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Topic: Stepper motor properties versus battery life (Read 656 times) previous topic - next topic

philip100

After building first prototype X axis, I believe I can win the battle :-D

This little setup can handle double of weight that I actually need. It can handle 5D mark IV + EF 70-200mm  + battery pack, up and down at 90 degrees.

The torque on idle (that came from pulleys reduction and belt friction) is enough to hold my weight at about 60 degrees, without powering up the motor.

The speed is more than enough for what this setup is designed.

No slop, no backslash caused by gearing :-)





luni64

Nice setup!  Regarding the "brake" at idle: I once did a project where I shortened the motor phases with a relay in idle mode. Depending on the motor this can brake steppers very effectively. You can easily try it by shortening the leads manually. 
Fast Stepper library? -> https://luni64.github.io/TeensyStep/

philip100

Thanks :-) it's just testing platform. I'm playing with steppers to choose optimal balance between power consumption and torque

Regarding the "brake" at idle: I once did a project where I shortened the motor phases with a relay in idle mode. Depending on the motor this can brake steppers very effectively. You can easily try it by shortening the leads manually.
Cool  :) I didn't try that before

philip100

#18
May 19, 2019, 08:06 pm Last Edit: May 19, 2019, 08:10 pm by philip100
Project done and am pretty much happy with the results  :)

With some serious reduction ratios, I could get steppers down to 0.5A / phase, so that single battery pack lasts for about 4,5h continous work.

Missing some screws and details (still in testing phase).

The best part of this project for me was the chellenge  :smiley-cool: I learned a lot.

http://www.youtube.com/watch?v=b5rIc90rhvA




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