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Re: (ET) Does anyone have the E-15 and E-20 traction motors electrical specs ?

So if i read you right, sending a possible 45 amps to the field seems WAY 
out of spec and i would be concerned.
I'm trying to think: Without raising the pack voltage would it ever be possible to put more current into the field? Also it would just make the field stronger with respect to the motor and slow it down even more.
The usual danger is with the opposite direction: If the field is too weak then the armature can draw too much current and blow up the motor. Thus why we have the relay that drops the field resistors out (and puts it back at full power) in the event the armature current gets too high. Then that plus the in-series field in the motor going up should slow the motor down. 

C



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Message: 1
Date: Thu, 15 Dec 2022 15:34:08 -0500
From: john <johnreinhard rochester rr com>
To: elec-trak cosmos phy tufts edu
Subject: (ET) Does anyone have the E-15 and E-20 traction motors
         electrical specs ? Planning Sepex conversion
Message-ID: <e5074c0c-c144-cc10-06c4-dd5dd83a1751 rochester rr com>
Content-Type: text/plain; charset=UTF-8; format=flowed

Hi all,

I am planning to install a Curtis 1266A SepEx controller into an E-15.

  From what I have read, I need the motor specs which describe Armature
current versus field current, to define and program in a field map.

When I searched Google for this, a long ago (2004) discussion popped up
where Steve Richardson @ Alltrax asked for same thing to program into
their controller being designed for the Elec-Trak.

They DID get a reply from Mike Wallace in KY.

Someone also asked that these specs get posted more publicly, but if
that happened, I did not find them.

Does anyone have this motor info? ?

[Also, anyone have any idea what the parts are inside the custom
labelled TO-220? devices inside a Curtis 1266A ?? I have a shorted one
(TO-220), and the marked number does not pop up on Google.? I assume it
is a 100 Volt (min) High Current FET.? All the gates get fed through 10
ohm resistors. (the one feeding shorted TO-220 is blown open). The dual
transistor that feeds resistor also blown, and the Half bridge driver
that fed that.? But, the CPU still talks to the programmer, So I thought
it might be worth a try to fix it.? My current plan is reprogram the
controller to limit amps by 1/6th lower than original 275A max, and
remove matching labelled device on the other side of the half-bridge
circuit. I ohmed out the power circuit board and drew the schematic. But
the logic board has 10x the traces & devices. & I don't really need the
whole thing (and I don't have a month of personal energy to reverse
engineer it), just the circuit from that half bridge driver out to the
power devices. What I really need is a Curtis 1266A service / repair
manual. But, I might be successful without that... or else generate a
bunch more smoke ...? Either way, I still the the E-15 motor electrical
specs]

John




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