Self-built wind turbine with electric bike engine

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Christophe68
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Re: Self-built wind turbine with electric bicycle motor




by Christophe68 » 14/11/18, 12:43

Pierre820 wrote:Thank you so I will have to find a wind turbine regulator or try to tinker one from a vae regulator.

That will not work! A vae regulator converted from direct current to three phase, not vice versa. The schematic diagram of a step down is as follows:
https://fr.wikipedia.org/wiki/Convertisseur_Buck

A regulator of solar panels can work on condition of protecting it from over-voltages, it is imperative because it is not designed to support the voltage dynamic of your generator.
generator => rectifier => surge protector => solar regulator => batteries

Pierre820 wrote:For the engines, I will probably turn to hoverboards because they are actually cheaper and easier to find for equivalent powers, especially since my plan for the flywheel fell into the water.

Yes it is more convenient to fix too.
Otherwise there is also the auto alternator which already has its suitable regulator and supports good dynamics. To be used with small blades or a booster.

If your plan falls apart and you're not in a hurry, a good practice would be to install an anemometer for a season by monitoring to assess the potential of your location.
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izentrop
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Re: Self-built wind turbine with electric bicycle motor




by izentrop » 14/11/18, 14:46

Christophe68 wrote:Otherwise there is also the auto alternator which already has its suitable regulator and supports good dynamics. To be used with small blades or a booster.
Yes, there is the problem of the speed and therefore of the "overdrive", but also that the excitation draws current even when it is not running. A 3 watt lamp indicates that a minimum of 0.25 A is flowing. It would take an electronic circuit to feed it only from a certain number of revolutions minutes.
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Pierre820
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Re: Self-built wind turbine with electric bicycle motor




by Pierre820 » 16/11/18, 12:22

Hello. So my project goes on. I will not use an alternator regulator it is too complicated.
So I'm going to go on a hoverboard wheel of 350w in 36v.
Then I give myself two options.
-or a rectifier bridge, then surge protection, regulator and battery.

- either a vae regulator with the regeneration option then a DC-DC converter to arrive in 12v at the wind turbine.

I came to these conclusions thanks to you and also by going to watch the Youtube channel of Tchangly21 which really makes great invention with hoverboard engines and tinkers with electronics a lot.
In fact, almost all the vae controllers have the factory regeneration function. Except that they are almost never wired. So the choice will be more financial but also practical.
With the vae controller no need for a rectifier bridge or surge protector because I suppose that once the battery is full it cuts the load and puts the generator in freewheeling. (I'm not sure, point to check).
Besides, where is a surge protector located? Maybe it has to be made?
Next I still have to look at the cost of each option.
But it's on the right track! : Cheesy:
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Re: Self-built wind turbine with electric bicycle motor




by izentrop » 16/11/18, 12:39

Pierre820 wrote:Besides, where is a surge protector located? Maybe it has to be made?
To do what ? if you are afraid of lightning, you put the mast of your wind turbine on good ground. : Mrgreen:
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Re: Self-built wind turbine with electric bicycle motor




by Pierre820 » 16/11/18, 16:12

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izentrop
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Re: Self-built wind turbine with electric bicycle motor




by izentrop » 16/11/18, 22:26

Seems a bit expensive and then 15 V is not the end of charge voltage, the battery would be cooked from the first charge, but the braking voltage.
Not fortunes for wind specialists.
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Pierre820
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Re: Self-built wind turbine with electric bicycle motor




by Pierre820 » 16/11/18, 22:45

Ah yeah it's clear that the price is something else !!
In this case this one would not be more suitable?
https://www.ebay.fr/itm/400W-12-24V-Wind-Turbine-Generator-Charging-Charger-Controller-Regulator/142853886970?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D2%26asc%3D20150519202400%26meid%3De4132dff691a4df0b4139580df9a887c%26pid%3D100408%26rk%3D1%26rkt%3D8%26sd%3D172814800174%26itm%3D142853886970&_trksid=p2056116.c100408.m2460

It would make me a cheap wind turbine anyway.
A hoverboard motor at 15 € and a regulator at 20 €
I have to turn around 50 € by counting the materials for the blades and the mast it will be the recovery.
Because if I take this regulator I don't need anything else if?
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adonis57
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Re: Self-built wind turbine with electric bicycle motor




by adonis57 » 20/11/18, 14:56

HELLO : Cheesy:

Interesting subject on which I have already worked, I would like to clarify some basic data which seem poorly understood:

KV : This is the MAIN characteristic of the alternator or three-phase motor that you will use as an Alternator. It is therefore the first criterion of choice.
Quézaquo?
It is a coefficient (without unit therefore) between the speed of rotation, and the voltage of the engine / alternator.

Example, a KV of 100 gives 1000rpm under 10V. Simple, right?
Normally it must take into account the "electrical slip", that is to say the loss of rpm under load.
So our engine / alternator must give 10V at 1000rpm, at its nominal power. This is not always the case, and some Chinese in particular give it up. In this case remove 10% and it should not be very far.

A brushless motor with permanent magnets can be used as an alternator with a three-phase rectifier bridge behind. Ex: Hobbyking motors, VAE wheel motors, brushless motors on certain washing machines (directly connected to the drum).

A wind turbine, depending on its size, rotates from 500 to 3000rpm approximately, of course there can be extreme cases outside.
So to work live, we will aim for say 1000rpm to have the minimum voltage sufficient to start charging.
In 12V there is therefore a KV around 100, in 24V around 200.
To test it it's quite simple, rotate at a known speed, and measure the voltage with a voltmeter, divide.

The recovery engines / alternators suitable for wind turbines are rare, because of the KV which is too high in general.
Ex: automotive alternator rotates at 5 rpm for 000V, 15 rpm max. A belt reducer will make noise and lose a lot of efficiency.
Ex: The brushless washing machine motors are suitable (LG, SAMSUNG, some Whirlpools), but not those reduced with a belt (these take 10 rpm and are charcoal)

In model making motor it is quite rare and only the big motors they are all higher KV. Or high efficiency drone motors, or "guimbal" motors to direct cameras. Almost any eBike wheel hub motor is suitable, since a bicycle wheel spins at roughly the same speeds as a wind turbine.

Then the second dimensioning criterion is the power, always over-dimensioning, for example a brushless motor of 1000W under 24V kv100 is dimensioned to support 1000W / 24 = 42A roughly. This will make a good 500W alternator, it will work with a better output at 20A. The regulator will also have to be oversized.

You will understand that it is important that the wind turbine has the lowest possible speed range (not variable)
Otherwise between 1000 and 3000 rpm, the charge regulator will have to collect 3x more voltage to charge the battery.
If it is a PWM, it will heat up, loss of efficiency.
IF the wind turbine goes into overspeed, cramage in sight.
Without variable pitch, compulsory active orientation (feathering), (except turbine any direction of course, but which all have a lower output)

Good research, I am ready to analyze any find that you will make to determine the best conditions of use.
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Re: Self-built wind turbine with electric bicycle motor




by Pierre820 » 20/11/18, 16:51

Hello Adonis.
Thank you bpourcettebpetite review of the characteristics that must have a wind turbine.
So if I got you a hoverboard motor that has a KV of 15 is too "small"? I will run the risk of running it too fast and therefore burning out the governor or even the engine.
Isn't there a regulator that can handle a fairly large voltage range?

I am well aware that I will have to do tests on site and that my simple observation will not be enough.

For the wind turbine model that I want to build (see the soupl'éole and micro soupl'éole site), the blades are self-adjusting according to the power of the wind and it is possible to adjust this setting depending on what you are looking for torque or speed. On the other hand, no feathering possible since it is a leeward wind turbine which also has the particularity of better following the bed of the wind without constantly seeking it.
Since there does not seem to be any precedent for my project to my knowledge, and since it requires little investment, I embark on the adventure. I will send you updates step by step regardless of the outcome. Whether it is effective or not, I wish to advance even empirical knowledge on the subject. Because if it works it could make it possible to make certain off-grid sites standalone at low cost as I am. (In addition to the sun which also seems essential to me.)
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Re: Self-built wind turbine with electric bicycle motor




by izentrop » 20/11/18, 17:43

A handyman tested the 350 W hoverboard motor in a wind turbine generator http://bricolsec.canalblog.com/archives ... 71043.html
Result of measurements:
Image

Then he changed the winding ... http://bricolsec.canalblog.com/archives ... 42312.html
Depending on the modification of the winding connection, we can therefore see that the modification of the winding scheme has doubled the voltage and that we are approaching 100W since at 422 rpm we are at 91W (27.6V * 3.3A! Won!
It will remain to verify that the windings are not overheated.
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