Linear Position Sensor Gain Offset Calibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current linear position sensor systems are only accurate within a limited range due to factors like ambient temperature, geometry, air gap, magnet material, and magnetization angle, which affect their ability to detect magnet position beyond zero crossings.
Innovation Solution
Implementing a linear position sensor system utilizing three-dimensional/two-dimensional Hall technology, with a controller that adjusts magnetic flux measurements by calculating offsets and gains based on reference values to accurately detect magnet position at extended stroke lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the magnet stroke length is extended beyond the traditional zero crossing area, then the operational range of the position sensor is improved, but the measurement precision deteriorates due to increased impact from temperature, geometry, air gap, magnet material, and magnetization angle factors
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the gain and offset parameters of the position sensor based on the detected magnetic flux values. The controller modifies these parameters in real-time to compensate for variations caused by extended stroke lengths, temperature changes, air gap variations, and magnetization angle deviations, thereby maintaining measurement precision across the extended operational range
Solution Approach 2:
The patent implements feedback by continuously monitoring the magnetic flux values detected by the position sensor and using this information to adjust the gain and offset parameters. The controller compares the detected flux against reference values and dynamically modifies the sensor parameters to maintain accuracy, creating a closed-loop system that compensates for errors introduced by extended stroke lengths and environmental factors
2Adaptability or versatility
If environmental factors such as ambient temperature and air gap variations are present, then the adaptability of the system to different operating conditions is improved, but the measurement precision deteriorates due to increased errors in position detection
Solution Approach 1:
The patent compensates for environmental factors by dynamically changing the gain and offset parameters based on detected magnetic flux variations. When temperature or air gap conditions change, the magnetic flux signal changes accordingly, and the controller adjusts the parameters to maintain accurate position detection despite these environmental variations
Solution Approach 2:
The patent converts the harmful effect of environmental variations into a beneficial signal by using the changes in magnetic flux caused by temperature and air gap variations as the basis for parameter adjustment. The system detects these variations through the flux signal and uses them to automatically compensate for the errors they introduce, turning the harmful environmental influence into useful feedback information
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
Enables accurate detection of magnet position beyond traditional zero crossings, improving the system's operational range and reducing errors caused by environmental and design-related factors.
Implementation Method 1
the position sensor may measure a magnetic flux produced by the magnet and produce an electrical signal that varies as the position of the magnet varies
Implementation Method 2
linear position sensor systems utilizing three-dimensional/two-dimensional hall technology
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A position sensor measures a magnetic flux of a magnetic field produced by a magnet system in a first direction and a second direction. Values associated with the measured magnetic flux in the first direction are adjusted based on a first gain and a first offset that are determined based on the measured magnetic flux and a reference magnetic flux in the first direction. Values associated with the measured magnetic flux in the second direction are adjusted based on a second gain and a second offset that are determined based on the measured magnetic flux and a reference magnetic flux in the second direction. A position of the magnet system with respect to the position sensor at a given time may then be determined based on the adjusted values of the magnetic flux in the first and second directions at the given time.