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DIY 1000 watt wind turbineby sspence on June 2, 2006

Table of Contents

License:   Attribution Non-commercial Share Alike (by-nc-sa) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Intro:   DIY 1000 watt wind turbine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

step 1:   Build the magnet disks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

step 2:   Build the coil disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

step 3:   Build the bearing assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

step 4:   construct the blades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

step 5:   Bolt it all together . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Related Instructables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Advertisements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

http://www.instructables.com/id/DIY-1000-watt-wind-turbine/

License:   Attribution Non-commercial Share Alike (by-nc-sa)

Intro:  DIY 1000 watt wind turbineWe built a 1000 watt wind turbine to help charge the battery bank that powers our offgrid home. It's a permanent magnet alternator, generating 3 phase ac, rectified to dc,and fed to a charge controller. The magnets spin with the wind, the coils are fixed, so no brushes or slip rings necessary.

step 1: Build the magnet disksWe had 12" steel disks hydro cut. We cut a template for mounting the magnets. Then we mounted 12 grade n50 magnets around the outside edge. We then built a form,and poured the resin with hardner.

http://www.instructables.com/id/DIY-1000-watt-wind-turbine/

step 2: Build the coil diskWe wound the nine individual coils, soldered them in a 3 phase wye configuration, and encased them in resin. We used 35 turns of 2 parallel strands of 14 gaugeenameled (magnet) wire for 12 volts. Use 70 turns of single strand for 24 volts. # 3 phase diagram shown here shows 3 stator coils. each of those coils is actually 3 coilsin series. coils 1,4, and 7 are series together, 2,5, and 8 are series together, and 3,6, and 9 are series together.

more details, see the following page 15 for the series star, 1-y diagram.

http://www3.telus.net/faheydumas/Wind_Turbine/Forum/AXIAL_FLUX_HowItWorks.pdf

http://www.instructables.com/id/DIY-1000-watt-wind-turbine/

step 3: Build the bearing assemblyTwo Harley Davidson wheel bearings are inserted into the pipe, with a smaller pipe locked between them to keep them in place.

http://www.instructables.com/id/DIY-1000-watt-wind-turbine/

step 4: construct the bladesThe blades are 2" x 6" pine, cut at 10 degrees on a table saw, and sanded into a rough airfoil. Not perfect, but close enough.

More can be found at

http://tech.groups.yahoo.com/group/axialflux/

http://www.green-trust.org

http://youtube.com/watch?v=o9EEHFKEckM

step 5: Bolt it all together

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Comments50 comments Add Comment view all 1058 comments

 iloveairsoftstuff says:  Sep 23, 2010. 9:15 AM  REPLYinstead of coils and magnets could you just use an electric motor you have laying around to produce DC current?

 sspence says:  Sep 23, 2010. 2:55 PM  REPLYyou might be able to, if it's sized correctly.

 ashbranmeg says:  May 5, 2010. 11:25 AM  REPLYDid you alter the polarity of your magnets? If not, wouldnt the output of your generator be DC with no need for a rectifier? If there is no alternating of the field,there will be no reversing of the flow? That means DC not AC?

 Seminumerical says:  May 16, 2010. 7:22 AM  REPLYCoils can only generate electricity in an alternating magnetic field.  Hence, you always get AC when using coils.  I have never heard of anythinggenerating DC using magnets, without a rectifier.  But DC can be generated with solar PV-cells, peltier-elements or chemically with batteries.  Anothersource for AC is piezo-elements which generates current when sqeezed.

 ashbranmeg says:  May 16, 2010. 2:47 PM  REPLYI dont wish to start a long drawn out discussion on electrical theory here, but you are incorrect. A coil will move electrons any time a magnetic fiel ispassed across it. AC is generated when a magnet is spun with first the north pole moving electrons in one direction then the south pole in theopposite direction and so on.

If you design a generator where only the north pole of your "field" passes through the coil you will generate dc. Granted it will be pulsating dc. Youclean up the pulses by having enough coils to fill in any "gaps".

Many homebuilt wind turbines use permanent magnet DC motors, because they are designed with rotataing magnets that operate in this very way.Most DC permanent magnet motors when spun will produce DC voltage that can be connected directly to your charge controller.

To say that you can generate only DC with a coil is incorrect.

 staida says:  Aug 5, 2010. 8:51 AM  REPLYThese "gaps" are a sawtooth wave. It's still a waveform, you haven't rectified that current thus you still require a rectifier. Calling it dc when it's stillone side of an AC wave (in that pesky theory you wanted to avoid) doesn't earn you any points.

http://www.instructables.com/id/DIY-1000-watt-wind-turbine/

 ashbranmeg says:  Aug 5, 2010. 11:34 AM  REPLY"sawtooth wave"? I am assuming you mean pulsating DC. This wind generator would presumably be used to charge a bank of batteries thatwould be providing power for an inverter. What you dont seem to know is pulsating DC is used quite frequently to charge batteries. I called itDc because that is exactly what it is, be it pulsating DC. I am not interested in "earning points", but rather am trying to point out that it is notnecessary to rectify pulsating Dc to charge a battery. Most store bought automotive battery chargers use pulsating DC to charge batteries, Iwould recommend doing some research before claiming that pulsating DC is not useable in this application.

 sspence says:  Aug 5, 2010. 12:08 PM  REPLYThis wind generator does not produce dc. it produces 3 phase ac. A rectifier (6 diodes) is necessary to convert it to dc for batterycharging.

 ashbranmeg says:  Aug 6, 2010. 2:45 PM  REPLYYes sir, I understand that you built this to generate 3 phase AC. This particular comment string started when I posed the idea ofkeeping the polarity of your magnets the same and producing pulse DC, which would negate the need for a rectifier. The easier wecan do this, the more eliable things will be. If we dont need a rectifier, then we wont have a rectifier to fail later on.

 sspence says:  Aug 6, 2010. 3:11 PM  REPLYFeel free to start a new instructable, please don't hijack mine.

 sspence says:  May 5, 2010. 2:58 PM  REPLY Yes, the magnets alternate polarity. Trying to make a dc gen directly is an interesting concept. let me know how it works.

 jetboy says:  Aug 1, 2010. 6:01 PM  REPLYwhat size are the coils how thick wide and tall

 rapidprototyping says:  Jul 25, 2010. 5:07 PM  REPLYthe most important thing about prototyping is falling down and getting back up looking for better way to do it take lighting are led's any better then edisonsincadesent light bulbs certainly not any cheaper. or maybe we took wrong turn way back then and should have been on low voltage all along our devicesseem to be working fine on it. My 12 volt weed eater does lots work

 rapidprototyping says:  Jul 25, 2010. 4:52 PM  REPLYright generator wrong rotor. try a savanious rotor and have that same cat cut your discs and cut 15 aluminum pipe in half so cat and weld it all in one unitthen balance that whole thing like they do tires when you mount them. here is photo of the one i built in 1980 wish it been all aluminun and had magnetsholding it up off its bearing also consider a saphire bearing on bottom center pivot point. love the build my own generator concept best atenpt so far i'd saythe other guys power electronics weren't bad. one with tilt up tower

 Geedigity says:  Jul 24, 2010. 3:36 PM  REPLYWhat about using the N52 magnets? They should be stronger than the N50, thus more power??

 jetboy says:  Jul 7, 2010. 1:18 PM  REPLYabout how many feet of wire was used total and what is the size of the magnets

 sspence says:  Jul 13, 2010. 3:08 AM  REPLYThis was already answered in the instructable and it's comments.

http://www.instructables.com/id/DIY-1000-watt-wind-turbine/

 sinoneo says:  Jul 13, 2010. 12:23 AM (removed by author or community request)

 sspence says:  Jul 13, 2010. 3:08 AM  REPLYAnd if you read the instructable, you's know that indeed it is using rare earth neodymium magnet. guess you were just using this opportunity to sell yourown product?

 napjax3000 says:  Jul 11, 2010. 5:53 PM  REPLYI've been interested in using wind power for some time now. Just didn't want to spend a ton of money doing it. Thanks for the instructions and illustrations.This really helps.

 cnbmnm says:  Jun 26, 2010. 4:44 PM  REPLYIs there a way to substitute wind for magnets? If I built this I would not want to depend on wind but magnets to generate the power? And when you say 1000watts. Is that making a 1000 watts per hour? or day?

 SwordmanJr says:  Jun 29, 2010. 7:11 PM  REPLYMagnetism is not a form of energy. It's a property of ferrous metals. All those scams out there about allegedly harnessing the power or energy ofmagnets is pure bull. I'm an electrical engineer who has studied those scams, and found them to be nothing more than money-making schemes by rip-offartists fleecing unsuspecting people who don't know better. The 1000 watt rating is an instantaneous measure, not a time measure, such as killowatt-hours.

 sspence says:  Jun 26, 2010. 5:09 PM  REPLYWind spins the magnets. Magnets don't generate power, that have to be spun with a power source. 1000 watts is a instantaneous measurement. If thewind blows 30 mph for 6 hours, it generates 6000 watt hours per day.

 ChuckP says:  Jun 4, 2009. 2:03 PM  REPLYI am on the grid, and would prefer to develop a generator that connects directly to my panel so as to avoid the cost and maintenance of batteries and aninverter. It this possible with this system? Thanks for all the work you have put into this.

 sspence says:  Jun 4, 2009. 2:16 PM  REPLYThis unit is not appropriate for direct grid tie.

 ChuckP says:  Jun 4, 2009. 2:25 PM  REPLYWhat would it take to make it so? I am assuming that the magnets are placed with alternating poles facing the coils which will then generate AC. Ialso assume a voltage regulator would be needed. Is there something in the design of this system that makes it inherently incompatible with the grid?Sorry to bug you about this, but I don't have $500 for batteries and $1,900 for an inverter. Also, I read in a previous post that the steel plate was 1/4".Is that thickness essential, or can I use a piece of sheet metal that I can cut with tinsnips? Thanks again.

 Jissan says:  Jun 26, 2010. 12:50 PM  REPLYA voltage regulator is so named because it only controls the voltage. If you want to connect it to the grid, you not only need to have the correctvoltage, you also have to match the incoming AC sine wave position and speed(we all know in North America we use 60Hz). 1)If you want togenerate off grid, you can use a simple inverter that can be bought at some surplus stores or Canadian Tire has them as well. 2)For connecting tothe grid, you need a "Grid Tie Inverter" it reads the incoming sine wave and matches it. I have seen them on e-bay for anywhere from $450 to$500. -For either of the inverters, you need to use a 12v or 24v battery for it to feed off of. **Note** depending where you live, you may NOT beallowed to use some Grid Tie Inverters. As some are NOT ESACSA approved, they can not be used in Ontario for example**

 sspence says:  Jul 29, 2009. 5:09 AM  REPLYTo make it grid tie, you would need regulated rpm, out of the range of most hobbyists.

 Dr_Stupid says:  Sep 26, 2010. 12:42 AM  REPLYThat's not necessarily true to make it a grid tie-in system. It would just need to have a sine-wave inverter between the battery bank and thepower company's side of things, then you'd be good to go. It's pretty common to do 'em like that in PV systems.

 sspence says:  Sep 26, 2010. 4:13 AM  REPLYNo, you would need a battery bank and a grid tie inverter, like the Outback GTFX series, not just a sine wave inverter. The question wasdirect connection. That's not possible.

 mynumber1 says:  Jun 16, 2009. 4:38 AM  REPLYin terms of can you a thinner metal the answer is yes but it makes it more complex i work and design large scale generators and we dont normallyuse large single peices of metal if you used a thinner metal but layered it would work the same for but what we normally do is layer with applinginsultive coating around each layer this allows for minimizing eddy current loses in your generator due to generator action occuring in the core

http://www.instructables.com/id/DIY-1000-watt-wind-turbine/

 ChuckP says:  Jun 16, 2009. 12:01 PM  REPLYThanks for your comment. What would suffice for an insulative layer? Sheet metal has a thin coat of zinc over the steel; would that beenough? If not, would a coating of urethane work? And would the layers of sheet metal need to be 1/4 inch thick to have the same effect?

 sspence says:  Jun 16, 2009. 12:19 PM  REPLYNo insulative layer is necessary, it's just a steel plate with magnets on it. There's no electricity flowing on it or through it. No layers arenecessary either. Sheet metal will not work. It has to be iron/magnetic steel. It needs to be at least 1/4" thick.

 mynumber1 says:  Jun 24, 2009. 5:10 AM  REPLYno it does not have to be iron or magnetic steel it simply has to be a magneticly premable metal to allow the flux to directed moreeasly but i do agree that your basic sheet metal would not be a very good metal to use since most sheet metals have a high thermalexpanssion rate but prefered coating would be a plastic coating to allow for a stronger bond and urethane gets weak as it heats upwhen i built my own turbine i used the magnetics to make a pgm exciter to ensure a consant rotor field then used coiled wire for myrotor the negitive side of this is needing slip rings but using gold wire instead of brushs still allows for high relyablity and low maintancebut as my turbine produces 5k instead of one and operates in a wider range of wind speeds its far complexed and wouldnt suggest thedesign to anyone who doesnt have a back in power generation

 robnsaab says:  Jul 20, 2009. 10:13 PM  REPLYI am really interested in your 5kw generator. Is there any way that you could give me some info on your design. My email isrobert.x.rivera@gmail.com it would really help me out. Thank You.

 sspence says:  Jul 21, 2009. 7:15 AM  REPLYI don't have a 5kw generator. See http://www.green-trust.org for our ebook on building the axial flux.

 ChuckP says:  Jun 24, 2009. 10:34 AM  REPLYThanks for the comment. I am really interested in your 5kw generator. Would you be willing to give me more information about it?If so, my direct email address is candp5777@yahoo.com. I would appreciate it.

 sspence says:  Jun 24, 2009. 9:42 AM  REPLYincorrect. the steel plate completes the lines of flux. magnetic "permeable" would leave a weak field.

 mynumber1 says:  Jun 25, 2009. 10:24 AM (removed by author or community request)

 sspence says:  Jun 25, 2009. 11:34 AM  REPLYIt appeared you were advocating something not iron or steel based. We don't use the term "magnetically permeable" in thealternator industry. Steel works best in this design, which we build and use. Please try to understand this particular designbefore offering "improvements" that will just make this design fail. If you don't like the design, go make your own, writeabout it, and stop hijacking the threads of others.

 mynumber1 says:  Jun 25, 2009. 12:48 PM  REPLYi understand your design prefectly you made a pmg (preminent magnet generator) we use these as exciters forgenerators all the time my comments are simply address because instead of offering alteritives to people askingquestions you tring to sale them things which is completely pointless if you are just tring to help people

 sspence says:  Jun 25, 2009. 2:01 PM  REPLYit's a permanent magnet alternator, and there are no eddy currents in the core, or need for layered insulated metal.if you understand the design, why did you advise how to make coil cores? the questions that keep popping up havebeen answered multiple times. at some point you have to point them to a step by step book (which we don't makeany money on) and a discussion group.

 mynumber1 says:  Jun 29, 2009. 8:22 AM  REPLYdue to the fact that you are creating a voltage the coils of the stator cause a current and creating a magineticfield form the coils creates a generator effect in the plate which creates a large counter electromotive forcelowering the effeictness of the generator limiting its power out put this issue could be can be minimized bylayering but as long a its generating power there will be eddy current loses its impossible to prevent it and infact and alternator is a generator in fact just not a standardly definded generator you seem to think you need todefend yourself with ever i say when in fact you dont im simply offering improvements which would make eventhis design more efficent i design these for a living and im not saying that your design doesnt work simpllyhelping because due to the company i work for i cant post and of my own designs cause all designs i makebecause corpate owned

http://www.instructables.com/id/DIY-1000-watt-wind-turbine/

 sspence says:  Jun 16, 2009. 6:23 AM  REPLYThere is no core in a axial flux alternator, The steel backing plate is for the magnets, not the coils. You need to examine the design beforegiving advice.

 ChuckP says:  Jun 16, 2009. 12:03 PM  REPLYBut isn't it all interrelated? The steel backing affects the magnetic field which affects the fields effect on the coils and subsequent powergeneration?

 sspence says:  Jun 16, 2009. 12:20 PM  REPLYyes, but cogging is caused by iron cores in the coils, and that doesn't exist in this design. It's an "air core" design.

 sspence says:  Jun 4, 2009. 3:20 PM  REPLYit's wild ac, there's no way to synchronise to 60 cycle. thinner than 1/4 steel will not complete the lines of flux.

 ChuckP says:  Jun 4, 2009. 3:55 PM  REPLYI understand. Thanks. BTW, what is the diameter of the steel plate?

 sspence says:  Jun 4, 2009. 4:11 PM  REPLY12". I suggest you get the eBook at http://www.green-trust.org/wordpress/2009/05/07/the-woodhengeorg-green-trustorg-diy-wind-turbine/

It gives very detailed instructions on building the alternator and the blades.

 seandogue says:  Aug 12, 2009. 8:43 AM  REPLYJust wanted to say thank you. it seems like more and more of these instructables are little more than system packaging exercises, andyours, imo, stays true to the idea of DIY inventiveness. As to the on-grid/offgrid issue, seems that one *could add a tracking inverteron the downstream side of your battery packs to connect up? Am I off-target here? In any case,your post is what I would expect to seeat instructables, rather than a cloaked attempt to direct someone to "How to buy my company's wind generator kit" or, uh-oh, anotherinventor is giving away the secret of our not really so secret obfuscated product." thanks for the detail and thought and low-level(closer to the basis) design. refeshing and illuminating.

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