Wind generator

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Alain G
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by Alain G » 17/03/10, 21:34

winewine

Before using an engine for your wind turbine, you will give us the make and model, so we can advise you better and you will not work in a vacuum as many have done before!
:D
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Forhorse
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Re: to know how to run the engine




by Forhorse » 17/03/10, 22:50

dedeleco wrote:These model aircraft engines need a regulator
http://www.conrad.fr/controleur_brushle ... 434_488998
that deliver tension at the right time.
It is not intended to use them as an electric generator.
You can try it by forcing it to rotate quickly and measuring the voltage and current delivered alternately on each winding to measure the actual performance.
There is a big risk that the alternating voltage is not alternating but in the form of short pulses oscillating once per revolution of the motor and therefore not very usable without another regulator to build, not found in the trade!
To measure well you need an oscilloscope!
These engines are designed for various uses: fast or slow stepping aircraft but very high torque.
For a wind turbine you need a fairly slow rotation speed but not step by step where the torque is too strong and blocks the wind turbine, in my opinion.


The output current will be three-phase (if the motor is a three-phase like those shown on the links I gave)
But as much the control of the type of motor is complicated (an inverter is necessary whose phases are in correspondence with the magnetic poles of the motor) as much the use of the current when it is used in generator is not more complicated than with any alternator: 6 diodes are enough to obtain direct current.
The resistant torque depends on the applied load, like any generator.

For my part I have already done some tests with a brushless motor of 200W recovered from an industrial servomotor and it works very well.
It is given for 100V of nominal voltage at 3000rpm
By turning it by hand, when empty, the voltage easily rises to 10V
When the leads are "in the air" there is almost no resistant torque. On the other hand, when the three phases are short circuited it is difficult to turn the axis by hand.
For me it is the ideal generator for this kind of project because even at very low speed it is able to output a large current.

For regulation, I think we can use a solar MPPT regulator, their voltage input range is very wide (the one I use theoretically accepts up to 100V) and they are able to take advantage of this high voltage input to deliver a higher current output.
The only downside of this solution is the braking of the wind turbine which will not be managed by this kind of regulator.
The best in this case being to manufacture or even are regulator, but it requires skills in electronics and / or a lot of personal research. (but for someone who has the time this is a very interesting project)
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winewine
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by winewine » 18/03/10, 18:50

I don't believe it is a stepper motor, so it must be a continuous "must" one, which requires a controller. Think the same controller works for the engine and for the generator (if it's reversible)?
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Forhorse
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by Forhorse » 18/03/10, 20:13

No, as most of the rotating machines are reversible, as much as the controllers are not at all (except if they are specifically designed for)

If you put a photo of the engine in question ... we would already know a little more about what we are talking about.
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oli 80
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evolution of wind turbines




by oli 80 » 18/03/10, 20:14

good evening, here is an interesting video about the evolution of wind turbines through windmills http://www.youtube.com/watch?v=376UAQWKbck&feature=fvw

you may find what you are looking for
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