DC & Stepper Motor HAT Blinking Power Light

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JJMoney
 
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DC & Stepper Motor HAT Blinking Power Light

Post by JJMoney »

I recently bought a new, more powerful stepper motor (see its datasheet here) to control through the DC & Stepper Motor HAT. I notice that when the motor is connected, the power LED light on the HAT starts to blink. Trying to control the motor results in very choppy movements.

The same setup worked with a weaker stepper motor. See the attached picture for the specs of my power supply (12V, 2A). I am wondering if I can have help with determining why the new stepper motor is causing issues. Is my new stepper motor trying to draw too much power? If so, how can I use a motor this powerful with the raspberry pi? Any help would be greatly appreciated.
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dastels
 
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Re: DC & Stepper Motor HAT Blinking Power Light

Post by dastels »

The motor datasheet states 1.68A and the motor hat can supply 1.2A. That's likely the problem.

Dave

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JJMoney
 
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Re: DC & Stepper Motor HAT Blinking Power Light

Post by JJMoney »

dastels wrote: Tue Dec 20, 2022 10:45 pm The motor datasheet states 1.68A and the motor hat can supply 1.2A. That's likely the problem.

Dave
That makes sense. Are there any ways you can recommend to power this motor from a RPi?

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adafruit_support_bill
 
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Re: DC & Stepper Motor HAT Blinking Power Light

Post by adafruit_support_bill »

Based on the spec sheet, that motor was clearly designed for use with a current-limiting 'chopper' type driver. We do have the DRV8833, but to achieve the torque ratings in the spec, you will need one with a higher current capability. Check with www.pololu.com. They carry a wide range of current limiting stepper driver boards.

https://learn.adafruit.com/all-about-st ... he-stepper

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JJMoney
 
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Re: DC & Stepper Motor HAT Blinking Power Light

Post by JJMoney »

adafruit_support_bill wrote: Wed Dec 21, 2022 7:28 am Based on the spec sheet, that motor was clearly designed for use with a current-limiting 'chopper' type driver. We do have the DRV8833, but to achieve the torque ratings in the spec, you will need one with a higher current capability. Check with www.pololu.com. They carry a wide range of current limiting stepper driver boards.

https://learn.adafruit.com/all-about-st ... he-stepper
I see. That makes sense. Would something like this be adequate and compatible with my setup? I notice the word "carrier", but I'm not 100% sure what that means.

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adafruit_support_bill
 
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Re: DC & Stepper Motor HAT Blinking Power Light

Post by adafruit_support_bill »

'carrier' in Pololu terminology is basically the same thing as what we call a 'breakout board'. It has the chip and essential support circuitry mounted on a small board with solder holes or header pins for easy connection.

The DRV8825 would be suitable - although I would recommend adding a heat-sink to the chip if you plan to run the motors at a full 1.68A.

There is also the TB67S249FTG or AMIS-30543 which will handle up to 1.7A or 1.8A respectively with no additional heat-sinking.
https://www.pololu.com/product/2973
https://www.pololu.com/product/2970

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