17BB-H132-11 Stepper Warm to the Touch

I just got my stepper motor working. Plugged it into a TB6612FNG and a 12V wall wart for power. Been spinning it like crazy on my desk, reveling in my new accomplishment. However, I just noticed it's quite warm. Not "oh I just burned myself" warm, but too warm for me to just hold comfortably. From what I gather, this is normal. I am, afterall, running current through it constantly. What I don't know is whether or not I should worry about it overheating. I don't have any load on it yet, just toying around with it free-spinning on my desk. Any concerns?
David
PropWare: C++ HAL (Hardware Abstraction Layer) for PropGCC; Robust build system using CMake; Integrated Simple Library, libpropeller, and libPropelleruino (Arduino port); Instructions for Eclipse and JetBrain's CLion; Example projects; Doxygen documentation
Tag me with "@DavidZemon" if you have a question for me. I will be checking these forums far less for the forseeable future.

Comments

  • 4 Comments sorted by Date Added Votes
  • Warm steppers are usually nothing to be concerned about. But, just to be sure, what's the winding resistance and current rating of the stepper?

    -Phil
    “Perfection is achieved not when there is nothing more to add, but when there is nothing left to take away. -Antoine de Saint-Exupery
  • Once the motor is up to speed you can drop the current but in the case of this chip it happens to be fixed but I noticed it had PWM input so maybe if you apply a little PWM at a suitable frequency you can reduce power consumption.
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  • Haven't found a current rating. Sticker on the motor says 75 ohms and 12V.
    David
    PropWare: C++ HAL (Hardware Abstraction Layer) for PropGCC; Robust build system using CMake; Integrated Simple Library, libpropeller, and libPropelleruino (Arduino port); Instructions for Eclipse and JetBrain's CLion; Example projects; Doxygen documentation
    Tag me with "@DavidZemon" if you have a question for me. I will be checking these forums far less for the forseeable future.
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 21,331
    edited July 14 Vote Up0Vote Down
    Okay, that would imply 160 mA, or 1.92 W per winding. With two windings dissipating power at the same time, that would amount to about 4W. So, yeah, it's gonna get a little warm. 'Nothing to worry about.

    But Peter is right: you don't need maximum input current if the motor is holding a position or up to speed -- unless there's an opposing torque.

    -Phil
    “Perfection is achieved not when there is nothing more to add, but when there is nothing left to take away. -Antoine de Saint-Exupery
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