Segmented Single-Phase Reactor Core for Leakage Flux Control
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Solution Overview
Problem
Conventional single-phase reactors experience significant eddy current losses due to magnetic flux leakage from gaps, which necessitates positioning coils away from these areas to minimize losses, but this approach is inefficient in reducing flux penetration through windings.
Innovation Solution
A single-phase reactor design featuring an outer peripheral iron core with at least four iron core coils, where gaps are strategically placed between adjacent coils near the center, reducing the angle between iron cores to less than 180 degrees, allowing leakage flux to easily enter adjacent cores and minimizing flux penetration through coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If coils are positioned away from the gap vicinity, then eddy current losses are reduced, but magnetic field containment efficiency deteriorates
Solution Approach 1:
The iron core is divided into multiple segments (first iron core with first and second legs, second iron core with third and fourth legs) arranged around the gap. This segmentation allows the magnetic flux to be contained within the segmented core structure rather than leaking into the coil, resolving the contradiction by providing a dedicated flux path that keeps coils away from the gap while maintaining field containment.
Solution Approach 2:
The first and second legs of the first iron core, along with the third and fourth legs of the second iron core, act as intermediary structures that intercept and guide the magnetic flux away from the coil. These intermediary iron core segments provide an alternative path for flux circulation, preventing direct penetration through the coil while maintaining magnetic field integrity.
2Power
If coils are positioned close to the gap, then magnetic field strength increases, but eddy current losses increase
Solution Approach 1:
Different regions of the iron core structure are assigned different functions: the first and second legs and third and fourth legs are positioned to contain and guide magnetic flux, while the coil is positioned in a region optimized for electromagnetic induction. This local differentiation allows the system to achieve strong magnetic field interaction with the coil while preventing harmful flux leakage that causes eddy current losses.
Solution Approach 2:
The patent introduces a spatial dimension by arranging the iron core legs in a specific geometric configuration around the gap. The first and second legs are positioned at different locations relative to the third and fourth legs, creating a three-dimensional flux containment structure that guides magnetic flux through predetermined paths away from the coil, thereby maintaining field strength while reducing losses.
3Device complexity
If iron core legs are arranged parallel to each other, then structural simplicity is maintained, but leakage flux radiates to connection portions
Solution Approach 1:
The patent employs asymmetric arrangement of the iron core legs where the first and second legs are positioned differently relative to the third and fourth legs. This asymmetric configuration prevents the parallel alignment that causes leakage flux to radiate uniformly to connection portions, instead directing the flux through controlled paths that minimize harmful radiation while maintaining reasonable structural complexity.
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 design effectively reduces eddy current losses in coils by minimizing leakage flux penetration, allowing coils to be positioned further from gaps while maintaining efficient magnetic field containment within the outer peripheral iron core.
Implementation Method 1
a coil (172) wound around the second central leg (163)... the first central leg (153) faces the second central leg (163), and a gap G is formed therebetween
Implementation Method 2
a magnetic flux leaks from the vicinity of a gap and penetrates through windings, and then, generates eddy currents in the windings
Data Source
AI summary
A single-phase reactor includes an outer peripheral iron core, at least four iron cores, which are in contact with or coupled to the inner surface of the outer peripheral iron core, and coils which are wound around at least two iron cores of the at least four iron cores. Gaps, which can be magnetically coupled, are each formed between two adjacent ones of the at least four iron cores, or are formed between the at least four iron cores and a central iron core positioned at the center of the outer peripheral iron core.