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Hey guys, could really use some help here. I have a stepper motor(second hand),but there was no color on every wiring and I have no idea how am I going to determine its wiring connection(for example : A+, A-,B+,B-). anyone ?
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Try powering each coil individually and see what's the correct order of movement.
For each coil powered, the movement should be 90º.
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Try powering each coil individually and see what's the correct order of movement.
For each coil powered, the movement should be 90º.

That's not really the "proper" way. It can work - you could also burn out your coils if you apply too much voltage, or you might get unlucky and short out your power supply if you connect a pair of common lines. Something to be aware of...

 smiley-wink

The proper way to determine the coils is to use an ohm meter to determine how the coils are connected (along with some diagrams).

First - ryanz - you didn't mention the number of wires from the stepper; 4, 5 and 6 wire steppers are fairly common, sometimes one of the "wires" can actually be the case of the stepper (so that 3 or 4 wire stepper might be a 4 or 5 wire stepper!).

You should first try to find a datasheet for the motor, if you can (got any pictures of the motor? Are there any labels on it?).

Then, based on what you find (or don't), you can break out your multimeter, set it to read (low) resistance, and get to work. These links will help:

http://www.thebox.myzen.co.uk/Workshop/Motors_3.html
http://www.thebox.myzen.co.uk/Workshop/Motors_4.html

http://digital.ni.com/public.nsf/allkb/0AEE7B9AD4B3E04186256ACE005D833B
http://www.stepperboard.com/MotorConnections.htm

http://www.probotix.com/manuals/SideStep_manual.htm

This last one is for a product, but this manual has a section (toward the bottom) on identifying wires/coils of a stepper. Hope this all helps - good luck!

 smiley
« Last Edit: January 15, 2011, 12:40:32 pm by keeper63@cox.net » Logged

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Thank you so much for your advice guys! really helps me..Sorry i forgot to mention how many wires it does have which is by the way has 6 wires , but no need to worry already cause I've got the motor working and turns out to have I think 1.8 degree turn(Clockwise Direction)and for the record, the Model was KH42HM2B058 Japan Servo Co. Ltd. 1.8 Deg/Step . I figured that the first pair was pins 2 and 3 and the seond pair was pins 4 and 5 so in conclusion, the remaining 2 pins(w/c are the pins 1 and 6) are likely to be the Common. Thumbs up! ;D smiley-wink smiley-grin smiley :smiley smiley-razz 8-)[/size]
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The proper way to determine the coils is to use an ohm meter to determine how the coils are connected (along with some diagrams).

Correct... sorry about that. I was also thinking that at least the voltage for teh stepper was known. My bad.

I did, however, forget the common lines. :\
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Correct... sorry about that. I was also thinking that at least the voltage for teh stepper was known. My bad.

You could probably get away with this on a 4-wire bipolar stepper, since none of the wires is common and there are only 2 coils - but only provided that you know the voltage for the coils and their current needs (and generally, if you know this, you probably have a spec sheet that says which wires are what).

Measuring the coil resistances is probably best; from there, you could get an idea of current needs for certain voltages, then experiment...
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