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

Chung, Dae-Won; You, Yong-Min

doi:10.4283/jmag.2014.19.3.273

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

Journal of magnetics, v.19 no.3, 2014년, pp.273 - 281

Chung, Dae-Won (Department of Electrical Engineering, Honam University) , You, Yong-Min (Department of Electrical Engineering, Honam University)

Abstract ▼ AI-Helper

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.

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제안 방법

Performance tests on the prototype AFPM machine were carried out in the laboratory, and the results were analyzed. The tests focused on power generation, including terminal voltage, output power, and efficiency.
The modeling process consisted of design calculations and FEA to predict the performance of the candidate designs. The dimensions and materials were selected using the design and modeling procedure proposed by Miller [9, 14].
Performance tests on the prototype AFPM machine were carried out in the laboratory, and the results were analyzed. The tests focused on power generation, including terminal voltage, output power, and efficiency. A reconfigurable water-cooled bank of resistors was configured into a balanced three-phase load and then connected across the AFPM machine terminals.

이론/모형

The modeling process consisted of design calculations and FEA to predict the performance of the candidate designs. The dimensions and materials were selected using the design and modeling procedure proposed by Miller [9, 14]. By applying Galerkin's method to the magnet vector potential in the magnetic circuits, the FEA for the machine is not required to solve this analytically[15].
The optimization algorithm of incomplete Choleski conjugate gradient method (ICCG iterative solver) [17] was used for this solution. Figure 5 shows a power density plot as a function of the air-gap flux density obtained from the variables and the ratio k_d for the machine.

성능/효과

The FE analysis gave results that are acceptable agreement with the design optimization, as regards the air-gap flux density, the induced phase voltage, the output power, and the cogging torque. 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. This proposed design method will be applied to multiple-rotor AFPM machines together with other variable technologies further.

후속연구

This paper proposes a systematic optimal design methodology for an axial-flux permanent-magnet brushless machine with a coreless stator and rotor for use with small wind turbines. Both analytical and electromagnetic 3-dimensional finite element analysis (3D FEA) models are employed to calculate the parameters of the machine and to further analyze and optimize the generator's performance.

참고문헌 (20)

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

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

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