Originally Posted by somanywelps
Do you have the torque curves (specifically for the 55kw motor).
Also I assume the RPM ratings are different.
Are these still BLDC?
All the motors are rated at 320vdc 3200rpm except the 60kw motor is rated at 540vdc 3500rpm.
The torque 'curve' (more like a table top) is in the thread above. Please keep in mind that the test was done with a 120kva, 375amp controller. That is why it is only ~420nm and suddenly tapers off at 110kw. The Scott drive is nominally 400amps at 400vdc for 160kva, so you would see quite a bit more power using the Scott controller. The 600 amp Scott controller should put out a nominal 240kva for a dramatic increase in peak torque and power.
I think it is much better to dyno a drive system than to use empty calculations based on a spread sheet using unknown test parameters, but if you want me to extrapolate, here are the numbers I come up with:
55kw motor at 320v, 190A makes 164nm (this is manufacturer's continuous rating).
with the 400v, 400A controller it calculates to 431nm max torque
with the 400v, 600A controller it calculates to 650nm max torque.
Now these are just calculations. In reality you have battery sag and motor/controller efficiency goes down as amps go up, so figure a bit less.
If you run the same type of totally unproven calcs on the 540v motor you get:
60kw motor at 540v, 111A makes 164nm (continuous rating)
with 600v, 400A controller it calcs to 650nm (sound familiar? see above)
with 600v, 600A controller it calcs to 984nm.
Yes, those numbers sound absolutely ridiculous to me. That is why I want to put one on the dyno. I am not a big fan of empty speculation.
Now you see why I recommend keeping the shaft as large as possible.