Wireless Power Feeding Relay Coil for Lightweight Multicopters
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Solution Overview
Problem
Existing power feeding systems for multicopters increase the weight of the target device due to the need for a power receiving coil, which is undesirable for lightweight or portable applications.
Innovation Solution
A power feeding device and system that uses a relay coil in the power feeding unit to magnetically couple with a power receiving coil on the target, eliminating the need for a magnetic body on the target and allowing for a smaller power receiving coil, thereby reducing the overall weight and maintaining efficient power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power receiving coil is equipped on the power feeding target for wireless power transfer, then power feeding capability is achieved, but the weight of the power feeding target increases
Solution Approach 1:
A relay coil is introduced as an intermediary component in the power feeding unit to mediate the magnetic coupling between the power transmission coil and the power receiving coil. The relay coil receives magnetic flux from the power transmission coil and transmits it to the power receiving coil, enabling wireless power transfer without requiring a magnetic body on the power feeding target. This intermediary approach resolves the contradiction by maintaining power feeding capability while eliminating the need for heavy magnetic coupling components on the moving target.
2Loss of energy
If a magnetic body is added to enhance magnetic coupling between coils, then power transfer efficiency is improved, but the weight and complexity of the power feeding target increases
Solution Approach 1:
The invention inverts the conventional arrangement by placing the relay coil and magnetic body in the stationary power feeding unit rather than on the moving power feeding target. The magnetic body is positioned in the power feeding unit to enhance coupling between the relay coil and power receiving coil, while the power receiving coil itself remains lightweight on the target. This inversion resolves the contradiction by achieving high power transfer efficiency through magnetic enhancement without adding weight to the moving target.
3Device complexity
If direct magnetic coupling is used between power transmission coil and power receiving coil, then system complexity is reduced, but power transfer efficiency decreases without sufficient magnetic coupling
Solution Approach 1:
The relay coil serves as a magnetic intermediary that enhances coupling between the power transmission coil and power receiving coil. By introducing this intermediate magnetic coupling stage with the relay coil and magnetic body in the power feeding unit, the system achieves efficient power transfer without requiring complex direct coupling mechanisms on the target. The relay coil mediates the magnetic flux transmission, improving efficiency while keeping the target-side configuration simple.
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 reduces the weight of the power feeding target by eliminating the need for a magnetic body on the target and enhancing magnetic coupling efficiency, allowing for stronger and more efficient power transfer without increasing the weight of the multicopter.
Implementation Method 1
a power transmission coil provided in the power feeding unit and generating a magnetic field by energization
Implementation Method 2
a relay coil provided in the power feeding unit, receiving the magnetic field generated from the power transmission coil and magnetically coupled to the power transmission coil, and magnetically coupled to a power receiving coil provided in the power feeding target
Implementation Method 3
a magnetic body provided in the power feeding unit and used for magnetic coupling between the relay coil and the power receiving coil
Data Source
AI summary
A power feeding device performing wireless power feeding to a flying object includes: a power feeding unit performing power feeding to the flying object disposed at a power feeding position; a power transmission coil provided in the power feeding unit and generating a magnetic field by energization; a relay coil provided in the power feeding unit, receiving the magnetic field generated from the power transmission coil and magnetically coupled to the power transmission coil, and magnetically coupled to a power receiving coil provided in the flying object in a case where the flying object is positioned at the power feeding position; and a second magnetic body provided in the power feeding unit and used for magnetic coupling between the relay coil and the power receiving coil.