How to reduce coupling in inverter wiring harness routing

Optimizing the routing of wiring harnesses inside and outside the inverter cabinet is a crucial means of reducing inter-wire coupling interference. Wiring harness routing principles include: separating strong and weak current cables, placing power cables (input power, motor cables) separately from control and signal cables in different cable trays or cable management systems, maintaining a distance of at least 20cm. If parallel routing is unavoidable, the spacing should be as large as possible, avoiding long parallel runs. If crossing, cross perpendicularly whenever possible. Separate high and low speed signals, bundling analog signals, communication buses, and other signal lines with different characteristics separately.

Wiring harnesses should be routed as close as possible to the metal cabinet walls or ground plane to utilize the mirror effect to reduce radiative coupling. Wiring harnesses should avoid forming large loops, and wiring paths should be simple. Wiring inside the cabinet should be neat, fixed, and free of clutter. For harnesses that must be close together, metal partitions can be added in between. When routing externally, inverter output motor cables should be kept away from other cables, especially network cables and sensor cables. Scanning the spatial field strength near the wiring harness with a near-field probe can assess coupling and optimize routing. Proper wiring harness routing planning, combined with Eintraelectronics' shielding and filtering products, can significantly reduce EMC problems caused by cable coupling.