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What voltage specs for Nema17 on Ramps ?

Posted by Replace

Replace

What voltage specs for Nema17 on Ramps ?
January 01, 2015 09:48AM

Registered: 13 years ago
Posts: 861

When googling on E-bay, I see nema's for 12V , for 24V,
but i also see specs as rated voltage = 2Vdc or 4vdc and different...

How should I read that to put one on my ramps stepper with polulu ?

Thomas

www.3daybreaker.blogspot.com

Orca V4.4 rebuild to Ramps with Mk8 and E3D, as well as a Rostock Delta Mini and an OLO in backorder :-)

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dc42

Re: What voltage specs for Nema17 on Ramps ?
January 01, 2015 05:56PM

Registered: 10 years ago
Posts: 14,672

The pololu drivers are constant current. Look for stepper motors with a rated current of 1 to 1.5A per phase. The voltage at the rated current should be 4V or lower if you intend to use a 12V supply. If you are using larger than normal stepper motors and all the ones in that current range have a voltage drop of more than 4V at rated current, then drive the pololou drivers from 24V instead of 12V.

Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

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Replace

Re: What voltage specs for Nema17 on Ramps ?
January 01, 2015 06:36PM

Registered: 13 years ago
Posts: 861

I was considering these:

Nema

would that work, based on your calculations ?

Edited 1 time(s). Last edit at 01/01/2015 06:36PM by Replace.

www.3daybreaker.blogspot.com

Orca V4.4 rebuild to Ramps with Mk8 and E3D, as well as a Rostock Delta Mini and an OLO in backorder :-)

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dc42

Re: What voltage specs for Nema17 on Ramps ?
January 02, 2015 09:59AM

Registered: 10 years ago
Posts: 14,672

Quote
Replace
I was considering these:

Nema

would that work, based on your calculations ?

The 2.5A rated current is more than the Pololu drivers can supply. You would only get about half the rated torque of those motors, unless you used more powerful drivers.

Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].