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Question about Stepper drivers.
Moderators: adafruit_support_bill, adafruit

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Question about Stepper drivers.

by IBuildThings on Fri Apr 21, 2017 2:05 am

Hey, I am looking to drive two of these: https://www.lulzbot.com/store/parts/nema-17-stepper-motor with a feather, I currently own a DC Motor + Stepper FeatherWing but I was told by a member here named Bill (Hopefully he responds to this haha he knows his stuff) that the FeatherWing doesnt support the draw these steppers pull. I need the torque of these motors for my project so now I need to track down some drivers.

Would these work? I know they arent an adafruit product but I already own 2 of them: https://osepp.com/electronic-modules/breakout-boards/92-osepp-motor-driver-module

Responses are much appreciated!

Thanks!

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Re: Question about Stepper drivers.

by adafruit_support_bill on Fri Apr 21, 2017 6:26 am

I don't think so. The LS298 is a constant voltage driver, so you would need to use a very low supply voltage to avoid overheating the windings. And powering that way, you will not be able to take advantage of the torque that those motors are capable of.

To get the best performance from motors like that, you need to use a current-limiting 'chopper' driver. The theory behind that is described here: https://learn.adafruit.com/all-about-st ... he-stepper

We have a couple of current limiting driver options:
https://www.adafruit.com/product/3297
https://learn.adafruit.com/current-limi ... th-drv8871

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Re: Question about Stepper drivers.

by IBuildThings on Fri Apr 21, 2017 3:50 pm

So what Driver do you recommend I use to get the most torque out of these motors? I am using a feather esp8266 as the control board and I wish to drive two steppers. Also I know it kinda goes against everything capitalist (I am not against capitalism lol I work retail right now so I know how it is suggesting competitors) but if you guys don't supply the driver I need can you recommend one as I am hard pressed to find one that meets the requirements.

Thanks Bill!

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Re: Question about Stepper drivers.

by adafruit_support_bill on Fri Apr 21, 2017 3:59 pm

The specs for those motors are not complete - but you can infer from the voltage an resistance specs that the windings are designed for up to 1A. That is within the capabilities of the DRV8833: https://www.adafruit.com/product/3297

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Re: Question about Stepper drivers.

by IBuildThings on Fri Apr 21, 2017 11:06 pm

Awesome thanks Bill ill pick two of them up asap and let you know how it goes :)

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Re: Question about Stepper drivers.

by IBuildThings on Sat Apr 22, 2017 2:50 am

Will I need to configure the chip any special way to run the Lulzbot nema 17's I linked in previous posts? Also what power supply should I use to get the most torque out of them. I want the power supply to be a plug power supply not a battery. One more thing, would the DRV8833 be better or would the TB6612 be better?

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Re: Question about Stepper drivers.

by IBuildThings on Mon Apr 24, 2017 11:45 pm

Bump for above question ^

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Re: Question about Stepper drivers.

by adafruit_support_bill on Tue Apr 25, 2017 5:45 am

Out-of-the box, the DRV8833 is configured for 1A current limiting. So that should work with those motors as-is.

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Re: Question about Stepper drivers.

by IBuildThings on Tue Apr 25, 2017 2:47 pm

Thanks Bill!

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Re: Question about Stepper drivers.

by IBuildThings on Thu Apr 27, 2017 4:10 am

What type of power supply should I use for the DRV8833 and the Lulzbot Nema 17's? I want to use a dedicated plug in supply so that I never have to worry about charging batteries. And is there any way I can have one for both or would I need two separate ones?

Thanks Again Bill!

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Re: Question about Stepper drivers.

by adafruit_support_bill on Thu Apr 27, 2017 6:22 am

For good performance from those motors, I'd suggest something in the 12v range. The Feathers are designed to be powered from 3.3v-5v. More than that will overload the voltage regulator. So you will either need two supplies, or one supply plus a step-down converter for the Feather: https://www.adafruit.com/product/1065

Since you have 2 motors with windings rated for 1A at 2.48v. That translates to roughly 0.2A at 12v. Each motor has two windings and you have 2 motors, so that means you would need about 0.8A at 12v to power the motors. https://www.adafruit.com/product/798

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Re: Question about Stepper drivers.

by IBuildThings on Thu Apr 27, 2017 1:50 pm

So this supply will be able to power both my steppers? https://www.adafruit.com/product/798

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Re: Question about Stepper drivers.

by adafruit_support_bill on Thu Apr 27, 2017 1:53 pm

Yes, that should do it.

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Re: Question about Stepper drivers.

by IBuildThings on Thu Apr 27, 2017 1:55 pm

Awesome thanks again Bill. Love this service you guys provide. I will learn so much here I am not normally the one to ask questions haha.

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Re: Question about Stepper drivers.

by IBuildThings on Thu May 04, 2017 7:49 pm

Hey Bill I just got all I need to get this going and I am having a problem. is the 3.3v logic of the feather hazzah 8266 not compatible with the DRV8833 Driver?

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