Magnetic Sensor Hysteresis Correction for Distance Measurement
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Solution Overview
Problem
Magnetic sensors experience positional instability during reciprocating movement due to hysteresis characteristics, leading to increased errors in distance measurement, particularly in the post-turnaround region.
Innovation Solution
A magnetic sensor system comprising a magnetic sensor, a magnetic scale, a transformer, and a controller, where the transformer includes a hysteresis corrector that adjusts output signals based on moving direction information to stabilize positional data by applying hysteresis corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If hysteresis correction is applied to the post-turnaround region based on operating direction, then measurement accuracy is improved, but positional stability deteriorates due to error increase in the transitional region
Solution Approach 1:
The patent applies different hysteresis correction strategies to different regions: the post-turnaround transitional region and the steady-state region. In the transitional region, no hysteresis correction is applied to maintain positional stability, while in the steady-state region, hysteresis correction is applied to improve measurement accuracy. This local differentiation resolves the contradiction by preventing error amplification in the unstable transitional region while still benefiting from correction in stable regions.
Solution Approach 2:
The patent segments the movement region into two distinct zones: a post-turnaround transitional region and a steady-state region. By identifying and separating these regions, the system can apply appropriate correction strategies to each—avoiding correction in the transitional region where it would cause errors, and applying correction in the steady-state region where it improves accuracy.
2Measurement precision
If correction of ±c1/2 is applied to the post-turnaround region, then measurement error is reduced, but positional information becomes unstable
Solution Approach 1:
The patent applies different hysteresis correction strategies to different regions: the post-turnaround transitional region and the steady-state region. In the transitional region, no hysteresis correction is applied to maintain positional stability, while in the steady-state region, hysteresis correction is applied to improve measurement accuracy. This local differentiation resolves the contradiction by preventing error amplification in the unstable transitional region while still benefiting from correction in stable regions.
Solution Approach 2:
The patent identifies the post-turnaround transitional region as a special zone where hysteresis correction should be avoided. By preliminarily recognizing this region's characteristics (immediate post-turnaround area), the system preemptively prevents application of corrective measures that would cause error amplification, thereby maintaining positional stability before entering the steady-state region where correction becomes beneficial.
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 system effectively stabilizes positional information by optimizing error corrections in transitional regions, reducing positional instability and improving accuracy during reciprocating movements.
Implementation Method 1
a magnetic sensor with magnetoresistance elements for detecting a magnetic field from the magnetic scale
Implementation Method 2
The hysteresis corrector transforms the output signal into the moving distance information by making hysteresis correction to the output signal based on the moving direction information
Data Source
AI summary
A magnetic scale is disposed alongside of a magnetic sensor in a first direction and moves relative to the magnetic sensor in a second direction intersecting with the first direction. A moving distance transformer receives an output signal of the magnetic sensor and transforms the output signal into moving distance information. A controller receives the moving distance from the transformer and gives a movement instruction to either the magnetic sensor or the magnetic scale. The moving distance transformer includes a hysteresis corrector. The controller provides the hysteresis corrector with moving direction information about the magnetic sensor. The hysteresis corrector transforms the output signal into the moving distance information by making hysteresis correction to the output signal based on the moving direction information.