風機之可靠度、性能及安全性，一直是大家所關心之課題，本文之目的在於建立一套小型風機葉片及發電機之設計流程，將風機之葉片與發電機系統之設計理論，分別為葉片元素理論與佛萊明右手定則，分別撰寫出人機介面設計與分析軟體，將設計好之幾何參數輸入所開發之人機介面軟件，便可觀察風機系統靜態之性能曲線，再透過統御方程式搭配MATLAB裡的Simulink仿真功能，建立風機系統之動態模型，透過此動態系統，可真實模擬風機實際發電之動態，便可以在短時間內快速得到系統是否優劣及穩定，因此靜態系統在設計端就可以計算出系統是否崩壞，便可進行適度修改設計，避免長時間模擬分析及修改，而動態系統更可以模擬長時間戶外運轉之目的，藉此達到縮短風機開發之時程。
而為了可以在高風速下穩定發電，及提高安全性，另一研究重點為被動式節距控制系統之開發，搭配普利盤高速旋轉之特性，結合直線軸承、滾珠軸承、凸輪軸承之創新機構設計，來達到風機系統在高風速、高轉速下，風機葉片可以轉向之目的，進而降低轉速，穩定發電，而當風速下降時，再藉由彈簧回復功能，使葉片回至初始原點，整個循環的動作，不透過任何電力驅動，此為本文所開發之被動式節距控制系統。

This paper presents an integrated static and dynamic model to predict the performance of small horizontal axis wind turbine (HAWT), using theories of the blade element momentum theory (BEMT), Fleming’s right-hand rule and the relation of torque output. A theoretical study on the performance of a HAWT is presented. This research aims to establish a reliable assessment platform for the small HAWT, upon which the design and dynamic analysis for its turbine blades and axial-flux permanent magnet (AFPM) generator can be expediently carried out. The predicted results were verified by experiments undertaken in a wind tunnel as well as in outdoor environment. By adopting the model without involving any time-consuming computer simulations, various performance curves were obtained for different designs. Graphical user interface (GUI) software and simulink in MATLAB implementing the proposed model has been developed to facilitate the performance assessment of the complete HAWT system. As a powerful and expedient tool, the development process enables engineers to effortlessly make appropriate designs for a wind turbine system and to quickly correct any design changes when necessary.
Another research is to design a mechanism of passive pitch control to acquire stable power at high wind speed for small HAWT. The mechanism uses a disk-pulley as an actuator to control the blade pitch-angle such that the rotating speed may remain stable by centrifugal force yet without electric power. From the principal of aerodynamics, the rotations of wind turbines may slow down at high wind speeds due to the change of blade pitch-angle. As a marking advantage, this does not need brakes to avoid electrical burns-out and structural failure at high wind speeds. It can ensure the blades and generator to operate safely under most environments. In this paper, the analysis uses BEMT to develop graphical user interface software to facilitate the performance assessment of the complete passive pitch control (PPC) of small HAWT. For verifications, the PPC of small HAWT was tested in a full-scale wind tunnel for its aerodynamic performance. At low wind speeds, this system was tested to perform the same as the traditional one, yet at high wind speeds, this PPC system can effectively reduce the rotation speed to output stable power.

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