Spiral-Wound EAP Generator for Deflection Energy Conversion
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Solution Overview
Problem
Existing EAP stacks are only effective for energy conversion during deformation along their longitudinal axis and not during deflection, limiting their application in generating electrical energy from various kinetic movements.
Innovation Solution
The method involves spirally winding a strip with electroactive polymer layers and non-consecutive electrodes, creating multiple separate electrodes per winding, allowing for efficient energy conversion from deflection movements by separating electrodes into sectors and using a form-locked rod for precise positioning, enabling the EAP stacks to be bendable and generate energy from deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If EAP stacks are manufactured with conventional layer stacking methods, then they can be produced with simple structure, but they are only effective for energy conversion during longitudinal deformation and not during deflection
Solution Approach 1:
The patent applies spiral winding to transform the flat EAP stack into a curved, three-dimensional structure. The spiral configuration allows the stack to deflect along its longitudinal axis while maintaining functional electrode alignment, enabling energy conversion from deflection movements. This curved geometry resolves the contradiction by adding deflection capability without requiring multiple separate stacks.
Solution Approach 2:
The invention transitions from a two-dimensional layered structure to a three-dimensional spiral configuration. By winding the flat stack spirally around a core, the patent creates a structure that occupies additional spatial dimension, allowing simultaneous longitudinal deformation and deflection capabilities. This dimensional change enables the stack to respond to bending movements while maintaining electrode functionality.
2Adaptability or versatility
If electrodes are divided into multiple sectors for deflection energy conversion, then energy conversion from deflection movements is enabled, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-dividing electrodes into sectors on the flat EAP stack before spiral winding. The electrode patterns are designed and positioned in advance on the planar structure, ensuring correct alignment. During spiral winding, this pre-configured electrode arrangement automatically translates into the three-dimensional structure with proper sector alignment, reducing the need for high-precision positioning during final assembly.
Solution Approach 2:
The patent segments the continuous electrode structure into multiple discrete sectors on the flat EAP stack. These segmented electrodes are arranged in specific patterns that, when spiral-wound, create the necessary three-dimensional electrode configuration for deflection energy conversion. The segmentation allows independent control of different stack regions while maintaining manufacturing feasibility through pre-patterning.
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 approach enables EAP generators to effectively convert mechanical energy from deflection movements into electrical energy, making them suitable for use as both generators and actuators capable of bending, thus expanding their application beyond longitudinal deformation.
Implementation Method 1
The conversion of the expansion of the electroactive polymer into electrical energy takes place on a capacitive basis by the shifting of charges.
Implementation Method 2
When the action of the external force is reduced, the electroactive polymer relaxes due to its elasticity.
Data Source
AI summary
In a method for manufacturing electroactive polymer generators, a strip, including one layer of an electroactive polymer and electrodes applied to sections of this layer, is spirally wound in such a way that multiple electrodes are situated congruently on top of each other, in each case two electrodes situated on top of each other being separated from each other by a layer of electroactive polymer.