Development of a Butterfly Wind Turbine with Mechanical Over-Speed Control System
| Autor: | Kenji Makino, Takeshi Ono, Susumu Sasaki, Shigeo Yoshida, Keisuke Shioya, Kengo Nojima, Kazuo Takashima, Yutaka Hara, Yousuke Tanaka, Shigenori Saito, Takakazu Hirobayashi, Kazutoshi Toba, Kotaro Tagawa |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Physics
Centrifugal force Vertical axis wind turbine Rotor (electric) 020209 energy Mechanical Engineering wind-power generation vertical axis wind turbine over-speed control system renewable energy cost reduction small-size wind turbine dryland Mechanical engineering 02 engineering and technology 021001 nanoscience & nanotechnology Turbine Industrial and Manufacturing Engineering Wind speed law.invention Mechanical system Electricity generation law 0202 electrical engineering electronic engineering information engineering 0210 nano-technology Engineering (miscellaneous) Induction motor |
| Zdroj: | Designs; Volume 2; Issue 2; Pages: 17 |
| ISSN: | 2411-9660 |
| DOI: | 10.3390/designs2020017 |
| Popis: | Based on a concept of “cost reduction by large rotor and small generator”, a kind of small vertical axis wind turbine (VAWT) called a butterfly wind turbine (BWT) has been developed with rotor diameter of 7 m and five looped blades. One of the features is a mechanical system which can twist each blade of a VAWT by using the centrifugal force acting on the blades in order to prevent over-speeding of the rotor. An electric power generation system that combines the BWT utilizing the over-speed control system (OCS) with a coreless generator connected to a three-time increasing gear unit is constructed in this study. The performance of the BWT power-generation system is predicted by the blade element momentum (BEM) theory. The final goal of this research is to show the feasibility of the low-cost VAWT power generation system with the proposed OCS. From the results of a series of forcible rotation experiments of the BWT rotor that is driven by an induction motor in very low wind speed condition, it is shown that the twist movement of the blades is improved by the design of the OCS that considers the observed radial force deprived of the centrifugal force and the pre-compression of springs. In the generation experiments with the final design of the OCS, the expected twists of the blades are observed for the first time in strong natural wind speed over 18 m/s. |
| Databáze: | OpenAIRE |
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