[LINK] Standards, please! The third coming of electric vehicles

[Karl Auer]

On Sun, 2012-04-22 at 10:09 +1000, David Boxall wrote:
> On 22/04/2012 2:02 AM, Frank O'Connor wrote:
> > - Why not install multiple smaller engines in an electric car?
> > - Why not install them in the wheels?
> ...
> A small matter of physics. That arrangement might work at very low 
> speeds and/or on extremely smooth roads. The problem comes when you hit 
> a bump.

Something we agree on! Multiple motors - yes, maybe. In the wheels,
nope.

> Adding a motor increases the weight of the wheel. Vehicles employing 
> so-called wheel-motors have been made (might still be in production), 
> but none give a very comfortable ride, particularly at speeds above 
> walking pace.

They work well in unsprung and/or slow vehicles (electric bikes, for
example). Otherwise, nope.

> characteristics. Unfortunately, the necessary axles and constant 
> velocity joints add to costs

Multiple electric motors can be governed by software of course, meaning
that no diff is needed, but as far as I know noone is actually designing
cars like that - yet :-)

Regards, K.


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Karl Auer (kauer at biplane.com.au)
http://www.biplane.com.au/kauer

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