Enercon E40 – 500 kW

Enercon wind turbine company logoEnercon GmbH, based in Aurich, Lower Saxony, Germany, is the fourth-largest wind turbine manufacturer in the world and has been the market leader in Germany since the mid-nineties.

One of Enercon’s key innovations is the use of a gearless, direct drive mechanism, used in combination with an annular generator. This is in contrast to most other wind turbines, which use a gearbox in order to increase the rotation speed of the generator. Other differences in Enercon’s wind turbines are their distinctive drop-shaped generator housings (designed by Lord Norman Foster) and their towers, which are painted with green rings at the base to blend in with their surroundings.

At a particular location, the wind speed will vary about an annual mean value. The expected energy yields for the Enercon E40 at various annual wind speeds (AMWS) is shown below:

AMWS m/s
Annual KWh
Daily kWh
Gross Annual Revenue
4
300,000
822
£75,000
5
650,000
1781
£162,500
5.5
825,000
2260
£206,250
6
1010,000
2767
£252,500
6.5
1200,000
3287
£300,000
7
1400,000
3835
£350,000
7.5
1650,000
4520
£412,500
8
1775,000
4863
£443,750
8.5
1930,000
5287
£482,500
9
2100,000
5753
£525,000
9.5
2250,000
6164
£562,500

Model:

 ENERCON E-40

Rated capacity:

 500 kW

Rotor diameter:

 40 m

Hub height:

 46/65/78 m  (variety of towers and bases)

Converter concept:

 gearless, variable speed, variable blade pitch

Rotor with pitch control

 

Type:

 upwind rotor with active pitch control

Direction of rotation:

 clockwise

Number of blades:

 3

Swept area:

 1,276m2

Blade material:

 fiberglass (reinforced epoxy) with integral lightning 
  protection

Rotor speed:

 variable, 18 – 38/18 – 34 rpm

Tip speed:

 38 – 80/41 – 78 m/s

Pitch control:

 three synchronized blade pitch systems with
  emergency supply

Generator with drive train 

  

Hub: 

 rigid

Main bearings: 

 double-row tapered roller bearings

Generator:

 direct-driven ENERCON ring generator
  

Grid feeding:

 ENERCON inverter

Braking system:

 – 3 independent pitch control systems with
  emergency supply
  –  rotor brake
  –  rotor lock for service and maintenance
  

 Yaw control:

 active through adjustment gear load-dependent
  damping

 

  

 Cut-in wind speed:

 2,5 m/s

 Rated wind speed:

 12,5 m/s 

 Cut-out wind speed:

 28 – 34m/s

Weight:

Rotor – 2,700 kgs
Nacelle (without rotor) – 23,200 kgs
towers from 35,000 – 61,500 kgs.

 Remote monitoring system:

 ENERCON SCADA

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