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Home / All / Robot Joint Motor / Shoulder Joint Motor / Shoulder Joint Motor SLJ20 Ultra-Lightweight
Shoulder Joint Motor SLJ20 Ultra-Lightweight
Detail Information
SLJ20 Ultra-Lightweight Integrated Harmonic Joint
The SLJ20 is an ultralight integrated joint module designed for humanoid robots, collaborative robotic arms, exoskeletons, quadruped robots, and other high-precision motion-control equipment.
Its compact architecture integrates a servo motor, harmonic reducer, dual high-resolution encoders, servo drive, communication interfaces, and a gear-engagement electromagnetic brake. Weighing approximately 0.98 kg and rated at 160 W, the SLJ20 is available with reduction ratios of 50:1, 80:1, 100:1, and 120:1, combining lightweight construction with high torque, precise positioning, and efficient system integration.
The SLJ20 supports EtherCAT, CAN, and CAN FD communication, meeting the requirements of real-time multi-axis control, rapid response, and status feedback. It provides a standardized joint actuation platform for robot development, system integration, and volume production.
Product Advantages
Ultralight Integrated Design
The joint module weighs approximately 0.98 kg. Its highly integrated design reduces external components, wiring, and installation space, helping minimize overall robot weight and joint inertia.
Up to 189 N·m Instantaneous Torque
Depending on the reduction ratio, the SLJ20 provides rated torque from 33 to 52 N·m, start-stop peak torque from 73 to 113 N·m, and instantaneous maximum torque of up to 189 N·m.
This wide torque range supports joint acceleration, braking, position holding, and short-duration high-load movements.
Multiple Harmonic Reduction Ratios
Reduction ratios of 50:1, 80:1, 100:1, and 120:1 are available. Users can select the appropriate configuration according to joint speed, output torque, and positioning requirements for different robot axes.
Dual 19-Bit Absolute Encoders
The motor input and joint output sides are both equipped with 19-bit absolute encoders. This enables simultaneous monitoring of motor-side and output-side positions, providing reliable feedback for closed-loop control, reducer error compensation, and high-precision motion control.
The battery-free encoder design reduces maintenance requirements and improves long-term operational convenience.
1 Arc-Minute Repeatability
With repeatability of 1 arc minute, the SLJ20 meets the joint-position consistency requirements of collaborative robots, humanoid robots, and precision automation equipment.
Multiple Industrial Communication Interfaces
EtherCAT, CAN, and CAN FD communication options enable straightforward integration with robot controllers and real-time multi-axis control systems. Available protocols and interface configurations depend on the complete ordering code.
Technical Specifications
ParameterValue
ModelSLJ20
Winding MethodY (Star)
Voltage Range48 VDC
Rated Torque33N·m
Peak Torque73N·m
Gear Ratio50:1
Encoder Resolution19-Bit
CommunicationCAN Bus
Protection RatingIP54
Weight (with driver)~980g
Repeatability1 arcmin
Noise< 60 dB
Working Temperature-20 ~ +80 °C
Dual Encoder SupportYes (Output Shaft)
Custom Brake SupportYes
Key Applications
Humanoid Robots
Joint actuation for bipedal and full-body humanoid platforms
Collaborative Robots
Safe, precise motion for cobot arms and grippers
Exoskeletons
Power assist and rehabilitation exoskeleton systems
Education & Research
Robotics labs, university projects, and prototyping
Medical Assistants
Surgical robots and rehabilitation equipment
Smart Automation
Automated guided vehicles and smart manufacturing
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