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BlackBox Motor Overheating

Discussion in 'Motors' started by dwh, May 1, 2019.

  1. dwh

    dwh New
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    The NEMA 17 stepper motors are running too hot from the BlackBox Controller. I have adjusted the axis current 'pots' fully counter clockwise against the stop. I tried the clockwise direction, but that only increases the heatup and cogging. There is more than adequate torque at this minimum setting, but the motors seem to be getting too much current, and I do not think they will last very long. The controller is used on a laser etcher using the X-axis, Y-axis, Y2-axis, and PWM/M3 signal.
    The system has accurate positioning and laser control, but has not been used very long in fear of damaging the stepper motors.
     
  2. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Where's the NEMA17s from? Blackbox at minimum outputs 1.0A - our NEMA17s are 1.7A.
    Heat is normal, putting a measurement to "hot" could help me judge if its problematic
     
  3. dwh

    dwh New
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    The steppers are standard duty that I have had for several years. A measurement of hot might be that they are too hot to touch after only 3-5 miutes, and hot enought to generate a scortching smell. This system has used other controllers without over heating and acutally staying cool for long periods of time. I may has some settings wrong, as I have just used most default settings. The system seems to function properly in displacement and laser control. If it would help to have a print out of the settings, I will try to get a listing.
    Thanks
     
  4. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Find the datasheet of your motors, who knows, maybe they are tiny little 700mA coils or something. BlackBox is 1Amp minimum (as our NEMA17s are 1.7A) - 1A is a good minimum for most motors, but with your unknown ones its hard to know. Or consider getting motors from us, then you know they are 1.7A 3.0V coil motors, which works great with BlackBox
     
  5. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Consider the old popular A4988 Pololu drivers, at max they put out 800mA (; BlackBox is a couple levels above that!
     
  6. sitoru

    sitoru Well-Known
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    what kind of speeds can you get from your steppers? right now I'm using some nema 17s from a delta 3d printer I took apart to use for my diy CO2 laser. They are rated for 1.7 but I think the torque is only 36 oz. I'm using them with my blackbox, but the other day I noticed they were getting hot. I can't seem to push them past 5000mm/min reliably.
     
  7. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Steppers are not inherintly 'fast' by nature. Also keep in mind Grbl's maximum steps per second limits
    - use larger tooth count pulleys
    - use lower microstepping
    - use higher torque motors
     
    MaryD and Christian James like this.

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