I want to build a generator sorta like the ones they build for windmills?
I have learned the larger u make the disc and the more magnets u use the slower it has to turn to make electricity. The magnets they sell for this are high priced as all get out and I am wondering two things. Can I use welders magnets that are designed to hold steel in place until it is tack welded, and 2nd., can I cut the magnets. I am a welder and have used these magnets for years. I have some that are more than 20 years old and they still work great and I can buy some at www.harborfrieght.com for $ .97 each compared to 30 bucks for the same pull that thay sell for building generators for wind mills. HELP if you can. No one in the business will answer my e-mails.
Anonymous2008-10-30T18:14:14Z
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You are correct in that the larger the disc the slower the revs have to be.
If you want to design a generator yourself, you have to use high grade neodymium magnets which are cheap and readily available on Ebay. Use the 1" round by 1" high cylinder magnets. They fit nicely into a rotor disc where you have drilled equally spaced 1" holes. Care has to be taken that the holes are spaced so that the phases when the magnets pass over the pick-up coils are correct ..... so you get the maximum amplitude out of the coils. In other words - if the spacing is wrong and the magnets are too close together or too far apart, you get a distorted waveform of lower amplitude.
I can tell you that by experience. I build a 16" motor generator out of nice 1" Lexan discs and did not check the spacing of the 16 magnets....... Needless to say, I have to build a completely new device which is a very expensive undertaking when one looks nat the price of a lexan sheep of 1/2" thickness costing $750! . I had to machine a mock-up device where I could vary the distance of the magnets which I mounted in a drill. the balanced device passed in front of a pick-up coil mounted in a vice and I monitored the waveform of the coil on an oscilloscope. At one point/setting I got a beautiful sine wave with minimum distortion AND maximum amplitude. THAT was the perfect distance producing the most efficiency in current/voltage.
Having said that - you need of course the pick-up coils which you have to wind yourself on large plastic bobbins using heavy wire like 1.5mmm transformer wire. The coils have to have a soft iron core for best efficiency. That can be of REbar material and should be ,machined and tightly fixed in the coils.
I used an odd/even configuration re magnets and coils to overcome the STRONG cogging effect. That means I used 15 coils on the stator plate and 16 magnets in the rotor disc. That way the cogging effect is mostly neutralized.
I can help you out if you like - having experimented for quite a few years with Over Unity devices, "free" energy, MEGs etc (Look up Bearden, Bedini and others). Unfortunately..... I have not been able so far to get more out of a device than I put in :(
I could tell you way more - but time is sort of short at this very moment. I can tell you what to avoid......