Iskra AT5-I

The blades of the AT5-I are specifically optimised for low wind speed operation. An exceptionally efficient profile for the blade aerofoil has been adopted and the blades are longer than is usual on a machine of this rating. Accurate manufacture is essential to reproduce the required blade shape and keep drag low.

Also, the passive pitch control allows the blades to be at the optimum angle for low wind speed, pitching the blades to prevent overload in high winds or at high rotor speeds.

For very high electrical efficiency, a 3- phase generator using rare earth permanent magnets has been specially designed for the turbine. The generator is designed to work at low rpm and so can be directly driven by the rotor. A gearbox is therefore not needed, thus eliminating a source of inefficiency, noise and potential maintenance problems.

Iskra AT5-I Data

Rated Output:

5kW

Rotor Speed:

200rpm nominal (variable)

Cut-in Wind Speed:

3m/s (6.7 mph)
Survival Wind Speed:

60m/s (134 mph)

Rotor Diameter:

5.4m

Number of Blades:

3

Blade Material:

GRP composite

Control System:

Passive blade pitching

Gearbox:

None

Brakes:

Electro-dynamic

Generator:

Permanent magnet alternator

Yaw Control:

Tail vane

Tower Height:

9m, 12m, & 15m

Tower:

Free-standing or guyed

 

Performance

Aerodynamic

The blades are specifically optimised for low wind speed operation. An exceptionally efficient profile for the blade aerofoil has been adopted and the blades are longer than is usual on a machine of this rating. Accurate manufacture is essential to reproduce the required blade shape and keep drag low. Also, the passive pitch control allows the blades to be at the optimum angle for low wind speed, pitching the blades to prevent overload in high winds or at high rotor speeds. Also, the passive pitch control allows the blades to be at the optimum angle for low wind speed, pitching the blades to prevent overload in high winds or at high rotor speeds.

Electrical
For very high electrical efficiency, a 3-phase generator using rare earth  permanent magnets has been specially designed for the turbine.

Mechanical
The generator is designed to work at low rpm and so can be directly driven by the rotor. A gearbox is therefore not needed, thus eliminating a source of inefficiency, noise and potential maintenance problems.

At a particular location, the wind speed will vary about an annual mean value.  The expected energy yields for the AT5-1 at various annual mean wind speeds (AMWS).

AMWS m/s Annual MWh Daily kWh
3 1.84 5.04
4 4.75 13.01
5 8.74 23.94
6 13.15 36.03
7 17.35 47.54
8 20.93 57.35

Note: The annual electricity consumption of a medium size home is in the region of 4 to 6 MWh.  This is equivalent to a daily consumption of 11 to 16 kWh
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