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풍력발전용 2MW급 방사 자속형 영구자석 동기발전기와 축방향 자속형 영구자석 동기발전기 설계 및 비교

Design and Comparison between 2MW Class RFPM and AFPM for Wind Turbine

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초록 moremore
Most of the permanent magnet generator type for wind turbine as MW-class applications is RFPM(Radial Flux Permanent Magnet) type. In this study, it is concluded that MW-class AFPM(Axial Flux Permanent Magnet) type generator has its own characteristics which are compactness in volume, cost reduction especially in magnet portion, and lower efficiency than RFPM type. To compare AFPM with RFPM, a 2MW Hyundai Rotem Direct-drive RFPM type generator is redesigned as a 2MW AFPM machine. A newly designed 2MW AFPM machine has the shape of double-sided stator and single rotor which is called AFIPM(Axial Flux Interior Permanent Magnet) topology. FEM[Ansys] simulation is conducted based on Quasi-3D method to perform electromagnetic and thermal analysis.
Most of the permanent magnet generator type for wind turbine as MW-class applications is RFPM(Radial Flux Permanent Magnet) type. In this study, it is concluded that MW-class AFPM(Axial Flux Permanent Magnet) type generator has its own characteristics which are compactness in volume, cost reduction especially in magnet portion, and lower efficiency than RFPM type. To compare AFPM with RFPM, a 2MW Hyundai Rotem Direct-drive RFPM type generator is redesigned as a 2MW AFPM machine. A newly designed 2MW AFPM machine has the shape of double-sided stator and single rotor which is called AFIPM(Axial Flux Interior Permanent Magnet) topology. FEM[Ansys] simulation is conducted based on Quasi-3D method to perform electromagnetic and thermal analysis.
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Contents
Abstract i
Contents ii
...
Contents
Abstract i
Contents ii
List of table iv
List of figure iv
Nomenclature vi
Subscripts xi



I. Introduction 1
1.1 Preview of the thesis 1
1.2 Benefits from direct-drive concepts for a large scale wind turbine 3
1.3 The types of direct-drive PMSGs for wind turbine 5
1.4 Axial-flux permanent-magnet machines 7

II. Design of 2MW AFPM corresponding to Hyundai Rotem 2MW direct-drive RFPM Generators for Wind Turbine 12
2.1 Design procedures 12
2.2 Consideration of generator dimensions 15
2.3 2D modeling using FEM 26
2.4 Quasi-3D simulation for AFPM Generators 31
2.5 Design of an AFPM generator equivalent to 2MW Hyundai Rotem direct-drive RFPM generator 33

III. Electomagnetic Analysis 43
3.1 No load induced electromotive force 43
3.2 Inductance 47
3.3 Power factor and rated voltage 51
3.4 Cogging torque 52
3.5 Skewing effects 56
3.6 Losses 62

IV. Thermal analysis 66
4.1 Heat transfer 66
4.2 2D thermal analysis 71

V. Analysis of designed 2MW AFPM 74
5.1 Specification of designed AFPM 74
5.2 Comparison of volume between RFPM and AFPM 75
5.3 Comparison of mass between RFPM and AFPM 77
5.4 Comparison of cost between RFPM and AFPM 79
5.5 Comparison of efficiency between RFPM and AFPM 80

Ⅵ. Conclusion 83

Reference 85
Acknowledgments 89
Curriculum vitae 91