Reactor Core with Non-Uniform Cross Section for DC Superimposition
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Solution Overview
Problem
Conventional reactor cores have a uniform cross-sectional shape, leading to increased size and cost, making miniaturization and weight reduction difficult, and failing to improve DC superimposition characteristics in high current regions.
Innovation Solution
The reactor core is designed with a non-winding portion having a smaller cross-sectional area than the winding portion, optimizing the core shape by reducing areas through which minimal magnetic flux passes, allowing for miniaturization and improved DC superimposition characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the core is configured with a uniform cross-sectional area, then the structural simplicity is maintained, but the core size becomes large and costs increase
Solution Approach 1:
The core cross-sectional area is made non-uniform by reducing the area in the non-winding portion compared to the winding portion. This local variation optimizes the magnetic path efficiency and reduces the overall core volume while maintaining structural feasibility. The different cross-sectional areas in different portions of the core create optimal magnetic flux distribution.
2Volume of stationary object
If the core cross-sectional area is reduced for miniaturization, then the core volume decreases, but the DC superimposition characteristics deteriorate
Solution Approach 1:
The core is designed with different cross-sectional areas in different portions: the winding portion maintains a larger cross-sectional area to support high current and good DC superimposition characteristics, while the non-winding portion has a reduced cross-sectional area to minimize volume. This local differentiation allows the core to achieve both miniaturization and reliable DC superimposition performance.
Solution Approach 2:
Instead of uniformly reducing the entire core cross-sectional area, only the non-winding portion is reduced. This partial action allows the critical winding portion to maintain sufficient area for proper DC superimposition characteristics while the non-critical non-winding portion is minimized for volume reduction.
3Reliability
If the core size is increased to improve DC superimposition characteristics, then the reliability improves, but the weight and cost increase
Solution Approach 1:
The core uses non-uniform cross-sectional areas where the winding portion has sufficient area for good DC superimposition characteristics while the non-winding portion has reduced area. This localized optimization maintains reliability in critical areas while minimizing overall weight by reducing material in non-critical areas.
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 achieves miniaturization, weight reduction, and cost-effectiveness while enhancing DC superimposition in high current regions, providing higher impedance and safety in vehicle-mounted reactors.
Implementation Method 1
a cross-sectional area in a direction orthogonal to a magnetic path of the non-winding portion of the core is made smaller than a cross-sectional area in a direction orthogonal to the magnetic path of the winding portion
Data Source
AI summary
A reactor part includes at least a winding and a magnetic substance core, in which the core includes a pair of winding portions around each the winding is wound, and a non-winding portion around which no winding is wound, wherein a cross-sectional area in a direction orthogonal to a magnetic path of the non-winding portion of the core is made smaller than a cross-sectional area in a direction orthogonal to a magnetic path of the each of winding portions.