Conical Flywheel Rotor with Composite Rim and Fluid Cavity
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Solution Overview
Problem
Existing high-speed flywheel systems face limitations in achieving safe operation at very high speeds due to material strength constraints, efficiency, and vibration issues, which restrict their storage capacity, size, and mass reduction.
Innovation Solution
A flywheel apparatus with upper and lower conical sections featuring alternating layers of tempered and non-tempered rings joined with an elastomeric adhesive, a hollow core, and a carbon fiber composite rim, driven by a brushless DC motor, which includes a hollow cavity that can be filled with fluids to enhance vibration damping and energy storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the angular velocity of the flywheel is increased to increase stored rotational energy, then the energy storage capacity increases, but the structural integrity of the flywheel rotor deteriorates due to material strength limitations
Solution Approach 1:
The flywheel rotor is constructed using composite materials, specifically a carbon fiber reinforced plastic matrix composite, which provides superior strength-to-weight ratio and allows the flywheel to operate at higher angular velocities without compromising structural integrity. The composite structure enables sustained operation at speeds exceeding 100,000 rpm while maintaining safety factors of at least 1.25
Solution Approach 2:
The flywheel rotor is segmented into multiple layers with alternating tempered and non-tempered rings joined by elastomeric adhesive. This segmentation allows each layer to be optimized for specific stress conditions, with tempered layers providing strength at critical high-stress regions and non-tempered layers providing flexibility and vibration damping, enabling the structure to withstand high rotational speeds
2Quantity of substance
If the maximum angular velocity is increased to improve energy density, then the stored energy increases, but the rotor mass and size requirements decrease, creating challenges for structural design
Solution Approach 1:
The use of carbon fiber reinforced plastic composite materials provides an optimal strength-to-weight ratio that enables high energy density while minimizing rotor mass. This allows the flywheel to achieve high angular velocities (exceeding 100,000 rpm) without requiring excessive mass, thereby achieving both high energy density and reduced weight
Solution Approach 2:
The invention changes the physical and mechanical parameters of the rotor material through tempering processes applied to alternating layers. This creates a gradient of material properties optimized for different radial positions, allowing the rotor to achieve high angular velocities with reduced mass by optimizing material distribution rather than uniformly increasing overall mass
3Power
If the flywheel operates at very high speeds to increase power output, then the power pulse capability increases, but vibration and stability issues worsen
Solution Approach 1:
The rotor is segmented into alternating tempered and non-tempered layers that act as independent vibration-damping elements. The elastomeric adhesive joints between layers provide flexibility that absorbs high-frequency vibrations, allowing the flywheel to operate at speeds exceeding 100,000 rpm while maintaining stability and suppressing harmful vibrations
Solution Approach 2:
The tempering process changes the mechanical parameters of alternating layers, creating a damped structure that naturally suppresses vibrations. The tempered layers provide structural rigidity for power transmission while the non-tempered layers provide vibration damping, enabling high power output with maintained stability
4Ease of manufacture
If traditional single-material rotor designs are used to simplify manufacturing, then the ease of manufacture is maintained, but the efficiency and energy storage capacity are limited
Solution Approach 1:
The invention uses composite materials with a plastic matrix reinforced with carbon fiber, which can be manufactured using established composite fabrication techniques. While the material composition is advanced, the manufacturing process leverages existing composite industry capabilities, making the complex structure achievable without prohibitively increasing manufacturing difficulty
Solution Approach 2:
The segmented layer structure with alternating tempered and non-tempered rings can be manufactured as separate components and assembled using elastomeric adhesive. This modular approach allows each layer to be optimized and manufactured independently using standard processes, then combined to create the high-performance multi-layer structure, balancing manufacturing ease with enhanced efficiency
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
Enables operation at speeds above 100,000 rpm with increased storage capacity, reduced mass, and size, effectively absorbing microvibrations and vibrations, making it suitable for compact applications and improved energy storage.
Implementation Method 1
The alternating layers of tempered rings and non-tempered rings may be joined with a elastomeric adhesive
Implementation Method 2
a hollow cavity that can be filled with fluids to enhance vibration damping and energy storage
Implementation Method 3
The hollow cavity may be filled with a fluid, which may be oil based, water based or mercury based
Implementation Method 4
the rim is formed of a carbon fiber composite material
Implementation Method 5
a brushless DC motor
Data Source
AI summary
A flywheel apparatus has a motor, a drive shaft connected to the motor, an upper conical section affixed to the drive shaft, and a lower conical section affixed to the drive shaft opposite said upper conical section. The upper conical section and lower conical section each have a plurality of layers, including a hollow core positioned adjacent the drive shaft, and alternating layers of tempered rings and non-tempered rings arranged outwardly of the hollow core. The alternating layers of tempered rings and non-tempered rings are joined with a elastomeric adhesive. The plurality of layers further include a hollow cavity positioned outwardly of the alternating layers, and a rim positioned outwardly of said hollow cavity. The hollow cavity can be filled with a fluid such as water, mercury-based fluids, oil-based fluids, or mixtures thereof.