• Title, Summary, Keyword: Overhang

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Overhang Effect on the Axial Flux Permanent Magnet Motor (AFPM 전동기의 오버행 효과에 관한 연구)

  • Woo, Dong-Kyun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.5
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    • pp.769-772
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    • 2016
  • In this paper, the overhang structure was applied to the axial flux permanent magnet (AFPM) motor. This paper describes the overhang effect in the AFPM motor. Moreover, the overhang effect was analyzed according to the different overhang length and an optimal overhang structure was proposed. Finally, the proposed structure was applied to design, analysis and experiment of prototype motors. Through the comparison between 3D finite element analysis results and experimental ones, the validity of proposed structure is clarified.

A Study on the Overhang Effect according to the Rotor Types of Permanent Magnet Machine (영구자석 회전자 타입에 따른 오버행 효과 고찰)

  • Kim, Ki-Chan;Kim, Sol;Ree, Cheol-Jick;Lee, Ju
    • Proceedings of the KIEE Conference
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    • pp.3-5
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    • 2005
  • The overhang parameter is required to maximize the power density of generator. However, the use of overhang design causes the rise of material cost. Moreover there is somewhat different overhang effect according to the rotor types. This paper presents the overhang effect on the overhang length according to the rotors with permanent magnet of generators. To examine the phenomenon of overhang effect, the new dynamic analysis method with 2D FEM is suggested and verified by the test results.

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Permanent Magnet Overhang Effect on the Characteristics in Brushless DC Motor (브러시리스 직류전동기 특성에 대한 영구자석 오버행 효과)

  • 전연도;약미진치;이주
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.53 no.4
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    • pp.229-236
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    • 2004
  • In this paper, the effect of permanent magnet overhang structure on the characteristics in Brushless DC motor has analyzed quantitatively. We classified the overhang structure as symmetric and asymmetric. 3D equivalent magnetic circuit network (EMCN) method which uses the permeance as the distributive variable is used for the efficient analysis of magnetic field. The overhang effect which increases the linkage flux at the stator is verified by comparison between overhang and no overhang structure. In addition, it is known that no load back electro motive force (EMF) is also increased due to the overhang effect. In case of asymmetric overhang structure, the ratio effect of the upper to lower overhang length on the magnetic forces is analyzed. Form the analysis results, the variation of the asymmetric overhang ratio has a significant effect on the axial magnetic force except the radial and tangential magnetic forces. The validity of the analysis results is also clarified by comparison between calculated results and measured ones such as back EMF and cogging torque.

The Study on a Dynamic Analysis of Permanent Magnet Generator considering Overhang Effect (오버행을 고려한 영구자석 동기 발전기의 동특성 해석 연구)

  • Kim, Ki-Chan;Lee, Ju
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.58-62
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    • 2006
  • The purpose of this paper is characteristic analysis of permanent magnet generator (PMG) for automatic voltage regulator (AVR)power of brush less synchronous generator. However, this PMG has a spoke type permanent magnet rotor with large overhang for high power density, characteristic analysis considering concentration effect of air-gap flux density due to the overhang should be performed. 30 transient finite element method (FEM)analysis is good solution for overhang parameter, but this method needs too much calculation time. In this paper, we examined the overhang effects based on overhang length and material of rotor core by using 20 and 30 static FEM analysis, and proposed 20 dynamic FEA model considering overhang parameter which gives good and rapid results. The proposed method is verified by the test results of no load, load and short circuit test.

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Permanent Magnet Overhang Effect in Permanent Magnetic Actuator Using 3 Dimension Equivalent Magnetic Circuit network Method

  • Lim Seung-Bin;Kwon Ho;Kwon Sam-Young;Choi Seung-kil;Baek Soo-Hyun;Lee Ju
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.5B no.2
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    • pp.123-128
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    • 2005
  • This paper presents an analysis of the permanent magnet overhang effect for the permanent magnetic actuator. Generally, the overhang is often used to increase the force density in permanent magnet machineries. The overhang is particularly profitable in reducing the volume after increasing the force density per volume when using the overhang effect of the permanent magnet. Therefore, the 3D Equivalent Magnetic Circuit Network Method (3D EMCN) has been used in this paper. According to the plunger position, the flux distribution per overhang length and the holding force are quantitatively compared. Furthermore, an appropriate length of the overhang has been proposed. To confirm the accuracy of the analysis method, the results of 2D FEM and 3D FEM are compared for the basic model.

2D Analysis Approach Method of a Small BLDC Motor Having Permanent Magnet Overhang Structure (영구자석 오버행 구조를 가진 소형 BLDC 모터의 2차원 해석 접근 방법)

  • Kim, Hoe-Cheon;Jung, Tae-Uk
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.26 no.7
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    • pp.39-44
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    • 2012
  • This paper deals with the characteristic analysis of small power brushless DC (BLDC) motor considering the rotor magnet overhang flux. In the driving characteristics analysis using 2D FEA (Finite Element Analysis), the rotor magnet overhang effect can't be considered and it should be neglected. To consider rotor magnet overhang effect, 3D FEA should be required. But 3D FEA requires very long calculation time even though the high specification computer is used. In this paper, the 3D electromagnetic model of BLDC motor is approximated as the 2D electromagnetic model considering overhang effect. In this paper, the concept of overhang coefficient is applied, and the coefficient according to load torque variance is deduced.

Analysis of an Interior Permanent-Magnet Machines with an Axial Overhang Structure based on Lumped Magnetic Circuit Model

  • Seo, Jangho;Seo, Jung-Moo
    • Journal of Magnetics
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    • v.21 no.1
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    • pp.94-101
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    • 2016
  • This paper shows a new magnetic field analysis of an interior permanent magnet (IPM) machines with an axial overhang structure wherein the rotor axial length exceeds that of the stator. The rotor overhang used to increase torque density of the radial flux machine is difficult to analyze because of extra consideration of axial direction, and thus it is general for machine designer to take 3-D finite element analysis (FEA) capable of considering both radial and axial complicated geometry in the machine. However, it requires too much computing time for preliminary design especially for optimization process. Therefore, in this paper a 2-D analytic method using a lumped magnetic circuit model (LMCM) is proposed to overcome the problem. For the analysis of overhang effect, the magnetic circuit is separated and solved from overhang and non-overhang regions respectively. For the validation of proposed concept, 3-D finite element analysis (FEA) is performed. From the analysis results, it is shown that our new proposed method presents good performance in terms of calculating electromotive force (EMF) and torque within a short time. Therefore, the proposed model can be useful in design of IPM with an overhang structure.

The Characteristic Analysis of Overhang Effect on Axial Flux Synchronous Motor (축방향 자속형 동기전동기의 오버행 효과에 따른 특성해석)

  • Lee, Byung-Jun;Won, Jin-Kook;Son, Dong-Hyeok;Cho, Yun-Hyun
    • Proceedings of the KIEE Conference
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    • pp.80-82
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    • 2007
  • This paper presents the overhang effects of a novel axial flux permanent magnet (AFPM) machine, which consist of the segmented stator and fractioned slot windings, with one rotor and double stator. In addition, the overhang effect of permanent magnet of the motor has been analyzed quantitatively. The overhang is used to enhance the force density in permanent magnet machine. According to the variation of overhang length, the flux density distribution and torque are quantitatively compared. For these analysis, three dimensional finite element method (3D FEM) has been used in this paper. From the results, the proper overhang length of PM is selected to improve the performance of the AFPM machine.

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Analysis and Modeling of Magnetic Characteristics in Surface-Mounted Permanent-Magnet Machines with Rotor Overhang

  • Yeo, Han-Kyeol;Woo, Dong-Kyun;Lim, Dong-Kuk;Ro, Jong-Suk;Jung, Hyun-Kyo
    • Journal of international Conference on Electrical Machines and Systems
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    • v.2 no.4
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    • pp.399-404
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    • 2013
  • The rotor overhang is used to enhance air-gap flux and improve power density. Due to asymmetry in the axial direction caused by the overhang, the time consuming 3D analysis is necessary to design the motor with overhang. To solve this problem, this paper proposes the equivalent magnetic circuit model (EMCM) that can consider overhang effects without the 3D analysis by using effective air-gap length. The analysis time can be reduced significantly via the proposed EMCM. The reduction of the analysis time is essential for the preliminary design of the motor. In order to verify the proposed model, the 3-D finite-element method (FEM) analysis is adopted. 3-D FEM results confirm the validity of the proposed EMCM.

Analysis of a Surface-Mounted Permanent-Magnet Machine with Overhang Structure by Using a Novel Equivalent Magnetic Circuit Model

  • Yeo, Han-Kyeol;Woo, Dong-Kyun;Lim, Dong-Kuk;Ro, Jong-Suk;Jung, Hyun-Kyo
    • Journal of Electrical Engineering and Technology
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    • v.9 no.6
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    • pp.1960-1966
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    • 2014
  • The rotor overhang is used to enhance the air-gap flux and improve the power density. Due to the asymmetry in the axial direction caused by the overhang, a time consuming 3D analysis is necessary when designing a motor with overhang. To solve this problem, this paper proposes an equivalent magnetic circuit model (EMCM) which takes account overhang effects without a 3D analysis by using effective air-gap length. The analysis time can be reduced significantly via the proposed EMCM. A reduction in the analysis time is essential for a preliminary design of a motor. In order to verify the proposed model, a 3-D finite-element method (FEM) analysis is adopted. 3-D FEM results confirm the validity of the proposed EMCM.