Nema17 Slimline rated current?

Discussion in 'General' started by Tincho85, Jun 21, 2017.

  1. Tincho85

    Tincho85 Member

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    I've recently bought this stepper motor to use with the Titan Aero but I don't know how to properly
    set the current.

    Using Repetier Firmware and a Rambo board.

    I took a look at the datasheet but there is no mention of the stepper's max current.
    https://wiki.e3d-online.com/images/2/2e/E-MOTOR-NEMA17-ALL_PUBLIC.pdf#sthash.zz8FglH4.dpuf

    I'm a noob when it comes to this stuff.

    Any help would be much appreciated.
    Martin
     
  2. elmoret

    elmoret Administrator

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    Probably somewhere around 800mA. If the stepper is too hot to keep your hand on, the current is too high.
     
  3. dc42

    dc42 Well-Known Member

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  4. Old_Tafr

    Old_Tafr Well-Known Member

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    Interestingly not the motor originally supplied with the Titan extruder, which also didn't come with a cable but does have a socket with pins on it.

    Also the originally supplied (from the useless data printed on the motor) the only obvious information is 1.8o / step not the 0.9o / step for the slimline mentioned here. (What has to be changed if I want to swap out the original to the lighter and 0.9o / step motor?)

    These originally supplied are...
    Wantai Stepper Motor
    "Model" 42 BYGH (two unintelligible characters) 609 L20 P1 - X2
    1.7A (U) 1.8deg/step
    No 1503030109 Pass 151218
     
  5. Old_Tafr

    Old_Tafr Well-Known Member

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  6. Tincho85

    Tincho85 Member

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  7. Old_Tafr

    Old_Tafr Well-Known Member

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    What may help explain the Model info (as the XX in NEMA-XX only stands for the diameter of the faceplate so that you know a motor will fit) is...

    http://www.reprap.org/wiki/NEMA_Motor
     
  8. Tincho85

    Tincho85 Member

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    Quick update, just in case someone else is having the same issue.

    Got it working, motor current was set to 125, which is arround 0.7a.
    (Still playing with this value, maybe the current could be lowered a bit more).
    * No signs of skipping steps.
    * 38ºc working temperature after printing for 30 min (measured the back of the motor with a thermocouple).

    I've already submited a support ticket.
    This information should be available and easily found:

    1) Rated Current.
    2) Phase Resistance.
    3) Phase Inductance.
    4) Rotor Inertia.
    5) Detent Torque.
    6) Weight

    I hope E3D read this and update the datasheet.
    Despite the small setback, I will gladly buy again.

    Martin.
     
  9. Antoine

    Antoine Well-Known Member
    Staff Member

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    I hope this can help some of you.
     

    Attached Files:

    Rubikscuber202 likes this.
  10. Tincho85

    Tincho85 Member

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    Thanks Anoine, that pdf seems new, or at least that's not the one they share under "description".
    It seems to correlate to the info provided by E3D support team:


    Thank you all for the help and happy printing.
    Martin
     
  11. Grooperdude

    Grooperdude Member

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    the Only way i have been able to keep my Pancake Nema17 0.9 degree stepper working with my Titan is to set the Current to 1.37A which is just...i mean... thats SO high. the thing gets up to like 56 degrees C even with a small heatsink hooked onto it. i thought the Titan was supposed to be easy to run? anyone here have any suggestions?
     

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