Vehicle Resonator Height Equalization for Wireless Power Leakage Control
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Solution Overview
Problem
In wireless power transmission systems, especially for vehicles with a kneeling function, the variation in distances between resonators due to tilting causes differences in coupling coefficients, making it difficult to reduce magnetic field leakage through phase adjustments alone.
Innovation Solution
The arrangement of vehicle resonators in a mobile machine ensures they maintain identical heights relative to the travel surface during tilting, allowing for parallel alignment with ground resonators, which helps in reducing magnetic field leakage by controlling current phases and maintaining consistent coupling coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the vehicle body is tilted during kneeling operation to lower the entrance/exit height, then passenger accessibility is improved, but the distances between resonators on the vehicle body and ground resonators vary, causing differences in coupling coefficients that make it difficult to reduce leakage magnetic field
Solution Approach 1:
The patent applies local quality by arranging resonators at specific portions of the vehicle body where heights relative to the ground are equalized during kneeling operation. This localized arrangement ensures that resonators experience consistent coupling conditions with ground resonators, allowing for effective leakage magnetic field reduction through phase control while maintaining the vehicle's kneeling function for passenger accessibility.
Solution Approach 2:
The patent implements equipotentiality by positioning resonators at locations on the vehicle body that maintain equal heights relative to the ground surface during tilting. This creates equivalent coupling conditions for all resonator pairs, enabling uniform phase adjustment across all resonators to effectively cancel leakage magnetic fields while the vehicle performs kneeling operation.
2Power
If multiple resonators are used for wireless power transmission during kneeling operation, then power transmission capability is improved, but the variation in distances between resonators causes significant differences in currents flowing in individual resonator pairs, making phase adjustment ineffective
Solution Approach 1:
The patent resolves this contradiction by selecting specific locations on the vehicle body for resonator placement where the height relative to ground is equalized during kneeling. This localized arrangement ensures that all resonator pairs experience similar coupling coefficients, allowing for simplified current control where uniform phase adjustment can effectively reduce leakage magnetic fields while maintaining high power transmission capability through multiple resonators.
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 magnetic field leakage by ensuring consistent current flow and phase differences across resonator pairs, even during tilting operations, enhancing power transmission efficiency.
Implementation Method 1
wireless power transmission is performed from a plurality of resonators arranged on the ground side to the resonators of the autobus
Implementation Method 2
a method performs power transmission in a wireless manner between multiple resonators each including a coil
Data Source
AI summary
According to one embodiment, a mobile machine includes a mobile body and a plurality of power transmission resonators. The mobile body is capable of being tilted in a particular direction such that a distance between a particular part opposed to a travel surface and the travel surface is reduced. The plurality of power transmission resonators are arranged at portions of the particular part of the mobile body, heights of the portions with reference to the travel surface being approximately identical with each other in a state of the mobile body being tilted.