Transformer Winding Transposition for Axial Loss Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Transformers with multiple parallel conductors experience axial eddy losses and recirculating currents, leading to overheating and potential electrical failure due to the radial width of the conductors and their configuration.
Innovation Solution
A transformer design featuring at least two conductors arranged radially adjacent to each other with an insulating layer, where one conductor is positioned radially inwardly and then outwardly along the winding portion, reducing recirculating currents and axial losses by transposing their positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If multiple parallel conductors are used to reduce axial eddy losses, then axial losses are reduced, but overheating occurs due to recirculating currents leading to insulation degradation
Solution Approach 1:
The winding is divided into multiple separate conductors (first conductor and second conductor) arranged radially adjacent to each other, with each conductor having reduced radial width compared to a single thick conductor. This segmentation reduces axial eddy losses while the specific arrangement of multiple conductors helps manage recirculating currents.
Solution Approach 2:
The first and second conductors are arranged asymmetrically with respect to the magnetic core, where the first conductor is positioned at a first radial distance and the second conductor at a second radial distance. This asymmetric positioning disrupts the symmetry of magnetic flux distribution, thereby reducing recirculating currents and associated losses.
2Loss of energy
If conductors are arranged radially adjacent to each other, then axial eddy losses are reduced, but device complexity increases due to multiple conductors and insulating layers
Solution Approach 1:
The winding is divided into multiple separate conductors (first conductor and second conductor) arranged radially adjacent to each other, with each conductor having reduced radial width compared to a single thick conductor. This segmentation reduces axial eddy losses while the specific arrangement of multiple conductors helps manage recirculating currents.
Solution Approach 2:
Multiple conductors are combined within a single winding structure, with the first conductor and second conductor arranged radially adjacent to each other and interconnected at their ends. This merging approach achieves the benefits of multiple conductors while maintaining a compact integrated structure.
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 reduces axial losses and prevents overheating, thereby enhancing the performance and longevity of the transformer by minimizing extra losses and electrical failures.
Implementation Method 1
arranged radially adjacent to each other in each winding portion with the interposition of an insulating layer
Implementation Method 2
The configuration of the first conductor being arranged radially inwardly with respect to the second conductor for part of of each winding portion length, and radially outwardly with respect to the second conductor for another part of each winding portion length leads to the transposition of the first conductor and the second conductor along the length of each winding portion
Data Source
AI summary
A transformer may comprise a winding wrapped around a magnetic core, the winding having at least one winding portion extending between the magnetic core and the exterior of the winding in radial direction. The winding may comprise at least a first conductor and at least a second conductor, arranged radially adjacent to each other in each winding portion with the interposition of an insulating layer, wherein the first conductor is arranged radially inwardly with respect to the second conductor for part of each winding portion length, and radially outwardly with respect to the second conductor for another part of each winding portion length.