(ET) Fwd: RE: Electric Tractor Conversion Update

[Tim Humphrey <hump evgrin com>]

I would advise not using a snowthrower motor for the deck, use a drive 
motor instead. The snowthrower motor is a full blown series wound motor, 
it's speed will be all over the place with differing loads. The drive 
motors being either permmag or primarily shunt-wound are more of a 
constant speed motor.  I'd prefer the E14 or E12 permmag motor for the 
deck.  No controls needed, just a contactor for each motor.

Stay Charged!

Hump


Jerry wrote:


I beleve R Klien, Hump an others have the right idea, replace the 11hp ICE 
with a 14, 15, 20 hp Etrack motor. I did a Cub 149 an few years back, no 
controlls needed, it was a shaft drive hydro so the dc motor ran at full 
rpms all the time, all controll was thur the trany ..fwd/rev/speed, I 
would switch out the decks for a frt mount elec deck, or add a snowblower 
motor to drive the present deck, worked fine for me
 
Jerry NW Ohio
----- Original Message ----- 
From: Klein Robert W NPRI 
To: 'Mike Finck' ; elec-trak cosmos phy tufts edu ; ThompsonG DFO-MPO GC 
CA ; metman glasgow-ky com 
Sent: Tuesday, November 21, 2006 9:41 AM
Subject: Re: (ET) Electric Tractor Conversion Update


Why not just use one motor to drive the existing hydraulics and leave 
everything else alone?  The hydro would run at a constant RPM and the 
speed control would be by stock shuttle valves.
 
 
Robert W. Klein II
SSGN Deputy Technical Manager AWS/AWSS
1176 Howell Street
Newport, RI 02841
Phone: 401-832-1948
Toll Free:  1-800-669-6892 Ext. 21948
FAX:  401-832-7877
e-Mail: kleinrw npt nuwc navy mil
-----Original Message-----
From: elec-trak-bounces cosmos phy tufts edu [mailto:elec-trak-bounces 
cosmos phy tufts edu] On Behalf Of Mike Finck
Sent: Tuesday, November 21, 2006 9:43 AM
To: elec-trak cosmos phy tufts edu; ThompsonG DFO-MPO GC CA; metman 
glasgow-ky com
Subject: Re: (ET) Electric Tractor Conversion Update


I'm surprised 11 hp could power the hydros and the deck.
  With the mass of the front deck having to be swung in order to make 
180's the tires have to grip well.  With steering levers with say 6" of 
travel one can "feather" the power to the drive wheels until the inertia 
of the deck mass is overcome and then the 180 turn (without excessive tire 
spin) can occur.  Can there be enough "feel" in the Alltrax?  How do you 
plan to translate your control (ie levers?) to the Alltrax?  I like the 
concept a lot.  I have mowed with Dixon ZTR's for 30 years, there is no 
more efficient way to move around a yard, "feel" is important when 
operating a ZTR.


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