Abstract
A prototype wind turbine generator was designed on the concept that even small wind turbine generators need a variable pitch control system and low speed type blades especially to set on the roof of individual houses. The prototype machine is a 2.5kW rated power, 4m diameter, horizontal, upwind, free yaw and having three variable pitch blades wind turbine. Three blades are designed with thin airfoil and tip speed ratio of three. To make lighter blades, the blade shape has been improved, i.e., shortening the cut-off side chord lengths. The prototype wind turbine set on the roof floor of the engineering faculty building and has been applied two control methods of the variable pitch angle and regulating the field current of generator. This paper describes characteristics of thin airfoil blade calculated by the blade element and momentum theory and performances of the machine such as rotational speed, generator outputs as well as its stability for wind speed changes. In a pre-test under the average wind speed 6.0m/s, the wind turbine showed the average generator outputs of 194W, average rotational speed 56rpm, power coefficient 0.12.
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