| Summary: | 碩士 === 國立聯合大學 === 機械工程學系碩士班 === 103 === In this study we designed and built a small wind turbine driven triboelectric micro-generator and the relationships between the output voltage of the generator and control parameters were investigated. Triboelectric micro-generator is a new type of generator. Its construction is very simple and size is small compared with traditional generator. Some researchers make micro structure on the surface of the friction pad to enhance the power of the triboelectric micro-generator. Hence, triboelectric micro-generator sometimes is called nano-generator. This new generator generates electric power by triboelectrification and electrostatic induction reactions. In this study, we designed a new triboelectric micro-generator which comprises a small wind turbine and an aluminum ring electrode. Two polymer friction pads of dimensions W7.5mm x L50-65mm were mounded on the shroud of the turbine blades. The friction pad slid on the inner surface of an aluminum ring electrode, when the wind turbine rotated. The result shows the output voltage of the generator increases linearly with wind speed as the wind speed less than 9 m/s and may decay as the speed higher than 9 m/s. Three types of the geometry of metal ring electrode were tested under an external load of 22MΩ, and the results shows that the output voltage of a continuous metal ring electrode is less than that of a continuous metal ring electrodes with two insulting segments. The discontinuous metal ring electrode can generate the highest output voltage. The output voltage of the generator also varies with the length ratio of friction pad and metal electrode. The output voltage can achieve the highest value as the length ration is unity. The generator equipped with PTFE pads generated output voltage 1.5-1.7 times of that of generator with PDMS pads, under the same test condition. The generator with PDMS pads on the best condition can give 3.7 Vrms, 1.0 mA/m2 and the generator with PTFE pads can give 6.2 Vrms, 1.62 mA/m2. A PDMS film was spin coated on an AAO film (the average pore size is around 280 nm) to make friction pads with micro structure. However, the tested results of the pads with micro structure were the same as that of the pads without the structure.
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