A compact six-axis force/torque sensor using photocouplers for impact robustness

Area of Science:

• Robotics
• Sensor Technology
• Mechanical Engineering

Background:

• Robotic systems require precise force and torque measurement for advanced manipulation and interaction.
• Existing force/torque sensors often face limitations in terms of size, weight, manufacturing complexity, or performance.
• There is a need for compact, high-performance sensors that are easily manufactured and integrated into robotic systems.

Purpose of the Study:

• To present a novel six-axis force/torque (F/T) sensor design for robotic applications.
• To develop a sensor that is both compact and easy to manufacture while maintaining high performance.
• To demonstrate a sensor with an improved measuring range, resolution, and response frequency.

Main Methods:

• A novel in-plane sensing element arrangement on a single printed circuit board was developed.
• Noncontact sensors and a streamlined structure were utilized to enhance durability and sensing range.
• An integrated analog-to-digital converter was incorporated to simplify external communication requirements.

Main Results:

• The designed sensor achieves a high measuring range of approximately 3700 N and exceptional resolution of 0.1 N.
• A rapid sampling rate of 5 kHz and a weight under 80 g were achieved.
• The lightweight prototype demonstrated superior performance and high response frequency when validated against a reference sensor.

Conclusions:

• The novel six-axis F/T sensor design offers a compelling combination of compactness, ease of manufacturing, and high performance.
• The sensor's features, including its wide sensing range and high response frequency, make it suitable for demanding robotic applications.
• This development represents a significant advancement in sensor technology for robotics, enabling more sophisticated and efficient robotic systems.