HTSM Maglev Capsule Interchange Using Phase Change Cooling
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Solution Overview
Problem
Current magnetically levitated transportation systems face challenges such as high energy consumption, reliance on constant electric supply and computer control, mechanical switch limitations, and inefficiencies in energy use, particularly in high-frequency and high-speed applications, which affect reliability and cost-effectiveness.
Innovation Solution
The implementation of a High Temperature Superconductor Maglev (HTSM) system for Evacuated Tube Transport (ETT) that uses solid-liquid phase change cryogenic cooling, eliminates the need for constant electric supply and computer control, and incorporates superconductor levitation elements with permanent magnets to achieve stable levitation and efficient energy use, allowing for high-frequency capsule movement without mechanical or electrical switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If electromagnetic suspension (EMS) with feedback control is used to maintain levitation, then levitation can be maintained without forward movement, but constant electric energy supply and computer control are required, increasing energy consumption and system complexity
Solution Approach 1:
The patent employs periodic action by using solid-liquid phase change cryogenic cooling that cycles between solid and liquid states to provide intermittent cooling to the superconductor elements. This periodic phase change enables the superconductor to maintain its levitation properties without requiring continuous electric power supply, thereby resolving the contradiction between maintaining levitation and reducing energy consumption
Solution Approach 2:
The system achieves self-service through the use of solid-liquid phase change material that automatically cycles between phases to cool the superconductor elements. This self-cooling mechanism eliminates the need for external computer control and constant electric power supply, allowing the maglev system to maintain levitation independently while minimizing energy consumption
2Ease of operation
If mechanical switch elements are used for vehicle divergence, then steering control can be achieved, but the switches wear over time, require extensive maintenance, and are inappropriate for high-frequency traffic with intervals of less than one second
Solution Approach 1:
The patent replaces mechanical switch elements with magnetic field-based steering control using superconductor elements and permanent magnets. This non-mechanical approach eliminates wear and maintenance requirements while enabling high-frequency vehicle divergence and convergence operations, directly resolving the contradiction between steering control capability and switch element reliability
Solution Approach 2:
The system changes the operational parameter from mechanical movement to magnetic field interaction. By using superconductor elements that respond to magnetic field changes rather than mechanical switch movements, the system achieves reliable high-frequency steering control without the wear and maintenance issues inherent in mechanical systems
3Loss of energy
If Neodymium permanent magnets are used for levitation, then low drag can be achieved, but the system becomes inherently unstable and requires stabilization by other forces such as rolling elements or EDS stabilization
Solution Approach 1:
The patent employs composite materials by combining superconductor elements with permanent magnets in a unified levitation system. This composite approach integrates the low drag properties of permanent magnets with the stability characteristics of superconductors, eliminating the need for additional stabilization mechanisms while maintaining low energy loss
Solution Approach 2:
The system changes the physical state parameter of the levitation material from normal permanent magnets to superconducting materials cooled by solid-liquid phase change. This parameter change enables the material to exhibit both low magnetic drag and inherent stability, resolving the contradiction between energy efficiency and levitation stability
4Use of energy by moving object
If High Temperature Superconductor Maglev with solid-liquid phase change cooling is implemented, then energy consumption is minimized and mechanical switches are eliminated, but the system requires cryogenic cooling infrastructure and superconductor element management
Solution Approach 1:
The solid-liquid phase change cooling system provides self-service by automatically cycling between phases to cool the superconductor elements without requiring external active cooling mechanisms. This passive cooling approach reduces the operational complexity of the cryogenic system while maintaining the energy efficiency benefits of superconducting maglev
Solution Approach 2:
The system utilizes phase transitions of the cryogenic cooling material between solid and liquid states to provide cooling to the superconductor elements. This phase change mechanism simplifies the cooling infrastructure by eliminating the need for complex active refrigeration systems, thereby reducing device complexity while maintaining low energy consumption
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 solution minimizes energy consumption, reduces construction costs, ensures ultra-stability, and eliminates the need for mechanical or electrical switch elements, enabling efficient and reliable high-speed transportation with reduced levitation force fluctuations during diverge or converge operations.
Implementation Method 1
uses solid-liquid phase change cryogenic cooling
Implementation Method 2
solid-liquid phase change cryogenic cooling
Implementation Method 3
superconductor levitation elements with permanent magnets to achieve stable levitation
Implementation Method 4
High Temperature Superconductor Maglev (HTSM) system
Data Source
AI summary
A method of interchange for an evacuated tube transport system includes tubes for enabling capsule movement within the tubes. The tubes are evacuated and the capsules magnetically levitated within the tubes. The tubes have an interchanges having diverging and converging tubes, respectively. A control system includes divergence force elements having permanent magnets that are selectively orientable polarity to enable capsule control, or electro magnets with polarity selectively switchable to enable capsule path control. The method selectively energizes the force elements to enable the capsule to diverge or converge in an interchange. An interrupter also regulates the force elements. The method activates the force elements and disables deactivation of the force elements before the capsule diverges in the interchange. The method balances divergence forces through center of gravity and through center of lift on receiving a request for divergence. The control system regulates capsule speed, spacing between capsules, and divergence timing.