How to ground the shielding of industrial servo motor cables?

Grounding the shielding layer of servo motor power cables (U/V/W/PE) is crucial for suppressing radiated emissions. Eintraelectronics grounding specifications require the use of motor-specific cables with a copper braided shielding layer (coverage >85%). The shielding layer should be grounded 360 degrees at both the servo drive and motor ends. At the drive end, the shielding layer is connected to the drive's metal housing (PE) via the metal shell of the shielded connector or a crimp-type shielding clip. At the motor end, the shielding layer is reliably connected to the motor housing via the grounding terminal in the motor junction box.

It is critical to ensure low impedance and continuity at the connection point, with a contact resistance <5mΩ. For long-distance or high-frequency applications, additional ferrite cores (PBZ series) can be added to both ends of the cable. Grounding at both ends can reduce radiated emissions from the motor cable in the 30-100MHz range by 15-25dB. Note that if the drive and motor are mounted on the same metal base, this grounding method will not introduce low-frequency ground loop problems.