Dantheman
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| posted on 10/6/07 at 01:58 PM |
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Electric Atom
I've been struck with the idea of building an electric powered Atom style car! I have no idea where to begin though really, such as sourcing a
suitable motor, batteries etc etc. But I just thought I'd share it with you and see what you think. Does anyone know where I could get more info
on building electric cars?
I'm not doing this because I'm worried about my "carbon footprint" or to be all green, I just thought it would be something
differant.
Danny.
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smart51
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| posted on 10/6/07 at 02:32 PM |
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I've been thinking about an electric car too. There is an electric car builder forum but it almost never gets posts.
There are no good donors to get motors from. The G-Wiz / REVA is only 17.5 BHP. Automotive motors are much lighter than industrial ones but are much
rarer. This is partly beacuse industrial motors are sized to run at 1500 or 3000 RPM. Run them at 8000 RPM in a car and the same sized motor makes 3
- 5 times the power for the same weight.
Car motor controllers are also thin on the ground. It would make for an easier SVA though, with no worries about emissions or noise.
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Dantheman
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| posted on 10/6/07 at 02:41 PM |
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I'm quickly coming to the conclusion that this is not a very practical idea...
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CraigJ
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| posted on 10/6/07 at 02:46 PM |
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isnt there a video of an electric atom on youtube?
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goodall
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| posted on 10/6/07 at 03:07 PM |
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a good source of gel type lead acid batteries is "used" batteries from large ups units. they only ever get used for about 2 cycles in
there life. can be got for next to nothing since theres no market besides to the battery re-manufacturers.
there might be lighter alternatives to gel type lead acid but theres a certainly the cheapest
iv been thinking of the idea of getting an old awd car, pulling the gearbox out fitting the 2wd version and then power the back axle by a electric
motor, ideal for standing traffic and up to about 5 mph, then use the petrol engine for higher speed
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nitram38
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| posted on 10/6/07 at 03:08 PM |
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Been done already
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Fatgadget
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| posted on 10/6/07 at 03:13 PM |
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Loads of info about EVs here
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tegwin
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| posted on 10/6/07 at 04:27 PM |
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You need a threephase motor and lithium cells.... to get the maximum amount of torque for the least weight
And as for the electronic controller....Its not a particularly complex system...go the locost route and make one
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speedyxjs
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| posted on 10/6/07 at 04:36 PM |
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If you want to make an electric car, get all the info you can on the electric se7en 
How long can i resist the temptation to drop a V8 in?
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StevieB
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| posted on 10/6/07 at 05:27 PM |
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There was a Dutch company who built an electric Indy - they featured in a kit mag a year or so ago.
I can't remember the name, but I remember the article stated that MK were in contact and could supply the running gear - I remember because the
performance was, well, electric and I thought about building a leccy indy myself.
Bit of a problem for going touring though 
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kb58
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| posted on 10/6/07 at 05:31 PM |
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tegwin wrotequote:
And as for the electronic controller....Its not a particularly complex system...go the locost route and make one
I can only guess you specialize in power electronics and/or are joking. It's far from easy to make your own. In fact it can be downright
dangerous and burn everything to the ground. You think everyone knows about Rds and shoot-through? Hahahahaha.
[Edited on 6/10/07 by kb58]
Mid-engine Locost - http://www.midlana.com
And the book - http://www.lulu.com/shop/kurt-bilinski/midlana/paperback/product-21330662.html
Kimini - a tube-frame, carbon shell, Honda Prelude VTEC mid-engine Mini: http://www.kimini.com
And its book -
http://www.lulu.com/shop/kurt-bilinski/kimini-how-to-design-and-build-a-mid-engine-sports-car-from-scratch/paperback/product-4858803.html
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smart51
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| posted on 10/6/07 at 07:04 PM |
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quote:
Originally posted by kb58
quote:
And as for the electronic controller....Its not a particularly complex system...go the locost route and make one
I can only guess you specialize in power electronics and/or are joking. It's far from easy to make your own. In fact it can be downright
dangerous and burn everything to the ground. You think everyone knows about Rds and shoot-through? Hahahahaha.
I have a degree in electronics engineering and work for a company that makes a 3 phase electric motor controller as part of their electric steering
product. I'd be nervous of building my own with a 300 or 400V battery pack. I bet I could do it but I bet I've be scared to put my
fingers near it.
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Bob C
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| posted on 10/6/07 at 07:34 PM |
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I will do the electric kitten in the fullness of time..... It won't be a performance car though!
Motor - am using an idustrial TEFC induction motor, but getting it rewound, to use lower voltage.
Inverters is what I do for a living - so yes I'll be making my own,
It's a BIG job, apart from the drive electronics there are a stack of power converters required - battery charger (with power factor
correction), fully isolated. 12V auxiliary converter for all the car stuff (horn, lights, wipers etc).
The motor & inverter will be liquid cooled using the heater matrix & probably diesel as the fluid.
New off the shelf items that the high performance guys are using is ruinously expensive & the PM synchronous motors have interesting safety issues
when run in field weakening (high speed). And no way can I afford anything but lead acid caravan batteries!
I'll keep updating my website as and when I do stuff.
Bob
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Mal
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| posted on 10/6/07 at 07:34 PM |
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I saw the electric MK at a show and it was obvious that a lot of know-how about electronic thyristor motor drive systems and software was used. It was
difficult to assess the costs involved, but I doubt it was cheap.
About 5 years ago a Tiger with electric drive featured on the front cover of Which Kit, or the other one.
Mal
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RazMan
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| posted on 10/6/07 at 08:56 PM |
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Here's an interesting link showing some more info on electric
sports cars - the Tesla is my favourite, followed by the Fetish.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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smart51
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| posted on 10/6/07 at 09:20 PM |
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quote:
Originally posted by Bob C
The motor & inverter will be liquid cooled using the heater matrix & probably diesel as the fluid.
Hot diesel and high voltage electricity. And some say water and electricity don't mix.
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Bob C
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| posted on 10/6/07 at 10:10 PM |
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. And some say water and electricity don't mix..
that's why I'm not using water....
seriously there's enough volts to electrolyse water - & I don't plan to install a de-ionising plant!!!!
You can light diesel easily enough if you have a wick. otherwise it's quite hard....
Bob
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MikeRJ
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| posted on 10/6/07 at 10:18 PM |
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quote:
Originally posted by Bob C
The motor & inverter will be liquid cooled using the heater matrix & probably diesel as the fluid.
Would transformer oil not be more suitable?
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Bob C
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| posted on 11/6/07 at 08:48 AM |
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Good point Mike - Diesel has 2 advantages, easy, cheap supply & compatibility with seals etc in automotive stuff - once you go more exotic
it's hard to get compatibility data/guarantees. But the transformer stuff would undoubtedly be better electrically
Bob
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