Coil Device Inductance Adjustment via Eddy Current Interruption
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in maintaining optimal inductance values due to environmental variations and manufacturing inconsistencies, which affect power transmission efficiency and require complex mechanisms to adjust inductance without increasing device size.
Innovation Solution
A coil device with a non-magnetic member featuring an eddy current interrupter, allowing for adjustable inductance by changing the path of eddy currents through moving mechanisms, thereby optimizing inductance without physical changes to the coil, using slits or holes to divert eddy currents and maintain desired inductance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a magnetic-field shield is moved to change inductance, then the inductance can be adjusted, but the device size increases and manufacturing complexity increases
Solution Approach 1:
The patent changes the inductance by moving the non-magnetic member to different positions relative to the coil, thereby changing the eddy current path length and resistance. This allows inductance adjustment without adding magnetic shields or complex mechanical structures, maintaining compact device size while achieving the desired inductance variability.
Solution Approach 2:
The patent extracts the inductance adjustment function from traditional magnetic shield mechanisms and implements it through a non-magnetic member that utilizes eddy currents. By removing the need for magnetic materials and complex shielding structures, the device size is reduced while maintaining the ability to adjust inductance through positional changes of the non-magnetic member.
2Adaptability or versatility
If inductance is adjusted by changing coil structure, then the inductance can be optimized, but the manufacturing precision requirements increase and device complexity increases
Solution Approach 1:
Instead of changing the coil structure to adjust inductance, the patent changes the magnetic environment around the coil by positioning a non-magnetic member at different distances. This approach allows inductance optimization without modifying the coil winding structure, thereby reducing manufacturing precision requirements and simplifying the overall device structure.
3Adaptability or versatility
If multiple components are used to adjust inductance, then the inductance control is more precise, but the device complexity and manufacturing cost increase
Solution Approach 1:
The non-magnetic member serves multiple functions: it provides structural support, guides the magnetic field, and enables inductance adjustment through positional changes. By combining these functions into a single component, the patent reduces the number of parts needed while maintaining precise inductance control, thereby simplifying the device structure and reducing manufacturing 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
The solution effectively adjusts inductance to achieve desired values while minimizing device size, enhancing power transfer efficiency and reducing manufacturing costs by allowing for easy adjustment of inductance using interchangeable non-magnetic members.
Implementation Method 1
a non-magnetic member 56a, 56b having an eddy current interrupter 50B is provided between the coil portion 15B and the base 54
Implementation Method 2
implements wireless power transmission using magnetic coupling between coils such as an electromagnetic induction scheme
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A coil device includes a first coil portion which faces a second coil portion of another coil device and has a conductive wire, and at least one non-magnetic member disposed on an opposite side from a side facing the second coil portion. The non-magnetic member includes an eddy current interrupter for changing a state of an eddy current formed in the non-magnetic member by interrupting a portion of the eddy current.