Re: twisting motor cables

--- In CAD_CAM_EDM_DRO@y..., "ahlee1010" <ahlee1010@h...> wrote:

> Hi,
>
> One thing I learn from this list is that one should twist the motor
> cables to reduce inductance (and noise generation/pick-up?)
>
>

The twisted wire thing is based on the fact that noise and crosstalk
(to other parallel wires) on a pair of wires tend to cancel out when
wrapped in a "twist". This also helps in making the pair more noise
immune from external sources if the circuit is a "differential"
input. Just taking all the wires for a motor and twisting them
together will do little to cancel anything. The twist should be
a "pair" of wires. That means wires that make up a complete circuit
from a current perspective. The A set of wires (+ & - ) would be
twisted tightly together. The B set should be a seperate twist. It
is more important that any signal wires (step, direction, encoder
feedback) be either shielded or twisted or both. If you use shielded
then ground one end only of the wire.