inductance Map (EMF-Inductance Map을 이용한 초전도 동기 전동기의 설계)

  • Lee, Ji-Young;Bahn, Ji-Hyung;Hong, Jung-Pyo;Jo, Young-Sik;Kwon, Young-Kil
    • Proceedings of the KIEE Conference
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    • 2005.07b
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    • pp.1213-1215
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    • 2005
  • For synchronous motor, back-EMF and inductance have mainly effect on the characteristics of the motor. Therefore inductance and back-EMF ranges should be limited to obtain desirable characteristics, and it is possible to get design goal easily by adjusting those two parameters. In this paper EMF-Inductance Map(E-L Map) is presented in order to predict the performance of a motor in initial design. By applying the E-L map to design process of 1MW super-conducting synchronous motor it's usefulness is verified.

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A Study on the inductance operation for rotor position estimation of SR Motor (스위치드 릴럭턴스 전동기의 회전자 위치 검출을 위한 인덕턴스 연산에 대한 연구)

  • Na, Jong-Duk;Chung, Byun-Ho;Kim, Ji-Hoon;Choi, Youn-Ok;Cho, Guem-Bae;Baek, Hyung-Lae
    • Proceedings of the KIEE Conference
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    • 2005.07b
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    • pp.1441-1443
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    • 2005
  • In this paper proposes a very simple method to estimate the rotor position of a switched reluctance motor. By on-line estimating the self-inductance of the motor, the rotor position of the SR motor is obtained, and a closed-loop drive system can be achieved. Proposed methods can easy implement to application with sensorless SR motor drive system. SR motor simulation executed with self inductance estimation and result represented. Simulation result verified the rotor position using the proposed self-inductance estimation method.

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Design of Magnetic Circuit of Line-start Permanent Magnet Synchronous Motor to Develop the Characteristics at the Steady State (정상상태 특성 개선을 위한 단상 영구자석형 동기기의 자기회로 설계)

  • Oh, Young-Jin;Nam, Hyuk;Jung, Seung-Kyu;Hong, Jung-Pyo;Jung, Tae-Uk;Baek, Seung-Myun
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.52 no.6
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    • pp.254-261
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    • 2003
  • This study investigates magnetic circuit design of the Single-phase Line-start Permanent Magnet Synchronous Motor (LSPM) to develop the characteristics in steady state. In this paper, the saliency ratio, that is the ratio of q-axial inductance to d-axial inductance, and the inductance difference between q-axial inductance and d-axial inductance are increased. Design factor is selected permanent magnet position and rotor diameter. The analysis method of the synchronous motor on d-/q- axis coordinates is used for the positive component and the equivalent circuit of the induction motor is applied for the negative component analysis. Back-emf and d-q- axial inductance is analyzed by using 2 dimensional Finite Element Method (FEM). Characteristic analysis results with variation of design factor are reflected magnetic circuit design of LSPM. The characteristics of design model are compared with the characteristic of initial model.

Inductance Analysis of Interior Permanent Magnet Synchronous Motor Considering Cross-Coupling Effect (교차 결합 현상을 고려한 매입형 영구자석 전동기의 인덕턴스 특성 해석)

  • Kwak, Sang-Yeop;Kim, Jae-Kwang;Jung, Hyun-Kyo;Lee, Sang-Yub
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.55 no.4
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    • pp.189-195
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    • 2006
  • In this paper, the inductance characteristics of interior permanent magnet synchronous motor (IPMSM) considering cross-coupling effect is analyzed. It is known that the IPMSM has it's operating point at the saturated region. So the cross-coupling effect exists, therefore cross-coupling inductance exists. With the application of Fixed Permeability Method (FPM), we can obtain more exact inductance characteristics of IPMSM. In this paper, a novel method based on the FPM is proposed, which can consider the cross-coupling effect. And the cross-coupling inductance which is the analysis result is shown. Finally, the validity of proposed method is verified by the comparison with the experimental result.

Torque-speed Characteristic Analysis of Brushless Motor according to the change of Inductance in rotor position (변위에 따른 인덕턴스 변화를 고려한 브러시리스 전동기의 토크-속도 특성 해석)

  • Lee, Jea-Keon;Lee, Jung-Jong;Kwon, Soon-O;Hong, Jung-Pyo
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.844_845
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    • 2009
  • Inductance and back EMF are important parameters in characteristic analysis of brushless motor. Inductance is constant value in surface permanent magnet type brushless motor. But it is change depending on the position of the rotor in interior permanent magnet type brushless motor. So this paper is considering for change inductance in characteristic analysis of brushless motor. Characteristic analysis is executed by the method that three-phase bipolar 120 degree commutation drive type.

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Dynamic Analysis of a 3-Phase BLDC Motor Considering Variation of an Air-Gap (공극의 시간변화를 고려한 3 상 BLDC 모터의 동특성 해석)

  • Park, Ki-Sun;Im, Hyung-Bin;Chung, Jin-Tai
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.33 no.10
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    • pp.1038-1044
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    • 2009
  • In this study, vibrations of an electric motor are analyzed when the motor has the interaction between mechanical and electromagnetic behaviors. For this vibration analysis a 3-phase 8-pole brushless DC motor is selected. Vibrations of the motor are influenced by coupled electromechanical characteristics. The variation of air-gap induced by vibration has an influence on the inductance of the motor coil. To analyze dynamic characteristics of the rotor, we studied inductance by the variation of an air-gap. After obtaining the kinetic, potential and magnetic energies for the motor, the equations of motion are derived by using Lagrange's equation. By applying the Newmark time integration method to the equations, the dynamic responses for the displacements and currents are computed.

Torque Characteristics by the Inductance Profiles of a Switched Reluctance Motor (Switched Reluctance Motor에서 인덕턴스 프로필에 따른 토오크 특성)

  • Kong, Gwan-Sik;Park, Han-Woong;Ahn, Jin-Woo;Hwang, Young-Moon
    • Proceedings of the KIEE Conference
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    • 1992.07b
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    • pp.597-599
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    • 1992
  • A calculation method for predicting the instantaneous torques by the inductance profiles of a switched reluctance motor (SRM) is presented. The method considers saturation and nonlinearities in the magnetic circuits. The inductance of SRM varies complex according to the input current waveforms and rotor position angle, thus the accurate calculation technique is needed to estimate the inductance value at arbitary input current and rotor position angle. This paper describes how the inductance profiles influence the torque produced by the input current of SRM and, proposes a calculation technique of the permeabilities, reluctances, current waveforms and torques of a 6/4 3-phase SRM.

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