Flywheel Stabilization Using HTS Magnetic Bearings
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Solution Overview
Problem
Existing energy storage devices face challenges in stabilizing flywheels without physical contact, particularly in maintaining precise levitation and damping without electronic control, especially when using high temperature superconducting magnetic bearings.
Innovation Solution
The energy storage device employs a housing with a cryogenic cooling system, including heat pipes and a cryogenic generator, coupled with high temperature superconducting magnetic bearings to stabilize a flywheel, allowing it to rotate frictionlessly within the housing. The magnetic bearings are positioned at angles to provide both vertical and horizontal stabilization, and a synjet motor is used for rotation, ensuring efficient cooling and stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If high temperature superconducting magnetic bearings are used to suspend the flywheel without physical contact, then friction and energy losses are reduced, but stability control and positioning precision become difficult without electronic control
Solution Approach 1:
The patent employs high temperature superconducting magnetic bearings that provide self-regulated stabilization through electromagnetic field interactions. The HTS magnets inherently provide restoring forces and damping characteristics without requiring external electronic control systems, allowing the flywheel to maintain stable levitation and rotation autonomously
Solution Approach 2:
The patent replaces traditional mechanical contact bearings with high temperature superconducting magnetic bearings that use electromagnetic fields for support and stabilization. This substitution eliminates physical contact and friction while providing inherent stability control through the magnetic field interactions between the HTS magnets and the flywheel
2Speed
If high temperature superconducting magnetic bearings are used for rapid rotation, then friction is eliminated, but cooling requirements increase system complexity
Solution Approach 1:
The patent utilizes the temperature-dependent properties of high temperature superconducting materials, which exhibit superconductivity above liquid nitrogen temperature (77K). By operating in this temperature regime rather than requiring near-absolute-zero cooling, the system achieves rapid rotation capabilities with significantly simplified cooling requirements compared to conventional superconducting systems
3Stability of the object's composition
If magnets are positioned at angles for multi-axis stabilization, then flywheel stability is improved, but manufacturing and assembly precision requirements increase
Solution Approach 1:
The patent positions magnets at specific angular orientations (e.g., 45 degrees from vertical axis) to create asymmetric magnetic field distributions that provide restoring forces in multiple axes. This asymmetric positioning enables the system to achieve stable levitation and damping in radial and axial directions simultaneously, compensating for the increased positioning requirements through careful geometric design
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 enables efficient energy storage by maintaining the flywheel's stability and low temperature requirements, reducing friction and energy losses, and allowing for high-speed rotation without electronic control, thereby enhancing the device's efficiency and operational stability.
Implementation Method 1
at least one cooling element for cooling a region interior of the housing to a preset temperature
Implementation Method 2
the cryogenic cooling system further comprises heat pipes coupled to a cryogenic generator for removing heat from the housing
Implementation Method 3
High temperature superconductors such as those with YBCO or Yttrium Barium Copper Oxide bearings
Implementation Method 4
High temperature superconducting magnetic bearings are used for the rapid rotation of flywheels
Implementation Method 5
Superconducting magnetic bearings can be self-regulated (by an electromagnetic field) without monitoring and electromagnetic regulation/attraction of the rotor
Implementation Method 6
Control and specification of the properties of HTS magnets such as levitation pressure (load), restoring forces (stiffness) and damping are determined by the magnetic interaction design
Data Source
AI summary
At least one embodiment of the invention relates to an energy storage device comprising a housing, at least one flywheel disposed in the housing, and at least one stabilizing element disposed in the housing configured to stabilize the flywheel. There can be at least one cooling element for cooling a region interior of the housing to a preset temperature. In at least one embodiment, the stabilizing element comprises a magnet. In at least one embodiment the stabilizing element can be orientated at a position offset from a horizontal axis. In at least one embodiment the stabilizing element is orientated at a position offset from a vertical axis In at least one embodiment the stabilizing element is orientated at a position between a horizontal axis and a vertical axis. In at least one embodiment, the stabilizing element comprises at least one magnet coupled to the flywheel orientated at a first angle and at least one magnet coupled to the housing orientated at an angle substantially parallel to said first angle of orientation of the magnet coupled to the flywheel.