2 ENERCON wind energy converter concept
ENERCON wind energy converters are characterised by the following features:
Gearless
The E-82 E4 drive system comprises very few rotating components. The rotor hub and the rotor of
the annular generator are directly interconnected to form one solid unit. This reduces the mechani‐
cal strain and increases technical service life. Maintenance and service costs are reduced (fewer
wearing parts, no gear oil change, etc.) and operating expenses also decrease. Since there are no
gears or other fast rotating parts, the energy loss between generator and rotor as well as noise
emissions are considerably reduced.
Active pitch control
Each of the three rotor blades is equipped with a pitch unit. Each pitch unit consists of an electrical
drive, a control system, and a dedicated emergency power supply. The pitch units limit the rotor
speed and the amount of power extracted from the wind. In this way, the maximum output of the
E-82 E4 can be accurately limited to nominal power, even at short notice. By pitching the rotor
blades into the feathered position, the rotor is stopped without any strain on the drive train caused
by the application of a mechanical brake.
Indirect grid connection
The power produced by the annular generator is fed into the distribution or transport grid via the
ENERCON Grid Management System. The ENERCON Grid Management System, which consists
of a rectifier, a DC link and a modular inverter system, ensures maximum energy yield with excel‐
lent power quality. The electrical properties of the annular generator are therefore irrelevant to the
behaviour of the wind energy converter in the distribution or transport grid. Rotational speed, exci‐
tation, output voltage and output frequency of the annular generator may vary depending on the
wind speed. In this way, the energy contained in the wind can be optimally exploited even in the
partial load range.
ENERCON wind energy converter concept
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