Magnetic Shielding Frame With Interruption Gap
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Solution Overview
Problem
Conventional magnetic field shielding methods are inadequate for effectively shielding sensor devices from strong magnetic interference fields generated by high-current conductors, particularly in applications like railway technology where closed magnetic field lines pose significant interference.
Innovation Solution
A shielding device comprising a magnetically conductive frame or hollow body with an interruption gap that distorts and shifts the magnetic field, combined with additional shielding elements like plates and pot-shaped components, to create a spatial area with minimized magnetic field strength for sensor placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a complete shielding element surrounds the conductor, then the magnetic field is contained within the shielding element, but the sensor cannot detect the useful magnetic field and the shielding effect is inadequate
Solution Approach 1:
The shielding element is designed with an interruption gap that segments the otherwise continuous shielding structure. This segmentation allows the magnetic field to be partially contained while permitting the sensor to detect the useful magnetic field through the gap, thereby resolving the contradiction between shielding effectiveness and sensor detection capability
Solution Approach 2:
The shielding element provides different magnetic field management characteristics in different spatial regions: the majority of the structure contains and shields the magnetic field, while the interruption gap region allows magnetic field penetration for sensor detection. This local differentiation of shielding quality enables simultaneous achievement of field containment and sensor functionality
2Measurement precision
If no shielding element is used, then the sensor can detect magnetic fields freely, but the sensor is strongly influenced by interfering magnetic fields from high-current conductors
Solution Approach 1:
The interruption gap in the shielding element creates a controlled opening that allows the sensor to access the magnetic field while the remaining segmented structure provides interference shielding, enabling the sensor to detect useful fields while rejecting interfering fields from high-current conductors
3Object-affected harmful factors
If a conventional frame shielding element is used, then the structure provides some shielding, but closed magnetic field lines form around the conductor causing strong interference
Solution Approach 1:
By introducing an interruption gap that segments the shielding element, the design prevents the formation of closed magnetic field lines around the conductor. The gap breaks the continuous magnetic path, causing field lines to emerge and redirect, thereby significantly reducing magnetic interference and improving shielding effectiveness
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 significantly weakens the magnetic interference field, allowing for effective shielding of sensor devices and reducing magnetic disruptions, while allowing the sensor to detect useful magnetic fields without complete shielding.
Implementation Method 1
a shielding element (4) designed as a frame or hollow body made of a magnetically conductive material, which surrounds the electrical conductor (3) at least over part of the length, in particular over the entire length, in a plane perpendicular to the direction of current flow except for an interruption gap (5) in order to distort and/or shift the interference field
Implementation Method 2
shielding element (4) designed as a frame or hollow body made of a magnetically conductive material
Data Source
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AI summary
Proposed is an electrical assembly comprising a sensor device, at least one electrical conductor, and a shielding device for shielding the sensor device or sensor head from the magnetic field generated by the electric current flowing through the at least one electrical conductor. To improve the shielding, the shielding device includes a shielding element, designed as a frame and/or hollow body, made of a magnetically conductive material. This shielding element surrounds the at least one electrical conductor, at least over a portion of its length, in a plane nearly perpendicular to the current flow direction, except for a gap, in order to distort and/or shift the interfering field.