Having RPM/volt permits me to be able to calculate torque for given output power. And from there calculate Torque/Amp, relative to field current. Which then allows me to be able to chart torque at different amperage levels on the armature...
Torque is expressed in ft-lbs.
I confirmed my numbers by calculating backwards with simpler formulas, and compared them to the 8-in series wound ADC motor's chart.
Said chart shows that the series wound motor puts out 25 ft-lbs @200 amps, and low and behold, my math puts my motor, with 24v on the field, at the same 25 ft-lbs. At 600A - which is both triple armature current
and field current in a series-wound motor - the series wound puts out ~100 ft-lbs. If I triple
only my armature current, I can expect to get 76 ft-lbs, but if I triple my field current as well, I can expect to see 106 ft-lbs...pretty much the same as the series wound.
Of course, my field coils won't like running 72 amps, so I'm not likely to do that. Safer to just crank the armature amps up a bit to make up the difference, since it should take the punishment a bit better...but I don't think I'll want to push 100 ft-lbs through a transmission designed for maybe 70.
Right, EVmetro? Metro transmissions don't like 100-ft-lbs much, do they?
Anyone more knowledgeable can feel free to correct me and my math. I've seen a number of people asking for charts/curves for their unknown SepEx and not finding any, so hopefully some people will find this useful.
Now I can use this to get a rough idea of what my smaller motor can put out...
