Re: [Amc-list] ELECTRO-RAMBLER =revisited=

[Wrambler242@xxxxxxxxxxx]

I stumbled on the website that the guy has who built the 4X4 XJ EV. Url is at work. Google should be able to find it, try EV Jeep or somethignt o that effect.
  Anyway, he says that electric DC motors get the best "economy" by running at their rated rpm. So being as the rating on most DC motors commonly used is 3600rpm, well, that would mean OD units are a waste of time. 
   So saying one wanted to run the EV on the interstate at a max speed of 78mph then one should gear it run 3600 rpm at 78 mph.  Driving the vehicle in town, say with a stick, You could then pick the gear to get the motor at or near the 3600 rpm spot again. 
   If you think about it lugging an electric causes a need to increase the amperage to maintain rpm.
   So a 4 speed non OD trans would in fact be a fairly good tool to allow one to be able to keep the motor at the "sweet" spot.
   I want one to play with. I don't know that this urge will die quietly! If I can just get my shoulder to calm down and let me get some work done!!!
   Tomorrow will see the boat in the lake, One more project down.

--
Mark Price
Morgantown, WV
1969 AMC Rambler, 4.0L, EFI, T-5

 -------------- Original message ----------------------
From: farna@xxxxxxx
> In theory, yes -- hook it right to the driveshaft or axle. But in practice, you 
> need a hefty motor to get something heavy moving. So there's a compromise 
> between motor size/weight/heat generated, and the current draw required. Seems 
> it's better in the long run to use a transmission -- at least a two speed job as 
> Andrew keeps mentioning. That's why I figure a BW OD would be a good, light, 
> easy to operate trans. That's only if you can electrically reverse the motor 
> though. And have an electric lock-oout for the OD, which won't work in reverse. 
> That's easy enough to accomplish with a relay to cut power to the solenoid. 
> Since multi speed automotive trannys are readily available and easy to use, may 
> as well use a smaller motor and take advantage of all the gear reduction already 
> there. 
> 
> ------------------------
> Date: Wed,  2 May 2007 18:21:39 -0600
> From: Ken Ames <ameskg@xxxxxxxxx>
> 
> Aren't electric motors like steam engines? Maximun torque at 0 rpm?
> Should be able to run the driveshaft off the motor. The electric buses here have
> no tranny.
> 
> --
> Frank Swygert
> Publisher, "American Motors Cars" 
> Magazine (AMC)
> For all AMC enthusiasts
> http://farna.home.att.net/AMC.html
> (free download available!)
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