The High Efficiency Joint 90 (HEJ 90) from maxon is a fully integrated robotic joint designed specifically for dynamic, field‑deployed robotics. Rather than assembling motors, gearboxes, sensors and controllers as discrete components, the HEJ 90 integrates all subsystems into a single, compact, sealed unit optimized for continuous operation. At the core of the HEJ 90 is a high‑efficiency inrunner motor paired with a robust planetary gearbox and integrated power electronics. The result is a joint capable of delivering up to 140 Nm of actively controlled torque with joint speeds reaching 13 rad/s, while maintaining high overall system efficiency. This efficiency directly reduces thermal load - one of the limiting factors in legged and mobile robots operating near nominal torque for extended periods. The HEJ 90 is controlled via EtherCAT and supports multiple internal control topologies, allowing it to adapt to a wide range of robotic architectures. maxon, maxongroup.us, Booth 231
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