Design and development of megawatt wind turbines - Wind Power Generation and Wind Turbine Design - page 237

Figure 33: Generator, converter and LV cable - 10-turbine analysis results.

Figure 34: Generator mass - 10-turbine analysis compared to industry study set.

unit surface area of the rotor stator air gap) also tends to increase resulting in

increased torque density (Nm/kg) and hence the convex curve shape.
An alternative to this trend would be if the gear ratio were to be fi xed instead of
varied. Generator rotational speeds would then decrease with increasing power
rating, which would increase the generator rated torque faster than the power rating.
For this scenario, the curve shape would tend away from the convex shape [31].

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