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Adafruit DRV8833 DC/Stepper Motor Driver Breakout Board Ques
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Adafruit DRV8833 DC/Stepper Motor Driver Breakout Board Ques

by lh1 on Wed Jun 23, 2021 4:10 pm

Hello,

This is my first post so please let me know if this thread is not the recommended place to post a question like this.

I am seeking a stepper motor driver. The spec is 0.95A and I'm using a 12V 5A power supply. The reason I'm using this is because I have other devices that require 12V. I found the `Adafruit DRV8833 DC/Stepper Motor Driver Breakout Board` that seem to suit my application. However, I was wondering if this board is safe to power with a 12V. My stepper motor operates around 2-3V @ 1A. The stepper motor driver states to use below 10.8V motor power. Is this 10.8V referencing the supply voltage or the voltage that the motor is operating?


https://www.adafruit.com/product/3297

lh1
 
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Re: Adafruit DRV8833 DC/Stepper Motor Driver Breakout Board

by adafruit_support_bill on Wed Jun 23, 2021 8:19 pm

10.8 is the maximum recommended supply voltage for the chip.

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Re: Adafruit DRV8833 DC/Stepper Motor Driver Breakout Board

by lh1 on Thu Jun 24, 2021 4:07 am

So would this be more suitable?

https://www.adafruit.com/product/2448

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Re: Adafruit DRV8833 DC/Stepper Motor Driver Breakout Board

by adafruit_support_bill on Thu Jun 24, 2021 5:55 am

The TB6612 does not have current limiting, so we'd need to know the electrical specs of the motor to determine if it would be compatible. If powering with 12v, your motor would need to have a phase resistance of 10 ohms or more. https://learn.adafruit.com/all-about-st ... he-stepper

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Re: Adafruit DRV8833 DC/Stepper Motor Driver Breakout Board

by lh1 on Thu Jun 24, 2021 1:56 pm

Hello,

This is the motor (https://www.amazon.com/FUYU-Linear-Actu ... 595&sr=8-3) that I'm using. It has a rated current 0.95A and phase resistance of 2-3 ohms. I was initially using the adafruit DC and stepper motor HAT (https://learn.adafruit.com/adafruit-dc- ... spberry-pi) but when I supplied 12V, the chip became too hot. Because this motor drew around 1A at 2-3V, it makes sense that it drew a lot of current when drawing 12V. Therefore, I am in need of a stepper driver that can be supplied with 12V and limits the current.

If I were to use this stepper driver (https://www.adafruit.com/product/3190?g ... ukQAvD_BwE), will it draw I=V/R= 12/2=6A but then limit to 2A?

lh1
 
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Re: Adafruit DRV8833 DC/Stepper Motor Driver Breakout Board

by adafruit_support_bill on Thu Jun 24, 2021 3:53 pm

The DRV8871 has adjustable current limiting. Our breakout ships with a 32 K-ohm resistor for a 2A limit. To limit at 1A, replace that with a 64-K-ohm resistor.

See section 7.3.3 of the datasheet for details: https://cdn-shop.adafruit.com/product-f ... rv8871.pdf

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