Cross-Axis Transmitting Coils for Magnetic Field Alignment
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Solution Overview
Problem
Conventional wireless power transfer devices cannot control the direction of the magnetic field, making it cumbersome to align the magnetic field with the secondary coil for efficient energy transfer, requiring physical movement of the coils.
Innovation Solution
A wireless power transfer system with two transmitting coils oriented along different axes and a nonmagnetic material to decouple them, allowing for the control of the magnetic field direction by adjusting the AC currents and phase difference between the coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single primary coil is used to generate the magnetic field, then the device structure is simple, but the direction of the magnetic field cannot be controlled
Solution Approach 1:
The single primary coil is divided into two separate transmitting coils (first transmitting coil and second transmitting coil) oriented along different axes. Each coil can be independently controlled to generate magnetic fields in different directions, enabling flexible magnetic field direction control while maintaining relatively simple individual coil structures.
Solution Approach 2:
The patent introduces spatial dimensionality by orienting the two transmitting coils along different axes (first axis and second axis). This dimensional arrangement allows the magnetic field direction to be controlled by selecting which coil is activated, transforming a single-direction field into a multi-directional controllable field.
2Reliability
If the primary coil is physically moved or reoriented to align with the secondary coil, then the magnetic field alignment is improved, but the operation becomes cumbersome and inconvenient
Solution Approach 1:
The patent replaces the mechanical system of physically moving or reorienting coils with an electrical control system. By independently controlling the AC currents applied to the two transmitting coils, the magnetic field direction can be changed without any mechanical movement, thereby maintaining high energy transfer efficiency while greatly simplifying operation.
Solution Approach 2:
The patent introduces dynamic control capability by enabling independent adjustment of AC currents to the two coils. This allows the magnetic field direction to be dynamically changed through electrical control rather than static mechanical positioning, improving both operational ease and adaptability to different secondary coil orientations.
3Ease of operation
If two transmitting coils oriented along different axes are used, then the magnetic field direction can be controlled, but the coils may interfere with each other
Solution Approach 1:
The patent introduces a nonmagnetic material as an intermediary between the two transmitting coils. This material acts as a magnetic decoupling element that prevents magnetic field interference between the coils while allowing both coils to function independently. The nonmagnetic material blocks unwanted magnetic coupling, ensuring that each coil generates its magnetic field without interference from the other.
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
Enables efficient and flexible alignment of the magnetic field with the secondary coil, improving energy transfer efficiency without manual adjustment of the coils.
Implementation Method 1
A primary coil may be driven with AC current to generate an oscillating magnetic field
Implementation Method 2
a nonmagnetic material magnetically decoupling the first transmitting coil from the second transmitting coil in an area of overlap between the first and second transmitting coils
Implementation Method 3
the magnetic field can generate a current in a secondary coil in proximity to the primary coil via electromagnetic induction
Data Source
AI summary
A wireless power transfer system includes a wireless power transfer device. The wireless power transfer device includes a first transmitting coil oriented along a first axis; a second transmitting coil on the first transmitting coil and oriented along a second axis different from the first axis; and a nonmagnetic material magnetically decoupling the first transmitting coil from the second transmitting coil in an area of overlap between the first and second transmitting coils.