Inductive Position Sensor Orthogonal Detection
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Solution Overview
Problem
Inductive position-measuring devices are limited in their ability to determine displacements perpendicular to the actual measuring direction, requiring additional sensors or complex signal processing to detect orthogonal movements.
Innovation Solution
An inductive position-measuring device with a scanning element and a graduation element, featuring three receiver tracks and two graduation tracks with different periods, allows for the detection of relative positions in both the primary and orthogonal directions using a single set of exciter conductors, enabling the determination of absolute positions through vernier principle-based signal evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional inductive position-measuring devices use a single receiver track for measuring position in the first direction, then the device structure is simple, but the ability to detect orthogonal movements is poor
Solution Approach 1:
The patent introduces a third receiver track positioned between the first and second receiver tracks in the orthogonal direction. This additional dimension enables the device to detect movements in both the primary measuring direction (first direction) and the orthogonal direction (second direction), transforming a single-dimensional measurement system into a multi-dimensional one without requiring separate measurement systems.
Solution Approach 2:
The single set of exciter conductors serves multiple functions by generating electromagnetic fields that are detected by all three receiver tracks. The same excitation source enables measurement in both the first direction (using first and second receiver tracks) and the orthogonal second direction (using the third receiver track), eliminating the need for separate excitation systems for different measurement directions.
2Measurement precision
If additional sensors are added to detect orthogonal movements, then the measurement capability improves, but the device complexity increases
Solution Approach 1:
The patent achieves orthogonal position detection using the existing receiver tracks and exciter conductors rather than adding separate sensors. The third receiver track, positioned between the first and second tracks, utilizes the same electromagnetic excitation field to provide measurement capability in the orthogonal direction, thereby achieving multi-directional measurement without increasing the number of independent sensors.
Solution Approach 2:
The patent combines the functions of multiple measurement directions into a single integrated receiver system. By positioning the third receiver track between the first and second tracks and using the same exciter conductors for all tracks, the device merges orthogonal position detection with the existing measurement system, avoiding the need for separate sensor systems.
3Measurement precision
If separate exciter conductors are used for orthogonal position detection, then the detection sensitivity improves, but the manufacturing complexity increases
Solution Approach 1:
The patent eliminates the need for separate exciter conductors for orthogonal position detection by using the same exciter conductors that generate fields for the first direction measurement. The third receiver track detects orthogonal movements by sensing the electromagnetic field modulated by the graduation tracks, achieving sensitive orthogonal detection without requiring additional excitation sources that would complicate manufacturing.
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 enhances the device's ability to detect orthogonal movements with high sensitivity to errors, allowing for greater manufacturing and assembly tolerances and eliminating the need for separate exciter conductors for orthogonal position detection, thus simplifying the measurement process.
Implementation Method 1
The scanning element includes exciter conductors for generating electromagnetic fields
Data Source
AI summary
An inductive position-measuring device includes a scanning element and a graduation element that are movable relative to each other in a first direction. The scanning element includes exciter conductors and three receiver tracks. The first and the second receiver track are disposed at a distance relative to each other, and the third receiver track is located between the first and the second receiver track. The graduation element includes two graduation tracks which are disposed at a distance relative to each other, and which have different graduation periods. Furthermore, electromagnetic fields generated by the exciter conductors are able to be modulated by the graduation tracks, so that a relative position in the first direction is detectable by the first and the second receiver track, while a relative position in a second direction, which is oriented orthogonally with respect to the first direction, is detectable by the third receiver track.