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07-29-2014, 10:01 AM #1
MakerFarm Prusa i3 and i3v 66 oz. in. Stepper Motor Specifications
I finally tracked down specifications for the 66 oz. in. motors that Colin sells and includes in the MakerFarm i3 and i3v kits. It looks like they're not actually the same motors that Circuit Specialists sells (as I have suggested in other threads) but their characteristics are similar: around 18 ohms DC resistance and 35mH inductance.
Specifications from Colin:
MakerFarm Motors.jpg
And direct measurement:
2014-07-29 08.20.37.jpg
The 35mH inductance is accurate, but you can ignore the series resistance value. This meter is attempting to estimate DC resistance from phase angle measurements, and it's out in the corners where it isn't very accurate. The 18.5 ohms I measured with a DC multimeter is more accurate and matches the spec sheet.
Printer will print perfect...
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