HTS Maglev Dewar Conductive Outer Container Damping
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Solution Overview
Problem
The damping in high-temperature superconducting (HTS) pinning maglev systems is insufficient to effectively suppress vibrations, leading to potential vibration instability and safety issues.
Innovation Solution
A Dewar system comprising an outer container made of an electrically conductive material, such as aluminum alloy, which induces eddy currents to enhance damping, combined with a method for calculating the width of the Dewar based on magnetic field distribution using finite element analysis, to optimize the interaction between the bulk superconductor and permanent magnet rail.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If bulk superconductor material is used in HTS pinning maglev system, then levitation force is provided based on flux-pining effect, but damping is too small to effectively suppress system vibration
Solution Approach 1:
The patent introduces an intermediate component (conductive material layer or magnetic damping material layer) between the bulk superconductor and the external environment to provide damping. This intermediary layer absorbs vibrational energy through eddy currents or magnetic hysteresis, thereby suppressing system vibrations while preserving the levitation force generated by the bulk superconductor's flux-pining effect.
2Stability of the object's composition
If outer container is made of electrically conductive material, then damping force is increased through eddy current induction, but heat exchange between liquid nitrogen and environment may increase
Solution Approach 1:
The outer container is segmented into distinct functional layers: an inner insulating layer (such as stainless steel or thermal insulation material) that prevents heat exchange, and an outer conductive layer that provides damping through eddy current induction. This segmentation allows each layer to perform its specific function independently, achieving both thermal isolation and vibration damping.
Solution Approach 2:
The outer container uses composite material construction, combining materials with different properties - thermal insulators to minimize heat transfer and electrically conductive materials to generate damping forces. This composite structure enables simultaneous achievement of thermal protection and mechanical damping without the trade-offs of single-material designs.
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 solution significantly increases the damping force of the HTS maglev system without structural changes, providing greater resistance to vibrations and improving dynamic performance, while also reducing heat exchange and prolonging the system's operational time.
Implementation Method 1
the outer container, which is closest to the permanent magnet rail, and has a large magnetic field gradient and the largest area directly opposite to the permanent magnet rail, plays a role in increasing the system damping
Implementation Method 2
The HTS pinning maglev system provides levitation force to trains based on the flux-pining effect of the HTS
Data Source
AI summary
A high-temperature superconducting (HTS) magnetic levitation (maglev) Dewar capable of increasing damping and levitation force and a width calculation method thereof. The HTS maglev Dewar includes an outer container and an inner container. The outer container is fixedly connected to the inner container through a connecting column. The inner container has a cavity configured to accommodate liquid nitrogen. A bottom of the inner container is provided with a bulk superconductor. The inner container is communicated with outside through a liquid nitrogen feeding pipe. The outer container is made of an electrically conductive material.