Position Measuring Device Permanent Magnet Premagnetization
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Solution Overview
Problem
Existing position measuring devices using three pre-magnetization elements are costly due to high material and assembly costs, while maintaining the need for high measurement accuracy and economic production.
Innovation Solution
A position measuring device is designed with a detection element and a movable scale element, featuring three division lanes - two absolutely trained and one incremental - with sensor fields arranged perpendicular to the division lanes to minimize air gaps and optimize magnetic field interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If three pre-magnetization elements are used in the position measuring device, then measurement accuracy is maintained, but material costs and assembly costs increase
Solution Approach 1:
The patent combines the functions of three separate pre-magnetization elements into a single permanent magnet. This permanent magnet is positioned to simultaneously pre-magnetize all three sensor fields (first, second, and third sensor fields) that read from three graduation tracks. By merging multiple magnetization sources into one, the patent reduces material costs and assembly complexity while maintaining the necessary magnetic field configuration for accurate position measurement across all tracks.
2Reliability
If sensor fields are arranged close to graduation tracks to minimize air gaps, then magnetic field interaction is optimized, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies preliminary magnetization to the sensor fields using a permanent magnet positioned behind the substrate. This pre-magnetization occurs before the sensor fields are positioned relative to the graduation tracks, ensuring that the magnetic domains in the sensor fields are already aligned. This preliminary action reduces sensitivity to variations in air gap distance, allowing for more relaxed manufacturing tolerances while maintaining reliable magnetic field interaction between the sensor fields and graduation tracks.
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 device achieves high measurement accuracy by minimizing interpolation and reverse errors, while reducing costs through simplified design and material usage, effectively combining economic production with precise positioning measurements.
Implementation Method 1
the magnetically sensitive sensor fields are designed and arranged such that at least the magnetically designed graduation track opposite the respective sensor field in the third direction (z) can be scanned
Implementation Method 2
Magnetoresistive sensors enable the determination of position information
Data Source
Figure 1~2
Figure 3~4b
Figure 5~6
AI summary
The invention relates to a position measuring device comprising a detection element (2) and a scale element (1). The scale element (1) comprises a first graduation track (1.1), a second graduation track (1.2), and a third graduation track (1.3). The three graduation tracks (1.1, 1.2, 1.3) are arranged parallel to each other. The detection element (2) comprises a first sensor field (2.1) opposite the first graduation track (1.1), a second sensor field (2.2) opposite the second graduation track (1.2), and a third sensor field (2.3) opposite the third graduation track (1.3). The sensor fields (2.1, 2.2, 2.3) are configured to scan the graduation tracks (1.1, 1.2, 1.3). Additionally, the detection element (2) comprises a first permanent magnet (2.10) and a second permanent magnet (2.20), which cause premagnetization in the sensor fields (2.1, 2.2, 2.3) by forming a magnetic field B.