Background: I'm currently working on a robotics design that will drill through soil.

I have selected a 48V motor who's nominal current is 3.17A and has a stall current of 42A. I will be driving the motor with a microcontroller and motor driver.

However I am having some trouble with my design.

The motor driver includes over current protection circuitry, and I need to select a resistor to set the max allowable current.

Would it be more optimal to use a resistor that caps the current at exactly 3.17A? Or would it be better to provide some margin, and make it 4A?

The over current circuitry has a feature where it resets itself after every PWM cycle and checks if the current is too large again. I believe this is "current chopping" so the motor should start up. (Startup time is not necessarily important for this.)

Extra information: Here's a link to the datasheet (overcurrent info starts at the bottom of page 12)

DRV83x2 Three-Phase PWM Motor Driver

Any input would be appreciated. Thank you for reading

  • 1
    $\begingroup$ Maybe this is a better question for the Electrical Engineering SE $\endgroup$ – NMech Dec 16 '20 at 15:00
  • $\begingroup$ It would be beneficial to include datasheet in the question. Use this link to edit the question to include datasheets $\endgroup$ – user8055 Dec 16 '20 at 15:01
  • $\begingroup$ My mistake I meant to link it. Here's a link to the datasheet (overcurrent info starts at the bottom of page 12 and the circuit in question can be found on page 20) ti.com/lit/ds/symlink/drv8312.pdf?ts=1608005703591 $\endgroup$ – gunter Dec 16 '20 at 15:10
  • $\begingroup$ I will try posting on EE SE @NMech $\endgroup$ – gunter Dec 16 '20 at 15:10

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