Re: (ET) pollution

["tjwilhelm" <tjwilhelm stelle net>]

Very good point Paul!

To prevent this problem, series-wound DC motors should NEVER be used with a
belt drive.   If the belt breaks, the motor can quickly and easily run 
away.
Series-wound motors are usually direct shaft-coupled to the load.

tjwilhelm

----- Original Message -----
From: "Paul Heinzerling" <pheinzerling uakron edu>
To: "Max Hall" <maxo iname com>; <elec-trak cosmos phy tufts edu>
Sent: Sunday, December 07, 2003 4:39 PM
Subject: Re: (ET) pollution


> In my opinion, "Making Your Own Elec-Trak" does not seem to be off-topic.
> My only contribution to this would be to suggest that you be careful with
> the golf cart motor if it is series-wound.   If you have this type of
motor,
> it has no inherent speed regulation and can spin itself to destruction if
> you run it up without a load.
>
> Regards,
>
> Paul
>
>
> ----- Original Message -----
> From: "Max Hall" <maxmatic comcast net>
> To: <elec-trak cosmos phy tufts edu>
> Sent: Sunday, December 07, 2003 3:26 PM
> Subject: Re: (ET) pollution
>
>
> > My students and I converted a Craftsman riding mower to electric with a
> > 36VDC golf car motor and a Curtis 36-48V 275A PWM. Worked fine! The one
> > thing I would do differently is gear up the linkage between the motor
> output
> > shaft and the rest of the beast. I think the ICE on the original turned
a
> > little faster than the ~2000 rpm that the golfie gave at 36V. One pic
can
> be
> > seen at the bottom of http://www.maxmatic.com/electrak.htm.
> >
> > PS: the thing was a gift to me by a neighbor... when the pushrod came
> > through the side of the engine block. We got the benefit, as students 
> > of
> > EVs, to disassemble a dead ICE. When they compare that to an e-motor,
they
> > can hardly believe the difference in complexity and mess.
> >
> > If you, or anyone else wants details, feel free to email me directly.
> (This
> > is just about off-topic enough to close the thread.)
> >
> > -Max
> >
> >
> > ----- Original Message -----
> > From: "Anton and Federica" <krustyacres earthlink net>
> > To: <elec-trak cosmos phy tufts edu>
> > Sent: Sunday, December 07, 2003 2:24 PM
> > Subject: Re: (ET) pollution
> >
> >
> > >
> > > Yes, of course gas mowers are cheap, and newer ones are definitely
> > > easier get parts for, but I do believe that an ET in the right
situation
> > > is perfect, and has many inherent and synergistic advantages.
> > > I run diesels on vegetable oil, and therefore never go to a gas
station,
> > > and I really hate to make a special trip just to fill up a can of gas
> > > that tends to sit for long periods of time, to be used occasionally 
> > > in
> > > great quantities by the ride on mower. I also have a small enough
piece
> > > of property that I can get to most any spot with an extension cord, 
> > > so
I
> > > don't even run gas chain saws much.
> > > At the moment, I am not able to get an ET easily, since I am on the
west
> > > coast, but I will keep shopping. I also may simply convert my 
> > > existing
> > > ride on to electric, as I have a golf car motor, and could install a
PWM
> > > controller. In all my spare time.
> > > Does anyone on the list have any experience converting a tractor of
any
> > > sort to electric?
> > > I may just buy a diesel one and run it on veg oil, but would prefer
> > > electric.
> > > anton
> > >
> > > Gordon Trump wrote:
> > >
> > > >No disagreement about these concepts from a practical standpoint- I
was
> > > >speaking conceptually. And I certainly realize that my Honda push
lawn
> > mower
> > > >pollutes more than the SULEV Civics running around out there- it is
all
> > > >about money. And as long as lawn equipment is cheap and disposable,
it
> > will
> > > >take legislation (which I don't really favor) to clean up these 
> > > >small
> > > >engines. Even then, they are noisy and vibrate, etc.
> > > >
> > > >That's why we are on this list;-)
> > > >
> > > >
> > > >*snip*
> > > >
> > >
> > >
> > >
> > > _______________________________________________
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> > > Elec-trak cosmos phy tufts edu
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> >
> >
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> >
>
>
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