Rotating Wireless Power Feeder Coil with Non-Uniform Magnetic Field
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Solution Overview
Problem
Current wireless power feeding technologies, particularly the magnetic field resonance type, lack a simple mechanism for controlling the magnitude of power transmission and direction, often resulting in complex system configurations.
Innovation Solution
A wireless power feeder and receiver system utilizing a rotatable feeding coil and receiving coil with non-uniform magnetic characteristics, achieved by installing magnetic bodies at specific parts of the coil circumference, allowing for adjustment of magnetic field distribution and mutual inductance between coils to control power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If variable capacitors or variable inductors are used to control power feeding or power receiving, then power control is achieved, but the system configuration becomes complicated
Solution Approach 1:
The invention extracts and eliminates the variable capacitors and variable inductors from the system. Instead of using these complex components for power control, the patent achieves power control through the rotating coil structure itself, which naturally varies the coupling coefficient k as it rotates. This removes the need for additional control components while maintaining power control capability.
Solution Approach 2:
The invention replaces the electrical control mechanism (variable capacitors/inductors) with a mechanical rotation mechanism. By rotating the coil assembly, the coupling coefficient between coils changes mechanically, achieving power control without electrical components. The rotation angle directly controls the power transmission magnitude.
2Loss of energy
If magnetic field resonance type wireless power feeding is used, then high power transmission efficiency is achieved in intermediate range, but control of power magnitude and direction becomes difficult
Solution Approach 1:
The invention introduces dynamic control capability to the magnetic field resonance system. The coil assembly can rotate to change its orientation relative to the receiving coil, dynamically adjusting the coupling coefficient k. This allows real-time control of power transmission magnitude and direction while maintaining the high efficiency benefits of magnetic field resonance.
Solution Approach 2:
The invention changes the coupling coefficient k as a controllable parameter by rotating the coil assembly. As the rotation angle changes, the coupling coefficient varies, providing a direct method to control power transmission magnitude. This parameter change approach maintains energy efficiency while enabling flexible control.
3Length of moving object
If four coils are used for magnetic field resonance power transmission, then power can be fed wirelessly in intermediate range, but the system structure becomes complex
Solution Approach 1:
The invention merges the exciting coil and feeding coil into a single integrated rotating coil assembly. Similarly, the receiving coil and loading coil are merged. This reduces the system from four separate coils to two integrated assemblies, simplifying the overall structure while maintaining the magnetic field resonance power transmission capability over intermediate distances.
Solution Approach 2:
The rotating coil assembly serves multiple functions: it acts as both the exciting coil and feeding coil, and through rotation, it can control both power magnitude and direction. This multi-functionality reduces the number of components needed while achieving the same power transmission objectives.
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 flexible control of power transmission magnitude and direction with a simplified configuration, maintaining high power transmission efficiency even with changes in coil distance and orientation.
Implementation Method 1
a wireless power feeding technique... type (C) utilizing resonance phenomenon of magnetic field (for intermediate range)
Implementation Method 2
The type (A) utilizing electromagnetic induction has generally been employed in familiar home appliances
Implementation Method 3
A wireless power feeder and receiver system utilizing a rotatable feeding coil and receiving coil with non-uniform magnetic characteristics, achieved by installing magnetic bodies at specific parts of the coil circumference
Implementation Method 4
allowing for adjustment of magnetic field distribution and mutual inductance between coils to control power transmission
Data Source
AI summary
A wireless power feeder feeds power from a feeding coil to a receiving coil by wireless using a magnetic field resonance phenomenon. The feeding coil is constructed in a rotatable manner. A power transmission control circuit that supplies AC power to the feeding coil so as to make the feeding coil feed the AC power to the receiving coil. The feeding coil is constructed such that the magnetic characteristics thereof in the circumferential direction are made non-uniform. Concretely, a magnetic body is installed at only a part of the circumference of the feeding coil to make the magnetic characteristics of the feeding coil in the circumferential direction non-uniform.