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### Topic: Bipolar Stepper Motor, Does polarity matter? (Read 3745 times)previous topic - next topic

#### Cue2

##### Dec 31, 2012, 03:21 pm
I have an Easy Driver and a 4 wire bipolar stepper. I was wondering if the polarity of the AA, BB connections matter.
What I mean by that, say I had four wires A1 A2 B1 B2

would switching A1 and A2 have any effect?

#### johnwasser

#1
##### Dec 31, 2012, 06:08 pm
Swapping the ends of one winding will either stop the stepper from working or will change the direction of motion. I'm not sure which.
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#### dc42

#2
##### Dec 31, 2012, 06:55 pm
It will reverse the direction of motion.
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#### Grumpy_Mike

#3
##### Dec 31, 2012, 10:15 pm
Read this on why the order of the motor excitation matters:-
http://www.thebox.myzen.co.uk/Workshop/Motors_4.html

#### imrobc

#4
##### Jan 01, 2013, 02:35 am
Sure does, it matters in terms of direction.

So when setting up a mill or lathe you'll figure things out, just start in the middle of any axis that way you have travel in either direction to work with, once you decide what direction you want the axis to move on, "based on polarity", keep the wiring.

Half the fun in this stuff is problem solving, like you would with a mutli-piece puzzle.
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#### Cue2

#5
##### Jan 01, 2013, 01:44 pm
Thanks for the explanation everyone. That makes sense since the phase shift would be equal but opposite when the wires are switched.

Could I also ask, would this be true for any 2 phase motor, even 2-2 phase unipolar motors in bipolar mode?

#### kf2qd

#6
##### Jan 02, 2013, 05:19 pm
In Bipolar mode, for any bipolar motor, swapping any pair of leads will reverse the rotation. (meaning A+, A- or B+ B-)

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