Superconducting Stator Winding Eddy Current Suppression
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Solution Overview
Problem
In superconducting rotating machines with an air-cored stator, eddy current losses occur due to magnetic flux interlinking across the stator winding, and existing techniques to reduce these losses, such as strand segmentation, decrease the space factor and increase copper losses, thereby limiting power conversion efficiency.
Innovation Solution
The stator is configured with unit windings formed by bundling insulating conductor strands, where the positions of the strands are inverted in specific patterns across different sections of the slots to cancel inter-strand circulating eddy currents, and the windings are connected in series to suppress remaining eddy currents, increasing the space factor and reducing losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If strand segmentation is used to reduce eddy current loss, then eddy current loss is reduced, but space factor of winding in slot is decreased
Solution Approach 1:
The patent divides the conductor into multiple insulated strands bundled together to form a unit winding. This segmentation reduces eddy current loss by breaking up large eddy current paths into smaller ones, while the bundled structure maintains adequate space factor in the slot.
Solution Approach 2:
The patent uses composite structure combining multiple insulated conductor strands bundled together. This composite approach allows the winding to simultaneously achieve low eddy current loss through strand segmentation and adequate space factor through the bundled configuration that fills the slot efficiently.
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 effectively suppresses both in-strand and inter-strand eddy currents, enhancing the efficiency of the superconducting rotating machine by reducing losses and allowing for a more compact design.
Implementation Method 1
an eddy current loss occurs as electric resistance heat caused by an eddy current generated around a magnetic flux
Implementation Method 2
a magnetic flux interlinking across a stator winding disposed in each slot between teeth is revealed
Implementation Method 3
A superconducting rotating machine using a superconducting winding, which causes a superconducting phenomenon
Implementation Method 4
a radial gap type structure in which a rotor is made superconducting (superconducting field winding)
Data Source
AI summary
A unit winding formed by bundling conductor strands in a first slot first sectional region from one end in a stator axial direction toward the other end is turned back so that positions of the insulating conductor strands are inverted in the axial direction. The unit winding is disposed into a second slot third sectional region from the other end in the axial direction toward the one side, and turned back so that the positions of the strands are inverted in a circumferential direction. Then, the turned back unit winding is disposed into the first slot second sectional region from the one end in the axial direction toward the other side, and turned back so that positions of the strands are inverted in the axial direction. The unit winding is disposed in the second slot fourth sectional region from the other end in the axial direction toward the one end.