The present disclosure relates to armature assemblies for assembling a permanent magnet electrical machine and to methods for assembling a permanent magnet electrical machine. An armature assembly comprises an armature with a plurality of coils. The armature assembly further comprises a power source and a control system configured to selectively feed the plurality of coils when one of a field comprising one or more permanent magnets and the armature approaches the other of the field and the armature during an assembly of a permanent magnet electrical machine. A permanent magnet electrical machine may be a permanent magnet generator for a wind turbine, and in particular for a direct-drive wind turbine.

A wind power installation rotary connection, in particular a blade bearing or azimuth rotary connection, wherein the rotary connection is in the form of a plain bearing assembly, comprising an inner ring having a number of first plain bearing surfaces, an outer ring having a number of second plain bearing surfaces which are respectively associated with one of the first plain bearing surfaces as a plain bearing surface partner, and wherein the plain bearing assembly is in the form of a dry-running plain bearing assembly.

A jointed wind turbine rotor blade includes a first blade segment and a second blade segment extending in opposite directions from a chord-wise joint line. Each of the first and second blade segments includes opposite spar caps. The first and second blade segments are connected at the chord-wise joint line by internal joint structure, wherein the joint structure is bonded to the opposite spar caps in at least the second blade segment. The spar caps in the second blade segment have a first section with a first chord-wise width that is unbonded to the joint structure and a second section with a second chord-wise width that is bonded to the joint structure. The second chord-wise width is greater than the first chord-wise width.

A windmill blade includes a leading edge protector at a leading edge portion of a blade main body including a skin surrounding a hollow space. The leading edge protector is fixed to the skin from the hollow space.

Disclosed is a method for sealing a joint between a first blade section and a second blade section of a wind turbine blade, a sealing member and a wind turbine blade comprising a sealing member. The sealing member having a first surface and a second surface. The sealing member having a width between a first edge and a second edge. The sealing member being configured for attachment to the first outer shell along the first edge, and for attachment to the second outer shell along the second edge. The sealing member comprising a corrugated section between the first edge and the second edge, the corrugated section comprising one or more valleys and/or ridges extending along a lengthwise direction of the sealing member.

Provided is a wind turbine rotor blade with a longitudinal direction, at least one first rotor blade section with a first front side and one second rotor blade section with a second front side and a separation point between the first and second rotor blade sections. The first and second front sides abut against each other at the separation point. The first front side has a plurality of first recesses, and the second front side has a plurality of second recesses. Further provided is a fastening unit, which is designed to fasten the first and second rotor blade sections to each other at the separation point. The fastening unit has a plurality of first inserts made out of metal, which are arranged in the first recesses, and a plurality of second inserts made out of metal, which are arranged in the second recesses. The first inserts each have a first end and a second end. The second inserts each have a first end and a second end. The first ends of the first and second inserts are each arranged at the separation point. The fastening unit has a plurality of clamping units, which are suitable for bracing the first and second inserts against each other, wherein the respective first ends of the first and second inserts abut against each another and are braced against each other in the braced state.

The disclosure concerns a segmented wind turbine rotor blade, which is formed by at least two rotor blade segments, wherein at a division area of the wind turbine rotor blade the segments are firmly connected together at respective connection ends via a plurality of connecting elements, wherein a gap is formed between the connection ends, and a fairing is attached to the segments at the division area, the fairing covering the gap and the connecting elements; wherein the fairing is divided into at least two separate fairing sections, the fairing sections are coupled together at coupling regions at the pressure side and/or at the suction side of the rotor blade, and the coupling regions are spaced apart from the trailing edge or leading edge. The disclosure also concerns a method.

Disclosed is a wind turbine blade comprising a shell body, a down conductor arranged in the shell body for conducting lightning current to ground, an electrical connector arranged in electrical connection with the down conductor, a lightning receptor element arranged at a surface of the shell body or outside the shell body, the lightning receptor element being in electrical connection with the electrical connector. A method for manufacturing a wind turbine blade with a lightning protection system is also provided.

A marine current turbine rotor comprises a hub and fixed and two or more pitchable blade sections configured to reduce bending moment loads on the pitch bearings and enable the use of non-standard, low-cost structural materials for the hub, blades, and pitch shaft. A submersible pitch drive mechanism or linkage in the hub rotates the pitch shaft to cause the pitchable blade section to move to a specified pitch position. The hub cavity is configured to be “wet” without the expense and maintenance requirement of seals to prevent water intrusion, utilizing water-lubricated pitch bearings.

A rotor blade for a wind turbine, to a rotor for a wind turbine, to a wind turbine, to a method for producing a rotor blade, to a method for connecting a rotor blade to a rotor hub and to a method for repairing a rotor of a wind turbine. The rotor blade has a connection interface, the connection interface having at least one cutout for receiving a tension element for connecting the rotor blade to a further element of a wind turbine, an outer circumferential surface of the cutout being formed of a connection material and having an internal thread.