EAHS Actuator Material Segmentation for High Stress Low Voltage
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Solution Overview
Problem
Existing actuator technologies face challenges in generating high quasi-static loads and stress density while being driven by low voltages and currents, limiting their applicability in robotics and automation applications, and there is a need for new materials to facilitate the fabrication of soft electrical actuators using 3D printing techniques.
Innovation Solution
The development of Electrically Actuated Hydraulic Solid (EAHS) materials, comprising a polymer matrix with a phase change material and conductive components, which allows for the creation of 3D printed actuators that can generate high forces and stresses at low voltages and currents, replicating the functionality of traditional wax actuators through a distributed cellular structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If traditional actuator technologies (dielectric, piezoelectric, shape memory alloys, swelling polymer gels) are used, then high frequency response or high strain or compliance is achieved, but the ability to generate high quasi-static loads and stress density is limited
Solution Approach 1:
The actuator is segmented into multiple independent chambers filled with different materials (wax, elastomer, conductive fluid) that work together to generate force. Each chamber can expand and contract independently, allowing the actuator to generate high quasi-static loads through cumulative effect while distributing the power requirements across multiple lower-voltage components.
Solution Approach 2:
The invention uses composite materials including wax-elastomer composites and conductive fluids embedded in polymer matrices. These composite materials enable the actuator to achieve both high force generation through wax expansion and electrical conductivity through the conductive fluid network, resolving the contradiction between force generation and power consumption by eliminating the need for high-voltage dielectric layers.
2Ease of manufacture
If 3D printing is used to fabricate actuators, then manufacturing flexibility and geometric complexity are improved, but manufacturing precision and reliability are worsened compared to traditional fabrication methods
Solution Approach 1:
The invention changes the material parameters by developing printable wax-elastomer composite materials with controlled viscosity and curing characteristics. These material parameter changes enable 3D printing to achieve manufacturing precision comparable to traditional methods while retaining the geometric flexibility and manufacturing ease that 3D printing provides.
Solution Approach 2:
The use of composite materials (wax embedded in elastomer matrix) enables the 3D printed actuator to achieve the desired mechanical properties and dimensional accuracy. The elastomer matrix provides structural integrity and precision while the wax provides the actuation function, resolving the contradiction between manufacturing ease and manufacturing precision.
3Adaptability or versatility
If complete electromechanical motors are manually assembled with printed components, then functional integration is improved, but device complexity and production time are worsened
Solution Approach 1:
The invention merges multiple functions (structural support, electrical conduction, actuation) into a single 3D printed component. The conductive fluid network is embedded within the printed polymer structure, eliminating the need for separate wiring and assembly steps, thus reducing device complexity while maintaining functional integration.
Solution Approach 2:
The 3D printed actuator component serves multiple functions simultaneously: it provides structural support, contains the wax and conductive fluid, and conducts electricity through the embedded conductive network. This multi-functionality reduces the number of separate components needed, thereby reducing assembly complexity while maintaining adaptability.
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
EAHS materials enable the production of actuators that can generate significant forces and stresses, offering a new performance tradeoff unachieved by existing technologies, with the ability to expand volumetrically and operate at low voltages and currents, making them suitable for various applications including robotics and automation.
Implementation Method 1
a new material including a conductive material component for use in the fabrication of actuators
Implementation Method 2
a phase change material and conductive components, both suspended in the polymer matrix
Data Source
AI summary
With applications such as soft robotics being severely hindered by the lack of strong soft actuators, the invention provides a new soft-actuator material—Electrically Actuated Hydraulic Solid (EAHS) material—with a stress-density that outperforms any known electrically-actuatable material. One type of actuator is fabricated by making a closed cell that acts as highly paralyzed version of a standard paraffin actuator. Each cell exhibits microscopic expansion, which is summed to produce macroscopic motion. The closed cellular nature of the material allows the system to be cut and punctured and still operate. It can be produced in a lab or industrial scale, and can be formed using molding, 3D printing or cutting.