• Journal of Electrical Engineering and Technology
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• 제11권6호
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• pp.1700-1706
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• 2016

In this paper, a dual-stator, spoke-type linear vernier machine (DSSLVM) for wave energy extraction application was proposed. This machine is capable of producing a competitively high thrust force and force density at a low operation speed in direct drive systems. The operation principal and working of the proposed DSSLVM were studied. The stator core height is adjusted to improve the overall force density of the proposed machine while reducing the force ripple. To evaluate the advantages of the proposed DSSLVM, the main performance was compared with that of a recently developed linear primary permanent magnet vernier machine (LPPMVM). The proposed machine exhibited greater thrust force and force density, an improved power factor and lower force ripple with the same permanent magnet (PM) volume compared to the LPPMVM.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.170-172
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• 2006

This paper proposes a design method by varying rotor pole shape to reduce cogging torque, torque ripple and harmonics of back emf in Spoke type brushless DC(BLDC) motor. In the process of design and analysis, Response surface method(RSM) and finite-element method(FEM) are employed to get the rotor geometry and verify the results of new pole shape.

• 전기학회논문지
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• 제56권5호
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• pp.860-868
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• 2007

In this paper. design of spoke type BLDC motor which have a characteristics of concentrating fluxes and relatively high reluctance torque among IPM BLDC motors has been researched. To reduce cogging torque and torque ripple. rotor pole shape of optimal design is proposed. To clearly see the effects due to the changed rotor pole shape. magnetic circuit model. 2D FEM and design of experiments (DOE) are used. Then considering these results proper rotor pole shape which have an good effect on air gap flux density and cogging torque. back-emf is designed. Moreover. the validity of proposed model in this paper is also verified by comparison between gained experiment and analysis data.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.848-849
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• 2015

This paper presents the structure design for optimizing output power density and efficiency to develop a spoke-type interior permanent magnet synchronous generator (IPMSG). To obtain the optimal structure, the combination of response surface method (RSM) and 2-D finite element analysis can solve the problem effectively for reducing the volume of permanent magnets (PMs) and maximizing the ratio between power density and efficiency. The effectiveness of this proposed structure design is verified by the simulation and experiment according to the comparison of the electromagnetic characteristics between the initial and modified structure.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.810-811
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• 2015

In this paper, we investigate the optimization design for a spoke type motor with the characteristics of high torque density and high-efficiency. This motor has a high output per unit volume. In order to reduce noise and vibration caused by a high cogging torque, optimization design of the rotor and stator have been conducted using both Response surface method (RSM) and Finite elements method (FEM). In this paper, we show the potential for this motor to efficiently replace existing interior permanent magnet synchronous motors (IPMSM) in a wide range of industries.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 B
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• pp.785-787
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• 2004

The purpose of this paper is characteristic analysis of permanent magnet generator for AVR power of brushless synchronous generator. However, the PMG has a spoke type rotor with overhang, so we perform the analysis considering overhang for the precise airgap flux density. In this paper, dynamic analysis model with 2D FEM considering overhang is proposed by use of 2D, 3D static FEM results. The proposed method is verified by the results of PMG load test.

• 전기학회논문지
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• 제65권2호
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• pp.360-364
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• 2016

The rare earth output is concentrated in limited number of countries including China. Also the necessity for development of non-rare earth motor is getting signified due to the rapid increase of rare earth price and resource weaponizing policies. Non-rare earth motor is generally designed as spoke type PMSM (Permanent Magnet Synchronous Motor) in order to maximize the power density. Such spoke type PMSM has advantage in concentrating the flux but demonstrates lower efficiency compared to permanent magnet using Nd (Neodymium) permanent magnet. Therefore, applications with strong necessity for efficiency need rotor structure having improved efficiency compared to spoke type PMSM. Hence, this study suggested fan-shape type PMSM with somewhat lower power density but maximized efficiency. Fan-shape type PMSM is a rotor shape demonstrating outstanding reduction of iron loss compared to existing spoke type. Thus, this study analyzed the improvement of efficiency and reduction of loss arising from the suggested shape through parameter calculation.

• 대한기계학회논문집A
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• 제35권10호
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• pp.1315-1321
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• 2011

제품 생산과 실험에 앞서 설계 단계에서의 강도 평가가 이루어져야 하며, 이 단계에서 범용 프로그램인 ANSYS 의 도입 및 활용은 제품의 생산과 강도 평가에 있어서 시간과 비용의 절감 등 여러 가지 이점을 갖게 한다. 본 연구에서는 ANSYS 를 이용하여 승용차용 디쉬 타입과 스포크 타입의 휠을 3 차원 형상으로 모델링하고 구조해석과 피로해석을 수행하였다. 디쉬 타입과 스포크 타입에 대한 해석 결과를 비교해 보면, 디쉬 타입이 스포크 타입보다 변형이 적게 일어나고 최대등가응력도 작음을 알 수 있다. 그럼에도 불구하고, 스포크 타입이 경량과 우수한 냉각성능으로 인해 자주 사용되고 있다. 수명에 대한 피로 해석 결과, 알루미늄 휠이 스틸 휠보다 피로 저항력이 우수함을 보였다.

• 한국생산제조학회지
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• 제21권5호
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• pp.733-740
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• 2012

This paper studies with structural and vibration analysis to evaluate the structural safety according to the types of steering wheels. This study models are two, three and four spoke types. As the number of spokes increases, the maximum equivalent stress becomes smaller but the maximum total deformation becomes a little higher. The natural frequency at three models are shown from 180 to 230Hz as the maximum deformation. The frequency responses as maximum amplitude displacement are happened at 200Hz, 500Hz and 500Hz respectively. In this study, the steering wheel with three spoke type is shown to become suitable at durability and production.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.720_721
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• 2009

일반적으로 BLDC 모터는 고효율 고토크의 특성을 가지고, 넓은 속도 범위에 걸쳐 높은 효율을 유지 하고 제어가 용이하므로 널리 사용 되고 있다. 이러한 BLDC 모터는 구동 원리에 의해서 역기전력의 파형이 구형파를 가지는 것이 유리하다. 또한 BLAC 모터는 효율, 역률, 전력밀도 및 토크 밀도가 높은 장점을 가지고 정현파 역기전력을 요구한다. 매입형 영구자석형 동기전동기 중 할박 구조로 인해서 자속을 집중 시키는 Spoke type 모터의 회전자 표면은 철심으로 이루어져 있기 때문에 회전자 표면의 형상을 Arc설계를 통해서 형상 최적화가 가능하다. 회전자 표면의 Arc 설계를 통해서 공극의 자속밀도 분포의 변화를 줄 수 있어 BLDC 구동 시 요구하는 구형파 역기저력 파형과 BLAC 구동 시 요구되는 정현파 역기저력 파형을 Arc 설계 각도에 따라 다르게 발생 시킬 수 있다. 이를 통해서 역기전력을 형태를 구형파와 정현파 형태를 가지도록 설계하여 BLDC와 BLAC 구동 시에 성능을 FEA를 통해서 비교 평가 하여, 구동 방식에 따른 Spoke type IPM 모터의 형상 설계방법을 제시한다.