A method of servicing a wind turbine component of a wind turbine is provided. The wind turbine component is a main component (120) that comprises a first subcomponent (10) and one or more second subcomponents (20), wherein the first subcomponent (10) comprises a subcomponent memory (11) storing component information. The component information comprises information that is specific to the main component (120) of the wind turbine (100). The method comprises reading out at least a portion of the subcomponent memory (11) of a malfunctioning first subcomponent (10) of the main component (120) to obtain the component information of the malfunctioning first subcomponent (10) and writing at least a part of the component information to a subcomponent memory (31) of a replacement subcomponent (30) provided for replacing the malfunctioning first subcomponent (10). The component information is written over a communication link established to the replacement subcomponent (30).

Stators for use in electric machines and methods for refurbishing the same. One method for refurbishing a stator for use in an electric machine includes at least partially disassembling the stator to provide access to a plurality of stator windings connected in a four-circuit star connection having three turns per coil, and reconfiguring the stator such that the plurality of stator windings are connected in a four-circuit delta connection having five turns per coil.

Stators for use in electric machines and methods for refurbishing the same. One method for refurbishing a stator for use in an electric machine includes at least partially disassembling the stator to provide access to a plurality of stator windings connected in a four-circuit star connection having three turns per coil, and reconfiguring the stator such that the plurality of stator windings are connected in a four-circuit delta connection having five turns per coil.

Stators for use in electric machines and methods for refurbishing the same. One method for refurbishing a stator for use in an electric machine includes at least partially disassembling the stator to provide access to a plurality of stator windings connected in a four-circuit star connection having three turns per coil, and reconfiguring the stator such that the plurality of stator windings are connected in a four-circuit delta connection having five turns per coil.

A repair device is provided for a wind turbine having a bearing with damaged teeth driven by a motor. The repair device includes a carrier for connection to the bearing and radially aligned with the damaged teeth. A gear train is mounted on the carrier for creating a torque transfer path from the motor to non-damaged teeth of the bearing.

A tool for lifting a main shaft of a wind turbine has a rail having a first end and a second end, the rail configured to be fixedly mounted proximate the first end of the rail to the main shaft proximate a rotor hub mounting end of the main shaft. A counterweight is movably mounted on the rail to permit moving the counterweight longitudinally along the rail. A lug is fixedly mounted on the rail proximate the first end of the rail, the lug configured to be securable to a lifting device so that the rail can be suspended from the lifting device. Use of a counterweighted lifting tool such as the one described above permits mounting and dismounting the main shaft underneath a nacelle-mounted lift system.

A detection unit acquires detection data of a wind turbine generator. A controller generates abnormality information indicating an abnormality or an abnormality sign in the wind turbine generator based on the detection data. The controller transmits the abnormality information to a user terminal.

A method of monitoring the condition of a fluid-film bearing arranged to support the generator of a direct-drive wind turbine is provided. The method allows providing a hydrophone configured to convert acoustic noise to an output signal; immersing the hydrophone in the lubricating fluid of the fluid-film bearing; providing access to the hydrophone output signal at the exterior of the fluid-film bearing; and evaluating the hydrophone output signal to determine the condition of the fluid-film bearing. Disclosed embodiments further include a condition monitoring arrangement of a fluid-film bearing; and a direct-drive wind turbine comprising a fluid-film bearing and the condition monitoring arrangement.

A wind turbine drivetrain is provided, including a low-speed shaft; a high-speed assembly including a planetary gearbox and a generator; a coupling assembly including a first annular part connected to the low-speed shaft, a second annular part connected to a first stage of the planetary gearbox, and a cylindrical intermediate part extending between the annular parts, a drivetrain housing arranged to enclose the low-speed shaft and the coupling assembly; having an outer access opening formed in the drivetrain housing; and an inner access opening formed in the intermediate part of the coupling assembly and arranged to align with the outer access opening to facilitate access to the interior of the coupling assembly. Also, further described is a method of performing a maintenance procedure on such a wind turbine drivetrain.