Electrostatic Jamming Sheets for Low-Voltage Motion Resistance
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Solution Overview
Problem
Existing electrostatic jamming devices face challenges such as limited flexibility, high voltage requirements, susceptibility to electrical breakdown, and difficulty in manufacturing due to the need for continuous dielectric layers that extend beyond conductive layers, which complicates fabrication and increases the risk of shorting or arcing.
Innovation Solution
The development of an electrostatic sheet jamming apparatus using thin dielectric layers with conductive layers held at or beyond the thickness of the dielectric layer, operating below the breakdown voltage of air, allowing for low-voltage operation and immunity to defects like pinholes or cracks, and enabling the use of roll-form materials that can be easily cut and assembled into desired shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous dielectric layers are used to extend beyond conductive layers, then electrical breakdown resistance is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent divides the dielectric layer into discrete segments positioned between adjacent conductive layers rather than using continuous dielectric extensions. This segmentation simplifies fabrication by eliminating the need for complex continuous layer formation while maintaining electrical isolation and breakdown resistance through properly positioned dielectric barriers at critical interfaces.
Solution Approach 2:
The patent extracts the essential function of electrical breakdown prevention from the continuous dielectric layer concept and implements it through localized dielectric elements positioned only where needed between conductive layers. This removes the unnecessary complexity of extending dielectric layers beyond conductive boundaries while preserving the protective function.
2Force
If high voltage is used for electrostatic jamming, then motion resistance is improved, but susceptibility to electrical breakdown increases
Solution Approach 1:
The patent introduces dielectric layers as intermediary elements between conductive layers that enable high voltage operation by providing electrical isolation and preventing direct breakdown paths. These dielectric intermediaries allow the system to operate at higher voltages for greater motion resistance while the dielectric barriers prevent electrical breakdown by forcing discharge paths through the controlled dielectric material rather than through air or direct conductor contact.
3Ease of manufacture
If thin dielectric layers are used, then manufacturing is simplified and flexibility is improved, but risk of shorting increases
Solution Approach 1:
The patent applies different dielectric layer thicknesses and positions based on local requirements - using thin dielectric layers where manufacturing simplicity and flexibility are priorities, while positioning dielectric elements at critical locations where electrical isolation is most needed. This local optimization allows thin layers to be used throughout the structure without uniformly increasing shorting risk, as dielectric elements are strategically placed at interfaces and high-stress regions.
4Ease of manufacture
If conductive layers extend beyond dielectric layers, then manufacturing is simplified, but risk of arcing and shorting increases
Solution Approach 1:
The patent inverts the conventional approach by having dielectric layers positioned between and among conductive layers rather than having conductive layers extend beyond dielectric layers. This inversion simplifies manufacturing by eliminating the need to form continuous dielectric extensions while reducing arcing and shorting risk through proper dielectric positioning at all critical conductor-conductor interfaces.
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 achieves significant motion resistance at low voltages, reduces the risk of electrical breakdown, and simplifies manufacturing by allowing for the use of roll-form materials, making the device safer for human use and more cost-effective with improved reliability.
Implementation Method 1
The first sheet and the second sheet are jammed with each other in a second state when a voltage is applied between the first conductive layer and the second conductive layer
Data Source
AI summary
At least some embodiments of the present disclosure direct to an electrostatic sheet jamming apparatus comprising a first sheet comprising a first conductive layer, the first sheet comprising a set of first features, a first dielectric layer, and a second sheet comprising a second conductive layer and disposed proximate to the first dielectric layer, the second sheet comprising a set of second features. The first dielectric layer is disposed between the first conductive layer and the second conductive layer. The first sheet and the second sheet are non-extensible and flexible. The first sheet and the second sheet are movable relative to each other in a first state. The first sheet and the second sheet are jammed with each other in a second state when a voltage is applied between the first conductive layer and the second conductive layer.