The HEJ 90 combines a brushless motor, precision gearbox, encoder, servo drive, and thermal monitoring into a sealed joint assembly, reducing system complexity while delivering high torque density and energy efficiency for battery-powered robots.

Vaughan, Ontario — [January 5, 2026] — Electromate Inc., a Canadian supplier of precision motion-control and robotic components, has announced the availability of the maxon HEJ 90 High-Efficiency Joint, a compact, integrated actuator designed for high-torque joints in mobile and legged robotic systems.

The HEJ 90 combines a brushless motor, precision gearbox, encoder, servo drive, and thermal monitoring into a sealed joint assembly, reducing system complexity while delivering high torque density and energy efficiency for battery-powered robots.

Designed for High-Performance Mobile Robotics
The HEJ 90 delivers up to 140 Nm of peak torque, with configurable options extending to 180 Nm peak torque, while supporting joint speeds up to 13 rad/s. With efficiencies reaching 86 percent, the joint minimizes power losses and heat generation, extending the operating time of autonomous mobile platforms.

The joint's compact footprint (110 mm diameter, 90 mm length) and mass of approximately 1.96 kg make it suitable for space-constrained designs such as quadruped robots, humanoid joints, mobile manipulators, and propulsion or steering joints in wheeled and tracked robots.

Integrated Architecture Simplifies System Design
By integrating motor control electronics directly into the joint, the HEJ 90 eliminates the need for external servo drives and reduces wiring and cabinet space. The joint supports EtherCAT communication with real-time control at up to 1 kHz, enabling precise torque, velocity, and position control.

Dual EtherCAT ports support daisy-chain configurations, simplifying multi-axis robot architectures. Absolute position feedback and low-backlash mechanical design support accurate motion control and force-based interaction in dynamic environments.

Built for Real-World Operating Conditions
The HEJ 90 is rated IP67, allowing operation in dusty, wet, and outdoor environments commonly encountered in mobile robotics. Integrated thermal monitoring and optional active cooling support sustained operation under high loads and demanding duty cycles.

Availability
The HEJ 90 High-Efficiency Joint is now available through Electromate. Configuration support, technical documentation, and application guidance are provided for OEMs and system integrators developing mobile robotic platforms.

Learn more at https://www.electromate.com/hej-90-high-efficiency-joint-for-mobile-robots/

About Electromate Inc.
Electromate Inc. supplies precision motion-control, mechatronic, and robotic components to manufacturers and integrators across Canada. The company supports applications ranging from mobile robotics and automation to medical, aerospace, and advanced industrial systems.