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HEJ 90 High‑Efficiency Joint for Mobile Robots
SKU
hej90-series
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
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
