Inductive Position Detector Winding Arrangement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing inductive displacement detectors face challenges with accuracy due to imperfections and non-linearities caused by manufacturing irregularities, capacitive coupling, and cross-talk between windings, making high-accuracy measurements difficult and time-consuming, especially when requiring >1000 correction points along the measurement scale.
Innovation Solution
The design incorporates a configuration with first and second antenna winding arrangements and target winding arrangements that are orthogonally spaced, featuring coarser and finer pitch receive winding loops with opposite polarities, non-overlapping electrical connections, and a shorted turn to prevent energy coupling, along with a conductive or magnetically permeable surface to reduce noise, and an epoxy encapsulant for robustness, enhancing signal-to-noise ratio and measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional single antenna winding arrangement is used, then device complexity is low, but measurement precision deteriorates due to manufacturing irregularities and non-linearities
Solution Approach 1:
The antenna winding arrangement is divided into a first antenna winding arrangement and a second antenna winding arrangement with different pitch characteristics. The first arrangement provides coarse positioning while the second arrangement provides fine positioning, together achieving high measurement precision without requiring excessive complexity in any single component.
Solution Approach 2:
The patent introduces a second antenna winding arrangement with different pitch characteristics (coarser pitch) alongside the first arrangement (finer pitch). This adds a dimensional aspect to the measurement system, allowing coarse and fine measurements to be combined, thereby achieving high accuracy without proportionally increasing device complexity.
2Measurement precision
If multiple antenna winding arrangements with different pitch are used, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The patent merges the functionality of multiple antenna winding arrangements with different pitch characteristics into a unified detector system. The first and second antenna winding arrangements work together with the target winding arrangements to provide both coarse and fine displacement measurements, achieving high accuracy while managing complexity through integrated design.
Solution Approach 2:
The multiple antenna winding arrangements serve different functions within the same system: the first arrangement handles coarse displacement measurement while the second arrangement handles fine displacement measurement. This multi-functionality allows the system to achieve high measurement accuracy across different scales without requiring separate systems for each function.
3Measurement precision
If calibration with many correction points is performed, then measurement accuracy improves, but time consumption increases
Solution Approach 1:
The patent performs preliminary action by designing the winding arrangements with specific pitch relationships and polarity configurations that inherently reduce non-linearities. This preliminary design consideration reduces the need for extensive post-manufacturing calibration, thereby improving measurement linearity while minimizing calibration time.
Solution Approach 2:
The patent changes key parameters of the winding arrangements, specifically the pitch relationships between first and second antenna windings and the polarity configuration of target winding loops. These parameter changes are optimized to minimize measurement non-linearities, reducing the correction points needed during calibration and thereby reducing calibration time while maintaining high accuracy.
4Measurement precision
If electrical connections are placed in overlapping areas, then manufacturing is simpler, but measurement accuracy deteriorates due to noise and interference
Solution Approach 1:
The patent extracts electrical connections from overlapping areas where they would cause interference. By positioning connections in non-overlapping regions, the design eliminates noise and interference sources that would degrade signal quality, thereby improving measurement precision while maintaining ease of manufacture through clear spatial separation.
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 improves measurement accuracy and reduces errors, allowing for high-resolution displacement measurements with reduced noise and improved robustness, enabling precise detection even in hostile environments.
Implementation Method 1
use the principle of mutual inductance whereby one or more transmit windings is energized with an AC signal to generate an AC magnetic field
Implementation Method 2
a passive resonant circuit incorporating at least first and second target winding arrangements in series with a capacitor
Implementation Method 3
receive windings are arranged to couple with the transmit windings. The amount of coupling varies as the displacement of a passive inductive target varies relative to the windings
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An inductive position detector with a first and a second body, at least one of said bodies being displaceable relative to the other along a measurement path wherein said first body comprises one or more antenna windings forming a first arrangement of windings and said second body comprises a passive resonant circuit incorporating one or more target windings in series with a capacitor; said circuit covering at least in part said first arrangement; characterised in that said first body comprises an additional winding arrangement disposed along at least part of said measurement path; said additional winding arrangement being spaced from said first arrangement of windings; and said second body comprises an additional winding arrangement covering at least in part said additional winding arrangement of said first body.