Stationary-Shaft Flywheel Layout for Stress-Stable Energy Storage
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Solution Overview
Problem
Flywheel systems in unstable environments, such as offshore or earthquake-prone areas, face performance and lifetime issues due to substantial forces that cause structural instability and stress concentration, leading to energy loss and reduced efficiency.
Innovation Solution
A flywheel system configuration with a rotor rotating about a stationary shaft, eliminating structurally weak points and allowing for a larger interface region between the rotor and stationary parts, which reduces stress and energy loss through balanced torque application and magnetic levitation, enabling improved stability and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rotating shaft is used to connect the rotor to the stator, then the generator can be mechanically coupled to the rotor, but structural instability and stress concentration occur in unstable environments
Solution Approach 1:
The patent inverts the conventional configuration by making the shaft stationary rather than rotating. The stationary shaft passes through the rotor's aperture and is magnetically coupled to the stator, while the rotor rotates around it. This inversion eliminates the mechanical coupling between the rotating rotor and shaft, removing the source of stress concentration and structural instability in unstable environments.
2Loss of energy
If magnetic levitation is used to reduce friction, then energy loss is reduced, but the rotor requires precise positioning and control
Solution Approach 1:
The patent replaces mechanical contact and friction with magnetic fields for both levitation and torque transmission. Magnetic bearings provide contactless support to eliminate frictional energy loss, while magnetic coupling between the rotor and stationary shaft transmits torque without mechanical contact. This substitution of mechanical systems with magnetic fields reduces energy loss while managing positioning complexity through magnetic field control.
3Reliability
If the shaft is made stationary and passes through the rotor aperture, then stress concentration is reduced and stability is improved, but the generator coupling mechanism becomes more complex
Solution Approach 1:
The patent introduces magnetic fields as an intermediary between the rotor and stationary shaft. The magnetic coupling mechanism uses magnetic fields to transmit torque from the rotating rotor to the stationary shaft, which then connects to the generator. This intermediary magnetic field system enables the generator coupling while maintaining the stationary shaft configuration that reduces stress concentration and improves stability.
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 configuration enhances stability, reduces energy loss, and extends the lifespan of flywheel systems by minimizing stress concentration and optimizing component placement, resulting in improved performance and efficiency in unstable environments.
Implementation Method 1
the rotor of a high-performance flywheel typically is magnetically levitated
Implementation Method 2
The rotor may be magnetically coupled with an electromagnetic generator stator to allow the flywheel system to convert between rotational energy of the rotor and electrical energy
Data Source
AI summary
A flywheel system includes a rotor and a fixture. The rotor forms an aperture. The fixture includes a bottom support, a top support, and a shaft connecting the bottom support to the top support. The shaft passes through the aperture. The bottom support and the top support are outside opposite ends of the aperture. The rotor is configured to rotate about the shaft. A method for operating a flywheel system includes converting between rotational energy of a rotor and electrical energy in windings of a generator stator that is implemented in a stationary shaft passing through an aperture of the rotor, while the rotor is rotating about the shaft.