| 摘要 |
The invention relates a wind turbine comprising a rotor (12) provided with adjustable rotor blades (13) for driving a generator (14), an adjusting device (3) for the rotor blades (13) provided with an actuator (4) that comprises at least an excitation winding (41). Said adjusting device (3) comprises a torque-reducing device that automatically reduces drag torque of an actuator (4). According to the invention, the torque-reducing device comprises a current divider (8) that switches the current through the excitation winding (41) in such a manner that the current (IA) flows completely through said excitation coil (41) when the motor is in operation and the current (IA) only partly flows through said excitation coil when coasting. As a result, when coasting, the magnetisation of the excitation winding (41) is reduced about an adjustable part, whereby the increase of the speed torque characteristic curve can be determined, thus improving the ratio of the adjusting device when coasting. |
