View Full Version : Twisted wires from motors

12-21-2003, 12:31 AM
I just read where your supposed to twist the wires fro your stepper motor before they make their way into the controller card? What is hte purpose?


Steve Etter
12-21-2003, 09:35 AM
I can't say for sure without reading the article you did, but I do know about typical signal wires.

Single conductor, low voltage DC signal wires are prone to picking up electrical noise that can influence the signal. One way this can happen is by their being routed too closely to AC power wires. What happens is there is an EM field produced by the AC circuit and that field induces a current in the DC wire.

By twisting the wires together along their route, any EM field to which the wires are subjected will induce equal and opposite currents in the two wires. This, in turn, negates the effect.

I imagine this is the same for the stepper but I am not sure.


12-21-2003, 10:05 AM
Thanks Steve,
My electronics knowledge is limited to what I know about general house wiring.

Merry Christmas

12-21-2003, 11:01 AM
Neil, The reason for twisting Stepper or DC & AC servo power wiring is the magnetic radiation from one conductor tends to be cancelled out or neutralized by the opposing radiation of the adjacent conductor.

04-03-2014, 06:57 PM
Currently discussing this w/ EE's at work. The wire-to-wire induction is reduced but you have now turned your wires in to stronger inductors by twisting them. Stepper wires are for transmitting current pulses/signals to the motor coils. What happens to motor movement when you introduce more inductance to the circuit. Current pulses/signals will be delayed by the added inductance. Is it insignificant compared to the motor winding inductance. Will keep you informed...