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Re: (ET) Electric Tractor Conversion Update



Meant half the range due to 2 motor's combined inefficiencies, extra
weight for starting inertia and hills, drive train losses (Etracks have
very little, hydrostats have a lot more).  Shoulda expanded on that.

Weight distribution will also be a problem. Will have to work it out
close to what that grasshopper started at.  The GE design is essentially
a well balanced box full of heavy batteries and stuff and they did a
splendid job of  it.

Dave
Weymouth MA

 

On Wed, 22 Nov 2006 07:47:04 -0500 "Matthew callahan"
<callahanrc hotmail com> writes:
> Just because it has two motors doesn't necessarily mean that the 
> mower will 
> have half the range.  The motors would just share the current that 
> is needed 
> to move it in any direction.  IE half-half current to each motor to 
> go 
> forward, full/zero to turn right, zero/full to turn left, or such.
> 
> However, added weight is defintely a concern with gas tractors for 
> those 
> were not originally designed to carry 350# in batteries, but I 
> imagine that 
> they had some good amount of safety factor built in because of the 
> rough 
> terrian they work on.  Meanwhile work off those McDonalds 
> cheeseburgers and 
> contribute less to the rider weight factor while you're at it :)
> 
> Matt
> 
> 
> >From: David C Robie <mycroftxx1 juno com>
> >To: metman glasgow-ky com,elec-trak cosmos phy tufts edu
> >Subject: Re: (ET) Electric Tractor Conversion Update
> >Date: Tue, 21 Nov 2006 20:17:47 -0500
> >
> >
> >This thing is going to be heavy (due to battery weight and second
> >Emotor).   You'll have to deal with that.  By makin her heavier.
> >Reinforcements etc.
> >
> >Also - due to the 2 motors (rather than one in an Etrack) she will 
> get
> >half the range of an Etrak (figuring same battery AH capacity)
> >
> >We figure these Etractors at 15 HP equivalent.  (The guys that do 
> tractor
> >pulling are puling against that range of tractor and doing well)  
> One
> >motor running at a constant speed (TBD by experiment) running a 
> pump
> >would do it HP wise if your joystick for turning is 'proportional'
> >delivery from pump  to both the wheel motors.
> >
> >What will drive the deck?  Is it hydraulic? (another motor 
> needed??)
> >
> >
> >Dave
> >
> >Weymouth MA
> >
> >
> >
> >On Tue, 21 Nov 2006 08:07:22 -0600 "Mike Wallace" 
> <metman glasgow-ky com>
> >writes:
> > > Geof and all,
> > >
> > > Speaking of converting from ICE to electric, I could use some 
> advice
> > > and/or tips on doing something similar myself.  Ever since I met
> > > Shawn Lawless last year at the Louisville Lawn Expo and saw his 
> ZTR,
> > > I've wanted to try something similar.
> > >
> > > I recently bought an older (late 80's maybe) Model 411 
> Grasshopper
> > > with intentions of converting it.  It currently uses an 11 hp 
> Briggs
> > > (horizontal shaft) driving two Eaton hydro units that then drive 
> the
> > > wheels through 13:1 double chain reduction systems.
> > >
> > > I'm thinking about using two E15 drive motors and two Alltarx 
> units
> > > to drive them.  Without a lot of major changes, I think I can
> > > position the two drive motors parallel to each other with one
> > > pointing east and the other pointing west.  I'll mount the 
> smallest
> > > possible #40 sprockets to the output of each motor to drive the
> > > first 4:1 reduction.
> > >
> > > One possible problem I'm wondering about is that one motor will 
> be
> > > turning it's normal "optimum" direction and the other will be
> > > essentially running in reverse while the mower is going forward.
> > > And visa versa for when backing up.
> > >
> > > Do I need to consider modifying the brush position/location or 
> even
> > > possibly the field winding connections such that when going the
> > > predominate forward direction, both motors are in "optimum"
> > > direction mode?
> > >
> > > With the Briggs engine gone, (this is a front mounted deck
> > > Grasshopper with the single tail caster wheel) I figure there 
> ought
> > > to be plenty of room to finally do something with those 60+ Saft
> > > BB-600 NiCads I've had for about a year now.
> > >
> > > I figure I'll replace the current shaft driven 36" deck with a 
> 42"
> > > ET deck and that swap shouldn't be a big deal.
> > >
> > > Any of you guys got any suggestions or words of wisdom for me?
> > >
> > > Mike in KY
> > >
> > > ----- Original Message -----
> > >   From: ThompsonG DFO-MPO GC CA
> > >   To: elec-trak cosmos phy tufts edu
> > >   Sent: Tuesday, November 21, 2006 6:38 AM
> > >   Subject: (ET) Electric Tractor Conversion Update
> > >
> > >
> > >   Hello All
> > >
> > >
> > >
> > >   www.electriclawntractor.com
> > >
> > >
> > >
> > >   Edmonds Electric says the Electric Conversion Kids will be 
> ready
> > > early 2007 at $2000, (not sure if that Canadian or American).. I
> > > also noticed a 36V to 120AC solid sate inverter.
> > >
> > >
> > >
> > >   I've got a nice little Cub Cadet just waiting for a 
> transplant.
> > >
> > >
> > >
> > >   Geof Thompson
> > >
> > >   A-60,
> > >
> > >   E-81,
> > >
> > >   ER8-36,
> > >
> > >   R-36
> > >
> > >   E-8,
> > >
> > >   E-10x2,
> > >
> > >   E-12M,
> > >
> > >   E-12,
> > >
> > >   E15x2,
> > >
> > >   E-20x2,
> > >
> > >   B-145X2,
> > >
> > >   C-185,
> > >
> > >   E-141X2.
> > >
> > >   I-5
> > >
> > >   (21)
> > >
> > >
> > >
> > >
> > >
> > >
>
>------------------------------------------------------------------------
-
> >-----
> > >
> > >
> > >   _______________________________________________
> > >   Elec-trak mailing list
> > >   Elec-trak cosmos phy tufts edu
> > >   https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak
> >
> >
> >_______________________________________________
> >Elec-trak mailing list
> >Elec-trak cosmos phy tufts edu
> >https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak
> 
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