Oxide Superconducting Bulk Magnet with Multi-Ring Reinforcement
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Solution Overview
Problem
Oxide superconducting bulk magnets face breakage due to both electromagnetic stress and the quenching phenomenon, particularly during magnetization, which has not been adequately addressed in existing technologies, limiting their ability to generate strong magnetic fields.
Innovation Solution
A metal with high thermal conductivity is disposed around the oxide superconducting bulk body to ensure sufficient thermal contact, reducing thermal and magnetic instability that can trigger quenching, and a multi-ring structure is used to provide mechanical reinforcement against electromagnetic stress, employing a field-cool magnetization method to stabilize the magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a strong magnetic field is generated in a compact space using an oxide superconducting bulk magnet, then the magnetic field strength is improved, but electromagnetic stress causes the superconducting bulk body to break
Solution Approach 1:
The invention uses a composite structure consisting of an oxide superconducting bulk body combined with a metal ring having high thermal conductivity. This composite configuration allows the superconducting material to generate strong magnetic fields while the metal ring provides mechanical reinforcement and thermal management, resolving the contradiction between magnetic field strength and mechanical strength
Solution Approach 2:
The metal ring acts as an intermediary element between the superconducting bulk body and the external environment. It mediates the thermal and mechanical stresses by providing a high-conductivity pathway for heat dissipation and distributing electromagnetic forces, thereby preventing breakage while maintaining strong magnetic field generation
2Power
If the superconducting bulk body is cooled in a magnetic field to generate strong magnetic field, then the magnetic field generation capability is improved, but thermal instability triggers quenching phenomenon causing breakage
Solution Approach 1:
The metal ring with high thermal conductivity serves as a thermal intermediary during the field-cool magnetization process. It provides a stable thermal pathway that prevents localized thermal instabilities and quenching phenomena, ensuring reliable operation during magnetic field generation
Solution Approach 2:
The invention changes the thermal conductivity parameter of the system by introducing a metal ring with high thermal conductivity. This parameter change stabilizes the thermal field during magnetization, preventing quenching while maintaining the ability to generate strong magnetic fields
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 prevents breakage of the superconducting bulk body under high magnetic fields, enabling the generation of a sufficient total magnetic flux and mechanical reinforcement, thus achieving stable magnetic field generation without cracking.
Implementation Method 1
a metal ring 130 having a high thermal conductivity is disposed around the oxide superconducting bulk body 110 in a sufficient thermal contact
Implementation Method 2
an oxide superconducting material wherein RE 2 BaCuO 5 phase is dispersed in a monocrystalline REBa 2 Cu 3 O 7-x phase has a high critical current density
Implementation Method 3
it can be used as a superconducting bulk magnet which is excited by cooling in a magnetic field to generate a strong magnetic field
Implementation Method 4
compressive stress due to the metal ring is applied to the superconducting bulk body when being cooled
Implementation Method 5
a large electromagnetic stress will act inside the superconducting bulk body. This electromagnetic stress is also referred to as a hoop stress because it acts to spread the confined magnetic field
Data Source
Figure 1A
Figure 1B
Figure 2~3A
AI summary
The present invention provides an oxide superconducting bulk magnet which can obtain a sufficient amount of total magnetic flux, by preventing the superconducting bulk body from being broken due to electromagnetic stress and quenching phenomenon to enable magnetization by a strong magnetic field. An oxide superconducting bulk magnet comprising an oxide superconducting bulk body wherein RE2BaCuO5 is dispersed in a monocrystalline RE1Ba2Cu3Oy; and an outer peripheral reinforcing ring fitted to the outer periphery of the oxide superconducting bulk body, wherein the outer peripheral reinforcing ring is made of a plurality of metal rings having a multiple ring structure in the radial direction, at least one of the plurality of metal rings has a thermal conductivity of 20 W/(m·K) or more at a temperature of 20 to 70 K and at least one of the plurality of metal rings has a higher strength than the metal ring having a thermal conductivity of 20 W/(m·K) or more.