Segmented Ferrite Coil Blocks for Wireless Power Transmission
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Solution Overview
Problem
The existing wireless power transmission systems using elongated rod-like ferrite cores face challenges in fixing the cores and maintaining coil characteristics due to the need for additional frames, which complicates the reduction of coil weight and increases complexity.
Innovation Solution
The use of magnetic core blocks with grooves or openings aligned along the magnetic flux direction allows for easier fixation and reduced weight, while maintaining inductance and coupling coefficients by optimizing the ferrite filling factor and relative permeability, thereby preventing degradation of coil characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If elongated rod-like ferrite cores are used to reduce coil weight, then weight is reduced, but fixation becomes difficult and requires additional frames
Solution Approach 1:
The magnetic core is divided into multiple block-shaped ferrite cores arranged in an array, replacing the traditional single elongated rod-like ferrite core. This segmentation allows each block to be individually positioned and fixed more easily while maintaining the overall magnetic flux path, thus reducing fixation difficulty without compromising weight reduction benefits
Solution Approach 2:
The block-shaped ferrite cores are arranged in a nested array configuration where multiple blocks are positioned within a compact spatial arrangement. This nesting approach allows the cores to be fixed within a reduced volume space, eliminating the need for additional frames while maintaining effective magnetic coupling
2Weight of moving object
If ferrite cores are arranged at regular intervals to reduce weight, then weight is reduced, but device complexity increases due to need for frames
Solution Approach 1:
The core structure is segmented into discrete block-shaped ferrite units that can be arranged in regular intervals without requiring a continuous frame structure. Each block is independently positioned and secured, simplifying the overall structural complexity while maintaining weight reduction
Solution Approach 2:
The block-shaped ferrite cores serve multiple functions: they provide magnetic flux conduction, structural support, and positioning references for adjacent blocks. This multi-functionality eliminates the need for separate frame structures, reducing device complexity while maintaining mechanical integrity
3Volume of moving object
If ferrite filling factor is reduced to decrease volume, then volume is reduced, but coil characteristics may degrade
Solution Approach 1:
The block-shaped ferrite cores are strategically positioned and sized to concentrate magnetic flux in critical regions while allowing reduced ferrite volume in non-critical areas. This local optimization maintains essential magnetic coupling characteristics while achieving overall volume reduction
Solution Approach 2:
The magnetic core structure combines block-shaped ferrite materials with air gaps or non-magnetic materials in a composite arrangement. This composite structure allows optimization of the ferrite filling factor to reduce volume while maintaining effective magnetic flux paths through the block array configuration, preserving coil characteristics
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 approach reduces the weight and volume of the coil, simplifies the fixation process, and maintains the performance of the wireless power transmission system even at reduced ferrite filling factors, ensuring efficient power transmission.
Implementation Method 1
Each block is arranged so as to make the groove or the opening extend along a direction of magnetic flux
Implementation Method 2
a wireless power transmission system configured to wirelessly transmit power by mutual inductance between a power transmitting inductor and a power receiving inductor
Data Source
AI summary
In one embodiment, a coil includes a magnetic core and a winding. The magnetic core includes at least one block provided with a groove or an opening. Each block is arranged so as to make the groove or the opening extend along a direction of magnetic flux. The coil is used as a power transmitting coil or a power receiving coil.