Flexible Capacitor Array for High-Pressure Robot Foot Sensing
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Solution Overview
Problem
Existing mechanical sensors in robots, particularly multi-axis force sensors, are rigid and bulky, limiting their application in small spaces, while flexible sensors lack sufficient sensitivity and stability for ultra-high pressure applications, making it difficult to measure forces on a robot's foot and maintain stability during movements like walking, running, and jumping.
Innovation Solution
A flexible capacitor array with a rapid response speed, high precision, and strong impact resistance is developed, comprising a first and second flexible electrode layer, a dielectric layer, and spacer layers to form ionic double electric layer capacitors, enhancing sensitivity and stability, and allowing accurate detection of impact forces for balance control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multi-axis force sensors are used in robots, then force measurement capability is provided, but the sensors are rigid and bulky, limiting their application in small spaces
Solution Approach 1:
The patent replaces traditional mechanical force sensors with a capacitive sensing system. The capacitive sensor uses electrical fields rather than mechanical contact to detect force, enabling miniaturization while maintaining measurement capability. The flexible substrate with capacitor structures allows force detection in compact forms suitable for robot feet.
Solution Approach 2:
The patent employs a flexible substrate with thin-film capacitor structures to create a compact, adaptable sensor that can conform to small surfaces. This flexible design replaces rigid mechanical sensors, reducing volume while preserving force measurement functionality through capacitive changes detected during compression.
2Volume of moving object
If flexible sensors are used to miniaturize the sensor, then volume is reduced, but the pressure measurement capability and stability are insufficient for ultra-high pressure applications
Solution Approach 1:
The patent uses composite capacitor structures with multiple layers including flexible substrates, dielectric materials, and electrode patterns. This composite design enhances the sensor's ability to detect ultra-high pressure while maintaining flexibility and miniaturization. The layered structure provides both mechanical compliance and electrical sensitivity for accurate pressure measurement.
Solution Approach 2:
The patent optimizes capacitor parameters such as electrode area, spacing, and dielectric properties to enhance sensitivity for ultra-high pressure detection. By adjusting these parameters, the sensor achieves sufficient measurement precision for robot foot forces while maintaining a miniaturized flexible form factor.
3Volume of moving object
If flexible sensors are used to reduce sensor size, then volume is reduced, but stability is insufficient to accurately measure pressure during robot movement
Solution Approach 1:
The patent divides the sensing area into multiple capacitor elements arranged in arrays on the flexible substrate. This segmentation allows for spatial resolution of pressure distribution while the collective measurement provides stable overall force detection. The segmented structure compensates for local deformations, maintaining measurement stability during dynamic robot movement.
4Measurement precision
If traditional sensors are used for force detection, then force measurement is possible, but it is difficult to calculate zero torque points and construct dynamic balance controllers for stable movement
Solution Approach 1:
The patent's capacitive sensor array provides multi-functional capability by simultaneously measuring force magnitude, direction, and distribution across the foot surface. This rich data set enables comprehensive balance control algorithms to calculate zero torque points and construct dynamic balance controllers, reducing the need for separate specialized sensors and simplifying the overall control system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The flexible capacitor array enables precise detection of impact forces, facilitating balance control and stability in robot movements by calculating zero torque points and constructing dynamic balance controllers, improving movement stability and adaptability to complex environments.
Implementation Method 1
A flexible capacitor array with a rapid response speed, high precision, and strong impact resistance is developed, comprising a first and second flexible electrode layer, a dielectric layer, and spacer layers to form ionic double electric layer capacitors
Implementation Method 2
spacer layers to form ionic double electric layer capacitors, enhancing sensitivity and stability
Data Source
Figure 1~2A
Figure 2B~2C
Figure 2D~3A
AI summary
A flexible capacitor array (20), comprising: a first flexible electrode layer (201), a first electrode array (2012) being provided thereon; a second flexible electrode layer (202), a second electrode array (2022) provided opposite the first electrode array being provided thereon; and a spacer layer (204) and a dielectric layer (203), the spacer layer and the dielectric layer being provided between each electrode pair provided opposite each other in the first electrode array and the second electrode array, and each unit capacitor of the flexible capacitor array comprising an electrode pair, the spacer layer and the dielectric layer. Also disclosed are a preparation method for the flexible capacitor array, a capacitor array detection system, and a robot. The flexible capacitor array realizes the flexibility, high sensing density and high sensitivity of a mechanical sensing system by combining the flexible electrode layers and the dielectric layer, and improves the stability of the flexible capacitor array while achieving high sensitivity by means of the spacer layer, so that the flexible capacitor array as a whole exhibits flexibility and greatly improves the sensitivity, stability, and ability to withstand high pressure of a pressure sensing system. The motion balance control of the robot can be performed on the basis of the result of the capacitor array detection system.