How should the shielding overlap of an industrial servo connector be designed?

The shielding overlap design of servo system connectors (such as motors, encoders, and communication interfaces) is a crucial aspect of ensuring shielding continuity. Key design considerations for Audiotech Electronics include: selecting shielded connectors with metal housings (such as D-sub, M12, and aviation plugs). The connector housing should achieve a 360-degree low-impedance overlap with the equipment housing, typically achieved by pressing multiple screws (with serrated washers) around the connector mounting flange into the housing opening, ensuring the conductive paint or plating on the contact surface remains intact.

For PCB-mounted connectors, the metal housing should be connected to the PCB's shielding ground plane through multiple vias (at least four), which in turn connects to the housing at multiple points. The cable-side shielding layer should be reliably connected to the connector's rear shell via crimping or soldering, again ensuring 360-degree contact. A well-designed overlap design should have an overlap impedance of <5mΩ at 30MHz, maintaining over 90% of the cable's shielding effectiveness and preventing the connection point from becoming a radiation leakage point.