3341
Building or Buying a Wood routing table.. Beginnners guide.. / Re: Problem with upgrade nema 23 to nema 34
« on: September 21, 2016, 10:57:21 AM »
So your NEMA34’s are stalling out at around 500 rpm.
Your gearing has increased the torque required to drive the axis by a factor of 3 and my best guess would be that your motors do not have quite enough torque at that particular rpm (I am assuming you have increased the DM556 current setting to match the NEMA 34’s current rating).
Just my opinion…
Possibility of mid-band resonance but this could easily be ruled out by attaching a small (reasonably light-weight) flywheel directly to your motor shaft. This would alter the mass of the armature and if the behaviour of the motor was different (different point of stall) then I would investigate fitting the proper dampeners to your motors.
Alternately reducing the up-gearing would reduce the required axis torque. This would increase motor rpm (reducing motor drive torque) but I would expect >1000 rpm from those motors when driven at 48 volts.
Tweakie.
Your gearing has increased the torque required to drive the axis by a factor of 3 and my best guess would be that your motors do not have quite enough torque at that particular rpm (I am assuming you have increased the DM556 current setting to match the NEMA 34’s current rating).
Just my opinion…
Possibility of mid-band resonance but this could easily be ruled out by attaching a small (reasonably light-weight) flywheel directly to your motor shaft. This would alter the mass of the armature and if the behaviour of the motor was different (different point of stall) then I would investigate fitting the proper dampeners to your motors.
Alternately reducing the up-gearing would reduce the required axis torque. This would increase motor rpm (reducing motor drive torque) but I would expect >1000 rpm from those motors when driven at 48 volts.
Tweakie.