L293d getting hot and motor keeps moving

[bob]


Hello everyone. So Im using Arduino uno with L293d and nema 17. Using an external 12v power supply going to l293d. When I move the motor with the app the l293 chip starts getting hot.I tried stacking 2 l293 thinking it’s drawing to much amps. But the chips still gets hot. The motor keeps trying to move on its own after 2 mins running. I’ve tried using 7.5v power supply to and same outcome.This my 2 Arduino project so I’m a newbie. I changed the code to my board and motor. Any help would be appreciated

[brownrb]

Do you have a link to where you purchased the stepper motor from, or a part number?
You mentioned L293D?
Which one? Do u have a link?
Not all L293D boards work with this project.

[bob]

Here is the l293d from zyltech https://www.zyltech.com/motor-drive-expansion-shield-board-l293d/

nema 17 is on from my ender 3 that i replace with skinnier one. Its a Moon's nema 17 c17h02024

[brownrb]

I could not find that on their web site.

But

I think you will find that the motor is rated at around 1.5A per coil

Now - the maximum current that a stepper motor will draw is around 2x coil current, because when the motor steps, there will be a step where both coils are energized at once, so in this case maximum current for the stepper motor is 3A

You are using an L293D motor shield. The figures from that site are
L293D chipset provides 0.6A per bridge (1.2A peak)

That would explain why your board driver is getting hot.

[bob]

Ok. thanks a lot. I'm going to order different one today.