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01-05-2021 #1
Even with motors of near the same inductance is proven.
Results using 60V on a G0704 sized mill, all driver settings identical, X & Y axis:
Nema34, 1080oz (7nm and change) 3.5mh inductance:
Loud, bad resonance, max velocity 2000mm/min, stalls thereafter, Inertia causes 0.2mm overshoots at stop.
Nema24, 566oz (4nm) 3mh inductance:
Near silent, max velocity can exceed 3000mm/min, stops dead, accels like a rocket.
Still have a 1080oz on Z, (2000 is quick enough there). Might need it for my spindles new servo motor (7kg weight)
Upping the power to 72V, might change driver to a stepperonline 100vdc input one (psu can go to 80).
Nema 34 1600oz (12nm) YES I was one of those newbies
Thrown straight in the bin. Too embarassed to mug it off onto someone else!
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02-05-2021 #2
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02-05-2021 #3
Need to do more research but the CL86Y atm.
I'm still pondering about going closed loop later down the line. If this can run in open loop as well (for the time being), then I'll get it right now.
Otherwise it'll be the DM860Y as the machine sits, and then I'll look again at a later date if I change to CL.
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