| 摘要 |
Wind power plants or wind turbines usually consist of a tower, at the upper end of which a rotor and a generator which is connected to the latter are arranged. In the case of electrical power outputs in the multi-megawatt range, the weight of the rotor and the generator becomes very high and lies in the range of up to 800 tonnes. Said high weight at the upper end of the tower of course requires correspondingly mechanical stability of the tower, which substantially increases the construction costs of the wind power plant. In order to avoid the high weight and the associated massive design of the tower, it is known to arrange only the rotor at the upper end of the tower and to arrange the generator in the bottom region of the tower. The rotor shaft at the upper end of the tower is connected to the generator shaft via a traction mechanism drive. Since the tower has to absorb only the weight of the rotor and the wind loads, the result for the tower is a simpler and/or less massive construction and lower costs as a result. The power which can be transmitted by way of traction mechanism drives is proportional to the circulating speed of the traction mechanism drive and proportional to the power which acts on the traction mechanism. In the case of a low circulating speed, the traction mechanisms have to be designed for extremely high power levels which can lead to destruction of the traction mechanism in the case of a fault. If the circulating speed becomes too high, there is the risk that the oscillations of the traction mechanism can no longer be managed. By virtue of the fact that a gear mechanism is provided between the rotor and the upper shaft wheel, the circulating speed can be set and optimized in such a way that high power outputs in the megawatt range are transmitted by the traction mechanism drive, and the circulating speed of the traction mechanism and the forces which act on the traction mechanism lie within technically manageable intervals. |
