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HEJ 90 High‑Efficiency Joint for Mobile Robots
SKU
hej90-series
High-torque 140 Nm robotic joint actuator with integrated drive electronics and EtherCAT interface. IP67-rated for demanding mobile and locomotion applications.
Sample image only. Product may differ
The HEJ 90 is maxon’s high‑torque, fully integrated joint actuator designed for mobile and locomotion robotics. It combines motor, gearbox, encoder, controller, and thermal management in a compact, sealed package rated for IP67 environments. With peak torque up to 140 Nm (customizable to 180 Nm) and smooth EtherCAT control, it's ideal for rugged outdoor or field applications .
Key Specifications:
| Parameter | HEJ 90‑48‑140 |
|---|---|
| Peak Torque | 140 Nm (up to 180 Nm custom) |
| Max Joint Speed | 13 rad/s |
| Dimensions (Ø × L) | 110 mm × 90 mm |
| Mass | 1.96 kg |
| Efficiency | Up to 86 % |
| Ingress Protection | IP67 (sealed under bending loads) |
| Voltage Range | 30–60 V DC |
| Control Interface | Dual EtherCAT, 1 kHz control, torque/velocity/position/impedance modes |
| Position Encoder | Absolute, integrated |
| Output Bearing | Cross-roller bearing |
Performance and Reliability:
- Designed for high-torque robotic joints in mobile or field robotics
- Sealed IP67 housing allows operation in wet or dirty environments
- High-efficiency design minimizes battery drain on mobile platforms
- Cross-roller output bearing supports large axial and radial loads
- Optional active cooling enables extended duty cycles under load
- Internal thermal monitoring and fan control protect against overheating
- Control loop runs at 1 kHz, supporting real-time torque, velocity, and position control
Use Cases:
The HEJ 90 is suited for a wide range of robotic systems, including:
- Legged robots with heavy payload requirements (quadrupeds, humanoids)
- Autonomous mobile manipulators
- Hip, knee, and base joints in walking robots
- Propulsion joints for field-deployed tracked or wheeled robots
- Outdoor robotics requiring sealed, rugged actuator modules
Integration Highlights:
- All-in-one actuator simplifies system architecture—no external drives or sensors needed
- Dual EtherCAT ports support daisy-chaining in multi-joint setups
- Position feedback via absolute encoder with integrated torque estimation
- Simulation models and documentation available for sizing and control development
- Low backlash and minimal backdrive torque support stable force control
- Electromate offers full support from selection to deployment
