HOME > Sail-wing-type Wind Power Generation Apparatus
Purpose of this proposal
It is said that vertical-shaft-type wind turbines are well suited to Japan, where wind velocity and direction change easily. However, large vertical-shaft-type wind power generators that can be used for wind power plants have not been developed yet. There are three reasons for this: One, lift-type systems break easily due to the centrifugal force caused when their blades rotate excessively in strong winds. Two, it is difficult for many of them to activate on their own. And three, drag-type systems have a low level of power generation efficiency. However, drag-type systems produce only a small decrease in the kinetic energy of wind, so many wind turbines can be built at the same site. For this reason, if it is structurally easy to build large drag-type systems and if such systems can be manufactured at a low cost, they are expected to lower power generation costs more than horizontal-shaft-type generators, because they can generate power even when winds are weak. Needless to say, what is important to wind power generation is the overall power generation cost rather than the power generation efficiency per system.
Therefore, we are proposing this sail-wing-type wind turbine. One strength of this turbine is that we do not need to worry about excessive rotation because it is a vertical-shaft, drag type generator. Some others are that it is easy to take countermeasures against lightning and that birds hit the wind turbines less frequently. Yet another is that the turbines emit less wind noise. Furthermore, these turbines can continue to operate even in a typhoon, and maintenance work can easily be performed from the ground.
Outline of Apparatus：
This sail-wing-type turbine consists basically of sails spread along a mast of a vessel and only rotates the mast, so that a large sail-wing-type turbine can be easily introduced in sailing ships. In a strong wind, lowering the sails can prevent the wind turbine from being damaged.
The pipe-shaped rotation shaft (13) is attached to the outside of the metal supporting post (12) vertically secured to the ground. On the outside of the rotation shaft (13), the rotary mounts (14) are suspended by the wire (26) running through the supporting post (12). Arms (15) extend horizontally from the rotary mounts (14). Jibs are set to the arms in such a way that, when one jib fills with wind, the jib on the other side flutters. The rotary mounts (14) are secured to and integrated with the rotation shaft (13) by the grooves (14a), so that the rotation shaft (13) rotates when the wind blows.
The lower end of the rotation shaft (13) serves as the shaft of the large-diameter gear (23). This rotating force can be used to run the generator (25) via a small-diameter gear (24) to generate electric power.
By operating the wire (26) with the winch (28), it is possible to move the rotary mounts (14) and arms (15) up and down along the grooves (14a), and thereby change the wind-receiving areas of the wind receiver jibs (16), depending on the wind strength.
The output of the wind turbine can be calculated by W = (1/2)ρAVC, where the parameters are given as follows:
ρ: Air density (1.3 kg/m);
A: Wind receiving area (50 m in height × 25 m in width);
C: Generating efficiency (15%);
V: Wind velocity (5 m/sec; average wind velocity on land).
Accordingly, W can be calculated as W ≒ 15 kW.
Since the sail-wing-type wind turbine generates 20 kW or less, it makes an annual profit of approximately 74.9 million yen at a purchasing price of 57 yen/kWh. This estimate shows that when the charges for usage of land and the maintenance costs of the vessel for five years are 50 million yen with the depreciable life of the wind turbine being five years, the apparatus will make profit at a construction cost of 324.5 million yen or less per unit.
Patent ： Japanese patent No.5235486
If you require more details, please contact us using the information below:
Makoto Yasukagawa, Director of Morito Senai Hospital
8-13 Hitokita-nishi, Moniwa, Taihaku Ward, Sendai City, Miyagi Prefecture