Adafruit motor hat #2348 power input

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JimGig
 
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Adafruit motor hat #2348 power input

Post by JimGig »

I have the #2348 motor hat connected to a Raspberry Pi (RPi) via the 20pin header.
I plan to run 1 stepper motor from the motor hat.
Currently, I have the RPi powered via a battery bank.
Question: Is it ok to power the motor hat using power from the RPi, supplied via the 20 pin header, or do I need two PS: one for the RPi and one for the motor hat?
The motor I plan to use draws only .4A/9.6vdc.
Motor hat supplies 1.2A nominal.

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adafruit_support_bill
 
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Re: Adafruit motor hat #2348 power input

Post by adafruit_support_bill »

The motor I plan to use draws only .4A/9.6vdc.
We'd need to see the full motor spec. The current rating is most likely a 'per phase' rating. So you will need to double it. And both that and the voltage rating are pretty meaningless without knowing the phase resistance. If you post a link to the complete motor specs we can determine what is required to drive it.
Motor hat supplies 1.2A nominal.
The HAT has no control over the current. The current draw is determined by the load (i.e. your motor). 1.2A per phase is the maximum continuous load that the HAT can tolerate.
https://learn.adafruit.com/all-about-st ... he-stepper

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JimGig
 
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Re: Adafruit motor hat #2348 power input

Post by JimGig »

step motor specs link: https://www.anaheimautomation.com/produ ... =75&cID=19
PN: 17Y001S-LW4

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adafruit_support_bill
 
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Re: Adafruit motor hat #2348 power input

Post by adafruit_support_bill »

OK. With a phase resistance of 24 ohms, the DC current draw if powered by 5v from your battery bank will be 0.2A per phase or 0.4A total. Since it is a lower voltage than listed in the spec the max step rate and torque will be reduced by about 48%.

That motor is safe to use with the HAT. And your battery bank can probably supply that current, but it wold be better to deliver it directly to the power terminals on the HAT rather than relay it via the Pi.

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JimGig
 
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Re: Adafruit motor hat #2348 power input

Post by JimGig »

Related question:
When using the RPi to power the motor hat, I do not see the LED light ON (on the motor hat). When I supply vdc directly to the motor hat, the LED is ON.

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adafruit_support_bill
 
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Re: Adafruit motor hat #2348 power input

Post by adafruit_support_bill »

The RPi only powers the logic circuits on the HAT. To provide power to the motors (and illuminate the LED) you need to connect power to the screw-terminals on the HAT.

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JimGig
 
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Re: Adafruit motor hat #2348 power input

Post by JimGig »

Thank you.

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