Magnetic Flexible Tactile Sensor with Folding Magnetization
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Solution Overview
Problem
Traditional flexible tactile sensors can only detect pressure and lack the ability to identify the location and position of applied forces, and their large-scale implementation is hindered by complex signal processing and maintenance requirements.
Innovation Solution
A magnetic flexible tactile sensing structure based on a folding magnetization method, utilizing a flexible body with a negative Poisson's ratio structure and a three-axis Hall sensor to detect changes in the magnetic field, allowing for simultaneous measurement of force magnitude and position, and featuring a contactless sensing mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional tactile sensors use pressure sensing mechanisms, then pressure detection is achieved, but location and position information of applied forces cannot be identified
Solution Approach 1:
The patent introduces magnetic field as an intermediary between the force application and the sensing element. A magnetic flexible tactile sensing structure with permanent magnetic materials is placed between the external force and the Hall sensor, allowing the magnetic field to transmit mechanical deformation information to the sensor without direct mechanical contact, thereby enabling position detection
Solution Approach 2:
The patent replaces traditional mechanical contact-based pressure sensing with a magnetic field-based sensing system. The Hall sensor detects changes in magnetic field caused by mechanical deformation of the magnetic flexible structure, substituting direct mechanical measurement with electromagnetic measurement to achieve both force and position information
2Loss of information
If tactile sensor arrays are used to sense size and position of force, then more information is obtained, but large number of wires must be used causing troublesome maintenance
Solution Approach 1:
The patent employs a single Hall sensor that performs multiple functions: detecting both the magnitude and position of applied forces through magnetic field variations. This multi-functional approach eliminates the need for multiple separate sensors and their associated wiring, reducing device complexity while maintaining complete tactile information
Solution Approach 2:
The magnetic flexible tactile sensing structure acts as an intermediary that encodes both force magnitude and position information into magnetic field changes, which are then decoded by a single Hall sensor. This intermediary mechanism allows one sensor to replace multiple sensors, significantly reducing wiring requirements
3Ease of repair
If liquid metal is used to alleviate maintenance problems, then maintenance issues are partially solved, but burden of large-scale signal processing still hinders application
Solution Approach 1:
The patent extracts the signal processing burden from the sensor array by using a single Hall sensor with a simple output signal. The magnetic flexible structure itself performs the information encoding, extracting position and force data into magnetic field patterns that require minimal processing, thereby eliminating the complex signal processing burden while maintaining ease of repair
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
This solution enables the detection of force magnitude and position with a linear relationship between load characteristics and signals, simplifying data processing and expanding applications to robotic tactile skins and extreme environments, while reducing the need for complex wiring and maintenance.
Implementation Method 1
A magnetic flexible tactile sensing structure based on a folding magnetization method includes a flexible main body containing a permanent magnetic material
Implementation Method 2
a three-axis Hall sensor to detect changes in the magnetic field
Implementation Method 3
its set area has undergone the folding magnetization treatment
Data Source
AI summary
The present disclosure discloses a magnetic flexible tactile sensor structure based on a folding magnetization method, which comprises a flexible body containing a permanent magnetic material; the flexible body has a negative Poisson's ratio structure, and its set area has undergone folding magnetization treatment. The present disclosure also discloses a sensor composed of the above-mentioned sensing structure. The sensor provided by the present disclosure can be applied in sealed and wireless scenarios. The present disclosure can detect the size and position of force. The flexible sensor has broad prospects in the application of the touch skin of robots. The function between the magnetic field-based sensing magnet and the Hall element is contactless. In some cases where it is difficult to establish isolation of the connection lines, it can also be used as an unfettered tactile sensor.