Inductive Scanning Element Shielding Layer Structure
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Solution Overview
Problem
Inductive position measuring devices face challenges in achieving precise measurements while minimizing signal attenuation and interference, particularly due to shielding layers that can negatively impact measurement accuracy.
Innovation Solution
A scanning element with a substrate made of metallic material, incorporating a shielding layer structure comprising a dielectric first layer and an electrically conductive second layer, arranged between the substrate and the exciter or receiver tracks, which also includes an insulating layer and additional conductive layers for effective shielding without significant signal attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shielding layer structure is added to reduce interference, then shielding effectiveness is improved, but signal attenuation increases
Solution Approach 1:
The shielding layer structure is selectively positioned between the substrate and specific tracks (excitation or receiver tracks) rather than uniformly across the entire substrate. This localized shielding approach provides interference protection precisely where needed while minimizing the overall impact on signal transmission paths.
Solution Approach 2:
A dielectric layer is introduced as an intermediary between the conductive shielding layer and the substrate/tracks. This dielectric mediator reduces the direct interaction between the conductive shielding layer and the electromagnetic fields, thereby decreasing signal attenuation while maintaining the shielding effect against interference.
2Strength
If a metallic substrate is used to improve structural stability, then mechanical strength is improved, but signal interference increases
Solution Approach 1:
The dielectric layer serves as a mediator between the metallic substrate and the conductive shielding layer, preventing direct electromagnetic coupling that would cause interference. This allows the metallic substrate to maintain its structural advantages while the dielectric barrier eliminates its harmful electromagnetic effects.
Solution Approach 2:
The shielding function is segmented into a separate conductive layer distinct from the substrate, allowing the substrate to fulfill its structural role without interference, while the dedicated shielding layer handles electromagnetic protection in conjunction with the dielectric layer.
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 solution enables precise position determination with reduced interference, allowing for high-quality position signals to be received, while maintaining the strength required for accurate measurement, thus improving the overall performance of inductive position measuring devices.
Implementation Method 1
a shielding layer structure (1.2) comprising at least a dielectric first layer (1.21) and an electrically conductive second layer (1.22), which is arranged between the substrate (1.3) and the at least one receiver track (Ra, Ri)
Implementation Method 2
When a temporally varying electrical excitation current is applied to the excitation conductor tracks of the excitation track, signals dependent on the angular position are generated in the receiver conductor tracks of the receiver track during the relative rotation between the rotor and stator
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a scanning element (1) for an inductive position measuring device, comprising an excitation track (Sa, Si) and a receiver track (Ri, Ra), a substrate (1.3) made of a metallic material, and a shielding layer structure (1.2). This shielding layer structure comprises a first layer (1.21) that has dielectric properties and a second layer (1.22) that is electrically conductive. The shielding layer structure (1.2) is arranged between the substrate (1.3) and the receiver track (Ri, Ra) and/or between the substrate (1.3) and the excitation track (Sa, Si).