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Correct Connection of Stepper Motor


#1

Hi,

Recently, I would like to try a project with multiple stepper motors. I am trying to connect the stepper motor as shown in the diagram. The stepper motor driver used is Pololu DRV8825 Stepper Motor Driver Carrier.

Motor A: http://www.omc-stepperonline.com/download/pdf/14HS13-0804S.pdf
Motor B: http://www.omc-stepperonline.com/download/pdf/17HS16-2004S1.pdf
Motor C: http://www.omc-stepperonline.com/download/pdf/17HS24-2104S.pdf

Will there be any problem with the connection? Any suggestion is welcomed.

Thank you.

Best Regards,
Qzai09


#2

Hello.

Stepper motors B and C in your setup both draw more current than the DRV8825 can handle, and trying to control them from the driver could permanently damage it if its current limit is set too high. However, it might be possible to achieve some kind of motion from those two stepper motors with a low (~1.1A) current limit set on the driver. You can learn more about setting the current limit under the “Current limiting” section of the DRV8825’s product page.

As for your connections: instead of a single 100uF across your power and ground on your power supply, I recommend adding a capacitor to each DRV8825 across VMOT and GND, close to the board. Also, I am not sure how closely the ground connections in your diagram match what your system will look like, but it would be better to connect the ground from the Nano to the ground from the power supply where the drivers grounds are also connected.

-Jon


#3

Hi Jon,

In the product page, it states that the maximum current per coil for DRV8825 is 2.2A with appropriate cooling. If I am providing sufficient cooling, is it possible for it to run?

Best Regards,
Qzai09


#4

Getting 2+ amps per coil from this driver is going to require substantial cooling (likely involving forced air flow and a large heat sink). We do not have any specific advice for how to do that and we generally view adding a heat sink and external cooling as an advanced modification that should only be made by those who have experience with that kind of thing. I am also not sure how practical it will be for you to achieve this level of performance from the DRV8825. However, if you do decide to try to push the limits of this driver, we would certainly be interested to hear about your results.

-Jon


#5

Hi Jon,

I will try to tune the driver from low current first to check if it can sustain my requirement. If it is unable to do so, I will only attempt to make the current higher.

Thank you.

Best Regards,
Qzai09


#6

The pdf on omc are broken, you can have a look at https://www.oyostepper.com/.