Traveling Power Feed Shielding With Holes for Eddy Current Loss
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Solution Overview
Problem
Existing contactless power feeding systems for traveling vehicles face challenges in reducing external leakage of the electromagnetic field while minimizing losses due to eddy currents, which occur when shielding members are used to prevent field leakage.
Innovation Solution
The system incorporates a coil for power transmission, a power transmission circuit, and a shielding member with holes to reduce electromagnetic field leakage and eddy current losses, where the ratio of the hole diameter to the interval between the coil and the shielding member is optimized to minimize both leak current and eddy current losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a shielding member is used to reduce electromagnetic field leakage, then external leakage is reduced, but eddy current losses increase
Solution Approach 1:
The shielding member is designed with holes (porous structure) to allow electromagnetic fields to pass through while maintaining shielding effectiveness. The holes have a diameter smaller than the wavelength of the electromagnetic field, enabling the shielding member to block eddy currents while permitting field transmission, thus reducing both leakage and energy loss.
Solution Approach 2:
The shielding member has non-uniform structure with holes distributed at specific locations and densities. The local quality varies across the shielding member surface, with hole size and distribution optimized for different regions to achieve effective shielding while minimizing eddy current paths in critical areas.
2Loss of energy
If the hole diameter is increased to reduce eddy current losses, then eddy current losses decrease, but shielding effectiveness is reduced
Solution Approach 1:
The hole diameter is optimized to a specific parameter range that is smaller than the electromagnetic field wavelength but large enough to disrupt eddy current formation. This parameter optimization achieves a balance where the holes are sufficient to break eddy current paths (reducing losses) while remaining small enough to maintain shielding effectiveness against field leakage.
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 effectively reduces electromagnetic field leakage and eddy current losses, allowing for efficient power transmission to traveling vehicles while maintaining a minimal impact on the shielding effect, even when eddy currents are prevented.
Implementation Method 1
at least one shielding member which shields an electromagnetic field of the coil
Implementation Method 2
a coil for power transmission; a power transmission circuit which supplies power to the coil
Data Source
AI summary
A system for power feeding during traveling includes a coil for power transmission, a power supply unit which supplies power to the coils, at least one shielding member which shields an electromagnetic field of the coil, and a hole provided to the shielding members.