Sensor Target Shaft Geometry for Precise Magnetic Position Detection
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Solution Overview
Problem
Existing position detection systems using a sensor shaft with a constant cross-section for magnetic field changes provide insufficiently precise results.
Innovation Solution
A sensor target shaft with a target carrier and target portion, where the target length is less than the detection length, and the target has a higher influence per length unit on the magnetic field, allowing for improved resolution by restricting the target to a distinct region within the detection length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor shaft with constant cross-section is used for position detection, then the structure is simple and easy to manufacture, but the position detection precision is insufficient
Solution Approach 1:
The sensor shaft is divided into two distinct segments: a target carrier with constant cross-section and a target with different cross-section. This segmentation allows each part to serve its specific function - the target carrier provides structural support while the target creates the magnetic field changes necessary for precise detection, thereby resolving the contradiction between structural simplicity and detection precision.
Solution Approach 2:
The target portion is designed with different cross-sectional characteristics compared to the target carrier, creating local quality variation. This local differentiation ensures that only the target portion significantly influences the magnetic field, improving position detection precision while maintaining overall structural simplicity through the constant cross-section target carrier.
2Measurement precision
If the target length is made equal to the detection length, then the detection coverage is maximized, but the detection precision decreases due to reduced magnetic field influence concentration
Solution Approach 1:
The target is extracted as a separate component with length less than the detection length, positioned within the detection region. This extraction allows the target to concentrate its magnetic field influence over a shorter, more defined length, improving detection precision while the target carrier ensures the target remains within the detection zone throughout the measurement range.
Solution Approach 2:
The system dynamically positions the target within the detection region through the movable target carrier. As the target carrier moves the target along the detection length, the magnetic field influence dynamically concentrates at the target's current position, maintaining high detection precision across the entire detection range despite the target's length being less than the detection length.
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
Enhances the accuracy of position detection by ensuring the magnetic field change is mainly influenced by the target, reducing uncertainties and improving detection precision.
Implementation Method 1
sensor for position detection of the target based on changes in a magnetic field in response to a movement of the sensor target shaft
Data Source
Figure 1~3B
AI summary
The present invention relates to a sensor target shaft (1) comprising a target (10) for position detection of the target (10) by a sensor (25) comprised by a sensor unit (2) based on changes in a magnetic field, wherein the sensor target shaft (1) longitudinally extends along a longitudinal axis (X1) and is configured to be translationally movable in the direction of the longitudinal axis (X1) between a first position and a second position defining a detection length (DL22), wherein the sensor target shaft (1) comprises a target carrier (11) extending along the longitudinal axis (X1) comprising or being attached to the target (10), wherein the length (L10) of the target (10) in the longitudinal direction (X1) is less than the detection length (DL22), and wherein an influence per length unit of the target (10) on a magnetic field is more than an influence per length unit of the target carrier (11) on the magnetic field.