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Humanoid Robotic Joint Load Cells

Compact Axial Force Measurement for Precision and Safety

A robotics team set out to improve how humanoid robots control force and interact safely with people. To achieve this, they focused on better understanding axial forces within linear motors used as joints. ANYLOAD’s 247BSWM load button was well-suited to this application, integrating directly at the end of the joint drive or within the lead screw. It measures axial force in real-time, improving control response and detecting collisions, sudden load changes, and assembly issues. This creates a closed-loop feedback system that enhances precision, adaptability, and overall safety during operation.

Défi

  1. Limited Space: Motor interiors are highly compact. To maintain joint performance and responsiveness, the load cell must minimize added size or weight.
  2. Complex Loading Conditions: The load cell must handle continuous compressive and tensile forces, sudden impacts, and combined bending and torsion loads. It also needs to respond quickly to capture rapid force changes during operation.
  3. Long-Term Durability: Robot joints must withstand millions of repeated movements over their lifetime. Load cells must maintain consistent accuracy and stable signals under continuous cyclic loading.
  4. Noise and Electrical Interference: Electrical interference from motors and drivers, along with temperature changes, can affect signal quality. Load cells must maintain stable and accurate measurements in these conditions.

Solution

  1. Compact Design: The load button enables seamless integration into limited motor space while minimizing added mass and dimensional impact, maintaining optimal joint performance.
  2. Force Isolation and Compensation: Optimized strain gauge placement and bridge configuration isolate axial forces from other load interference. Integrated temperature sensing and compensation maintain measurement accuracy exceeding ±0.1% FS across a wide operating range from -30°C to 90°C.
  3. High Fatigue Resistance: The load cell undergoes extensive fatigue testing to ensure long-term durability. Furthermore, high-stability strain gauges are used, ensuring a fatigue life exceeding 10 million cycles under rated load.
  4. Stable Signal Output: Digital filtering ensures clean measurements, while integrated digital outputs enable reliable, noise-resistant communication and seamless system integration across varying environments.
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Conclusion

ANYLOAD’s 247BSWM load button highlights how force measurement can improve humanoid robotic joints. It provides reliable, real-time force feedback without adding significant size or complexity. This improves control accuracy, response time, and interaction safety.

AL-Singular-Humanoid-Joints

Mots-clés : Humanoid Robots, Embodied Robotics, Tension and Compression Load Cell, Force Sensor, Robotic Mechanism. 

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247BSWM
Bouton de chargement
Voir la version standard.

The ANYLOAD 247BSWM Load Button Load Cell is a compact stainless steel compression force sensor with dual threaded studs, designed for precise force measurement in industrial automation, test and measurement systems, and OEM machinery. Its button-style compression interface and inline threaded mounting allow the sensor to be easily installed between machine components, enabling accurate measurement of compressive forces within limited installation space. The robust stainless steel construction and sealed strain gauge design provide stable, repeatable force measurement in demanding industrial environments.

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