Electroadhesive Clutch Structure for Multi-Directional Load Transfer
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Solution Overview
Problem
Existing electroadhesive clutches are limited in their ability to transmit complex loading, including normal forces, shear forces, and moments, often requiring high voltages, complex electrode designs, and large electrical connections, which can lead to inefficiencies and reliability issues.
Innovation Solution
A low-voltage electroadhesive clutch design featuring flexible and rigid electrodes separated by a dielectric material, with optional gap-filling materials and electrical configurations using three or more electrodes to reduce connection complexity and enable transmission of complex loading, including normal, shear, and moment loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If planar comb electrode designs are used to transmit normal forces, then the clutch can selectively transmit normal forces between parallel surfaces, but the design becomes challenging and expensive to produce, requires high voltages above 1,000 volts, and achieves lower on-state force transmission per unit area
Solution Approach 1:
The electrode is divided into multiple interdigitated comb teeth that are electrically isolated from each other. This segmentation allows the electrode to transmit both normal and shear forces while maintaining electrical isolation between adjacent teeth, enabling complex loading transmission without requiring high voltages or complicated designs
Solution Approach 2:
The comb electrode design serves multiple functions simultaneously: it transmits normal forces perpendicular to the surface, shear forces parallel to the surface, and provides electrical isolation between adjacent conductive elements. This multi-functionality eliminates the need for separate components for each function, reducing overall device complexity
2Adaptability or versatility
If complex electrical connections are used to power multiple electrodes, then the clutch can function with multiple electrodes, but the connections become large and failure-prone
Solution Approach 1:
The patent extracts and eliminates the need for complex electrical connections by using a single electrode configuration that can be powered by a single voltage source. The interdigitated comb teeth are electrically isolated through dielectric material, so only one electrical connection is needed per electrode, dramatically simplifying the wiring and improving reliability
Solution Approach 2:
The dielectric material between comb teeth provides automatic electrical isolation, eliminating the need for external insulation or complex wiring arrangements. The structure itself provides the necessary electrical separation, making the system more reliable and easier to implement
3Force
If high voltages above 1,000 volts are applied to activate planar comb electrodes, then the electrodes can generate sufficient electrostatic force, but the force transmission per unit area remains lower than desired and the system becomes less efficient
Solution Approach 1:
The electrode transitions from a simple planar surface to a three-dimensional comb structure with multiple interdigitated teeth. This dimensional change increases the effective surface area and electrostatic field distribution, allowing sufficient adhesion force to be generated at lower voltages while improving force transmission efficiency per unit area
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 solution allows for quick, reliable, and efficient transmission of complex loading across connections, reducing the need for bulky electrical connections and high voltages, enhancing the clutch's versatility and performance.
Implementation Method 1
The dielectric material can coat or otherwise be attached to one or both electrodes. The dielectric material can also be placed between the electrodes without attachment to either. The dielectric prevents the two electrodes from contacting one another.
Implementation Method 2
When a voltage is applied across opposing clutch plates, where the plates are acting as electrodes, an electrostatic charge develops and creates an attractive state and causing the plates to adhere.
Data Source
AI summary
An electroadhesive clutch that establishes a quick, electrically-controllable connection of two components capable of transmitting complex loading across the connection. The quick connection is comprised of at least two electrodes separated by a dielectric material, where one of the electrodes is flexible. The dielectric material may coat or otherwise be attached to one or several electrodes or, alternatively, be placed between opposing electrodes.