| 摘要 |
According to an aspect of the present invention, there is provided an apparatus and method for controlling the rotational speed of the vertical axis wind power generation system without the requirement of the mechanical brake mechanism in order to prevent the runaway condition. The vertical axis wind turbine comprises a mechanical means of spring governor preloaded with determined tension corresponding to the optimum rotational speed. The spring holds the airfoil blades firmly as long as the rotational speed falls within the determined level. The spring acts as actuator while the rotational speed crosses the optimum level by tuming the blade to a certain degree thereby varying the angle of attack of the airfoil blades. The rotational speed is then retarded and regulated within the prescribed level. |
