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

[Charlie <medievalist gmail com>]

The table in the Wikipedia article was supplied to me by Walt.  Super nice
guy and very knowledgeable.

--Charlie


On Fri, Dec 16, 2022, 12:34 PM Robert Troll <roberttroll hotmail com> 
wrote:

> Walt K was the guy who really KNEW these motors. Not sure if he was still
> around. Back when i was working on a curtis design this came up. At that
> time he said that the field should never use any more than 2-4 amps
> (E15-E20). So i simply ran 36V to the field, and put a 4a fuse on it.
>
> Never had any issue ever. Motor always ran at its proper RPM and never 
> got
> hot on me even when plowing.
>
> So if i read you right, sending a possible 45 amps to the field seems WAY
> out of spec and i would be concerned.
>
> ________________________________
>
>
>
> ----------------------------------------------------------------------
>
> 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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