# Proper Amount To Twist Stepper Motor Wires

Posted by Garry Bartsch
 Proper Amount To Twist Stepper Motor Wires September 25, 2013 06:25PM Registered: 9 years ago Posts: 363
I've searched for the proper amount to twist stepper motor wires but haven't found a definitive answer. So I went ahead and twisted two wires together this much. Is this enough or should I twist them more? Thanks.

Edited 1 time(s). Last edit at 09/25/2013 06:26PM by Garry Bartsch.
 Re: Proper Amount To Twist Stepper Motor Wires September 27, 2013 07:07AM Admin Registered: 15 years ago Posts: 7,871
It looks fine to me. I don't think there is anything critical about it.

[www.hydraraptor.blogspot.com]
 Re: Proper Amount To Twist Stepper Motor Wires September 28, 2013 04:31PM Registered: 9 years ago Posts: 363
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> I don't think there is

Thank you Chris. I didn't check "Follow Topic" so didn't receive your response - sorry. Before I found your response here I twisted them a bit more but since you comment there isnâ€™t anything critical about it I will assume all is fine with the amount I settled on.

One other thing I noticed that hopefully fits into the "nothing to critical" category is I found it difficult to twist any two pairs or wire so that the tightness is uniform over the entire length.
 Re: Proper Amount To Twist Stepper Motor Wires September 28, 2013 07:05PM Admin Registered: 15 years ago Posts: 7,871
When I twist them with a drill they are pretty uniform. However it won't make much difference if they aren't.

The theory is a loop of wire will transmit electromagnetic noise proportional to its area, When two wires run parallel the enclosed area is small but still finite. When they are twisted each half turn emits an opposite signal to the next so when taken from a certain distance they cancel out. My guess would be with tighter twists you can get closer to the wire before you start to lose the cancelling effect by being closer to one half turn than the surrounding ones.

Since EMC regs measure at ~3m IIRC then I think it won't make much difference how big the twists are as long as they are small compared to 3m. You would only notice perhaps with a close field probe.

[www.hydraraptor.blogspot.com]
 Re: Proper Amount To Twist Stepper Motor Wires September 28, 2013 08:41PM Registered: 9 years ago Posts: 363
Great information. Thank you Chris.

When I say they are not entirely uniform I mean they are not 'perfect'. Maybe I was expecting too much precision was required. After reading your explanation I'm sure all is fine with what I have done here.
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