本論文的研究目標在於使用有限元素模擬軟體，修改高容量直接
驅動型風力用三相永磁發電機之定子鐵心厚度、定子與轉子間氣隙長度、磁石厚度、極間寬度以及定子槽深度等結構參數，以探討其對發電機效率之影響，並搭配田口法以達到提升三相永磁發電機整體運轉效率最佳化之目標。

在本論文中，亦將針對三相永磁發電機連接電阻性平衡及不平衡負載進行特性分析，評估在不同轉速下之電壓、電流、輸出功率、效率及諧波的影響，最後分析加入整流電路對發電機之特性影響等為研究項目。本論文之模擬結果，可利用於未來生產高品質、高效率、低鐵損特性之高容量直接驅動型風力用三相永磁發電機。

The aim of this thesis is to use simulation software based on finite-element method (FEM) to modify the stack length, the height of stator slot height, the width of stator tooth, the thickness of permanent magnet, and the air-gap length between the stator and rotor of a high-capacity direct-drive wind permanent-magnet generator (PMG) to achieve higher efficiency. The optimal efficiency of the studied PMG can also be evaluated using Taguchi method.

This thesis also studies the influence of different three-phase balance or unbalance resistive loads on the studied PMG, the influence of different rotational speeds on voltage, current, output power, efficiency, and harmonics of the studied PMG, and the influence of a rectifier circuit on the studied PMG. In the future, these important analyzed parameters and simulation results can be utilized to manufacture a high-capacity direct-drive wind three-phase PMG with higher power quality, lower core loss, and higher efficiency.

[1] H. Polinder, F. F. A. Van der Pijl, G. J. de Vilder, and P. J. Tavner,
“Comparison of direct-drive and geared generator concepts for wind
turbines,” IEEE Transactions on Energy Conversion, vol. 21, no. 3,
September 2006, pp. 725-733.
[2] C. N. Ashtiani and J. Vaidya, “Design evaluation of a high-speed
permanent magnet generator for load performance by finite
elements,” IEEE Transactions on Magnetics, vol. 22, no. 2,
September 1986, pp. 825-827.
[3] E. Spooner and A. C. Williamson, “Direct coupled, permanent
magnet generators for wind turbine applications,” IEE Proceeding
on Electric Power Applications, vol. 143, no. 1, January 1996, pp.
1-8.
[4] T. F. Chan and L. T. Yan, “Analysis and performance of a
surface-mounted NdFeB permanent-magnet AC generator,” IET
Advances in Power Systems Control, Operation and Management
Conference, vol. 2, November 1997, pp. 718-722.
[5] E. Muljadi, C. P. Butterfield, and Y. H. Wan, “Axial flux, modular,
permanent-magnet generator with a toroidal winding for wind
turbine applications,” IEEE Industry Applications Conference, vol.
1, no. 1, May 1998, pp. 174-178.
[6] E. Muljadi, C. P. Butterfield, and Y. H. Wan, “Axial-flux modular
permanent-magnet generator with a toroidal winding for
wind-turbine applications,” IEEE Transactions on Industry
Applications, vol. 35, no. 2, July-August 1999, pp. 831-836.
[7] J. Rizk and M. Nagrial, “Design of permanent-magnet generators
for wind turbines,” IEEE Power Electronics and Motion Control
Conference, vol. 1, no. 2, March 2000, pp. 208-212.
136
[8] J. Chen, C. V. Nayar, and L. Xu, “Design and finite-element
analysis of an outer-rotor permanent-magnet generator for directly
coupled wind turbines,” IEEE Transactions on Magnetics, vol. 36,
no. 2, September 2000, pp. 3082-3089.
[9] W. Wu, V. S. Ramsden, T. Crawford, and G. Hill, “A low speed,
high-torque, direct-drive permanent magnet generator for wind
turbines,” IEEE Industry Applications Conference, vol. 1, no. 1,
October 2000, pp. 147-154.
[10] G. Tsekouras, S. Kiartzis, A. G. Kladas, and J. A. Tegopoulos,
“Neural network approach compared to sensitivity analysis based on
finite element technique for optimization of permanent magnet
generators,” IEEE Transactions on Magnetics, vol. 37, no. 3,
September 2001, pp. 3618-3621.
[11] M. V. Ferreira da Luz, P. Dular, N. Sadowski, C. Geuzaine, and J. P.
A. Bastos, “Analysis of a permanent magnet generator with dual
formulations using periodicity conditions and moving band,” IEEE
Transactions on Magnetics, vol. 38, no. 2, March 2002, pp.
961-964.
[12] A. J. Mitcham and J. J. A. Cullen, “Permanent magnet generator
options for the more electric aircraft,” IET Power Electronics,
Machines and Drives Conference, June 2002, pp. 241-245.
[13] T. F. Chan, L. T. Yan, and L. L. Lai, “Performance of a
permanent-magnet A.C. generator with rotor inverse saliency,”
IEEE Electrical Machines and Systems Conference, vol. 1, no. 1,
November 2003, pp. 45-48.
[14] P. H. Mellor, S. G. Burrow, T. Sawata, and M. Holme, “A
wide-speed-range hybrid variable-reluctance/permanent-magnet
generator for future embedded aircraft generation systems,” IEEE
Transactions on Industry Applications, vol. 41, no. 1, March-April
2005, pp. 551-556.
137
[15] K. C. Kim, S. B. Lim, K. B. Jang, S. G. Lee, J. Lee, Y. G. Son, Y. K.
Yeo, and S. H. Baek, “Analysis on the direct-driven high power
permanent magnet generator for wind turbine,” IEEE Electrical
Machines and Systems Conference, no. 1, September 2005, pp.
234-237.
[16] Y. H. Chen, P. Pillay, and A. Khan, “PM wind generator topologies,”
IEEE Transactions on Industry Applications, vol. 41, no. 6,
November-December 2005, pp. 1619-1626.
[17] T. F. Chan and L. L. Lai, “An Axial-flux permanent-magnet
synchronous generator for a direct-coupled wind-turbine system,”
IEEE Transactions on Energy Conversion, vol. 22, no. 1, March
2007, pp. 86-94.
[18] H. Polinder, D. Bang, R. P. J. O. M. van Rooij, A. S. McDonald, and
M. A. Mueller, “10 MW wind turbine direct-drive generator design
with pitch or active speed stall control,” IEEE Electric Machines
and Drives Conference, vol. 2, May 2007, pp. 1390-1395.
[19] H. Li and Z. A. Chen, “Design optimization and comparison of large
direct-drive permanent magnet wind generator systems,” IEEE
Electric Machines and Systems Conference, October 2007, pp.
685-690.
[20] S. G. Burrow, P. H. Mellor, P. H. Churn, T. H. Sawata, and M. H.
Holme, “Sensorless operation of a permanent-magnet generator for
aircraft,” IEEE Transactions on Industry Applications, vol. 44, no. 1,
January-February 2008, pp. 101-107.
[21] S. H. Park, Robust Design and Analysis for Quality Engineering,
Chapman & Hall, 1996.
[22] CEDRAT, FLUX2D Version 7.40 User’s Guide, June 1999
[23] 唐任远，現在永磁電機理論與設計，機械工業出版社，1997。
[24] 吳梅豪，表面型永磁無刷馬達之設計，逢甲大學電機工程學系
碩士論文，民國九五年七月。
138
[25] 蔡宗翰，風力用永磁發電機之特性分析，國立成功大學電機工
程學系碩士論文，民國九十六年六月。