Nema 17 4.8kg/cm stepper motor rated current

[WillL84]

Hey guys, I've got an acrylic i3 kit that's been upgraded with the 2020 frame. I just bought some TMC2130 drivers and a Titan Aero extruder. I'm trying to get the VREF setup for the drivers but I can't find any info at all on the nema 17 4.8kg/cm stepper motor that FT uses for the Y axis on the i3 printer kits. They're not for sale anywhere and the Google Drive only has info on the smaller 2.6kg/cm motors.

I do know from the Teaching Tech YT video that the TMC2130's need RMS current and not rated current but he gives the formulas for that. I need to know the rated current for this motor so I can get it set properly.

I can get the Z axis to move and home and the X and Y to move but using sensorless homing the X and Y don't do anything. They just make noise and then it says it's homed.

[Tin_Falcon]

nema 17 4.8kg/cm

a little google bird tells me these can range from 1 amp per phase to 2.5 amps per phase considering these are older motors i would expect a bit in the higher range.
IMHO try about 1.5 amps to start then adjust. accordingly if they stall the y need more amps if the get hot reduce the amperage.
if you want to be more conservative start with 1 amp then bump up a bit at a time.

The other option is upgrade the motors then you know the spec. these only draw 1 amp per phase and have the same torque as what you have and are only $17 each

https://www.printedsolid.com/collections/motors/products/nema-17-high-temp-motor?variant=23283737165909
or these a bit more holding torque and $10 each
https://folgertech.com/products/copy-of-nema17-17-stepper-motor-5000g-cm-3d-printer-reprap-medel-prusa?_pos=8&_sid=003b05eaa&_ss=r

[carefudundae]

Did you look to see if it says it right on the motor? I looked at a motor on my FT kossel (which is a 5 kg/cm stepper) and it says 1.5A stamped right on it.

[WillL84]

I don't think it does but I'll check when I get home

[WillL84]

Well I was incorrect, it's not even the 4.7 that mine had on the Y. Mine has a 5.3 but it doesn't list current. The X and Z both use little 2.6 ones that also don't list current.

I did end up just buying a set with known values. Working on some big upgrades to mine as well. Started as an acrylic i3 then they released the 2020 so I got the upgrade kit. Now I've added a Titan Aero, BLTouch and a bunch of other goodies so I'm upgrading the frame once again

[Ron]

Motors similar to this rated at "3.4 volts" typically have current ratings in the 1.5-1.6 ampere range.
For example-17HS5005-20B.pdf (543.1 KB)
To be safe, if you run it at 1.3-1.4 amperes you should be OK.
Check to make sure it does not get too hot.
It should not exceed around 50C anywhere on its exterior even after extended operation.
I hope this helps.