The rotational speed of the vertical shaft wind-driven generator is monitored after the starting of the vertical shaft wind-driven generator.

In the case of a prior art windmill, in response to an alarm signal generated due to an external factor, a shutdown sequence is started which shows a series of operations ranging from the start of windmill feathering to the stop of the windmill.

It also requires that there be some remanence in the rotor iron, i.e. some leftover magnetism when you start the turbine.

The rotational speed of the vertical shaft wind-driven generator is monitored after the starting of the vertical shaft wind-driven generator.

Electrical power is generated by the wind turbine or the wind farm once a first wind velocity (start wind) is reached.

In the case of a prior art windmill, in response to an alarm signal generated due to an external factor, a shutdown sequence is started which shows a series of operations ranging from the start of windmill feathering to the stop of the windmill.

The auxiliary wind mill is disposed proximately to the main wind mill but not touching it.

Rotational direction of the auxiliary wind mill is reverse to that of the main wind mill.

A rotor of the wind turbine is directly connected with a rotatable drive train of the wind turbine.

The Savonius windmill, the paddle windmill, the autorotation blade type windmill and so on can generate the power even with a weak wind.

The stopping mechanism reduces the maintenance ratio of the fan, decreases the use cost of the fan, and improves the profit.

A rotor of the wind turbine is directly connected with a rotating drive train of the wind turbine, the rotating drive train is directly connected with a rotor of a electrical generator (7) of the wind turbine.

Moreover, light grid structures can be used for the tower, and constructing the wind turbine thus becomes more cost-effective.

The unique design of an open cover on the top (10A) of the wind turbine allows wind from the direction above the turbine to be harnessed.

The cap and the blades of the wind turbine are thereby hoisted to the top of the wind turbine tower once this has been erected.