Self-pulsing UIM24302 0-2A Phase Current Step Driver

Specifications

Nema 17 frame size miniature step driver

10-30VDC wide range power supply
0-2 amps per phase adjustable output current

16th fixed micro stepping

Self-pulsing step driver

Power on to drive your stepper motor

Estimating Stepper Motor Size:

"Pick the weight of the heaviest item you are pushing around. If it weighs 40lbs, use 40lbs. multiply it by the IPM [Inches Per Miniute] you want. Say that's 1,000 IPM. Divide the result by the magic number "531". The answer is 75.3 Watts".

Watts = IPM * Lbs / 531

or

Watts = torque (in in-oz) * RPM / 1351

Watts = amps * volts so you need a current and voltage rating that, when multiplied, reach more than your minimal required watts. In the example above, with a 75.3 watt power output requirement, you need a 4 amp motor driven at 24 volt motor or a 3 amp motor driven at 30 volt or ...

Here is that last line in a handy calculator with torque units conversion built in:

This is generally going to me a more accurate estimate of the motor required for a mill or other system where a lead screw is pulling a load because the additional friction and mass of the system that moves the load is also included when you measure the torque required to turn the screw.