@ njbuch - Haha, I’m afraid we’ll have to use… Math!
These values aren’t needed unless you want to optimize. I was running just fine without having the Ke or the correct BEMF slop. I had to guess at the ACC and DECC values for a long time (and I still do sadly). The device’s defaults are good enough to drive a small stepper (NEMA14) right out of the box. I’ve just been doing this so long that I’ve learned the quirks and gotchas of stepper motors over the years (4 years sob). :’(
Ah I just remembered. Sparkfun has a basic tutorial for their L6470 implementation
[url]https://learn.sparkfun.com/tutorials/getting-started-with-the-autodriver[/url]
Well I tested a NEMA23 stepper motor today by driving it with a hand drill. My True RMS multimeter registered a peak of 107 Volts at 2.055 Khz on 1 phase. Granted I was putting in more than 250Watts of kinetic energy from the drill. That should be a KE of 0.052
Now I have to find a way to get a voltage comparitor to withstand 107 volts!