Divided Ferrite Core for Wireless Power Transfer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In resonant type power supplying systems for vehicles, dividing the core into multiple sections can lead to a decrease in power transmission efficiency, especially when the core is divided into equal widths or perpendicular to the axial direction, due to increased clearance and manufacturing challenges.
Innovation Solution
Dividing the core along the axial direction of the coil and making the end portions narrower than the center portion helps maintain power transmission efficiency, as demonstrated by the use of flat plate-like cores with coils wound around them, where the core is split into multiple sections along the axial direction with shorter end widths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the core is divided into multiple sections to facilitate manufacturing and reduce cost, then ease of manufacture is improved, but power transmission efficiency deteriorates due to increased clearance and gaps
Solution Approach 1:
The core is divided into multiple sections along the axial direction of the coil, allowing separate manufacturing and assembly while maintaining magnetic coupling. This segmentation enables easier production and handling of large cores without significantly compromising power transmission efficiency.
Solution Approach 2:
The core sections are designed with different local characteristics: the central section has a larger width to maintain strong magnetic coupling and minimize gaps, while the end sections have smaller widths. This local quality variation optimizes both manufacturing ease and power transmission efficiency by concentrating the magnetic flux in the central region where it is most effective.
2Device complexity
If the core is divided into equal widths for simplicity, then device complexity is reduced, but power transmission efficiency deteriorates due to suboptimal power loss distribution
Solution Approach 1:
The core sections are designed with asymmetric widths rather than equal widths. The central section has a larger width to optimize magnetic coupling and minimize power losses, while the end sections have smaller widths. This asymmetric design improves power transmission efficiency without significantly increasing device complexity, as the asymmetry follows a simple geometric pattern.
Solution Approach 2:
Different sections of the core are assigned different widths to optimize local magnetic field distribution. The central section with larger width concentrates magnetic flux where it contributes most to power transmission, while smaller end sections reduce unnecessary material and minimize edge effects that cause power losses.
3Ease of manufacture
If the core is divided perpendicular to the axial direction of the coil, then ease of manufacture is improved, but power transmission efficiency deteriorates more significantly compared to axial division
Solution Approach 1:
Instead of dividing the core perpendicular to the axial direction (transverse division), the invention divides the core along the axial direction (longitudinal division). This dimensional change in the division orientation minimizes the creation of gaps and air interfaces that disrupt magnetic flux, thereby maintaining better power transmission efficiency while still enabling modular manufacturing.
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 the decrease in power transmission efficiency, achieving efficiencies comparable to undivided cores, even when the core is divided, by optimizing power loss distribution and maintaining high transmission efficiency.
Implementation Method 1
when a pair of coils are separately disposed in a direction perpendicular to an axial direction of the coils, contactlessly supplies power from one coil to the other coil
Implementation Method 2
one of a pair of resonant coils (coils) electromagnetically resonant with each other
Implementation Method 3
a flat plate-like core; and the coils wound around the core, and the core is divided into a plurality of portions along the axial direction of the coils
Data Source
AI summary
A power supplying system magnetically resonates between a primary resonant coil that configures a primary core unit and a secondary resonant coil that configures a secondary core unit for contactlessly supplying the power. The primary and secondary resonant coils are wound around the primary and secondary ferrite cores respectively, and face each other in the direction perpendicular to the axial direction of the primary and secondary resonant coils when supplying the power. The primary and secondary ferrite cores are divided into a plurality of portions along the axial direction of the primary and secondary resonant coils such that a width of the both end portions is shorter than a width of the center portion.