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24 Volt Stator - Heavy Duty

DUE TO A BACKLOG OF ORDERS, WE ARE NOT CURRENTLY ACCEPTING ORDERS FOR THIS ITEM. Please Email us for more information on when this product will be available again.
3 Phase Stator for Axial Flux Wind Turbine project

We offer this for those folks who want to build their own wind turbine but don't care to wind their coils or cast the stator, or for some perhaps this could serve as a replacement part.

This is our 'heavy duty' stator - and it required that you use the 2" diameter x 1/2" thick disc magnets. You might choose this one if you live in a very windy place or you want to furl out in higher wind speeds, or if your tower is at a great distance from the batteries.

This stator is wound with 2 strands of #15 gage wire. It has 9 coils and each coil has 55 turns in it. We use the same high grade 200 deg C magnet wire in these that we sell on the website. The coils are wired in 3 phase star configuration. They are cast in a mixture of vinyl ester and ATH (Aluminum trihydroxide)

The stator is 1/2 inch thick and 15.5 inches in diameter. The hole in the center is 5.75 inches in diameter. We do not drill out any holes for mounting but if youd like it drilled out to fit our stator bracket send us a note with your order and we'll do that. This stator fits machines that use magnets 2 inches tall (or diameter) fit to 12 inch diameter rotors. It's a perfect fit for the machines on our website at It would work well with the older brake disc designs (so long as the brake disks are 12 inches in diameter) or our more recent ideas featured here:

With some slight changes to the mounting brackets and the use of larger magnets, this stator would also work well with the 10 foot diameter machine featured in Hugh Piggotts plans 'How to build a Wind Turbine'.

We offer several different stators here so be sure this is suits your needs best. If you have any questions feel free to email us before you order.

This particular stator is well suited for a 24 volt system. The magnet rotors should be 12 inches in diameter and each rotor should have 12 of the 2 inch diameter by half inch thick N40 or N42 grade NdFeB disc magnets installed. After you rectify the output to direct current, this stator should produce 24 Volts at 140 rpm. The blades should be 10 foot in diameter.

This stator has much lower resistance than our other 24 Volt stator. It must be used with the larger disc magnets. With that setup it will overpower your blades and they may stall in higher winds, depending on your battery voltage and the losses in the line. (at 12 Volts this arrangment usually works out well especially if there's significant distance between the wind turbine and the batteries). To make this work, you may need to add resistance elsewhere in the system. If you have questions about this let us know. The idea behind this heavy duty stator is to generate less heat in the stator so the machine can produce higher power for longer periods of time.

Pictured above is the power curve for an alternator built with this stator vs our other stators. The yellow line is the heavy duty stator, the red one is our normal stator. This graph is NOT intended to imply more power coming out than going in, that part of the curve shows the possible stalling that you may have to adjust for (above). That alternator has an airgap of .7 inches (the airgap is the distance between magnet rotors), 12 inch rotors, and a total of 24 2 inch by half inch N40 NdFeB disc magnets.

Again, this stator will require that you add resistance to the line in order to match the load to the blades. While this stator costs the same as the others, do realize that the project overall will require more expensive magnets and a resistor in the line (it may need to be a resistor that can dissipate at least 500 Watts without overheating). Don't buy this unless you have an understanding about how this all works. In our tests we believe this stator will be about 50% efficient at 1000 Watts. Sustained output above about 1000 Watts may overheat this stator so you should design your machine to furl before that point.

We do not drill any mounting holes in the stator. We figure folks might want to drill it out to suit their own frame work. If you would like us to drill this out so it fits the stator bracket in our metal work kits (see other products) just send us a note with the order and well do it for you!

We make these stators in our shop, which is located in the mountains of Colorado off the power grid. We are totally powered by homebrew wind power. These stators are hand made and cast in fairly primitive wooden molds. Sometimes we get air bubbles in the casting. If they are real ugly we fill them, but otherwise they are just a cosmetic defect. So please dont expect cosmetic perfection - were working on it but were not there yet!

We make these to order. We may not be able to ship stators for 2 weeks after your order so please keep that in mind! (most of the time were faster)

DUE TO A BACKLOG OF ORDERS, WE ARE NOT CURRENTLY ACCEPTING ORDERS FOR THIS ITEM. Please Email us for more information on when this product will be available again.

Current Reviews: 3
This product was added to our catalog on Friday 23 November, 2007.
Jan 1st 2012 - Due to the acquisition of Forcefield by Amazing Magnets, we have temporarily disabled purchasing on the shopping cart. For immediate needs for magnets please visit For wind power products visit
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