Have to get to fifteen posts....
ya, thanks for remind, i knw tht we can't create energy.MechaMZ, You need to understand that no matter what kind of alternator you use, you cant produce energy which is not there, because you are not "producing" energy, merely transforming wind energy to electrical energy.
Its the turbine size you should be worried about, maybe blade profile etc etc
I am afraid the more you add gearboxes, more you are going to increase losses. Keep in mind, smaller the number of units, more is the efficiency.just because I want to reduce the losses as least as i could.
any suggestion for the gear type?
not very understand, could you further explain?a wind turbine in very 'windy' conditions is feathered(AoA is made close to zero) to reduce the speed below a minimum safe level??
No No, you are still doing the same mistake, increasing the speed wont 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.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 :)
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.not very understand, could you further explain?
Connecting the turbine to a generator will slow down the rpm.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 :)
but what are the factors actually will affect the rpm?
thanks, I will take note for this. By the way, for the shaft connection between turbine and alternator, I should use gear directly or belt such as timing belt?No again, you are still missing the point.
What I wanted MechaMZ to do, is, this "feathering", "windy" thing in reverse. Increase the AoA(angle of attack equivalent to decrease in pitch).
Come to think of it, I am having a hard time imagining the pitch for a vertical axis wind turbine, how does one describe the pitch of a VAWT??
I actually have seen how feathering works, in my fluid systems lab, & variable stator vanes of the LPC(low pressure compressor) on V2500Jet Engine. I only meant i haven't seen a wind turbine in action.
Isarmann, I didn't get this, "The tail always follows the wind, of course, so some kind of hinge arrangement allows the turbine head and blades to fall off in one direction; off the tail's axis, as it starts to overspeed."
Could you please explain??
I made a mistake, should be generate 50W in 12hours.Hi
I've a wind turbine which have to run under a very low wind speed, from 2-3m/s.
Currently, I'm using Envirotek V20, the result is around 1.5V-2.5V, and current is 0.3mA or nearly zero.
My aim is to achieve 50W.
Any suggestion for the alternator which I should use?
p/s: without aided by any gear arrangement.
with how much surface area facing the wind and how many turbines do you plan to use?I made a mistake, should be generate 50W in 12hours.
Favorite technique seems to be 20-30 small high-strength magnets around the hub of a car wheel bearing (usually a Volvo) and a lot of home wound coils.so you want lots of poles. Will the alternator need a thrust bearing to support the rotor load (weight)? How much thrust?