Coil Unit Magnetic Flux Shielding for Adjacent Coil Interference
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Solution Overview
Problem
In contactless power supply systems for traveling vehicles, electromagnetic coupling between coils leads to power loss and impedance interference, as induced currents flow in adjacent coils, causing inefficiencies in electric power transmission.
Innovation Solution
A coil unit with a magnetic flux reduction structure, comprising a first and second coil arranged adjacent to each other, where the magnetic flux generated by the first coil is reduced to prevent induced voltage or current in the second coil, thereby minimizing power leakage and impedance interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple coils are arranged adjacent to each other for contactless power supply, then the power supply coverage is improved, but electromagnetic coupling between adjacent coils causes power loss and impedance interference
Solution Approach 1:
A magnetic flux reduction structure is introduced as an intermediary element between adjacent coils. This structure selectively reduces magnetic flux in the region between coils, preventing electromagnetic coupling and induced current flow in adjacent coils, thereby reducing power loss while maintaining the power supply coverage provided by multiple adjacent coils
Solution Approach 2:
The harmful magnetic flux that causes electromagnetic coupling between adjacent coils is extracted or removed from the system by introducing the magnetic flux reduction structure. This structure specifically targets and reduces the flux that would otherwise cause induced current in adjacent coils, separating the useful flux (for power transfer) from the harmful flux (causing coupling)
2Area of stationary object
If multiple coils are arranged adjacent to each other for contactless power supply, then the power supply coverage is improved, but impedance interference between adjacent coils occurs
Solution Approach 1:
The magnetic flux reduction structure serves as a mediator that prevents direct electromagnetic interaction between adjacent coils. By reducing magnetic flux in the inter-coil region, it eliminates the impedance interference that would otherwise occur between adjacent coils while allowing each coil to maintain its power supply coverage area
Solution Approach 2:
The magnetic flux distribution is segmented into useful regions (within each coil for power transfer) and harmful regions (between coils causing interference). The magnetic flux reduction structure specifically targets the harmful regions, creating a segmented flux pattern that maintains coverage while eliminating interference
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 suppresses power loss and impedance interference, ensuring efficient electric power transfer to the intended coil while preventing electromagnetic coupling, thus enhancing the overall efficiency of the contactless power supply system.
Implementation Method 1
magnetic flux by which the first coil causes an induced voltage or induced current to be generated in the second coil
Data Source
AI summary
A coil unit for a contactless power supply system includes a plurality of coils for electric power transfer, and a magnetic flux reduction structure. The plurality of coils include a first coil and a second coil adjacent to the first coil in a predetermined direction. The magnetic flux reduction structure reduces, during electric power transfer using the first coil, magnetic flux by which the first coil causes an induced voltage or induced current to be generated in the second coil.