Anisotropic Magnetic Ribbon Layout for Stable Charging Shielding
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Solution Overview
Problem
Existing sheet-shaped magnetic members used in contactless charging systems, particularly for automobiles, face challenges in maintaining stable magnetic shielding properties and improving coil characteristics (Q1 value) due to anisotropy in nanocrystalline alloy ribbons, which affects the alignment of magnetic flux relative to the direction of anisotropy.
Innovation Solution
The magnetic member is configured with groups of magnetic ribbons or sheets having anisotropy in different directions, ensuring alignment of magnetic flux with the direction of anisotropy by arranging first, second, and third groups with distinct anisotropy orientations, thereby stabilizing magnetic shielding properties and enhancing coil characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If nanocrystalline alloy ribbons are arranged side by side to form a wide sheet-shaped magnetic member, then the width is increased to meet automotive charging demands, but the magnetic shielding properties become unstable due to anisotropy in the ribbons
Solution Approach 1:
The patent applies local quality by arranging nanocrystalline alloy ribbons with different anisotropy directions in different regions of the sheet-shaped magnetic member. Specifically, first ribbons have anisotropy in a first direction, second ribbons have anisotropy in a second direction, and third ribbons have anisotropy in a third direction. This regional differentiation of anisotropy directions ensures that magnetic flux from spiral coils can be effectively shielded regardless of the coil's winding direction, thereby stabilizing magnetic shielding properties while maintaining wide width.
2Reliability
If nanocrystalline alloy ribbons are used to achieve thinner thickness and excellent magnetic properties, then the magnetic performance is improved, but the difficulty of forming them into wide shapes increases
Solution Approach 1:
The patent applies segmentation by dividing the wide sheet-shaped magnetic member into multiple narrow nanocrystalline alloy ribbons arranged side by side. Each ribbon maintains its inherent excellent magnetic properties and thin thickness, while the collective arrangement of multiple ribbons achieves the required wide width. This segmented approach solves the manufacturing difficulty of forming single wide nanocrystalline alloy pieces while preserving superior magnetic characteristics.
3Ease of manufacture
If magnetic ribbons with uniform anisotropy direction are used, then the manufacturing process is simplified, but the magnetic shielding effect is reduced when magnetic flux direction does not align with anisotropy direction
Solution Approach 1:
The patent applies asymmetry by intentionally introducing multiple different anisotropy directions (first, second, and third directions) among the nanocrystalline alloy ribbons rather than using a uniform anisotropy direction. This asymmetric arrangement ensures that regardless of the magnetic flux direction generated by spiral coils, there will always be ribbons with anisotropy aligned to effectively shield the magnetic flux, thereby maintaining high magnetic shielding effect across various operating conditions.
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 reductions in magnetic shielding properties and improves coil characteristics (Q1 value) by aligning magnetic flux with the direction of anisotropy, resulting in enhanced charging efficiency.
Implementation Method 1
magnetic ribbons with anisotropy, in which a value of a DC relative magnetic permeability (μr) is different in a first direction in a plane direction of the magnetic ribbons and in a second direction perpendicular to the first direction
Implementation Method 2
a value of a DC relative magnetic permeability (μr) is different in a first direction in a plane direction of the magnetic ribbons and in a second direction perpendicular to the first direction
Data Source
AI summary
Provided is a sheet-shaped magnetic member. The sheet-shaped magnetic member comprises magnetic ribbons with anisotropy, and includes a first group, a second group, and a third group. The third group is arranged so that a direction of anisotropy of the magnetic ribbons is along a direction different from both a direction of anisotropy of the first group and a direction of anisotropy of the second group. The first group, the second group, and the third group are arranged next to each other.