stepper acceleration rate - limits?

[dsc]

Thanks irving, can I ask where the 2Nm @ 100RPM and 1Nm @ 200RPM came from?

If 68VDC gives around 50% of what a 110VAC can do torque-wise, here's a chart made using the info from the original 110VAC data from my previous post:



This would mean still around 4Nm at a pretty wide range of speeds, which isn't the case as testing has shown.

The 8Nm motor used to stall sometimes at 480RPM at which it had 3Nm:

http://www.americanmotiontech.com/Up...80_EC_1000.jpg

this means that the bigger 12Nm must have at least 4Nm or so as it's not stalling at all. It begins to stall at around 180RPM which must be the moment when the torque drops below 3Nm or around. I'd gladly use the smaller motor, but it hasn't got enough starting torque :( it seems that I need around 10Nm on startup, which the small motor cannot deliver.

Regards,
T.