Hi folks:
How to figure out steps, revolution, speed for unamed, unbranded stepper motor taken from scrap. this stepper freak me only I got from this is. EM-176B thats all but I have a bunch in the same situation but the stickers are lost or erased and thats I found.
BTW I'm e-waste junkie recycler and thats should be all here for the planet
How many wire come out of the motor? Can you measure the coil resistance? This post contains good info on steppers.
Google "how to identify steppers" for more info.
There is no way to tell anything from the pictures. You need to measure the resistances to figure out the coil wiring. That may not even be a stepper. A brushed DC motor with inbuilt encoder can have 6 wires.
How to figure out steps, revolution, speed
Almost all stepper motors have 200 steps-per-revolution (1.8 degrees per step). The speed depends on how fast you send the step-pulses up to the point where the motor can't keep-up.
I suppose you could try it at 12V, after measuring the resistance and calculating the current, using [u]Ohm's Law[/u] to make sure your power supply and driver can handle the current.
The difficulty is.... a 24V motor might run at 12V (etc.) but at reduced torque. So, you might not find the proper voltage... You'll only know if the voltage is too low to turn the motor, or too high if the motor burns-up.
taken from scrap.
Sometimes, 'One man's trash is another man's trash." 
