Integrated joint actuator serves mobile and manipulation robots
Sept. 9, 2025
Related To:
HEJ 70 compact, integrated robotic joint actuator is engineered to meet the performance needs of mobile and manipulation robots. Its HEJ 70 48 50 model combines a torque-dense motor, planetary gearbox, 14-bit absolute encoder with < 0.6° error, and EtherCAT control electronics in a sealed, IP67-rated package. It delivers a peak torque of ±50 Nm and a maximum joint speed of 28 rad/s, with efficiencies up to 74% at 12 Nm and 26 rad/s. The actuator's compact design (1.05 kg) and high performance make it suitable for lightweight robotic applications.
HEJ 70 also features:
- 30-60 VDC voltage range
- Control interface for EtherCAT (daisy-chain), PWM fan control, 1 kHz cycle rate and PDO-mapped gains
- Current-based, ± 0.8 Nm accuracy torque sensing
- Approximately 0.5 Nm back-drive torque
- Cross-roller output bearing
- Continuous torque of ±19 Nm at 2 rad/s without extra cooling
- Approximately 72% generator efficiency
- High-cycle fatigue design with 12 million impacts at 38 Nm, 100 k at 50 Nm
- More than 56,000 hours at 10 Nm, 22 rad/s expected operating life
