Radial-Gap Superconducting Machine Magnetizing Apparatus
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Solution Overview
Problem
The axial-gap type superconducting synchronous machine faces limitations in magnetic flux density due to the use of pulse magnetization, which requires a large-scale magnetizing apparatus, compromising practical utility and efficiency, especially when attempting static magnetic field magnetization that necessitates a large-sized coil surrounding the rotor, leading to increased size and complexity.
Innovation Solution
A radial-gap type superconducting synchronous machine design with a stator and rotor configuration that includes a superconductor on the rotor's periphery, where the magnetic pole's center is closer to the stator, and a ferromagnet on the rotational axis, allowing for effective magnetization using a magnetizing apparatus with a coil positioned outside the rotor, enabling concentrated magnetic flux without the need for a large-sized coil surrounding the superconductor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If static magnetic field magnetization is used to increase captured magnetic flux in the superconductor, then the magnetic flux density increases, but the magnetizing apparatus becomes large-sized and loses practical utility
Solution Approach 1:
The patent transitions from axial-gap configuration to radial-gap configuration, fundamentally changing the spatial dimension of magnetic flux flow. In the radial-gap type, magnetic flux flows radially from the rotor to stator, allowing the magnetizing coil to be positioned outside the rotor periphery rather than surrounding it axially. This dimensional change enables effective magnetization with a compact apparatus that does not require the large-sized coil structure needed in axial-gap designs.
Solution Approach 2:
The patent introduces a ferromagnetic material as an intermediary between the superconductor and the magnetizing coil. The ferromagnetic material concentrates and guides magnetic flux lines, enhancing the coupling between the external magnetizing coil and the superconductor. This intermediary enables effective magnetization with a smaller coil by improving magnetic flux density and distribution in the superconductor without requiring the coil to be large-sized.
2Quantity of substance
If a large-sized coil surrounds the rotor for magnetization, then sufficient magnetic flux is introduced, but the device size and structural complexity increase
Solution Approach 1:
The patent applies local quality by concentrating magnetic flux where it is most needed - at the rotor periphery where the superconductor is located. The radial-gap configuration and ferromagnetic material work together to focus magnetic flux lines radially into the superconductor, achieving high flux density locally without requiring a large-sized surrounding coil. This localized flux concentration enables effective magnetization with a more compact apparatus.
3Force
If the magnetic pole center is closer to the stator, then magnetic field action on the stator is enhanced, but the superconductor positioning becomes more constrained
Solution Approach 1:
The patent employs preliminary action by pre-positioning the ferromagnetic material and configuring the radial-gap structure before magnetization. This preliminary configuration creates optimal magnetic flux paths and field distribution, allowing the superconductor to be positioned effectively without requiring complex adjustments. The pre-configured structure guides magnetic flux lines to act strongly on the stator while maintaining ease of superconductor positioning.
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 allows for high-efficiency magnetization of the superconductor with a sufficient captured magnetic flux, increasing torque and power output while maintaining practical utility by reducing the size and complexity of the magnetizing apparatus, allowing for efficient magnetic field action on the stator and stable superconductor positioning.
Implementation Method 1
A bulk superconductor, which is a mass of superconductor crystals, can capture magnetic flux lines at pinning points therein when a magnetic field (magnetic flux) is introduced into the bulk superconductor at a temperature which is not more than a critical temperature at which the matrix superconductor shows a superconducting transition.
Implementation Method 2
a bulk superconductor, which is a mass of superconductor crystals, can capture magnetic flux lines at pinning points therein when a magnetic field (magnetic flux) is introduced into the bulk superconductor at a temperature which is not more than a critical temperature at which the matrix superconductor shows a superconducting transition
Implementation Method 3
a ferromagnetic material 28, and wherein the ferromagnetic material 28 concentrates a plurality of magnetic flux lines W from the magnetizing apparatus 100 so as to pass through the bulk aggregate 24
Data Source
AI summary
A radial-gap type superconducting synchronous machine 1 is prepared which includes a rotor 20 having, on its peripheral side, a convex magnetic pole 21 which includes, at its distal end part, bulk superconductors 30. When viewed in the direction of the rotational axis C1 of the rotor 20, the magnetic pole center side of the bulk superconductors 30 is disposed nearer to a stator 10 than the magnetic pole end side of the bulk superconductors 30. A ferromagnet 28 is disposed on the rotational axis C1 side of the bulk superconductors 30. A magnetizing apparatus 100 is disposed outside the bulk superconductors 30 in the radial direction of the rotor 20. Magnetization of the bulk superconductors 30 is performed by directing magnetic flux lines from the magnetizing apparatus 100 toward the bulk superconductors 30.