How to isolate the strong and weak current wiring of a motion controller MC?

Effective isolation of high-voltage and low-voltage wiring within the motion controller (MC) is fundamental to safety and reliability. Physically, clear partitioning is essential, with sufficient creepage distance and clearances maintained between high-voltage, high-current power areas and low-voltage sensitive signal areas. A copper-free isolation strip should be created between these two areas. Signals crossing this isolation strip must be transmitted through isolation devices such as optocouplers, isolated operational amplifiers, or digital isolators. Isolated power supplies utilize DC-DC modules whose primary and secondary sides meet isolation voltage requirements.

During wiring, high-voltage and low-voltage wires must not cross the isolation strip parallel or perpendicularly; they must cross perpendicularly. The ground plane also needs appropriate segmentation, with power ground and signal ground connected only at a single point (the power input filter capacitor) or completely isolated. In the PCB stack-up design, different areas can be placed on different layers. All isolation measures must be verified through withstand voltage and insulation resistance tests. This design effectively prevents high-voltage faults from affecting low-voltage circuits and suppresses conducted coupling interference.