Multielectrode Power Capacitor Vibration Cancellation
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Solution Overview
Problem
Power capacitors generate undesirable audible noise due to vibrations caused by alternating voltage, which existing solutions attempt to mitigate through additional components like spring elements and damping elements that occupy space without enhancing capacitance.
Innovation Solution
A power capacitor design featuring dual-layered electrodes with the same electric potential, where each electrode comprises two parallel layers of electrically conducting material, counteracting movement and reducing vibrations by repulsion, thus achieving sound attenuation without additional space-consuming components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If spring elements or damping elements are added between capacitor elements to reduce vibrations, then audible noise is reduced, but the device complexity increases and space inside the enclosure is occupied without contributing to capacitance
Solution Approach 1:
The harmful vibration-generating component (the single-layer electrode structure) is extracted and replaced with a dual-layer electrode configuration. The invention removes the need for separate damping elements by integrating vibration cancellation directly into the electrode structure itself, thereby reducing device complexity while maintaining noise reduction benefits
Solution Approach 2:
The electrode structure is given multiple functions: it serves both as the electrical conductor for capacitance and as the vibration-cancelling element. The dual-layer electrode configuration simultaneously provides electrical functionality and mechanical vibration attenuation, eliminating the need for separate damping components and optimizing space utilization
2Object-affected harmful factors
If spring elements or damping elements are added between capacitor elements to reduce vibrations, then audible noise is reduced, but the volume inside the enclosure is reduced due to space occupation by these components
Solution Approach 1:
The vibration cancellation function is merged with the electrode structure itself rather than being implemented as a separate component. The dual-layer electrode configuration integrates mechanical vibration attenuation directly into the electrical conductor, eliminating the need for additional space-consuming damping elements and maximizing the usable volume inside the enclosure
Solution Approach 2:
The separate damping components (spring elements, damping elements) are extracted from the design and replaced with an integrated dual-layer electrode solution. This removal of unnecessary components frees up space inside the enclosure while maintaining the noise reduction functionality
3Object-affected harmful factors
If additional damping components are added to reduce vibrations, then audible noise is reduced, but the manufacturing cost increases due to additional materials
Solution Approach 1:
The electrode structure is designed to perform multiple functions simultaneously: electrical conduction for capacitance and mechanical vibration cancellation. This multi-functionality eliminates the need for additional damping materials, thereby reducing material costs while maintaining noise reduction effectiveness
Solution Approach 2:
The electrode structure serves itself by using its own dual-layer configuration to cancel vibrations. The repulsive force between layers of the same polarity automatically provides vibration attenuation without requiring additional damping materials or components, reducing manufacturing costs
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 dual-layered electrode configuration effectively cancels vibrations and reduces sound emission, maintaining low material costs and minimal loss of capacitance per volume, while the flattened structure increases energy density and reduces noise.
Implementation Method 1
an attractive force, Coulomb force, is generated across the dielectric layer 23 between the two electrodes 19 and 21 because the two electrodes have different electric potential
Implementation Method 2
the repulsion of the two layers of each electrode, due to being on the same voltage potential, counteracts the electrode movement as the voltage alternates
Data Source
AI summary
A power capacitor including: a casing, a first bushing, a second bushing or an earthing stud having the same electric potential as the casing, wherein the first and second bushing extend through the casing, a dielectric liquid, and a plurality of wound capacitor elements, each wound capacitor element including: a first electrode having two first layers of electrically conducting material connected to the first bushing, the two first layers being arranged movable towards and from each other, a second electrode having two second layers of electrically conducting material connected to the second bushing or to the earthing stud, the two second layers being arranged movable towards and from each other, and a dielectric layer arranged between the first electrode and the second electrode, wherein the two first layers, the two second layers and the dielectric layer are together wound in a plurality of turns to obtain a plurality of layers of the first electrode, of the second electrode and of the dielectric layer, wherein the wound capacitor elements are arranged in a stacked manner in the casing, adjacent wound capacitor elements being in direct contact with each other, and wherein the capacitor elements are submerged in the dielectric liquid.