Inductive Sensor Receiving Coil Design for Arbitrary Target Shapes
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Solution Overview
Problem
Inductive position sensors face challenges in accurately determining the position of targets with irregular or small shapes, as existing designs often require targets to cover entire loops of receiving coils, leading to unstable voltage waveforms and difficulty in modeling target positions.
Innovation Solution
A method for designing receiving coils based on the shape of the target, where the coils are configured to match the overlapping region with the transmitting coil, allowing the target to cover overlapping loops entirely and generating periodic waveforms for precise position modeling, using a processor to generate models and simulate operations to determine optimal coil geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If targets with irregular or small shapes are used, then adaptability of the sensor is improved, but measurement precision deteriorates due to unstable voltage waveforms
Solution Approach 1:
The receiving coil is designed with non-uniform turn density where more turns are concentrated in regions overlapping with the target. This local quality variation optimizes the magnetic flux coupling for irregular target shapes, generating stable voltage waveforms that enable precise position measurement while maintaining adaptability to various target geometries.
2Manufacturing precision
If receiving coils are designed with fixed loop geometries, then manufacturing precision is improved, but adaptability to arbitrary target shapes deteriorates
Solution Approach 1:
The receiving coil design incorporates variable turn density that dynamically adapts to the target shape through computational modeling during the design phase. The coil geometry is optimized based on the specific target shape requirements, allowing the system to maintain manufacturing precision while achieving adaptability to arbitrary target shapes through parameterized design.
3Measurement precision
If the target covers entire loops of receiving coils, then measurement precision is improved, but the minimum target size increases
Solution Approach 1:
The receiving coil is segmented into multiple turns with varying densities rather than a single uniform loop. This segmentation allows the target to cover only the critical overlapping regions with the transmitting coil, reducing the minimum target size required while maintaining sufficient magnetic flux coupling for precise measurements through the distributed turn structure.
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
Enables the use of receiving coils that can accurately model the position of targets with arbitrary shapes, providing stable and periodic voltage waveforms, and allowing for the use of smaller targets in inductive position sensors.
Implementation Method 1
The magnetic field generated by the transmitting coil can induce eddy currents on the target, and the eddy current can generate a counter magnetic field, changing (e.g., reducing) a magnetic flux density between the target and the pair of receiving coils.
Implementation Method 2
The changes to the magnetic flux density between the target and the pair of receiving coils can generate a voltage at terminals of the pair of receiving coils.
Data Source
AI summary
Systems and methods for designing receiving coils of an inductive position sensor are described. A processor may receive input data indicating a shape of a target of the inductive position sensor. The processor may identify an overlapping region between the target and a transmitting coil of the inductive position sensor. The processor may determine a shape of a receiving coil cell based on the identified overlapping region. The processor may generate a model of the receiving coils of the inductive position sensor based on the shape of the receiving coil cell.