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HEJ 70 High-Efficiency Joint for Mobile Robots
SKU
hej70-series
The HEJ 70‑48‑50 is a compact, fully integrated robotic actuator combining torque-dense motor, planetary gearbox, control electronics, and sensing into a sealed, IP67-rated package. It delivers a 50 Nm peak torque and a top speed of 28 rad/s with high efficiency—ideal for lightweight, mobile manipulation systems.
Key Specifications:
| Parameter | HEJ 70‑48‑50 |
|---|---|
| Peak Torque | ± 50 Nm (future variants may exceed 60 Nm) |
| Max Joint Speed | 28 rad/s @ 60 V | 22 rad/s @ 48 V |
| Mass | 1.05 kg |
| Efficiency | Up to 74% (measured at 12 Nm, 26 rad/s) |
| Ingress Protection | IP67 (sealed against dust and water) |
| Voltage Range | 30–60 V DC |
| Control Interfaces | EtherCAT (daisy-chain), PWM fan control, 1 kHz cycle rate, PDO-mapped gains |
| Position Sensor | 14-bit absolute encoder, < 0.6° error |
| Torque Sensing | Current-based, ± 0.8 Nm accuracy |
| Backdrive Torque | ~0.5 Nm |
| Output Bearing | Cross-roller bearing |
| Average Backlash |
Performance & Reliability:
- Continuous torque: ± 19 Nm at 2 rad/s without extra cooling
- Efficiency peak: ~74% at 12 Nm & 26 rad/s; generator efficiency reaches ~72%
- Designed for high cycle fatigue: 12 million impacts at 38 Nm, 100k at 50 Nm
- Operating life examples: over 56,000 h at 10 Nm, 22 rad/s
Use Cases:
- Autonomous mobile manipulators and cobots
- Lightweight robotic arms and grippers
- Quadruped and biped robots
- End-effector joints, compact SCARA joints, and wearable robotics
Integration Highlights:
- Ready-to-use with onboard control electronics, torque & position sensing, and active cooling system
- Simplified system architecture using EtherCAT daisy-chain; reduces external cabling
- Includes simulation models for design verification and sizing
Compact 50 Nm robotic joint actuator with integrated motor, gearbox, encoder, and EtherCAT control. Sealed IP67 design ideal for mobile manipulation. RFQ available in Canada.
Sample image only. Product may differ
