Unipolar Stepper HELP!!

Other Hardware Motors, Mechanics, Power and CNC
1

Hi All,

I've got a geared unipolar (2 phase) with the published spec listed below. I am seeking guidance on how to go about driving it. I am using ULN2803. Should I be driving it at 60rpm with 200 steps per revolution (given 200pps) and just calculate the revolutions. The Stepper.h on UNO doesn't like 7200 steps nor 1.67rpm as speed. Thank you.

86 ohm
Step Angle: 15 degree
Gear Ratio: 300
Motion Speed: 1.67rpm (@200pps)
Torque: 150Ncm(@200pps)

2

What's wrong with initializing the stepper library with 7200 steps per revolution? It's an int it should fit.
For 60rpm you'd need 1 rotation per second, that's 7200Hz, it's probably too high.
Do some tests starting low (1 or 2 rpms) and increase slowly until the motor stalls.

3

Thanks for the response. I used AccelStepper and it worked flawlessly.