That is a very large subject, and the answer won't fit in here. So you are going to have to spend some time on some research in the library and on the internet. Just run an internet search on "how to build a wind turbine," and you will get a large number of information sources.

Most amateur wind turbine projects are failures, and it takes a really clean design and industrial scale manufacturing facilities to build a successful one. If you want one for your own residential or commercial power system project, you will be well advised to buy a commercially manufactured one. Again, you can find all the products you want for sale on the internet.

There are two main types of wind turbines that amateurs have attempted to build. Some of these people had very sophisticated mechanical knowledge and skills, but most of them didn't work, or didn't hold up very well. There are vertical axis and horizontal axis turbines.

A vertical turbine has the advantage that it does not need to swivel to face into the wind. There are a number of popular designs for them made out of oil drums and other available materials.

A horizontal turbine is like those used in commercial wind farms. A number of small models are available for home use. It has to swivel into the wind, which means you need a swivel mechanism for transmitting the electric current from the swivel part to the stationary part. This is a complex, high maintenance assembly.

You can also find plans and kits for horizontal turbines, but again, the commercially made ones are the practical answer.

Sorry to be so pessimistic, but I have seen too many smart people try to build wind turbines and end up doing something else.

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How to put a vertical axis wind turbine together. From the turbine to the stator I’ll be putting up videos explaining exactly how I did it. Once I figure it all out that is.

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http://www.maglevwindturbine.com

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Home Wind Generator Systems
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Backyard wind power: Skystream 3.7 is the revolutionary new wind generator designed for utility-connected homes. Reduce your electric bills with clean, renewable wind energy.

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How to Build Your Own Wind Turbine For Home
If the increasing cost of electricity is one of your problems at home, you might want to consider some alternatives like build your own wind turbine or install solar panels on the roof of your home. In recent years, more people have seen the wisdom in using these alternative sources of energy to alleviate their growing electrical expenses. Through any of these options, you will surely see a significant cut in your electricity bills, allowing you to enjoy more savings.

In particular, there are three important concerns to be thought of before deciding and starting to build a wind turbine that you can use at home. First, you need to find a place where strong wind force can be experienced. For wind energy to be converted into electrical energy, minimum wind speed should be about 10 kmph. This almost always does not happen in urban areas so you would have to consider a rural place for this endeavor. Moreover, the place where you are to place your wind turbine should not be surrounded by trees and other obstructions so as not to impede wind strength.

Second, you have to carefully follow the steps in making a wind turbine. The Internet is a rich resource for comprehensive guides in building such. Also, make sure that you have all the necessary materials for making the turbine. Some of the more common materials for this type of project are blades, generator, and battery. A tower where the wind turbine is to be attached to is also required. To avoid functional problems, make sure that you complied with all prerequisites and followed the procedures enumerated in the guide carefully.

Lastly, make sure that you are not violating any local government provision before you build your own wind turbine to avoid being penalized later on.

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How to Build Your Own Wind Turbine For Home

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i asked this question in y!ans three times but no one is giving the right answer.ok,i am in grade 5.i need a complete guide (with images) to build a simple small wind turbine generator for producing electricity.i will show it in my science fair. plzzzzzzzz no disgusting answer plzzzzzzzzzzzzzzz

Look at this site.

http://www.instructables.com/id/How_I_built_an_electricity_producing_wind_turbine/

This is a small turbine, but to get it in a science fair , I would divide all dimensions by 4 or so.
So if they tell you to measure for a 8 foot diameter turbine blade you make a 2 foot diameter one.

For power production you have to go a lot more. If they say to get a 800 watt generator, you might have to get a 20 watt generator, because a 8 ft blade captures a lot more wind energy than a 2 ft blade.

I would make the blade out of a wood board and shape it like an airfoil. I would use a bicycle generator (used for the lights on a bike) for the and epoxy the blades to the end of the generator.

Thanks to your many very helpful answers to my previous questions I was able to find a company that sells such a device. As you may recall, I was intrigued by this device: http://www.clariantechnologies.com/main/page_home.html. It is a vertical axis wind turbine driven async motor that acts as an induction generator that plugs directly into an existing outlet in your home. No inverters, no batteries. Sales price around $500. With an electric meter (a freebie from our power company) than can run backwards, this would allow me to greatly reduce my energy bill all at a very low cost. To make the cost even cheaper, and to increase the power output, I want to make my own wind turbines, and use my own async motors. So all I need is the controller.

I have found a company that sells such a device: http://www.prairieturbines.com for $830. It connects a 5500 watt wind turbine driven async motor directly to the grid. No inverter, no batteries. It uses a "hall-device" to measure the RPM, it provides about 1 AMP to the motor to energize its coils, 50amp solid state "zero-cross relays", capacitors, 30amp breaker/enclosure, an exterior mounted disconnect, and an interior-mounted fused-control voltage switch. This is it!!!

So my question is, does anyone know how to build this controller. This company doesn't sell the plans to this, and $830 is too high for me. I am sure I could build this with components for less that $400. If there is any electrical engineering person out there that can help, this will be a challenge, but it is great knowing that someone already has figured this out and is selling it.

Look at the Prairie Turbines site again. The price of the micro-controller including the hall device is $255. The $45 book provides a complete list of material and instructions to build everything else.

The micro-controller monitors the speed sensor and provides control signals to two solid-state relays. One relay connects the motor to the grid when the speed reaches the motor’s 1800 RPM synchronous speed and disconnects the motor if the speed drops below 1800 RPM. The other relay is energized to release the brake when the controller is energized and de-energized by the controller when the motor speed exceeds the maximum safe operating speed. If this occurs, the controller apparently must be manually reset.

I did not find the maximum safe operating speed stated on the web site. If the full load speed of the motor is 1750 RPM, the full load slip is 1800 minus 1750 or 50 RPM. The speed at which the motor would generate full load current and present full load torque to the turbine is 1800 RPM plus the full load slip or 1850 RPM. With the design described, a three-phase motor is connected to a single phase source with capacitors connected between the source and the third motor phase. That is likely to increase the motor slip somewhat.

I am not sure what happens if the motor is driven above the speed at which it generates full load current. A three-phase motor operating as an induction generator connected to a three-phase supply has a torque vs. speed curve that is something like the mirror image of the motoring torque vs. speed curve. The curve is likely different with the single-phase connection used in this case. I don’t know what the speed vs. current curve looks like in either case, but I will see if I can find it. I am also curious to know if the Alan Plunkett listed on the web site as an author is the Alan Plunkett that is well known author of technical papers on inverter and variable frequency drive subjects.

Added information:
I found information indicating that, for a 3-phase motor connected to a 3-phase supply, the speed vs. current curve for induction generator operation is like a mirror image of the speed vs. current curve for motor operation. That would mean that the maximum speed would need to be limited to the synchronous speed plus the full-load slip. The web site indicates that the full-load speed for the motor that they used is 1725 RPM for 3-phase operation. That would make the maximum speed 1875 RPM plus the additional slip due to the single phase with capacitor arrangement.

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How Solar Energy Is Converted To Electricity
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How Solar Energy Is Converted To Electricity

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