Reactor Core Permeability Layout for Leakage Flux Reduction
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Solution Overview
Problem
The existing reactor designs with a magnetic core having different relative permeabilities for inner and outer core parts are insufficient in reducing leakage magnetic flux, leading to higher losses.
Innovation Solution
A reactor design featuring a magnetic core with specific regions of varying relative permeability, including a middle core part, side core parts, and end core parts, where the first region has a lower permeability and the second region has a higher permeability, strategically arranged to control magnetic flux flow and reduce leakage, using composite materials and powder compacts to adjust permeability values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the relative magnetic permeability of the outer core part is made higher than that of the inner core part, then the leakage magnetic flux is reduced, but the loss reduction is insufficient
Solution Approach 1:
The magnetic core is divided into multiple regions (first region with lower permeability, second region with higher permeability) at specific locations. The second region is provided in the end core parts to reduce leakage flux, while the first region is provided in the middle core part to control magnetic flux density. This local differentiation of magnetic properties allows simultaneous optimization of leakage reduction and loss minimization.
Solution Approach 2:
The magnetic core uses composite material structures with different relative magnetic permeabilities in different regions. By combining materials with distinct magnetic properties (first region: lower permeability, second region: higher permeability), the design achieves both leakage flux reduction and energy loss reduction that cannot be accomplished with uniform material properties.
2Productivity
If the magnetic core structure is simplified with fewer parts, then the productivity is improved, but the ability to control magnetic flux flow is reduced
Solution Approach 1:
The magnetic core is segmented into distinct functional regions (first region and second region) with different magnetic permeabilities. This segmentation allows independent optimization of each region's properties to control magnetic flux flow patterns, achieving reliable flux control while maintaining a relatively simple overall core structure that can be manufactured efficiently.
Solution Approach 2:
Different regions of the magnetic core are assigned different local qualities (magnetic permeability values) to perform specific functions. The second region with higher permeability is located where flux concentration is needed, while the first region with lower permeability is placed where flux density control is required, enabling precise magnetic flux management without complex structural designs.
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 leakage magnetic flux, lowers losses, and improves the productivity of the magnetic core by integrating core parts with optimized permeability distribution.
Implementation Method 1
the magnetic core having a first region and a second region having a higher relative magnetic permeability than the first region... the second region including a base end region and a projecting region
Implementation Method 2
the magnetic core having a first region and a second region having a higher relative magnetic permeability than the first region
Data Source
AI summary
In this reactor: a coil has a winding part; a magnetic core has a middle-core part, two side-core parts, and two end-core parts; the middle-core part has a portion disposed at the inner side of the winding part; the two side-core parts are disposed side by side with the middlecore part at the outer sides of the winding part; and the two end-core parts are respectively disposed at the outer sides of the ends of the winding part so as to connect the middle-core part and the two side-core parts. The magnetic core has a first region and a second region having a relative permeability higher than that of the first region. The first region has two corners formed from the middle-core part and the two end-core parts. The second region includes a base-end region and a projecting region. The base-end region extends in the two end-core parts so as to straddle over the axial line of the middle-core part and extends along the direction in which the middle-core part and the two side-core parts are arranged side by side, whereas the projecting region projects from the base-end region to the middle-core part.