PWM Signal Noise?

[Danny Diaz]

I have been thinking about the wiring design for Victor speed controllers lately (and sensors as well), and I was wondering about the effects of DC EMI on the PWM signals and on any analog sensors we might have on the robot. It appears to be quite common to run the PWM wires intended for driving the Victors in parallel with the DC power lines to Victors in a "wiring harness", especially when attempting to make the wiring on the robot as clean as possible. I have seen a couple threads on this board about having interference with camera servos when the PWM leads get too close to FP motors, but couldn't you have similar problems with the PWM signals going to the Victors when the motors are pulling quite a bit of current? I understand that the effect is greater over greater distances, but I would have figured this would be a bigger problem/concern than it appears to be. Is it, and why/why not?

Thanks!
-Danny