Non-magnetic MI Cable Termination Sleeve for Magnetic Field Isolation
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Solution Overview
Problem
MI cables in high-temperature and strong magnetic fields face issues with electromagnetic induction and magnetic field disturbances due to the materials used in their construction, whether non-magnetic or magnetic substances, affecting signal and power transmission.
Innovation Solution
The use of non-magnetic stainless steel for the sheath and titanium for the termination sleeve, combined with a double helix configuration for the conducting wires, along with silver soldering and nickel-phosphorus plating to enhance adhesion and minimize magnetic field interference, creates a termination sleeve-equipped MI cable that isolates the interior from external magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If magnetic substance is used for the sheath and termination sleeve to shield magnetic fields, then magnetic field shielding is improved, but electromagnetic induction and magnetic field disturbance occur due to currents flowing through the conductors
Solution Approach 1:
The patent extracts the magnetic substance (ferromagnetic material) from the sheath and termination sleeve components, replacing them with non-magnetic materials. This eliminates the magnetic field shielding function while preventing the generation of additional magnetic fields and electromagnetic induction, as the non-magnetic materials do not become magnetized by external fields nor do they concentrate magnetic flux.
Solution Approach 2:
The patent changes the magnetic property parameter of the sheath and termination sleeve materials from magnetic (ferromagnetic) to non-magnetic. This parameter change resolves the contradiction by eliminating both the magnetic field shielding effect and the harmful electromagnetic induction effects that occur when currents flow through conductors in magnetic materials.
2Object-generated harmful factors
If non-magnetic substance is used for the sheath and termination sleeve to avoid electromagnetic induction, then magnetic field disturbance is reduced, but magnetic field enters these components causing signal disturbance
Solution Approach 1:
The patent introduces magnetic shielding material as an intermediary layer between the external magnetic field and the conducting wires. This shielding layer blocks or redirects external magnetic field lines, preventing them from penetrating to the conductors and causing electromagnetic induction, while the non-magnetic sheath and termination sleeve maintain their low magnetic field generation properties.
Solution Approach 2:
The patent employs a nested structure where the magnetic shielding material is positioned within the sheath, surrounding the conducting wires. This nested arrangement creates multiple protective layers: the non-magnetic sheath provides structural support and minimal magnetic field generation, while the inner magnetic shielding layer actively blocks external magnetic fields from reaching the conductors.
3Strength
If ceramic terminal with metallization and plating is used to improve adhesion, then bonding strength is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies metallization and plating layers to the ceramic terminal surface in advance, before the final assembly and soldering processes. This preliminary preparation of the ceramic surface creates a metallized interface that significantly improves adhesion to metal components, while the standardized multi-layer coating process makes the manufacturing sequence more systematic and controllable.
Solution Approach 2:
The patent uses a composite structure for the ceramic terminal, combining ceramic material with metallization and plating layers. This composite approach leverages the electrical insulation properties of ceramic while adding the electrical conductivity and bonding capabilities of metal layers, creating a multi-functional component that achieves both strong adhesion and electrical performance.
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 minimizes the influence of external magnetic fields on signal and power transmission while maintaining insulation integrity and adhesion at high temperatures, preventing magnetic field disturbances and moisture ingress.
Implementation Method 1
the silver soldering between the ceramic terminal and the sleeve tube, and between the ceramic terminal and each of the terminal tubes is performed after a surface of the ceramic terminal is metallized with titanium and plated with nickel-phosphorus
Implementation Method 2
a signal or electric power to be transmitted is disturbed by electromagnetic induction caused by fluctuations in a magnetic field
Implementation Method 3
the sheath of the MI cable, as well as the sleeve tube and the terminal tubes of the termination sleeve are made of a non-magnetic substance (a material that does not become magnetized in a magnetic field)
Implementation Method 4
the sheath 3 and the sleeve tube 4 are welded around the entire circumference at a weld 14
Data Source
AI summary
The materials used for a termination sleeve-equipped MI cable according to the present invention, including bonded portions formed with silver solder, are all non-magnetic substances, and therefore, there will be no disturbance of an external magnetic field due to the presence of a magnetic substance. Furthermore, a pair or a plurality of pairs of conducting wires of the MI cable that transmit a signal or electric power are each formed in a double helix configuration, and therefore the generation of a magnetic field due to the currents flowing through the conducting wires and the influence from an external magnetic field on a signal or electric power to be transmitted can be minimized by using the two conducting wires of each pair as a single round-trip signal line or as a single round-trip electric power line.