Electroadhesive Clutch AC Control for Smooth Sliding Adhesion
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Solution Overview
Problem
Existing apparel support systems lack adaptability and comfort across varying activities, with issues such as bulk charge accumulation, dielectric absorption, and inadequate support during dynamic movements, leading to discomfort and potential injury.
Innovation Solution
The integration of an electroadhesive clutch system within apparel, utilizing alternating current signals to manage bulk charges, reduce dielectric absorption, and provide adjustable support through electroadhesive technology, coupled with sensors for dynamic adjustment based on activity levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If direct current voltage is applied to the electroadhesive system, then strong adhesion force is achieved, but bulk charge accumulation and dielectric absorption occur causing actuator stick-slip motion
Solution Approach 1:
The patent applies periodic alternating current voltage instead of direct current to the electroadhesive actuator. This periodic action prevents bulk charge accumulation and dielectric absorption by continuously reversing the electric field direction, thereby eliminating stick-slip motion and ensuring smooth actuator operation while maintaining adhesion force.
Solution Approach 2:
The patent changes the electrical parameter from direct current to alternating current with specific frequency and voltage characteristics. This parameter change transforms the electroadhesive system from one that accumulates bulk charge to one that maintains continuous smooth operation, resolving the contradiction between adhesion force and motion smoothness.
2Force
If higher voltage is applied to increase adhesion force, then stronger support is provided, but bulk charge accumulation increases causing system instability
Solution Approach 1:
By applying periodic alternating current voltage, the system prevents bulk charge accumulation even at higher voltage levels. The continuous reversal of the electric field prevents charge buildup, allowing high adhesion force to be achieved without compromising charge distribution stability or system stability.
3Ease of operation
If the electroadhesive system is made more compliant for comfort, then wearability is improved, but support capability during dynamic activities decreases
Solution Approach 1:
The patent employs dynamically controllable electroadhesive clutches that can adjust their adhesion characteristics in real-time. The system transitions between compliant and supportive states based on activity detection, providing comfort during static wear and enhanced support during dynamic activities through active control of the electroadhesive force.
Solution Approach 2:
The system changes the electroadhesive parameters (voltage, frequency) dynamically to adjust between compliant and supportive modes. This allows the same system to provide both comfort for wearability and sufficient support capability during dynamic activities, resolving the contradiction between these two requirements.
4Force
If electroadhesive clutches are added to provide dynamic support, then support capability is enhanced, but device complexity increases
Solution Approach 1:
The patent replaces traditional mechanical fastening systems with electroadhesive clutches that use electrostatic forces for attachment and detachment. This substitution provides dynamic support capability while reducing mechanical complexity, as the electroadhesive system offers controlled adhesion without complex mechanical components.
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 electroadhesive clutch system enhances comfort and support by dynamically adjusting to activity levels, reducing strain on body tissues and preventing unwanted movement, thereby improving performance and reducing the risk of injury.
Implementation Method 1
electroadhesive clutch system utilizing alternating current signals to manage bulk charges, reduce dielectric absorption, and provide adjustable support through electroadhesive technology
Implementation Method 2
electroadhesive technology
Data Source
AI summary
An electroadhesive clutch device can include a first electrode assembly comprising a first conductive portion that is at least partially covered by a first dielectric insulator, a second electrode assembly comprising a second conductive portion that is at least partially covered by a second dielectric insulator, and an electrical signal generator configured to provide first and second signals to the first and second conductive portions of the electrode assemblies, respectively. The first and second electrode assemblies can be at least partially overlapping and configured to slide relative to each other at respective surfaces that comprise the first and second dielectric insulators.