Not sure if the attachments will come through, but I have the following:

GE Elec Trak E-15 performance curve.jpg
GE Elec Trak performance curve e20pwcrv.jpg

Several years ago I added a horsepower curve for the latter diagram, titled:

GE Elec Trak performance curve e20pwcrv_HP added.jpg

I did this by using the If=1.9 RPM curve to calculate horsepower, which is what I believe the e20 production motor uses based on other GE literature. I suppose the other curves are with field weakening engaged? My E20 didn't run at all when I got it, so absolutely everything was gutted and it runs with no field weakening using a Curtis controller. As a result, I have no experience using the OEM field weakening.

I'm not sure these answer your original question, though, as I believe the graphs show armature amps and not field amps.

Regards,
Ben

On Saturday, December 27, 2025 at 11:20:22 AM EST, john <johnreinhard@rochester.rr.com> wrote:


Update:

Chris gave me some good info & made some good points.

I am still looking for performance graphs, if anyone has them.

I searched a bit more, and discovered a post, on this group, back in
2010, by 'Mike Wallace' - or Mike in Kentucky, who mentioned that he had
copies of performance curves for E-15 traction/main motor from GE.

Anyone know if he is still around (on this group or others), so I could
contact him ?

Thank You,

John


On 12/25/25 18:47, john wrote:
> Hi all,
>
> I think I asked this a couple years ago, and never got the graph or
> charts I was hoping for.
>
> Does anyone have the field / armature profiles for the traction motors ?
>
> I am primarily testing with an E-15 motor, but E-20 or E-12 (SepEx
> version) would be helpful.
>
> I am testing on a clone of Curtis 1268-5403 Sepex Controller, and need
> ratio of field amps to armature amps, at minimum.
>
> If no one has the original GE motor info, maybe someone with an
> Alltrax controller could look at the settings ? (unless they are hidden).
>
> Any help would be appreciated.
>
> Thank You,
>
> John
>
>
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> Elec-trak@cosmos.phy.tufts.edu
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