- #36
ank_gl
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MechaMZ said:btw, now my rpm is around 160 at 4m/s, I'd have to increase it to 260. So I think gearbox is needed. of course I will increase the blade size as well :)
No No, you are still doing the same mistake, increasing the speed won't do you any good, as the torque will be decreased. Alternator demands both torque and rpm(remember power = torque*angular velocity), it is this energy that will be converted to electrical energy.
A wind turbine works in varying environmental conditions, so if it were to operate at a constant blade pitch, its rpm would vary, but you already know that power generated has a fixed frequency, so the rpm of the turbine needs to be controlled, to give a preset frequency of AC produced.MechaMZ said:not very understand, could you further explain?
The rpm is controlled by what is known as feathering, ie, the pitch of the blade is varied as to give a defined rpm for the unit. That is why during very windy condition, blades are almost parallel to the flow, and during calm environment, they are almost perpendicular to the wind.
I haven't actually seen a wind turbine, so I really don't know that much, just a bit of theory. Someone else may be able to describe it better i guess