本文旨在設計及製作可攜式垂直軸式微型風力發電系統。可將無鐵心三相永磁式同步發電機所產生之變動電壓及頻率的交流電源，由三相全橋二極體整流為直流電源。在風車方面採用波浪型葉片混合桶型轉子形狀，以提高風能發電效率。在蓄電池的充電方面採用返馳式轉換器以電流模式脈波寬度調變控制，並藉由回授電壓訊號來完成直流輸出電壓閉迴路控制。本文之發光二極體的調光驅動電路使用脈波寬度調變控制，以輸出一穩定的電流供LED調光用。本文已完成風力發電機輸出功率8W，經功率轉換器輸出額定電壓為12V，效率為87% 的可攜式微型風力發電系統之雛型，實測結果驗證系統設計之可行性。

A portable micro-scale vertical-axis wind power generation system has been designed and built. Power conversion system is applied to transfer the alternating current with varying voltage and frequency generated from the iron coreless three-phase permanent-magnet synchronous generator via three-phase full-bridge diode rectify to direct current. In the windmill, the efficiency of wind generator has been increased by adopting wavy blade and shaped-savonius. Battery recharging is conducted by using flyback converter with current-mode pulse-width-modulation (PWM) control. The direct current output voltage closed-loop control is completed through voltage feedback signals. Finally, PWM technique is used to provide stable current for LED with dimming. A prototype of the portable micro-scale wind power system has been accomplished. The output power is 8W, the rated voltage output from power converter is 12V and the efficiency is 87%. The feasibility of the system has been verified by the result of experiment.

[1] 德商英華威公司網頁，http://www.infra-vest.com。
[2] 牛山 泉著，李漢庭譯，圖解風力發電入門，世茂出版有限公司，2010。
[3] R. R. Wallace, T. A. Lipo, L. A. Moran and J. A. Tapia, “Design and construction of a permanent magnet axial flux synchronous generator,” IEEE International Electric Machines and Drive Conference Record, pp. MA1/4.1-4.3, 1997.
[4] 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. 4, pp.831-836, 1999.
[5] J. R. Bumby and R. Martin, “Axial-flux permanent-magnet air-cored generator for small-scale wind turbines,” IEE Proceedings - Electric Power Applications, Vol.152, No.5, pp.1065-1075, 2005.
[6] E. Spooner, B. J. Chalmers and W. Wu, “An Axial Flux Permanent Magnet Generator for a Gearless Wind Energy System,” IEEE Transactions on Energy Conversion, Vol.14, No.2, pp.251-257, 1999.
[7] J. R. Bumby, N. Stannard, J. Dominy and N. McLeod, “A Permanent Magnet Generator for Small Scale Wind and Water Turbines,” ICEM 2008. International Conference on Electrical Machines, pp.1-6, 2008.
[8] T. Reed, E. Bakhoum, “Axial Flux Permanent Magnet Alternator using printed circuit board stators,” IEEE Southeastcon, pp.454-459, 2008.
[9] 林志賢，「返馳式電源轉換器之分析、模擬與製作」，逢甲大學資訊電機工程研究所碩士論文，民國九十九年。
[10] M. Ferdowsi, A. Emadi, “Pulse Regulation Control Technique for Flybacl Converter,” IEEE APEC’04, pp.1745-1750 Vol.3, 2004.
[11] R. K. Singh, A. Joshi, A. Ghosh, “A Modified Flyback DC-DC Converter Topology,” IEEE APEC’98, pp.337-343 Vol.1, 1998.
[12] W. A. Rodrigues, L. M. F. Morais, P. F. Donoso-Garcia, P. C. Cortuzo, S. I. Seleme, “Comparative Analysis of Power LEDs Dimming Methods,” IEEE Industrial Electronics Society, pp.2907-2912, 2011.
[13] P. Narra, D. S. Zinger, “An Effective LED Dimming Approach,” IEEE IAS’04, pp.1671-1676, 2004.
[14] 陳建信，「垂直軸式風力發電機系統設計有效擷取風能葉片研究」，明道管理學院材料暨系統工程研究所碩士論文，民國九十四年。
[15] 李聚儒，「小型垂直軸風機無鐵芯軸向磁通永磁發電機研究」，台灣大學工學院機械工程研究所碩士論文，民國九十八年。
[16] 牛山 泉、關 和市，垂直軸風車，臺大出版中心，民國一百年。
[17] 牛山 泉、三野 正洋，小型風車手冊(附•小型風車設計圖例)，臺大出版中心，2010。
[18] 張浚溢，「表面型與內藏型永磁同步機特性比較」，逢甲大學電機工程研究所碩士論文，民國九十一年。
[19] 李秉倫，「軸向磁通無刷永磁直流馬達最佳化設計」，逢甲大學電機工程研究所碩士論文，民國九十六年。
[20] J. F. Gieras, R. J. Wang, and M. J. Kamper, “Axial Flux Permanent Magnet Brushless Machines,” Kluwer Acadenic, 2004.
[21] N. Mohan, T. M. Undeland, W. P. Robbins, “Power Electronics: Converters, Application, and Design,” 3rd Edition, WILEY, 2003.
[22] M. Brown, “Power Supply Cookbook, Second Edition,” Newnes, 2001.
[23] R. W. Erickson, D. Maksimović, “Fundamentals of Power Electronics, Second Edition,” University of Colorado Boulder, Colorado, 2000.
[24] 梁適安，交換式電源供應器之理論與實務設計，全華科技圖書，2004。
[25] M. R. Secades, A. J. Calleja, J. Cardesin, J. Ribas, E. L. Corominas, J. M. Alonso, and J. Garcia, “Driver for high efficiency LED based on flyback stage with current mode control for emergency lighting system,” IEEE IAS’04, pp.1655-1659, 2004.
[26] I. H. Oh, “An Analysis of Current Accuracies in Peak and Hysteretic Current Controlled Power LED Drivers,” IEEE APEC’08, pp.572-577, 2008.
[27] N. Prathyusha and D. S. Zinger, “An Effective LED Dimming approach,” IEEE IAS’04, pp.1671-1676, 2004.
[28] Alwaytek, “AW1001 Data Sheet, High Power Constant Current Driver with High Power Supply Ripple Rejection,” Alwaytek Co., Ltd.