The method of erecting a wind turbine, comprising pivotably mounting the lower end of a mast on a side or end of a container, connecting a first wire, rope, cable, or chain to the upper end of the mast and to the top end of an intermediate truss, connecting a second wire, rope, cable, or chain to the top end of the intermediate truss and to a winch, pivotably fixing a lower end of the intermediate truss to the container, operating the winch to support a portion of the weight of the mast, assembly the wind turbine on the mast, operate the winch to move the mast and wind turbine to the vertical position, engage a second connection to fix the mast in the vertical position, and releasing the wire, rope cable or chain from the upper end of the truss.

An apparatus is for performing parts of an operation to install a wind turbine, wherein the wind turbine has a tower, wherein the apparatus has a travelling car for travelling up and down along the tower for the wind turbine, and wherein the travelling car has a movable portion of a deck of the travelling car, wherein the movable portion of the deck is configured to carry an item to be installed as part of the wind turbine to a height for installation of the item and for moving the item substantially horizontally into a position for installation of the item when the travelling car is in a vertical position for installation of said item. Further is disclosed a method of installing at least a part of a wind turbine.

A main shaft fixture for fixing a main shaft on a wind turbine during installation and repair work on heavy parts of the wind turbine nacelle, in the case where the fixture is formed of several sections for mounting on stable structural parts in the nacelle, including the nacelle's bottom frame. The main shaft fixture has adjustable pressure mandrels with tap shoes, which cause the fixture to be usable regardless of the turbine main shaft geometry, such that it can be mounted without fixing the rotor. The main shaft fixture also has facilities for mounting of a lightweight crane and a self-hoisting crane with a ground-based winch, respectively, as well as a rotor lock which, in combination with actuators of the main shaft fixture, enables the main shaft and the main shaft bearing to be sufficiently displaced vertically from its bearing in the nacelle to service or replace the bearing.

A nacelle-mounted multiple-appliance lift system has a first lifting appliance and a second lifting appliance mounted in a nacelle of a wind turbine. The first and second lifting appliances are each mounted on main bearing housing securements, gearbox pillow blocks, or both the main bearing housing securements and the gearbox pillow blocks. The first and second lifting appliances share one or both of the main bearing housing securements and the gearbox pillow blocks.

A nacelle for a wind turbine includes a nacelle roof and a first wind turbine component, wherein the nacelle roof is configured to cover the first wind turbine component, the nacelle roof including a first sliding section and a second sliding section, wherein the first sliding section and/or the second sliding section is configured to slide over at least a part of the surface of the nacelle roof, wherein the first sliding section and the second sliding section are moveable between a closed position, in which the first wind turbine component is covered by the nacelle roof, and an opened position, resulting in an opening of the nacelle roof through which the first wind turbine component is hoisted.

A wind turbine assembly includes a falling weight system to store potential energy within the wind turbine assembly. The falling weight system utilizes a pair of gears that can rotate to raise and lower weights within a cavity of the tower section. In addition, an assembly ring that is configured to climb a tower section of a wind turbine assembly may be used to assemble a wind turbine assembly or to perform maintenance on wind turbine assemblies. In some examples, a ballast weight system utilizing a ballast weight tank that lowers by being filled with water may be used to input rotational energy into a generator to create electricity.

A method for assembling a wind turbine (10) having a first wind turbine component (20) with a first mounting interface (36) and a second wind turbine component (26) with a second mounting interface (34) includes positioning the second wind turbine component (26) relative to the first wind turbine component (20) such that the second mounting interface (34) is located a vertical distance above the first mounting interface (36), aligning the second mounting interface (34) to the first mounting interface (36), lowering the second wind turbine component (36) toward the first wind turbine component (20) to contact each other, and connecting the second mounting interface (34) to the first mounting interface (36). At any time during assembly when the second mounting interface (34) vertically overlaps the first mounting interface (36), the vertical distance between second mounting interface (34) and the first mounting interface (36) is maintained below a predetermined threshold (D). A system for assembling the wind turbine (10) is also disclosed.

A method (100) of servicing or installing a component of a wind turbine (10) using a crane (50), the wind turbine (10) comprising a nacelle (16) and a rotor hub (20) coupled to the nacelle (16) and rotatable about a rotor axis, the method (100) comprising rotating the rotor hub (20) about the rotor axis to a first rotational position; lifting the crane (50) to the rotor hub (20) while the rotor hub (20) is positioned at the first rotational position; mounting the crane (50) to a mounting portion (21) of the rotor hub (20) while the rotor hub (20) is positioned at the first rotational position; and rotating the rotor hub (20) together with the crane (50) from the first rotational position to a second rotational position.

Described is a device for placing a component of a wind turbine on a wind turbine tower. The device includes a hoisting frame which is suspended from a hoisting hook of a hoisting means, and which is provided with take-up cables whereby the component is taken up in the hoisting frame. The hoisting frame is embodied such that in a first position of the hoisting frame relative to the hoisting hook the centre of gravity of the taken-up component and a centre of gravity of the hoisting frame are situated on either side of a vertical plane which runs through the hoisting hook and which does not comprise any of the centres of gravity. The invention likewise relates to a method which makes use of the invented device.

A climbing crane includes at least a vibration damping device configured for damping at least a first vibration frequency of the erected tower of a wind turbine when the climbing crane is coupled to the tower. Furthermore, a method for erecting a wind turbine with a climbing crane is also provided.