What size resistor for Nema 23 Stepper Motor 4.2A 3.0Nm


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    Activation process cncneon's Avatar
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    Default What size resistor for Nema 23 Stepper Motor 4.2A 3.0Nm



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    Member TMToronto's Avatar
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    Default Re: What size resistor for Nema 23 Stepper Motor 4.2A 3.0Nm

    Could you provide more information on the set-up you are using - other components, circuit/wiring, etc...?



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    Activation process cncneon's Avatar
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    Default Re: What size resistor for Nema 23 Stepper Motor 4.2A 3.0Nm

    24v 15A power supply
    Geckodrive G540 4-Axis Digital Stepper Motor Driver
    ESS smoothstepper Warp9
    Mach4
    bench top 3 axis gantry
    all I can think of
    As I understand it, a resistor would help with heat buildup on the steppers
    After say 1/2 hour, they'll be 135 - 145 F - should I be concerned?
    cncneon



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    Default Re: What size resistor for Nema 23 Stepper Motor 4.2A 3.0Nm

    Any reputable stepper drive, maintains the exact motor plate current throughout the RPM range, high temp in steppers is common due to the constant rated current applied.
    As opposed to servo's, which only supply current as and when required.
    ..

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    Default Re: What size resistor for Nema 23 Stepper Motor 4.2A 3.0Nm

    Is this relevant to your question? If you have seen it my apologies.

    Attached Thumbnails Attached Thumbnails What size resistor for Nema 23 Stepper Motor 4.2A 3.0Nm-g540-current-setting-resistors-jpg  


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    Default Re: What size resistor for Nema 23 Stepper Motor 4.2A 3.0Nm

    Why don't you just try the next current setting down on the driver?.
    See if that helps.
    They do generally get hot. If you can't touch it for very long, that's when you have a problem.



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    Member phomann's Avatar
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    Default Re: What size resistor for Nema 23 Stepper Motor 4.2A 3.0Nm

    Quote Originally Posted by cncneon View Post
    What size resistor for Nema 23 Stepper Motor 4.2A 3.0Nm
    And if you know of a good source but dont want to push my luck.
    Thanks
    cncneon
    The G540 can deliver 3.5A max per motor. So a 3.5kohm resistor will allow the G540 to deliver the full 3.5A.
    The G540 cannot dealer the full 4.2A per phase.
    You can also leave out the resistor. In this case, the G540 will deliver the full 3.5A, but the drive will not reduce the current when the motor is idle and not moving. Not having a resistor inserted will contribute to the motor heating up.

    Running the motor slightly below the rated current is common as it provides for a higher max speed for the motor.

    I’d suggest using in a 3.5kohm resistor as it will reduce the heating, and deliver the max current (3.5A) to the motor.

    Cheers,

    Peter.


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What size resistor for Nema 23 Stepper Motor 4.2A 3.0Nm

What size resistor for Nema 23 Stepper Motor 4.2A 3.0Nm

What size resistor for Nema 23 Stepper Motor 4.2A 3.0Nm