Amperage Rating for Nema 17 Stepper Motors

Controllers Smoothie
1

So, I bought four 2A/phase, 4.5Nm Nema 17 Steppers. Will a 2A/phase current draw be ok on the Smoothieboard 4x? What does “per phase” even mean? If I go down to say, 1.8amps in the software, will the torque provided be enough to power a bowden delta 3D printer?

Here are the stepper specs:

Manufacturer Part Number 17HS16-2004S1
Motor Type Bipolar Stepper
Step Angle 1.8°
Holding Torque 45Ncm(63.7oz.in)
Rated Current/phase 2A
Phase Resistance 1.1ohms
Recommended Voltage 12-24V
Inductance 2.6mH±20%(1KHz)
Physical Specification
Frame Size 42 x 42mm
Body Length 40mm
Shaft Diameter Φ5mm
Shaft Length 23mm
D-cut Length 21mm
Number of Leads 4
Lead Length 1000mm
Weight 310g

I’m currently planning on using a 12V, 400W power supply.

Thanks!

Imported from wikidot

2

Hey.

2A per phase means 2A, pretty much.

Smoothie can handle up to 2A, but might require some heavy cooling at that value. I generally use 1.8A with 2A motors, and aim a fan at the board. You only loose a tiny bit of torque, it should be perfectly fine for an extruder.

Cheers.

3

Thanks Arthur! Really appreciate the response. I’ll try it at 1.8amps with some cooling and see if I’m getting enough torque.

Regards,

Leo