OFFERING MEMORANDUM Global Offering of up to ... - Nordex

turbine. When the power output is too high, the controller sends a
command to the blade pitch mechanism which immediately pitches
(turns) the d rotor blades slightly d out of the wind. Conversely,
the blades are turned back into the wind whenever the wind drops
again. It must therefore be possible to turn the rotor blades around
their longitudinal axis. On a pitch-regulated wind turbine, the
controller will pitch the blades every time the wind changes; this
ensures that the rotor blades are always at the optimum angle in
order to maximise output. Due to the complex technology involved,
pitch-regulated turbines require greater investment than stall
technology.
‘‘Plug and play’’ assembly IT term meaning the assembly of a device or machine from
components without the need for engineering.
Power curve A turbine’s power curve shows the relationship between electric
power output and wind speed.
Power regulation Principles which govern the operation of a wind turbine, e.g.
defining the cut-in speed, the speed at which electricity is
produced or the speed at which it is turned out of the wind.
Renewable energy sources see d alternative energy sources
Retail fund A standardized form of asset management by an investment
company. In contrast to individual portfolio management, the
investor has no influence on management and investment
strategy. The corporation is only bound to observe legal
regulations and its self-imposed investment guidelines.
Rotation range The difference, given as a percentage, between the cut-out speed
and the cut-in speed.
Rotor area The area swept out by the rotor during operation. The larger the
rotor diameter, the greater the swept area and therefore the
output.
Rotor blades The rotating wings of a turbine which are driven directly by the
wind.
Rotor hub The part of the wind turbine to which the rotating rotor blades are
attached. The hub is situated in the middle of the rotor and
connects this to the generator armature via the shaft and in some
cases a gear.
Rotor shaft A machine component which transmits the rotor’s motion to a gear
or to the generator armature.
Shaft A machine component which transmits the rotor’s motion to a
fixed gear, which is in turn connected to the generator armature.
Also called rotor shaft.
Stalling A physical situation which stops the rotor’s motion. Stalling occurs
when the angle of the rotor blade to the directions of the wind is
too acute. The lift force on the rotor increases with the angle of the
blade to the direction of the wind up to a certain point, at which
turbulence occurs on the surface facing away from the wind. This
turbulence causes the rotor to slow or stop.
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