Radial Magnetic Sheet Layout for Stable Circling Coil Shielding
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Solution Overview
Problem
Existing sheet-shaped magnetic members using nanocrystalline alloy ribbons face challenges in maintaining consistent magnetic shielding characteristics due to anisotropy, which affects the Q1 and Q2 values, especially when used in non-contact charging circuits with circling coils.
Innovation Solution
A sheet-shaped magnetic member is designed with multiple elongated magnetic sheet pieces having different magnetic characteristics in the longitudinal and width directions, arranged radially to align the magnetic flux direction with the anisotropy, ensuring consistent magnetic shielding properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If nanocrystalline alloy ribbons are arranged to form a wide sheet-shaped magnetic member, then the width is increased to meet large current requirements, but the magnetic characteristics become inconsistent due to anisotropy between longitudinal and width directions
Solution Approach 1:
The sheet-shaped magnetic member is divided into multiple magnetic sheet pieces (first magnetic sheet pieces and second magnetic sheet pieces) with different orientations. The first magnetic sheet pieces have their longitudinal directions oriented in a first direction, while the second magnetic sheet pieces have their longitudinal directions oriented in a second direction different from the first direction. This segmentation allows each piece to contribute its superior magnetic characteristics in the longitudinal direction to different regions of the overall structure, achieving consistent magnetic shielding performance across the wide area.
Solution Approach 2:
Different regions of the sheet-shaped magnetic member are assigned different orientations of magnetic sheet pieces according to the local magnetic flux distribution. By arranging magnetic sheet pieces with specific longitudinal directions in specific regions, the structure optimizes magnetic shielding characteristics locally while maintaining overall consistency across the wide area.
2Reliability
If nanocrystalline alloy ribbons are used to achieve excellent magnetic characteristics, then the Q1 and Q2 values are improved, but the difficulty of forming wide shapes increases
Solution Approach 1:
Instead of attempting to form a single wide nanocrystalline alloy ribbon, the invention segments the wide magnetic member into multiple narrower magnetic sheet pieces that can be manufactured separately and then assembled. This approach maintains the excellent magnetic characteristics of narrow nanocrystalline ribbons while achieving the required wide overall dimensions through the combination of multiple pieces.
3Reliability
If magnetic sheet pieces with anisotropy are arranged radially to align magnetic flux direction with anisotropy, then magnetic shielding characteristics are stabilized, but the device complexity increases
Solution Approach 1:
The invention employs asymmetric arrangement of magnetic sheet pieces with different orientations (first direction and second direction) to match the asymmetric magnetic flux distribution in non-contact charging circuits. This asymmetric configuration optimizes magnetic shielding performance by aligning the anisotropic magnetic characteristics of each sheet piece with the local magnetic flux direction, achieving stable shielding characteristics despite the increased arrangement 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 configuration stabilizes the magnetic shielding characteristics by aligning the magnetic flux direction with the anisotropy, enhancing the Q1 and Q2 values, thereby improving the performance of circling coils in non-contact charging systems.
Implementation Method 1
aligning the magnetic flux direction with the anisotropy
Implementation Method 2
different magnetic characteristics in the longitudinal and width directions; aligning the magnetic flux direction with the anisotropy
Implementation Method 3
Q2 value is a ratio (μ′/μ′′) of a real part (μ′) to an imaginary part (μ′′) of complex permeability
Implementation Method 4
stabilizes the magnetic shielding characteristics; enhancing the Q1 and Q2 values
Data Source
AI summary
There is provided a sheet-shaped magnetic member that easily suppresses deterioration of magnetic shielding characteristics for a circling coil. The sheet-shaped magnetic member of the present disclosure includes a plurality of magnetic sheet pieces each formed in an elongated shape and having anisotropy in which magnetic characteristics in a longitudinal direction and magnetic characteristics in a width direction intersecting with the longitudinal direction are different, in which the plurality of magnetic sheet pieces are radially arranged.