Stepper Motor and Driver Questions

Hello, first time posting. I wanted to check if the DRV8825 stepper motor driver would work with this 71.5A/coil Nema17 stepper motor ( https://www.oyostepper.es/category-6-b0-Motor-paso-a-paso-NEMA-17.html ).

I have tested a couple of these motors and the driver seems to be able to step the motor, although both the driver and motor get hot quickly, even when I just hold the motor in a constant position without stepping. Unfortunately, on my second test I seem to have damaged the motor or the driver, as the motor no longer steps, but just makes a high pitched squealing noise. I can still hear the motor trying to step when I send pulses to the stepper pins though.

I feel like this setup should work, as the driver has a 1.5A/coil current output, so it shouldn’t be providing 1.5A above the motor current limit, and if it does, a current limiting potentiometer could be used to protect the motor from overcurrent. On the other hand, I’m concerned that the motor may be trying to pull more current than the driver can provide, thus burning out the driver, unless my understanding of how stepper motors and drivers work is incorrect.

Any suggestions on how to determine which motor or driver is bad? Or should I use these two together? Thanks!

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Can you post a link to the actual motor you are using, rather than the suppliers search page.

I presume this is a 1.5A per phase motor, not 71.5A.

How have you wired the driver to the motor? A squealing noise can indicate an incorrect connection. How hot is hot? These motors will run OK at elevated temperatures, but they should not be so hot that they can’t be touched.

What voltage are you providing for the motor input to the driver, and what is the current capability of that power source?

Which DRV8825 module are you using? If it has an adjustable current limit what voltage have you used for setting that limit, and have you confirmed that the formula you used to calculate the voltage is correct for the sense resistor installed in that module?

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Hi @Fern298231,

Welcome to the forum!

Nice work getting hands-on and reaching out early, that’s the right approach. Jeff brought up some important points, and once we have the details he mentioned, we’ll be in a much better position to understand your setup and help you move forward.