Recomendation of stepper motors…
-
Chose a motor with sufficient current handling. Generally in nema 17 size longer motors can handle more current. A Tevo LM is going to be easily driven by a 2A motor which you can nominally run at 1.6A or thereabout using duet (this keeps motor heat build up to manageable levels).
Inductance is the motors abilitiy to act as a generator, as you turn it it generates power which counteracts your voltage being used to turn it, but since they generate low voltages at the sort of speeds 3d printers use, supplying them with 24v (powering your duet from 24v) gives you more overhead. So 24v gives faster speeds for any given motor but faster still for low inductance.
The motors voltage rating is not important.
Select the lowest inductance motor, which is the size and current rating you need to move your axes around. Going over 3A is a bit pointless as the duet can't supply more than 2.6A (approx).
I went for these https://www.omc-stepperonline.com/hybrid-stepper-motor/nema-17-bipolar-09deg-44ncm-623ozin-168a-28v-42x42x47mm-4-wires-17hm19-1684s.html
Perfect, thanks for the link…
-
I use those motors in my delta, but I chose them when it had a Duet 085 in it. For the Duet WiFi or Duet Ethernet, I would choose the -2004 version of the same motor instead of the -1684.
-
-
I use those motors in my delta, but I chose them when it had a Duet 085 in it. For the Duet WiFi or Duet Ethernet, I would choose the -2004 version of the same motor instead of the -1684.
Any reason why David?
I also have those 2004 motors on the XY stage on my coreXY, while they work just fine, I found they make more noise (high pitch whine) than my 2.4A 1.8deg Wantai stepper motor I use on the Z-axis. -
I suppose the 2A motor just gives you a bit more torque than the 1.68A which are popular when using plug in drivers as that's about the biggest motor you can reliably drive without overheating the driver.
That being said I can move 400mm/s on my delta with the 1.68A motors.
I do also have some custom made wantai motors on my corexy (they just have dual shaft and are 0.9 deg which they didn't have in stock) and they are nicely made, quiet and accurate.
-
these?
Yes, those. They have lower inductance than the 1.68A version, so full torque should be maintained to a higher speed.
-
Just curious what everyones thoughts on the Wantai 42BYGHM810 are? They seem to be almost perfect with the rated current at 2.4A and the inductance at 1.8mH. I feel like I am missing something here because all the other motors I have looked at the inductance is much higher.
Specs / Costs:
http://www.wantmotor.com/product/42byghm.html
https://garagedays3d.com/shop/mechanics/stepper-motor-nema17-wantai-42byghm810/
https://www.aliexpress.com/item/4-lead-Nema17-stepper-motor-42BYGHM810-68oz-in-48mm-2-4A-5mm-shaft-CE-ROHS-ISO/560349599.html
https://www.ebay.com/itm/Wantai-5PCS-Nema17-Stepper-Motor-42BYGHM810-0-9-4200g-cm-48mm-2-4A-3D-Printer-/321350696340Any feedback / enlightenment would be appreciated…
-M
-
That wantai motor looks great, might get some myself.
-
I know right! I already have some motors in route from steppers online but am considering getting these too. One can never have too many steppers….
-
The low inductance of that Wantai motor would make it an excellent choice for a Delta printer.
-
hello guys.. from what i read i will use the Wantai 42BYGHM810.. i have a question.. for a bowden setup what extruder motor should i use? the same? and for dual Z axis? thanks
-
@whosrdaddy said in Recomendation of stepper motors…:
I use those motors in my delta, but I chose them when it had a Duet 085 in it. For the Duet WiFi or Duet Ethernet, I would choose the -2004 version of the same motor instead of the -1684.
Any reason why David?
I also have those 2004 motors on the XY stage on my coreXY, while they work just fine, I found they make more noise (high pitch whine) than my 2.4A 1.8deg Wantai stepper motor I use on the Z-axis.Interesting. I use the same 2004 motors for XY and Z on my corexy and notice no whine at all and they are set to 1700 current.
-
So 17HM19-2004S or Wantai 42BYGHM810 are suitable for cartesian printers also (overkill?)?
Or is there a more suitable ones? Especially with 12V power supply (24V is planned, but not at the moment). -
@obeliks said in Recomendation of stepper motors…:
So 17HM19-2004S or Wantai 42BYGHM810 are suitable for cartesian printers also (overkill?)?
Or is there a more suitable ones? Especially with 12V power supply (24V is planned, but not at the moment).I asked myself the same question, especially the overkill part, as I am in the same position.
IIRC, we have both started with an Anet A8, right @OBELIKS?
-
Correct, the only difference is that I started with an older one. So the data on Wiki page is supposed be right.
What did you choose for frame? I went with P3Steel Toolson mk2 -
@obeliks I will answer that in another thread (that I am about to start) in the "My Duet controlled machine" category. Don't want to hijack this thread for it.
Regarding these 0.9° motors definitely have a lower "Speed at which torque starts to drop" (EMF Calculator at https://reprapfirmware.org/) then all of my 1.8° candidates. I think I remember that this is normal but not sure on that. Maybe someone could elaborate on this part.
-
It seems like a trade-off:
0.9°/step --> higher resolution than 1.8°/step
0.9°/step --> lower speed where the torque drops than 1.8°/step
low inductance --> "less Back-EMF" so higher speed where the torque drops
low inductance --> motor is more expensive -
Another thing that I found out and cannot explain (and I hijack this thread a little but it is still related): all motors I researched, independent of all specs always have a temperature rise of 80-85°C. What does this number depend on? All they had in common was being Nema 17 but they were different lengths, different torque, different voltage, different current, different inductance, different resistance.
How can this be?
-
my suggestion:
different length = different torque
same torque but lower voltage = high current = same power (P=U*I (formula for DC))
same torque but higher voltage = low current = same power
but the temperature they have is because of what heat they can emit and this depends on the surface area --> so they have all the same emitting "factor" per length (thats why the longer motors have the same temperature)Custom ANET A8
Custom Delta: D-PATCH (Delta Printer with Automatic Tool CHanging) https://forum.duet3d.com/topic/16082/d-patch?_=1596131234754All I do here is under this license: CC BY-NC-SA
-
@taconite I also thought that this might be a function of power vs. length but here are two particular motors where it does not fit:
- https://www.omc-stepperonline.com/nema-17-stepper-motor/nema-17-bipolar-18deg-18ncm-255ozin-07a-29v-42x42x25mm-4-wires-17hs10-0704s.html
Lenght: 25mm
Power: 2.1W - https://www.omc-stepperonline.com/nema-17-stepper-motor/nema-17-bipolar-18deg-13ncm-184ozin-1a-35v-42x42x20mm-4-wires-17hs08-1004s.html
Length: 20mm
Power: 3.5W
As you can see the second motor is shorter but has over 50% more power but they both have a max temperature rise of 80°C. I am clueless here. Also it is always stated that this temperature will be reached at full current in stand-still with both coils fully energized.
- https://www.omc-stepperonline.com/nema-17-stepper-motor/nema-17-bipolar-18deg-18ncm-255ozin-07a-29v-42x42x25mm-4-wires-17hs10-0704s.html
