darmach's blog

tech junkie

Steppers arrived!

After 2 weeks of waiting, stepper motors arrived. I have chosen NEMA17 7HS4401 stepper motors, here are these pretties:

And the specs are:

Model Step Angle Motor Length Rated Current Phase Resistance Phase Inductance Holding Torque Detent Torque Rotor Inertia
(deg) (mm) (A) (Ohm) (mH) (N.cm) (N.cm) (g.cm2)
17HS4401 1.8 40 1.7 1.5 2.8 40 2.2 54

I can’t wait to power them up, but drivers didn’t arrive yet. Official RepRap wiki article about stepper motors claims that 13.7 N·cm torque should be enough, but just to be safe I decided to go with 40 N·cm. I hope they will deliver .)

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