Superconducting Rotor Winding with Direct Cooling Tubes
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Solution Overview
Problem
Superconducting rotating electrical machines face issues with deformation of components and inefficient cooling due to the bending of high temperature superconducting films, leading to reduced current carrying capacity and increased risk of cracks.
Innovation Solution
The design incorporates tubes on the rotor winding to house superconducting wires, allowing direct heat exchange with a cooling fluid, and a multi-layered high temperature superconducting film structure with symmetrical stabilizer layers to prevent bending and cracking, using non-metallic supporters to maintain the rotor winding's shape and enhance cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a long superconducting wire is wound in a circumferential direction to form a racetrack-shaped rotor winding, then the current carrying capacity is increased, but the linear section of the rotor winding deforms due to being bent by its own weight
Solution Approach 1:
The rotor winding is divided into multiple sections supported by separate support ribs at different angular positions around the rotor. This segmentation prevents any single long linear section from bending under its own weight, while still maintaining the overall racetrack shape and high current carrying capacity through the distributed superconducting wires.
2Device complexity
If the rotor winding is disposed on the outer surface of the rotary shaft and cooled through heat conduction using the rotary shaft as an intermediate, then the structural simplicity is maintained, but the cooling efficiency becomes insufficient
Solution Approach 1:
Cooling ribs are introduced as intermediary structures that directly contact both the superconducting wires and the cooling fluid. These ribs act as thermal mediators, providing dedicated heat conduction paths from the rotor winding to the cooling fluid, significantly improving cooling efficiency while maintaining relative structural simplicity through the integration with existing rotor components.
3Power
If the high temperature superconducting film is deposited on a metallic substrate, then the current carrying capacity is enhanced, but cracks are generated on the superconductor due to the lack of ductility and bending of the substrate
Solution Approach 1:
A multi-layer composite structure is employed consisting of a flexible metallic substrate, a buffer layer, and a high-temperature superconducting film layer. The buffer layer acts as a transition layer that accommodates thermal expansion differences and mechanical stress, preventing cracks in the brittle superconducting film while maintaining the high current carrying capacity enabled by the metallic substrate and superconducting material.
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 improves heat exchange efficiency, prevents deformation and cracking of superconducting wires, and enhances the current carrying capacity of the machine, enabling larger capacity machines with improved reliability.
Implementation Method 1
tubes disposed on a circumference of the rotary shaft and each forming a passage for a cooling fluid therein, superconducting wires accommodated within the tubes, and a cooling fluid flowing through the inside of the tubes
Implementation Method 2
A refrigerant is supplied into the rotary shaft 20 to cool the rotor winding 30 by heat conduction using the rotary shaft 20 as an intermediate
Implementation Method 3
a superconducting rotating electrical machine using superconducting wires has been introduced. The machine may remarkably reduce a loss, compared with a normal conducting rotating electrical machine using copper wires
Data Source
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AI summary
The present disclosure relates to a superconducting rotating electrical machine and a manufacturing method for a high temperature superconducting film thereof. The superconducting rotating electrical machine includes a stator, and a rotor rotatable with respect to the stator, the rotor having a rotary shaft and a rotor winding. Here, the rotor winding includes tubes disposed on a circumference of the rotary shaft and each forming a passage for a cooling fluid therein, superconducting wires accommodated within the tubes, and a cooling fluid flowing through the inside of the tubes. This configuration may allow for direct heat exchange between the superconducting wires and a refrigerant, resulting in improvement of heat exchange efficiencies of the superconducting wires.