Instructables

Electric Tricycle

FeaturedContest WinnerContest Winner
With the dramatically increased access to tools and resources that came with going off to college, I wanted to build a second electric vehicle, more refined, more powerful, and more fun than my previous one.  This is the result of my efforts.

This was my first big project at MITERS, the MIT Electronics Research Society, where, for the first time, I have access to real machine tools.  Over the course of this project, I learned how design parts and assemblies in Solidworks, and got fairly proficient at using a manual mill and lathe.  

The basic design for this vehicle came from the classic Radio Flyer tricycle, but this was scratch built with a number of performance increasing enhancements.  It features side-to-side leaning for better cornering,  an incredibly oversized brushless motor, an eight speed manual transmission, and a custom differential, among other things.  It has a  (untested, because I'm not brave enough) top speed somewhere in excess of 40 mph, enough torque to throw off the unprepared rider, and is guaranteed to get you funny looks every time you ride it.

Submitted by MITERS for the Instructables Sponsorship Program

********
For the Make-To-Learn Contest:

What did you make?

In case the title was not clear enough, I made an electric tricycle.  While it may be comically small, don't confuse this for your average pedal-powered Radio Flyer though.  This vehicle was designed solely to be a fun thing to ride, and is more comprable to a go kart than anything else.  Although it is an entirely impractical vehicle for doing anything useful, it has been suggested that I ride it to my classes.

How did you make it?

The idea for building this came from a combination of wanting to build a better electric vehicle than my previous one, and from getting the chance to ride some other very small but very fun electric vehicles.  The parts were first designed in SolidWorks, and then machine manually, using a combination of hand tools, a mill, and a lathe.  Since I designed most of the trike on a computer before building it, I did not have to change any of my designs half way through.

Where did you make it?

I made it at MITERS, MIT's student run shop/hackerspace.  In addition to having the tools I needed, MITERS also has lots of awesome people who know about making a huge variety of different things.  Especially electric vehicles, multicopters, and Tesla coils, though.

What did you learn?

I learned how to CAD in SolidWorks, and how to use a manual mill and lathe.  I also got more familiar with brushless DC motors, and how they are controlled.  Most of the actual building of this project went smoothly, so the biggest challenge was diagnosing some very unusual motor and motor controller problems I had.  It turned out that the motor I used had an intermittent internal short.  Sometimes it would work just fine, which made it very difficult to diagnose exactly what the problem was.

********


 
Remove these adsRemove these ads by Signing Up
Can I purchase this? It looks so much fun :)
rtskone1811 months ago
Can this be done with a small gas engine?
ghmagm rtskone1811 months ago
Im sure it could be done. I think it wouldn't be ideal for riding to class because it would be loud, but most people who make this would probably build it for street pleasure so yes!
mrwolfe1 year ago
Heed Ben's warning about the danger of this step! Batteries contain a surprising amount of energy, and shorting them can be very exciting (but not in a good way!) I would stongly recommend that you use tabbed cells as well. One thing that will severely shorten the life of any cell is heat. Tabbed cells have a solder tab spot welded onto the ends, allowing you to solder them together without getting the ends of the cells hot. Soldering directly to the button on the end of a cell risks overheating - melting the internal support structure - and causing the cell to leak or, if you're really unlucky, short internally - which turns the cell into a heat bomb!
bajablue1 year ago
Fabulous work!!!
bajabot.jpg
gfry1 year ago
Sweet  ibble!  I have been toying with the idea of putting something like this together.  I have a couple 12 volt motors from cordless lawnmowers gathering dust and this seems like the perfect application.  If it comes together I will do an ibble up myself and certainly reference your inspiration.   Cheers.
rickharris1 year ago

Nice engineering - You could do without the diff and just drive one wheel with little loss of traction and a saving in weight and complexity.
ben_k (author)  rickharris1 year ago
Certainly (although the weight savings would be pretty minimal - the differential weights only a couple pounds). The fist thing I say in the "building the differential" step is that there are a bunch of easier alternatives, single wheel drive included.
hertzgamma1 year ago
So cool! Nice work!
Pro

Get More Out of Instructables

Already have an Account?

close

PDF Downloads
As a Pro member, you will gain access to download any Instructable in the PDF format. You also have the ability to customize your PDF download.

Upgrade to Pro today!