• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2024년도 제69차 동계학술대회논문집 32권1호
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• pp.271-272
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• 2024

현재 자동차 산업은 내연기관에서 전기차 시스템으로 접어들고 있다. 전 세계적으로 탄소 중립 정책이 이를 가속화하고 있으며, 자동차 제조사들은 기존 내연기관 시스템으로는 불가능했던 기술들을 개발하고 있다. 대부분의 전기차에는 PMSM이 적용되고 있는데 부피가 크고 무거우며 토크 밀도가 낮다는 단점이 있다. AFPM은 기존 PMSM의 단점을 개선한 모터로, 부피와 무게가 작으며 토크밀도가 높다는 장점이 있어 전기차의 In-Wheel Motor System과 UAM에 적용되는 모터이다. 하지만 전기차는 도로 주행만 가능하고 UAM은 비행만 할 수 있기 때문에, 미래 모빌리티인 전기자동차와 UAM이 통합된 모빌리티를 개발하고자 한다. 본 과제에 적용되는 AFPM모터는 PMSM의 단점을 보완할 수 있기 때문에 전기차-UAM 트랜스포밍 모빌리티의 모터로 적합하다. 이 모빌리티는 자동차와 UAM의 역할을 모두 수행할 수 있어 효율적인 이동을 돕고 도시의 교통 인프라 문제를 완화할 수 있다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 B
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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.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 B
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• pp.1180-1182
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• 2005

In this paper, the design and field analysis of the novel axial flux type permanent magnet(AFPM) motor with double stator and single rotor are investigated. The various design schemes of AFPM based on 3D finite element method are proposed. The effects of slot shapes, various magnetization of PM, and skewing on the cogging torque and average torque have been investigated in detail. From the results, we can improve the cogging torque and average torque characteristics.

• 조명전기설비학회논문지
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• 제26권2호
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• pp.71-77
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• 2012

The cogging torque is important to the cut-in wind speed. And, it causes the acoustic noise and the vibration on the machine. This paper presents a 3D FEA(Finite Element Analysis) to evaluate the effect of magnet skew and stator displacement on cogging torque reduction, for double core AFPM(Axial Flux Permanent Magnet) generator. As a result, the magnet skew and the stator side displacement are proved excellent techniques to reduce the cogging torque.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 B
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• pp.773-774
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• 2006

Nowadays, the global interests are concentrated on the preserving of the clean environment, and the diminishing of the dependence on the fossil energy, and among the possible alternative energies, the wind turbine generating system is considered to be the best suited to produce high efficiency energy, without affecting the natural environment. The permanent magnet generators were been used for the wind power generating, for long time, with continuous efforts to improve the generating efficiency. And the latest trend on it is to develop an AFPM(Axial Flux Permanent Magnet)type, which is composed in the structure of rotor and stator shaped in the disc forms, and the direction of the flux at the air gap runs in parallel to the shaft. This thesis is on the study concerning with the analysis of the characteristics of the 5 kW at 300rpm direct drive AFPM generator which is suitable for the small scale wind turbine generating system. In it, the Electro-magnetically Coreless AFPM was been analyzed, the prototype generators been made, concentrated on interpreting the characteristics of the power output, and verifying it through the theoretical study and practical tests.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2015년도 추계학술대회 논문집
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• pp.217-218
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• 2015

Two axial flux permanent magnet (AFPM) machines using soft magnetic composite (SMC) and lamination steel are studied. Generally stator cores of AFPM machines are manufactured using SMC because AFPM machines need 3 dimensional core structures. However, SMC cores have very disadvantages in magnetic properties. Especially permeability value is much lower than that of lamination steel, so magnetic field density is also lower. In terms of core losses, SMC cores have much larger loss values than lamination steel cores because SMC core can't be laminated. In this study, AFPM machine was designed using laminated steel, and iron losses in two machines using SMC and laminated steel were studied. Simulations were carried out by a commercial 3-D FEM tool.

• 전력전자학회논문지
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• 제11권3호
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• pp.284-291
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• 2006

최근 가전 및 자동차시스템의 전동화에 따라 고효율 전동기에 대한 관심이 고조되고 있다. 따라서 본 논문에서는 고속구동시 고효율구동이 가능한 코어없는 AFPM전동기의 운전특성에 대해서 기술하고 설계관점에서의 그 전기적 특징에 대해서 논의한다. 특히 전동기 특성에 큰 영향을 미치는 역기전력 및 공극에서의 자계특성을 보이고 또한 인덕턴스특성에 따른 제어특성에 대해서도 시뮬레이션 및 실험을 통해 고찰한다. 회로망법을 기초로한 전동기설계결과와 출력특성실험결과의 비교검토를 통해 토크-속도 및 효율운전특성을 확인하였으며 제어특성을 확인한다. 아울러 코어가 없어짐에 따라 생길 수 있는 진동 및 소음특성에 대해서도 평가한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.1019-1020
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• 2011

This paper deals with torque analysis of axial flux permanent magnet (AFPM) type eddy current brake (ECB) based on analytical field computation. On the basis of a magnetic vector potential and a two-dimensional (2-D) polar coordinate system, analytical solutions for normal and tangential flux density due to permanent magnet (PM) considering eddy current effect are obtained. And then, using derived analytical field solutions, braking torque and normal force characteristics according to rotor speed are also predicted. A three-dimensional (3-D) finite element (FE) analysis is employed to confirm the validity of analyses.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.145-146
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• 2015

도심형 소형풍력발전기의 효율 및 기동특성을 향상시키기 위한 무철심형 AFPM 발전기를 설계하였다. 기존에 주로 사용되었던 수평축 발전기보다는 효율 및 발열과 소형화에 유리한 AFPM(Axial Flux Permanent Magnet) 발전기가 적합하고, AFPM 발전기는 단위 무게당 출력이 크고 고에너지 밀도를 갖도록 설계가 가능하며 발전기의 효율적인 냉각 및 Slim형으로 제작이 가능하다. 본 논문에서는 도시형 풍력발전시스템에 적합한 풍력발전기 개발을 위한 무철심형(Coreless) AFPM 발전기의 설계와 및 전자기적 성능해석을 통하여 본 설계의 유효성을 확인하고 이를 제안하였다.

• Journal of Magnetics
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• 제16권4호
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• pp.374-378
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• 2011

Axial Field Permanent Magnet (AFPM) generators are widely applied for the small wind turbine because of the higher power density per unit weight than that of the conventional radial field generator. It is caused by the disc shaped rotor and the stator structures. The generally used AFPM generator, AFER-NS generator, is composed of the two side's external rotors and non-slotted stator without stator core. However, the output voltage and the output power are limited by the large reluctance by the long air-gap flux paths. In this paper, the design study of AFIR-S generator having double side's slotted stator core is accomplished to improve the output generation characteristics. The electromagnetic design analysis and the design improvement of the suggested AFIR-S generator are studied. Firstly, the electromagnetic design analysis was done to increase the power density. Secondly, the design optimizations of the rotor pole-arc ratio of permanent magnet are accomplished to increase the output power and to reduce the cogging torque. Finally, the output performances of AFER-NS and AFIR-S generator are compared with each other. For this study, 3D FEA is applied for the design analysis because of three dimensional electromagnetic structures.