Alternator Becomes Motor for This Electric Go-kart

Growing up in the 70s and 80s, a go-kart was a quick ticket to coolness, second maybe to a mini-bike. In both cases, a welded steel tube frame and a cast-off lawnmower engine were all that stood between you and neighborhood glory. Looks like a couple of engineering students caught the retro juvenile delinquent bug and built this electric go-kart for their final project.

While the frame for [Adrian Georgescu] and [Masoud Johnson]’s build was a second-hand find, the powertrain is all custom. They targeted a power output of 3 kW but found no affordable motors in that range. So, in true hacker fashion, they rolled their own motor from a used Subaru alternator. The three-phase motor controller came from an electric scooter, three LiPo packs provide the juice, and a pair of Arduinos takes care of throttle control, speed sensing, and sending data to the virtual dashboard on an Android phone. Some lights and a snappy red and black paint job finished off the build. While the video below shows that the acceleration isn’t exactly neck-snapping in the Tesla style, the e-kart can build up to a good speed – 53 km/h. Not too shabby, and no deafening engine right behind your head.

If you’ve got the e-kart bug, best check out some of our previous posts, like this kart built from off-the-shelf components, or this four-wheel-drive mini-kart. Any way you build it, you’ll rule the cul-de-sac.

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Electric “Microkart” Has Tons of Kick

Go Kart with Independent Suspension

When you’re building an electric go kart, you really have two options. Convert a normal gasoline powered one by swapping out the power plant… Or build it from scratch! [Ganharr] opted for the for the latter to save some money, and to design it just the way he wanted.

Now you may have noticed it looks a bit small — because it is. It’s really more of a Micro-Kart, but that’s okay because [Ganharr] is winning a father-of-the-year award for building it for his kid!

It features two 2kW (~3HP) brushless electric motors, which independently drive the rear wheels. These are powered by two 48V 50A continuous (100A peak) speed controllers.[Ganharr] also spared no expense on the batteries, opting for a 48V lithium-ion pack composed of Headway cells (3.2V 15aH capacity each, 40152 type).  Continue reading “Electric “Microkart” Has Tons of Kick”

Introducing the Flux Buggy — A Serious Electric Dune Buggy Conversion

Believe it or not, the writers here at Hack a Day do their own projects too, we don’t just write about yours! I’ve just started a new project, and I want your advice! A few friends and I are converting a custom-made dune buggy — to electric.

The project will be chronicled over on, with (hopefully) weekly updates on our progress. If you’ve been perusing Projects, you may have noticed my Electric Car conversion from a few years ago. First year of my engineering degree, my friend and I converted a 1993 Honda Del Sol to electric, using the guts of an electric forklift.

We got it going over 100km/h on used batteries our school donated to us. Unfortunately, there was a bit too much red tape and bureaucracy for us to get it on the road legally. That and we were poor university students who couldn’t afford new batteries, or the ridiculous amount insurance companies wanted to put it on the road. The project got scrapped after sitting in the backyard for a few years.

Fast forward to today, and we’ve both graduated and are working our “cushy” engineering jobs, and for the first time in our lives, we have some disposable income. We needed a new project to work on.

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Electric Go-Kart Made From Off The Shelf Components

Eletctric go kart
What would you do with a catalog of parts and a nice budget? [Ben Rothschild] decided to build an electric go-kart from scratch, for a contest he’s trying to win.

He designed the entire go-kart in 3D CAD using off the shelf components to speed up assembly. The frame is made of aluminum extrusion with t-bolt brackets, and he’s using modified FIRST Robotics wheels with standard #25 chain and sprockets.

Two 1850W Turnigy SK3 brushless motors make up the drive system, equivalent to almost a 5HP engine — except with a constant torque profile, meaning it’ll have no problem going up hills at 3km/h or 30km/h, no gearing necessary! To power the beast he’s using four hard-shell LiPo batteries (4S1P), which are rated for 14.8V and 5Ah. Two el cheap-o 24V 500W speed controllers (slightly concerning) provide the control system, which he may plan to upgrade in the near future.

The test drive video is a bit short, but it looks like with a bit more work this go-kart could have a lot of potential!

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