A New Approach to Robotic Joint Position Feedback
As robotic systems continue to evolve toward higher precision, greater compactness, and increased functional density, motion feedback technologies must advance accordingly. RLS has introduced the AksIM-4™ Dual Concentric Encoder, an ultra-thin magnetic absolute encoder that combines motor-side and joint-side position measurement into a single integrated architecture.
By incorporating two independent absolute encoders within one coplanar design, the solution addresses one of the most persistent engineering challenges in robotic joints: obtaining accurate feedback from both the motor shaft and the final output position without requiring multiple encoder assemblies.
Reducing Mechanical Complexity Through Dual-Concentric Design
Traditional robotic joints typically rely on separate encoder systems positioned at different points in the drivetrain. One encoder monitors motor rotation, while another tracks the output position after gear reduction. Although effective, this configuration increases assembly complexity, wiring requirements, installation space, and overall system weight.
The AksIM-4™ Dual Concentric consolidates these functions into a single flat-ring encoder structure. This integration reduces component count and simplifies mechanical design while freeing valuable space inside increasingly compact robotic joints.
For robot manufacturers, the result is a cleaner architecture that can accelerate assembly, reduce bill-of-material costs, and improve long-term serviceability.
Supporting Compact and High-Density Robotic Platforms
The demand for smaller, lighter, and more capable robotic systems continues to grow across collaborative robotics, humanoid robots, medical devices, and precision automation equipment.
In these applications, every millimeter of available space matters. The encoder's ultra-thin profile allows engineers to integrate advanced sensing capabilities without sacrificing valuable volume inside the joint. This becomes especially important in designs where multiple sensors, power electronics, cooling channels, and communication interfaces must coexist within a limited footprint.
As robotic joints become increasingly intelligent, component consolidation is emerging as a critical design strategy.
Through-Bore Architecture Enhances System Integration
One of the distinguishing characteristics of the AksIM platform is its through-bore construction. The central opening allows cables, pneumatic tubing, cooling lines, fiber optics, or vision-system wiring to pass directly through the joint.
This capability simplifies cable routing and supports more streamlined robot designs. Instead of creating additional pathways around the motion system, engineers can utilize the encoder's central opening to maximize packaging efficiency while maintaining unrestricted rotational movement.
The approach is particularly beneficial in advanced robotic arms where internal cable management directly impacts reliability and maintenance requirements.
Absolute Magnetic Technology Delivers Reliable Position Information
Unlike optical encoder systems that depend on optical discs and clean operating environments, the AksIM-4™ utilizes magnetic sensing technology to provide absolute position feedback immediately after power-up.
The encoder eliminates the need for homing sequences and enables motion systems to determine position instantly following startup. This contributes to shorter commissioning times, faster recovery after power interruptions, and improved machine availability.
Magnetic sensing technology also offers greater resilience in demanding industrial environments where dust, oil contamination, moisture, vibration, and temperature variations can negatively affect optical solutions.
Why Integrated Feedback Architectures Matter
The robotics industry is experiencing a broader shift toward functional integration. Engineers are increasingly expected to deliver higher performance while reducing size, weight, power consumption, and assembly complexity.
Dual-feedback architectures integrated into a single sensing platform represent an important step in that direction. Rather than simply replacing existing components, they enable entirely new approaches to robotic joint design by reducing mechanical interfaces and simplifying system architecture.
As robots become more sophisticated, sensor consolidation will likely become a key differentiator in achieving both performance and manufacturability objectives.
Unique Insight: The Future of Robotics Is About Integration, Not Just Precision
From my perspective as an industrial automation engineer, the most significant aspect of the AksIM-4™ Dual Concentric is not merely its measurement capability—it is the level of system integration it enables.
For years, robotic innovation has focused heavily on increasing motor performance, improving control algorithms, and enhancing computing power. However, future breakthroughs will increasingly come from reducing system complexity. Every eliminated connector, cable, bracket, and sensor contributes to improved reliability, lower manufacturing costs, and faster deployment.
Integrated feedback devices such as the AksIM-4™ represent a broader industry trend where sensing, communication, and control functions are being consolidated into compact intelligent subsystems. This trend will be particularly important for humanoid robotics, surgical automation, and collaborative robots, where packaging constraints are among the most significant engineering challenges.
In many cases, the ability to simplify a robotic joint may ultimately deliver more value than incremental improvements in positioning accuracy alone.
Conclusion
The launch of the AksIM-4™ Dual Concentric Encoder demonstrates how advanced sensor integration can address growing demands for compactness, efficiency, and reliability in robotic systems. By combining motor and output feedback within a single ultra-thin architecture, RLS provides equipment manufacturers with a practical solution for reducing complexity while maintaining high-performance motion control.
As robotics continues its transition toward highly integrated and space-constrained designs, encoder technologies that consolidate functionality without compromising accuracy are expected to play an increasingly important role in future automation platforms.
