Re: (ET) Conversion to Fet Motor controller?

[Kirkvg aol com]

In a message dated 3/27/01 7:07:22 PM Pacific Standard Time, paulc snet 
net 
writes:

<< 
 I have had a E-20 now for about 5 years and I really enjoy the tractor.
 What I would like to do is hear from anyone that has done a conversion to 
a
 FET bases
 speed controller for the traction motor.

 >> Paul, I converted my E-20 to a 275 amp Curtis controller last summer. 
 >> I 
used the controller on the armature circuit and I built a simple 
transistor 
circuit to control the field current. You probably wouldn't want to 
connect 
the field to the armature as that would limit the motor speed to a fairly 
low 
rpm. I have a wiring diagram of the conversion that I would be happy to 
send 
you if you send me a SASE to Kirk VanGelder, 22308 NE 68th ST, Vancouver, 
WA 
98682

<< I think I could handle the circuitry conversion but I sure there would 
also
 be some pitfalls.
 Which controller was used?   What did you do with the field winding?  Tie 
to
 the 36 VDC.
 
 As far as current is concerned I once did a test using a 1000 Amp Shunt 
and
 found there to be
 around 330 amps of locked rotor current so with this in mind I have an 
idea
 as to what size controller.
 This was with new Trojan 220 bats.
 
 Would like to hear from others.  Please post to the list. >>