The invention provides a wind turbine including a nacelle, a rotor having at least one blade attached to a hub, and an electrical supply structure for supplying electrical power from the nacelle to the rotor. The rotor is rotatably connected to the nacelle about an axis of rotation. The supply structure comprises a switch which has a connected mode in which the nacelle and the rotor are electrically connected, and a disconnected mode in which the nacelle and the rotor are electrically disconnected. Furthermore, the switch is adapted to change from the disconnected mode to the connected mode when the rotor does not rotate.

A power supply apparatus for a field winding motor. A brush is disposed is a holder. An armature is connected to the brush and disposed in the holder. A slip ring is electrically connected to or disconnected from the brush. A support spring surrounds the brush between the slip ring and the armature. A coil is disposed outside of the holder so as to overlap the support spring and the armature. A first power terminal is connected to the brush and supplies a first driving current. A second power terminal is connected to the coil and supplying a second driving current.

A power supply apparatus for a field winding motor. A brush is disposed is a holder. An armature is connected to the brush and disposed in the holder. A slip ring is electrically connected to or disconnected from the brush. A support spring surrounds the brush between the slip ring and the armature. A coil is disposed outside of the holder so as to overlap the support spring and the armature. A first power terminal is connected to the brush and supplies a first driving current. A second power terminal is connected to the coil and supplying a second driving current.

Devices and methods of use for brush holder assemblies are disclosed. Brush holder assemblies including a mounting block and a brush holder are disclosed. Also illustrated is a brush holder assembly including a first portion in sliding engagement with a second portion. In some embodiments the brush holder includes a channel, such that at least a portion of the mounting block is disposed within the channel of the brush holder.

The present disclosure relates to brushes to transfer electric direct current from a current source to a rotor of an electric machine to electrically excite the rotor. It is an object of the disclosure to reduce the wear of brushes in electric machines. To this end a brush lifter for an electric machine with a spring to exert a pressure to a brush in the direction of a rotor is disclosed. The brush lifter has an inflatable gas bag fed via a feed with gas by a compressor, which is controlled by a processor, to lift off or drop the brush from the rotor via a hanger, wherein the brush is lifted when the gas bag is inflated and exerts a force to lift the hanger and the connected brush.

Devices and methods of use for brush holder assemblies are disclosed. Brush holder assemblies including a mounting block and a brush holder are disclosed. Also illustrated is a brush holder assembly including a first portion in sliding engagement with a second portion. In some embodiments the brush holder includes a channel, such that at least a portion of the mounting block is disposed within the channel of the brush holder.

Devices and methods of use for brush holder assemblies are disclosed. Brush holder assemblies including a mounting block and a brush holder are disclosed. Also illustrated is a brush holder assembly including a first portion in sliding engagement with a second portion. In some embodiments the brush holder includes a channel, such that at least a portion of the mounting block is disposed within the channel of the brush holder.

Provided is an apparatus for treating a substrate including: a processing vessel having a processing space; a support unit for supporting the substrate in the processing space and rotating the substrate; a liquid supply unit for supplying a processing liquid to the substrate; and a heating unit for heating the substrate, wherein the support unit includes: a spin chuck; a rotation driver for rotating the spin chuck; a chuck pin installed on the spin chuck to be rotated with the spin chuck; a chuck pin moving unit for moving the chuck pin between a contact position wherein the chuck pin is in contact with a side portion of the substrate and an open position at which the chuck pin is spaced apart from the side portion of the substrate, and the chuck pin moving unit moves the chuck pin while the substrate is rotated by the spin chuck.