• Title, Summary, Keyword: axial-flux permanent-magnet (AFPM)

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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.

Design of AFPM brushless DC Motor (AFPM brushless 직류전동기 설계)

  • Kong, Jeong-Sik;Oh, Chul-Soo
    • Proceedings of the KIEE Conference
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    • pp.9-11
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    • 1996
  • This paper is dealing with the slotless AFPM(Axial Flux Permanent Magnet) Brushless Motor. It has been reported that AFPM brushless DC motor have high efficiency and high energy density than radial flux permanent brushless DC motor. AFPM brushless DC motor finds its application of electric vehicles. In this paper, small AFPM brushless DC motor was designed using the ferrite permanent magnet. For this design, magnet of rotor, stator dimension and stator winding parameters has been studied and prototype AFPM motor has been assembled and motor speed, torque and efficiency are investigated.

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Design and Performance Analysis of Coreless Axial-Flux Permanent-Magnet Generator for Small Wind Turbines

  • Chung, Dae-Won;You, Yong-Min
    • Journal of Magnetics
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    • v.19 no.3
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    • pp.273-281
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    • 2014
  • This paper presents an innovative design for a low-speed, direct-drive, axial-flux permanent-magnet (AFPM) generator with a coreless stator and rotor that is intended for application to small wind turbine power generation systems. The performance of the generator is evaluated and optimized by means of comprehensive 3D electromagnetic finite element analysis. The main focus of this study is to improve the power output and efficiency of wind power generation by investigating the electromagnetic and structural features of a coreless AFPM generator. The design is validated by comparing the performance achieved with a prototype. The results of our comparison demonstrate that the proposed generator has a number of advantages such as a simpler structure, higher efficiency over a wide range of operating speeds, higher energy yield, lighter weight and better power utilization than conventional machines. It would be possible to manufacture low-cost, axial-flux permanent-magnet generators by further developing the proposed design.

The Comparison of Output Characteristic by the Electro-magnetic Structure Modification of the Axial Flux Type Permanent Magnet Synchronous Generator (종축 자속형 영구자석 동기 발전기의 전자기적 구조 변경에 따른 출력특성 비교)

  • Jung, Tae-Uk;Bae, Byung-Duk;Kim, Hoe-Cheon
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.25 no.6
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    • pp.42-48
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    • 2011
  • Generally, the structure without the stator core Axial Field Permanent Magnet (AFPM) generator was simple and there was nearly no cogging toque. And because it had the wide driving rate area, it had been being mainly used in the small wind power generation system. However, AFPM generator with non-slotted stator can't generate high voltage at low wind speed due to long air-gap. It is the reason of output efficiency drop. Therefore, in this paper, the AFPM synchronous generator with internal rotor and dual slotted stators for the small wind turbine is studied, and deal with a cogging torque minimization through the determination of optimum pole-arc ratio.

Quasi-3D analysis of Axial Flux Permanent Magnet Rotating Machines using Space Harmonic Methods (공간고조파법을 이용한 축 자속 영구자석 회전기기의 준(準)-3D 특성 해석)

  • Choi, Jang-Young
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.5
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    • pp.942-948
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    • 2011
  • This paper deals with characteristic analysis of axial flux permanent magnet (AFPM) machines with axially magnetized PM rotor using quasi-3-D analysis modeling. On the basis of magnetic vector potential and a two-dimensional (2-D) polar-coordinate system, the magnetic field solutions due to various PM rotors are obtained. In particular, 3-D problem, that is, the reduction of magnetic fields near outer and inner radius of the PM is solved by introducing a special function for radial position. And then, the analytical solutions for back-emf and torque are also derived from magnetic field solutions. The predictions are shown in good agreement with those obtained from 3-D finite element analyses (FEA). Finally, it can be judged that analytical solutions for electromagnetic quantities presented in this paper are very useful for the AFPM machines in terms of following items : initial design, sensitivity analysis with design parameters, and estimation of control parameters.

The Study of Overhang Effect of a Novel Axial Flux Permanent Magnet Motor with a Double sided Airgap (양측면식 평판형 영구 자석 동기 전동기의 오버행 효과에 관한 연구)

  • Jo, Won-Young;Lee, In-Jae;Kim, Byung-Kuk;Kim, Tae-Hyun;Hwang, Dong-Won;Cho, Yun-Hyun;Chun, Yon-Do
    • Proceedings of the KIEE Conference
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    • pp.1174-1176
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    • 2005
  • The permanent magnet(PM) overhang effect has been generally used to enhance the linkage flux in the motor. In this paper, we quantitatively investigate the PM overhang effect in the new type axial flux permanent magnet(AFPM) motor with a double-sided airgap. The motor performances such as linkage flux, back electromotive force(EMF), magnetic force, etc. were analyzed according to the variation of the overhang angle. From the results, we can select the proper overhang angle of PM which improves the performance of the AFPM motor.

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Characteristics Analysis of Double-layer AFPM Motor (Double-layer AFPM 전동기의 특성해석)

  • Kong, Jeong-Sik;Yoo, Hyune-O;Oh, Chul-Soo
    • Proceedings of the KIEE Conference
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    • pp.24-27
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    • 1999
  • This paper proposed a method to reduce torque ripple of double-layer axial flux permanent magnet motor. Torque is generated by interacting between current of stator winding and airgap flux. In the case of slotless axial flux permanent magnet motor, only commutation torque component is significant. Hence, cogging and reluctance torque will not be considered. For this propose, we were supplied differential phase current in each winding and shifted rotor magnet. According to shifted rotor magnet and flux and phase of current were shifted, phase of developed torque in each side is difference. As a result, we could reduce the total torque ripple in motor and obtain minimum torque ripple in the case of 7.5 degree shifting angle between two rotors.

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The Improved Quasi-3D FE Analysis on the AFPM Motor (개선된 Quasi-3D FEM을 통한 AFPM 전동기의 해석)

  • 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.773-776
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    • 2016
  • In the quasi-3D finite element(FE) anlysis, the overall characteristics of axial flux permanent magnet(AFPM) motor could be composed of each computation region. However, A drawback of quasi-3D FEM is not to consider the end effect on the stack end. To address this problem, an improved quasi-3D FE analysis which considers the end effect of the AFPM motor was proposed. From results the 3D FE analysis, the validity of the proposed method is verified.

Characteristics Analysis of Aixal Flux Permanent Magnet core-less motor (축 방향 자속 코어레스 전동기의 특성 해석)

  • Seo, Young-Taek;Kong, Jeong-Sik;Kim, Chul-Ho;Kim, Hyoung-Gil;Oh, Chul-Soo
    • Proceedings of the KIEE Conference
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    • pp.676-678
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    • 2002
  • This paper deals with the design and characteristic analysis of a coreless an axial flux permanent magnet (AFPM) motor. Axial-flux permanent magnet motors prove to be the best candidate for application in electric vehicles (EVs) as direct-drive wheel motors, as in comparison with conventional motors they allow design with higher compactness, lightness and efficiency. Recently, issues regarding environment and the diversification of dependence in oil are watched with keen interest. In this theses, through the simulation of AFPM for low and high torque which has stator in the center and two rotors each side, understand its specialty, with this, make a prototype motor and design drive which can enhance the motors stability in low speed. Especially, specialty of motors torque power output will be mainly talked and based on this, possibility of application in EVs will be inspected by the theoretical study and the test.

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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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