Why do industrial robots require specialized cables?

2026-03-09 16:29:07

In the world of industrial robots, cables are often referred to as the "neural bloodline" - they carry motor power, encoder feedback, sensor signals, visual transmission, and even real-time communication bus data. However, many factories habitually use ordinary BV wires, RV flexible wires, and even home decoration cables as "temporary replacements" during production line upgrades, resulting in skin cracking, core wire breakage, signal loss, and robot positioning drift in just a few months.

To understand the necessity of specialized cables, it is necessary to first see to what extent industrial robots have "tortured" the cables.

During the operation of the joints of a six axis industrial robot, the cables must simultaneously withstand:

High frequency reciprocating bending: The cable inside the drag chain moves back and forth at a speed of 2-5m/s, bending dozens of times per minute

Three dimensional composite torsion: The cables inside the robot arm can withstand torsional deformation of ± 180 °/m or even ± 360 °/m

Continuous stretching and compression: During the movement of the drag chain, the cable is subjected to alternating tension inside, and the conductor is repeatedly stretched and compressed

Strong electromagnetic interference environment: complex electromagnetic noise around servo drives, frequency converters, and switching power supplies

Oil pollution, cutting fluid, dust invasion: harsh industrial site environment

Under such working conditions, the bending life of ordinary RV soft wire or BV hard wire is usually only tens of thousands of times. Based on a robot working 20 hours a day and bending 30 times per minute, ordinary cables will experience core breakage within 3-5 days. The economic loss of an industrial robot production line shutdown for one hour often amounts to tens of thousands of yuan - this is the fundamental reason why industrial robots must use dedicated cables.