Re: [now non-roc]Re: Radiator Fan Question

["Ryan McCarthy" <rmccarthy777@email.msn.com>]

Regenerative braking does not charge a battery. I'm an electric forklift
mechanic and a great majority of the machinery I work on uses regenerative
braking. What it actually does is just return what has already been taken.
Regen braking actually works when you apply a reverse polarity to the motor
in order to slow the vehicle. Now, when you do that, there's a bunch of
energy basically that has nothing to do, nowhere to go. If left with no
where to go, it turns into heat. The regen redirects this energy back into
the battery so as not to toast your motor and electronic devices. There is
no charging taking place.  They do, however, use a diode setup that actually
can allow an electric motor to produce some of it's own energy. But, again,
this just lessens the load on the battery, it does not produce any gains in
charge.

Sorry, school's over...

Ryan M



>
> Current EV technology is exploiting regenerative braking.  The drive
> motors, when enagegd will generate electricity to charge the onboard
> batteries as the vehicle is slowing down.  The increased load of the
> motor-generators serves as a brake for the vehicle.  I believe that
> Toyota's current hybrid uses this technology, and perhaps GM's next
> generation EV as well?
>
> I'm surprised that there would be any noticeable gain from a fan driven
> gnerator.  Any power from the fan would come at the expensive of more
> battery energy to the wheels to overcome the increased drag.  One of those
> fundamental laws of physics teaches us something about this, I believe...
> :)  I'm not sure I'd reccommend financing this guy's idea... :)
>
> Drew
>
> On Thu, 9 Mar 2000, Ewan Hopkins wrote:
>
> > This reminds me of a news item I saw recently where a guy in Scotland
has
> > supposedly developed a system for an electric car which is basically a
fan
> > generator in the engine bay, hooked-up to the car's battery cells.  He
> > reckons that, above 30-40mph, the generator produces enough electricity
to
> > usefully extend the range of the car. He's installed a prototype into a
> > Honda electric car and he's apparently trying to get together the
funding to
> > exploit this idea commercially.
> >
> >
> > Ewan Hopkins...
> >
> > '85 Storm 2.0
> > '86 GT 1.8
> >
> >
> > >From: "Chris DeLong" <green536@hotmail.com>
> > >To: tberk@mindspring.com, e@sbbs.se
> > >CC: scirocco-l@scirocco.org
> > >Subject: Re: Radiator Fan Question
> > >Date: Wed, 08 Mar 2000 23:21:28 PST
> > >
> > >
> > >>
> > >>Here's the follow up question;
> > >>
> > >>At high speed does the fan's freewheeling actually create energy
> > >>output back into the 12 volt system?
> > >
> > >Unfortunately it would only do this if you had the fan switch bypassed
;)
> > >
> > >>
> > >
> > >
> > >Chris DeLong
> > >ICQ#45030867
> > >Seattle, WA USA
> > >'80 16V Rag
> > >'80 Rocco (new!)
> > >'65 Bus (ugly, but good for campin' W/toaster oven)
> > >'82 GLI (now with a happy shaved, solenoid operated trunk)
> > >'80 'Vert
> > >'61 17 Window
> > >'78 Scirocco
> > >
> > >
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>
> Drew MacPherson, Network Analyst, University of Guelph
>
> drew@dyermaker.cs.uoguelph.ca           |  visit the Massey-Harris page:
> http://dyermaker.cs.uoguelph.ca/~drew   |  http://m-h.cs.uoguelph.ca
>
>
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