Actuator Member With Continuous Conductive Paths
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The inefficiency of electrical transfer in actuators comprising electroactive polymer (EAP) particles embedded in a compliant matrix results in reduced power supply to EAP particles due to disparities in electrical properties between the EAP particles and the matrix material, leading to significant electrical losses across the matrix material.
Innovation Solution
The actuator member is designed with continuous material paths extending between major surfaces, where all material forming these paths has an electrical resistivity equal to or less than that of the EAP particles, ensuring low impedance electrical paths for efficient electrical supply to the EAP particles, and the compliant matrix material is structured to have a resistivity equal to or less than that of the EAP particles to minimize voltage drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If EAP particles are embedded in a compliant matrix to enable local control of surface shape, then controllability of actuator shape is improved, but electrical transfer efficiency deteriorates due to high resistance of matrix material
Solution Approach 1:
Conductive particles are introduced as an intermediary substance within the compliant matrix material to create continuous conductive pathways. These conductive particles act as mediators that facilitate efficient electrical transfer from electrodes to EAP particles while maintaining the mechanical compliance of the matrix, thereby resolving the contradiction between shape controllability and electrical transfer efficiency
Solution Approach 2:
The matrix material is transformed into a composite material by incorporating conductive particles (such as carbon black, carbon nanotubes, or metal particles) into the compliant matrix. This composite structure combines the electrical conductivity needed for efficient power transfer with the mechanical compliance required for EAP particle movement and local surface shape control, thus resolving the electrical-mechanical property contradiction
2Adaptability or versatility
If a large amount of matrix material is used to embed EAP particles, then flexibility and compliance of the actuator are improved, but power supply to EAP particles deteriorates due to increased electrical resistance
Solution Approach 1:
The matrix material is designed with non-uniform properties: regions containing conductive particles are created to form conductive pathways, while other regions maintain pure compliant matrix for flexibility. This local differentiation allows the actuator to have both high flexibility where needed and low electrical resistance where power transfer is required, resolving the contradiction between flexibility and power supply
Solution Approach 2:
Conductive particles serve as intermediary elements that bridge the electrical gap created by the compliant matrix material. These particles create percolation pathways through the matrix, enabling power to reach EAP particles effectively even when large volumes of compliant material are used, thus maintaining both flexibility and power supply capability
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 configuration significantly improves the electrical supply to EAP particles, enhancing actuation force and deformation capabilities by reducing electrical losses and ensuring reliable shape change performance.
Implementation Method 1
an actuator member comprising an electroactive polymer
Data Source
Figure 1~3(b)
Figure 4~5
Figure 6(a)~7
AI summary
An actuator member (22) has a body (24) formed of a composite material of electroactive material (EAM) particles (32) and a compliant matrix material (34). The composite material of the body is materially structured such that it incorporates one or more continuous material paths extending between a first (30) and second (31) major surface of the actuator body, each path including at least one EAM particle, and wherein all material of the path has an electrical resistivity equal to or less than that of the EAM particle(s).