Interpenetrating Wireless Power Coils for Strong Coupling
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Solution Overview
Problem
Existing wireless power transmission devices face challenges in maintaining strong and constant electromagnetic coupling within a motion range due to spatial separation of coils, leading to inefficient power transfer and size limitations.
Innovation Solution
The design features a first coil and a second coil electromagnetically coupled without contact, where one coil extends through the space defined by the other, utilizing magnetic cores made of soft magnetic materials like ferrite or plasto-ferrite to enhance coupling strength, allowing for smaller device size with improved coupling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If two coils are spatially separated and independent from each other over a coupling distance, then the device structure is simple, but the coupling strength between the coils is small and the effective coupling distance is very short
Solution Approach 1:
The patent applies nesting by having one coil pass through the space defined by the other coil, creating a nested configuration where the coils are interpenetrating rather than separate. This nested arrangement increases the magnetic coupling between coils without requiring the coils to be physically large, thereby resolving the contradiction between coupling strength and device size.
Solution Approach 2:
The patent transitions from a linear separation arrangement to a three-dimensional interpenetrating arrangement where one coil extends through the space of the other. This dimensional change allows the coils to maintain strong coupling over a longer effective distance without increasing the overall device footprint, addressing the contradiction between coupling strength and coupling distance.
2Strength
If the diameter and thickness of the coils are increased to obtain stronger electromagnetic coupling and a longer coupling distance, then the coupling strength improves, but the device size becomes excessive
Solution Approach 1:
By nesting one coil within the space defined by the other coil, the patent achieves strong electromagnetic coupling without increasing the external dimensions of the device. The interpenetrating configuration maximizes the magnetic field interaction between coils while maintaining a compact overall size, thus resolving the contradiction between coupling strength and device volume.
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement where one coil passes through the other, creating an interpenetrating structure. This dimensional approach allows strong coupling to be achieved without proportionally increasing coil diameter and thickness, thereby maintaining a compact device size while improving coupling strength.
3Stability of the object's composition
If the two coils are separated by a predetermined distance, then the device has structural simplicity, but it is very difficult to maintain constant electric characteristics within a motion range
Solution Approach 1:
The nested configuration where one coil passes through the space of the other creates a more stable magnetic coupling that is less sensitive to relative motion between coils. This interpenetrating arrangement maintains more consistent electric characteristics over a motion range compared to simple separation, while adding minimal structural complexity.
Solution Approach 2:
By transitioning from planar separation to three-dimensional interpenetration, the patent creates a coil arrangement that maintains stable electric characteristics during motion. The vertical or axial passing-through configuration provides better coupling stability compared to lateral separation, reducing the difficulty of maintaining constant electric properties within a motion range.
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 maintains a strong and constant electromagnetic coupling within a motion range without increasing coil size, enabling efficient power transfer and addressing security, lifetime, and maintenance issues associated with physical wear.
Implementation Method 1
a first coil (11) and a second coil (21) spaced apart from and electromagnetically coupled to the first coil (11)
Implementation Method 2
utilizing magnetic cores made of soft magnetic materials like ferrite or plasto-ferrite to enhance coupling strength
Data Source
AI summary
A wireless power transmission device is disclosed. The wireless power transmission device comprises a first coil and a second coil electromagnetically coupled to the first coil without contacting the first coil. A portion of one of the first coil and the second coil extends through a space defined by the other of the first coil and the second coil.