Composite Ovoid Flywheel Structure for High-Speed Energy Storage
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Solution Overview
Problem
Current flywheel energy storage systems are limited by their structural design and material selection, leading to high costs and mass constraints, making them impractical for efficient energy storage due to the need for increased mass and complexity in subsystems to achieve higher energy storage capacity.
Innovation Solution
A high-speed, compact elliptical ovoid flywheel design utilizing a composite shell formed of helically wound resin-impregnated composite filament material with internal compressive support structures, allowing for increased rotational speed and energy storage capacity while minimizing mass and subsystem complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional mass-focused flywheel designs are used with steel or composite materials, then energy storage capacity increases, but system mass and complexity increase proportionally
Solution Approach 1:
The patent changes the geometric parameters of the flywheel from traditional disk or ring shapes to a toroidal (doughnut-like) configuration with specific aspect ratios. This shape optimization allows the flywheel to achieve higher energy density by concentrating mass more effectively at the periphery while maintaining structural integrity, thereby increasing energy storage capacity without proportionally increasing overall system mass
Solution Approach 2:
The patent employs advanced composite materials consisting of high-strength fibers embedded in a matrix material. These composite structures provide superior strength-to-weight and stiffness-to-weight ratios compared to traditional steel or solid composite materials, enabling the flywheel to store more energy per unit mass while reducing the overall system mass and complexity of supporting subsystems
2Quantity of substance
If flywheel mass is increased to achieve higher energy storage capacity, then energy storage increases linearly, but manufacturing, delivery, and emplacement become impractical
Solution Approach 1:
The patent optimizes geometric parameters including aspect ratio, wall thickness, and radial dimensions of the toroidal flywheel to achieve high energy density in a compact form factor. This allows the flywheel to store substantial energy while maintaining manageable dimensions that facilitate manufacturing, transportation, and installation without requiring excessive mass
Solution Approach 2:
The patent describes a manufacturing process where the toroidal flywheel is constructed by winding continuous fiber-reinforced material in a controlled sequence, potentially in sections or layers. This segmented construction approach enables practical manufacturing of high-energy-density flywheels without requiring the movement and assembly of extremely massive monolithic components
3Device complexity
If traditional disk or ring-rim flywheel structures are used, then structural simplicity is maintained, but energy storage capacity per unit mass is limited
Solution Approach 1:
The patent transitions from flat disk or simple ring-rim structures to a three-dimensional toroidal shape with curved surfaces. This curvature optimization allows the mass to be distributed more effectively in the rotating structure, placing more material at optimal radii for maximizing moment of inertia and energy storage capacity per unit mass, while the continuous curved geometry maintains structural efficiency
4Quantity of substance
If higher rotational speeds are achieved through stronger materials, then energy storage capacity improves by power of two, but structural design complexity increases
Solution Approach 1:
The patent utilizes fiber-reinforced composite materials with high tensile strength and stiffness properties that enable the flywheel to operate at higher rotational speeds without excessive centrifugal stresses. These advanced materials provide the necessary structural integrity to support increased rotational velocities, thereby significantly increasing energy storage capacity (which scales with the square of rotational speed) while managing structural complexity through material optimization
Solution Approach 2:
The patent implements varying material properties and structural characteristics at different locations within the toroidal flywheel structure. The composite material orientation, fiber distribution, and wall thickness are optimized locally to withstand the specific stress patterns at each radius and position, enabling the structure to support higher rotational speeds without uniform increases in mass or complexity throughout the entire structure
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 elliptical ovoid flywheel design achieves up to five times higher energy storage capacity per unit mass compared to traditional designs, with improved operational safety, flexibility, and adaptability, enabling efficient energy storage in compact and cost-effective systems.
Implementation Method 1
Flywheels have been well established for over 2000 years as energy storage devices in the form of spinning kinetic energy
Implementation Method 2
A high-speed, compact elliptical ovoid flywheel design utilizing a composite shell formed of helically wound resin-impregnated composite filament material
Data Source
AI summary
An example flywheel energy storage device includes a fiber-resin composite shell having an elliptical ovoid shape. The example device also includes an axially oriented internal compressive support between the axial walls of the shell. The example device also includes an inner boss plate and an outer boss plate on each side of the shell. The example device also includes a plurality of radially oriented, fiber-resin composite helical wraps forming the shell and coupling the shell to the inner and outer boss plates for co-rotation and torque transfer. The example device also includes boss plate attachments on internal boss plate supports to mount the shell for co-rotation and torque transfer via resin bonding, friction, and compression between the inner and outer boss plates.