How can an car alternator be used as a wind generator?

wind generator

How can an car alternator be used as a wind generator?
I am talking about an electric car alternator, an electric alternator needs a current first to generate magnet, then the rotating magnet generates electricity. In the wind power case, at the beginning, there is no electricity to generate magnet, how to make electricity?
Thanks.

Best answer:

Answer by G33K
An alternator is already a generator (i do believe it is a DC current, since that's what a car's battery runs on). All you need to do is mount it higher, remove the wheel that the belt goes onto, and connect the alternator to a voltage regulator and a battery. If you want to connect it to your house to help ease your electric bill, you need an AC power inverter. Here are a few helpful pages:

http://www.alton-moore.net/wind_turbines.html
http://www.ehow.com/how_5263227_build-wind-generator-car-alternator.html

Know better? Leave your own answer in the comments!


2 Responses to How can an car alternator be used as a wind generator?

  1. molitor

    connect it to…wait for it…a battery!

  2. Rudydoo

    Hey HP, you can use a car alternator for a wind turbine, but it turns out to be a lousy application, I’ll explain. We actually built one some years ago, since the alternator needs battery power to excite its field, it draws a small amount of power from the battery all the time, while it produces, and also while it is waiting for wind. At the end of a day, a good portion of it’s produced energy was used up waiting for wind to blow. On top of that, the car alternator is designed to be lightweight, and operate in a very large range of RPMs, it is very inefficient in terms of power produced for horsepower input, and they always come with a belt pulley attached, something no wind turbine would be caught dead using.

    If you want to build your own turbine, get a small electric scooter motor. They are inexpensive, small, have permanent magnets and ball bearing races so they are more efficient, and many have a chain cog on the shaft, a much better application for wind power. You’ll have to gear it up a bit so it turns at maybe 1500 rpms or so, but the no. 25 chain they use on them is lightweight and inexpensive, and you can get a larger cog for the propeller shaft on your turbine for just a few dollars. I will list a good website below for parts.

    We have a turbine operating at our place, but it is a commercially manufactured one. I tried building a few, but my handy work was not up to the challenge. I have a few other sources you might be interested in below also. Good luck, and take care, Rudydoo

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