Maxon has launched the High Efficiency Joint (HEJ) 70-48-50 drive. This advanced actuator caters specifically to autonomous mobile robots operating in unstructured environments such as humanoids, quadrupeds, exoskeletons or mobile manipulators. The HEJ 70-48-50 delivers a peak torque of 50 Nm and reaches speeds up to 28 rad/s, all while maintaining a mass just above 1 kg. Maxon's High Efficiency Joints combine torque-dense electric motors, planetary gears, electronics, sensing and support structures into highly compact, IP67-rated and EtherCAT-controlled robotic actuators. The control system can be configured flexibly and supports various topologies for impedance control of the joint.