Inductive Vehicle Charging Shield and Magnetic Core
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Solution Overview
Problem
Existing systems for transferring electric energy to vehicles, such as road automobiles and track-bound vehicles, face challenges in reducing electromagnetic field intensities below the conductor arrangement while maintaining efficiency and minimizing the use of expensive ferromagnetic materials.
Innovation Solution
A combination of an electrically conductive shield and a magnetic core is used to shield the magnetic field produced by the conductor arrangement, with the shield reducing field intensities and the magnetic core compensating to maintain resonance frequency alignment between the primary and secondary conductor arrangements, thereby reducing the need for extensive ferromagnetic material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an electrically conductive shield is added below the conductor arrangement to reduce electromagnetic field intensities, then electromagnetic field intensities below the conductor arrangement are reduced, but energy transfer efficiency deteriorates
Solution Approach 1:
A magnetic core made of ferromagnetic material is introduced as an intermediary element between the electrically conductive shield and the primary conductor arrangement. This magnetic core acts as a mediator that guides and concentrates magnetic flux, compensating for the flux redirection caused by the shield. The magnetic core enables the shield to reduce electromagnetic field intensities below the conductor arrangement while maintaining adequate magnetic coupling and energy transfer efficiency to the vehicle.
2Loss of energy
If extensive ferromagnetic material is used to maintain magnetic coupling, then energy transfer efficiency is maintained, but cost increases
Solution Approach 1:
Instead of using extensive ferromagnetic material throughout the entire conductor arrangement, the invention applies ferromagnetic material locally in the form of a magnetic core positioned specifically below the primary conductor arrangement and above the electrically conductive shield. This localized application of ferromagnetic material provides the necessary magnetic flux concentration and guidance only where needed, reducing the total quantity of ferromagnetic material required while maintaining energy transfer efficiency.
3Object-affected harmful factors
If the shield redirects magnetic flux, then electromagnetic field intensities below the conductor arrangement are reduced, but magnetic coupling between primary and secondary arrangements is weakened
Solution Approach 1:
The magnetic core serves as a mediator that bridges the gap between the shield's flux-redirection effect and the need for strong magnetic coupling. By positioning the ferromagnetic core between the primary conductor arrangement and the shield, it provides a preferred path for magnetic flux, ensuring adequate coupling to the secondary arrangement on the vehicle while the shield continues to redirect flux away from areas below the conductor arrangement.
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 intensities below the conductor arrangement without significantly deteriorating energy transfer efficiency, while minimizing the use of costly ferromagnetic materials, ensuring efficient energy transfer to vehicles.
Implementation Method 1
the system comprises an electrically conductive shield for shielding the magnetic field
Implementation Method 2
A route side (primary side) conductor arrangement produces a magnetic field, which is in particular a component of an alternating electromagnetic field. The field is received by a coil (secondary side) on board of the vehicle so that the field produces an electric voltage by induction
Data Source
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AI summary
The invention relates to a system for transferring electric energy to a vehicle, in particular to a road automobile or to a track bound vehicle such as a light rail vehicle, wherein the system comprises an electric conductor arrangement (37) for producing a magnetic field and for thereby transferring the energy to the vehicle, wherein the electric conductor arrangement (37) comprises at least one current line (37a, 37b, 37c), wherein each current line (37a, 37b, 37c) is adapted to carry the electric current which produces the magnetic field or is adapted to carry one of parallel electric currents which produce the magnetic field and wherein: - the current line or lines (37a, 37b, 37c) extend(s) at a first height level, - the system comprises an electrically conductive shield (20) for shielding the magnetic field, wherein the shield (20) extends under the track and extends below the first height level, and - a magnetic core (39) extends along the track at a second height level and extends above the shield (20).