Mini - Wind Turbine

by larsonmattr, published

Mini - Wind Turbine by larsonmattr Nov 27, 2010

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This is a three blade wind turbine. Just connect to a small motor and you can get up to around 1.4 volts in a good wind current. It can double as a miniature fan, if you connect the motor up to a battery instead. This is my first finished design for Thingiverse!


There are two parts to be printed, blades and a holder hub. The blades print vertically, as does the hub. You have to print 3 blades for this project. After printing, the blades snuggly fit into the holder hub (and could be glued for a stronger finish). The .stl files should be ready to print for a Makerbot. I found that on mine, rotating the orientation of the blades can affect how they turn out, because of where skeinforge starts and stops extruding for each layer, so I have them turned as best printed from mine using skeinforge 7.

I designed it all using OpenSCAD. The nice thing with the blades is that I have created a bunch of variables that users can modify - so you can take my .scad file, and easily tweak the blades to be: longer or shorter, more/less curved, thicker and thinner, and wider/sleeker. Then just recompile and print! This uses a .dxf file created from Inkscape to provide the general blade shape and uses the linear_extrude function to convert the 2d representation of the blade into a 3d shape. Quite fun.

To make .dxf files from .svg files, use pstoedit. I've included my makefile to show how this works. (1)

1: http://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Other_2D_formats

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what king of motor do you used for product the electricity ? because i don't understand how is it possible to supply energy with a simple DC motor, is it not make for that ? thanks :)

I'm curious, what could you use that for?

Having won a competition for my basic wind turbine design based off some simple valuations I'm curious as to how you got that form. What's the catchment area and rated wind velocity?

Having won a competition for my basic wind turbine design based off some simple valuations I'm curious as to how you got that form. What's the catchment area and rated wind velocity?

When I open the scad file for the blade, only the base shows up and not the blade. PLEASE HELP

When I open the scad file for the blade, only the base shows up and not the blade. PLEASE HELP

Comments deleted.

What type of little motor did you use to get 1.4v, and was a hurricane blowing lol? I just have a little tiny motor that even when it's hand spun only generates about 500mV. I was also going to incorporate a spur and pinion gear to hopefully improve the rate the motor spins at.

Is it possible to take diffrent cross sections from this site? http://aerospace.illinois.edu/m-selig/ads/coord_database.htmlhttp://aerospace.illinois.edu/...
Im new to this and learning for my project work in school.

There are .dxf files are available on the page that you could try, the other archives you would have to convert into .dxf format. And you will have to be able to view your .dxf files to make sure the scale and origin of the cross sections is similar to what was used in this model.

Hi im sorry to bother you but i dident find any dfx files only dat and i found a program called profili but the airfolis dosent work could you please help me with 2 more diffret cross sections i would really appreciate it

How do i change the cross section? i want to make 3 diffret blades with diffrent curves i dont get it how to change it in open scad it would be alot easier in solidworks

See comment above for how to make new cross section.

Hi i want to change the cross section to get other curves what do i have to change to get what i want?

Thanks for the OpenSCAD model. My physics students were able to quickly create new designs to try to find an optimal wind turbine.

you will get more current if you shorten the blades because its about RPM and the long blade tips are moving faster than the hub and fighting against it. Typically, there is an increase in the angle of attack to compensate for this. But Generally, I think the fan is too big. I used a small 1.5 inch computer fan and generated over 5 volts (with hobby motor) in a 20 mph wind.

omg win! this is awesome, thank you!

it would be cool of the holder had a captive nut grub screw like the nophead version of wades gear

like http://www.thingiverse.com/thing:2521http://www.thingiverse.com/thi...

other than that this is a cool print that I have wanted to do since I got my makerbot


Gear with setscrew for Wade's extruder
by nophead

I was amazed that you had already printed this so quickly!

best wishes - matt

I've wanted to design this for a while so when I saw you had already done it I had to print it ASAP

Thanks again for the design


Just need to scale it up a bit... :-P

Just need a bigger printer ;)