How should the spacing between industrial servo power lines and signal lines be set?

The spacing between servo power lines (motor lines, busbars) and signal lines (control, feedback) is crucial for reducing inductive coupling. Audiotech's spacing guidelines recommend that on a PCB, the edge distance between the two should be at least 10 times the wire diameter; for example, for a 2mm wide power line, the spacing should be >20mm. If space is limited, a grounded protective trace can be inserted in between, or a power plane can be used for isolation. In cabinet wiring harnesses, the two types of cables should be placed in separate metal cable trays, or cable trays with metal partitions should be used.

The minimum recommended spacing for parallel traces is: for low-voltage signal lines (<24V), the distance from motor power lines should be >30cm; for medium-voltage signal lines, the distance should be >50cm. If crossing is unavoidable, the crossing should be perpendicular. By increasing the spacing and using twisted-pair shielded cable (with the shield grounded) for signal lines, the induced voltage of power line switching noise on the signal lines can be reduced to below 10mV, effectively preventing false triggering or sampling errors.