Inductive Vehicle Power Shielding for Emission Control

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Solution Overview

Problem

Inductive power transfer systems for land vehicles face challenges in minimizing electromagnetic radiation emissions to the surroundings while maintaining efficient energy transfer, particularly when the gap between the primary and secondary sides is large.

Innovation Solution

Incorporating a shielding assembly made of magnetizable material around the conductor assemblies on both the primary and secondary sides to redirect magnetic flux lines within the material, thereby reducing electromagnetic field emissions to the surroundings while allowing higher transfer power without exceeding safety limits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the gap between the primary and secondary sides is increased, then the vehicle can move more freely and the system becomes more adaptable, but the electromagnetic field emissions to the surroundings increase and energy transfer efficiency decreases

Engineering Contradiction:

Improvevehicle movement freedomVSAvoidelectromagnetic field emissions

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

A shielding assembly made of magnetizable material is introduced as an intermediary component between the conductor assembly and the surroundings. This shielding assembly redirects magnetic flux lines within the material, acting as a mediator that allows the magnetic field to remain confined to the gap between primary and secondary sides while blocking emissions to the environment, thus enabling larger gaps without increasing harmful emissions

Inventive Principle:

Principle #24Intermediary (Mediator)

2Power

If higher electric currents are used in the conductor assemblies, then the energy transfer power increases, but the magnetic field emissions to the surroundings exceed safety limits

Engineering Contradiction:

Improveenergy transfer powerVSAvoidmagnetic field emissions

Core Design Contradiction:

PowerVSObject-generated harmful factors

Solution Approach 1:

The shielding assembly serves as a mediator that decouples the relationship between current magnitude and environmental emissions. By introducing this intermediate magnetic flux redirecting structure, the system can operate at higher currents for increased power transfer while the shielding assembly confines the magnetic field, preventing emissions from exceeding safety limits

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The magnetizable shielding material converts the potentially harmful stray magnetic field into a beneficial confined flux pattern. The magnetic flux lines that would otherwise radiate harmful emissions are redirected and confined within the shielding assembly, transforming the harmful electromagnetic radiation into a controlled magnetic field that remains within the gap for efficient energy transfer

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 use of magnetizable material effectively shields regions beyond the conductor assemblies from electromagnetic fields, significantly reducing emissions and allowing for higher electric currents to flow through the conductor assemblies without violating magnetic field limits, thus enhancing energy transfer efficiency.

Implementation Method 1

an electromagnetic field is produced on a primary side located on the track of the vehicle and/or located at a stop of the vehicle by a source (typically windings and/or coils of an electric conductor). The magnetic component of the electromagnetic field is received on a secondary side onboard the vehicle above the source of the electromagnetic field. By magnetic induction on the secondary side, the electric energy is produced.

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

Methodology Applied

Scientific EffectMagnetic shielding: Magnetism

Data Source

PatentUS9751415B2Providing a land vehicle, in particular a rail vehicle or a road automobile, with electric energy by induction

Publication Date: 2017.09.05 ENRX IPT GMBH

AI summary

An arrangement for providing a land vehicle, with electric energy includes producing an electromagnetic field on a primary side located on the track of the vehicle and/or located at a stop of the vehicle, by receiving the magnetic component of the electromagnetic field on a secondary side on board the vehicle above the source of the electromagnetic field and by magnetic induction on the secondary side. The arrangement includes a secondary side conductor assembly made of electrically conducting material which produces an electromagnetic stray field during operation while the electrically conducting material carries an alternating electric current and a secondary side shielding assembly made of magnetizable material. The secondary side shielding assembly extends sideways of the secondary side conductor assembly on the same level as the secondary side conductor assembly, thereby shielding regions, which are located beyond the magnetizable material, from the electromagnetic stray field.