Multi-Plane Receiving Coil Layout for Low-Interference Inductive Sensing
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Solution Overview
Problem
Inductive sensor arrangements face challenges in reducing angular errors and interference from external fields while maintaining signal amplitude, particularly in applications with limited installation space.
Innovation Solution
The proposed measured value acquisition device features a circuit carrier with receiving coils having windings connected in series, where loop structures in different planes are offset and connected via connecting elements with opposite passage directions, forming a differential construction to minimize interference and allow for a series connection of windings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If windings are connected in series to increase signal amplitude, then measurement precision is improved, but device complexity increases due to the need for offset arrangement and connecting structures
Solution Approach 1:
The patent transitions from planar winding arrangement to three-dimensional offset arrangement across multiple planes. Loop structures are distributed in at least two different planes along the movement path, with connecting elements bridging between planes. This spatial dimensionality change enables series connection of windings while maintaining compact footprint and reducing angular errors through geometric offset.
Solution Approach 2:
The receiving coil is segmented into multiple windings with periodically repeating loop portions, where each loop structure can be independently arranged in different planes. The loop portions are separated at specific points and connected via connecting elements, allowing flexible series connection while maintaining signal coherence and enabling differential interference cancellation.
2Measurement precision
If loop structures are arranged in multiple planes with offset positions, then angular error is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent converts the potential harm of manufacturing tolerances into a beneficial differential configuration. By arranging loop structures in multiple planes with opposite passage directions and offset positions, any positional deviations or interference fields from one plane are counterbalanced by the opposing configuration in another plane, transforming manufacturing imperfections into interference-canceling differential pairs.
Solution Approach 2:
The patent employs asymmetric offset arrangement of loop structures across different planes, where corresponding loop portions are deliberately positioned at different locations and orientations. This asymmetric configuration, combined with opposite passage directions, creates differential sensitivity to angular position while providing inherent rejection of symmetric interference and manufacturing errors.
3Reliability
If connecting elements with opposite passage directions are used to cancel interference fields, then reliability is improved, but device complexity increases due to additional connecting structures
Solution Approach 1:
The patent merges the functions of series connection and interference cancellation into a single integrated configuration. The connecting elements that electrically series-connect the windings also serve as the differential arms with opposite passage directions that cancel interference fields. This merging eliminates the need for separate interference cancellation structures, reducing overall device complexity while maintaining reliability.
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 design reduces interference and maintains signal amplitude by canceling out interference fields, enabling precise measurement of rotational or linear movements with reduced installation space requirements.
Implementation Method 1
A high frequency current passes through the at least one exciter coil generating an alternating magnetic field, which induces eddy currents in the at least one coupling device. By the induced voltage signal in the at least one receiving coil, the electrical angle of rotation of the coupling device and the current angle of rotation of the shaft or the rotor can be closed.
Implementation Method 2
The at least one connecting structure comprises at least two connecting elements, which are arranged in at least two parallel planes and have opposite directions of passage. The arrangement of the at least two connecting elements results in a differential construction of the at least one connecting structure. The advantage of such a differential construction is that it is not prone to interference fields.
Data Source
AI summary
A measured value acquisition device includes a circuit carrier, which comprises a receiving structure, which comprises a receiving coil having at least two electrically connected windings in series. A single winding comprises two loop structures having periodically repeating loop portions and is formed in at least two planes of the circuit carrier. Portions of the individual loop structures are electrically connected to each other via through-contacts. Loop portions of the individual windings have opposite directions of passage. The loop structures are arranged in a direction of the movement path offset from one another by a predetermined distance. The individual loop structures are separated at a separation point and are connected to each other via a connecting structure to be in series. The connecting structure comprises at least two connecting elements arranged in at least two parallel planes and have opposite directions of passage.