Heidenhain ECA 4000 is a series of bearingless absolute angle encoders consisting of an optical ring scale and a separate scanning head. The bearingless design eliminates wear-induced errors and allows the scale to be mounted directly on the rotor shaft — removing backlash and enabling sub-arcsecond position control.
System accuracy is ±5″ (arcseconds), with internal interpolation providing up to 29-bit resolution per revolution. Inner bore diameters range from 70 mm up to more than 500 mm, making the encoder especially attractive for large robotic joints, rotary tables, gimbals, and machine tools.
The EnDat 2.2 digital interface (with optional Fanuc, Mitsubishi, and DRIVE-CLiQ variants) provides real-time communication with servo drives. The ECA 4000 supports functional safety (SIL2/SIL3 per IEC 61508) — a requirement for collaborative (cobot) and medical robotics.
In humanoid robotics and industrial arms, the Heidenhain ECA 4000 is deployed where trajectory repeatability is critical: robotic surgery, high-duty-cycle inspection robots, and CNC rotary tables.
serves as: Sensing, Precision Joint Motion.
Which group Heidenhain ECA 4000 Ring Encoder belongs to and how it is built
