Electronics > Beginners
Stepper Motor Selection
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Brumby:
This is intriguing.  If I may ask - what is the application?
Nusa:
For prototyping at least, I'd suggest a belt-driven setup rather than direct drive. Then you are in a position to change the mechanical advantage of the motor simply by changing pulley sizes.
jismal:
Its a vertical scanner. I think i need to game up my mechanics
beanflying:
With that diameter wheel and speed changing at a minimum you need to use gear or belt reduction to get more torque at the shaft. So your wheel now need to be on its own shaft supported at both ends with bearings.

Without checking a specific model Nema 17's will run at a few hundred RPM but 6 up to maybe 10 to 1 is possible without to much fuss in a single reduction so you multiply (rough but simple) the torque by the reduction. This gets you in the order of 2-4Nm (Nema 23 is about double this) depending on motor choice, reduction and layout.

You will then need to run at least some rough numbers on how fast you need to get to or from your 10RPM (or from Xrpm to Yrpm) to set the driver properly to avoid missed steps or overloading your system. If you can't meet your acceleration needs then you need to look at a larger motor and run the numbers again.

Brumby:

--- Quote from: jismal on December 16, 2018, 03:27:12 am ---Its a vertical scanner. I think i need to game up my mechanics

--- End quote ---

Yeah - so do I.

My biggest concern was the direct drive approach.  As suggested above, changing to a belt drive setup on the rim or with a large pulley will give you much better mechanical advantage - and you will be able to drive the stepper in the operating area that is better matched to its strengths.
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