Inductive Position Sensor Measurement Range Definition
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Solution Overview
Problem
Inductive position sensors face challenges in achieving a large and precise measurement window for target detection due to difficulties in optimizing the symmetry and compensation of cosine signals, leading to a smaller measurement window with high precision.
Innovation Solution
The method involves adjusting the parameters of the sine signal based on the cosine signal, specifically by setting the period or wavelength of the sine signal to a ratio between 0.79 and 0.93 times that of the cosine signal, and modifying the amplitude and baseline deviation to match the cosine signal, effectively using the cosine signal as a reference for optimal measurement range design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the measurement window is enlarged to increase the detection range, then the measurement range is improved, but the measurement precision deteriorates due to increased dispersion in results
Solution Approach 1:
The patent applies parameter changes by adjusting the period ratio between sine and cosine signals to a specific range (0.79-0.93) and modifying amplitude and baseline parameters. This optimization resolves the contradiction by achieving both a large measurement window (up to 160 electrical degrees) and high measurement precision through carefully tuned signal parameters that minimize dispersion while maximizing detection range
2Measurement precision
If the sine and cosine signals are optimized for symmetry and compensation, then the measurement precision is improved, but the measurement window size is reduced
Solution Approach 1:
The patent inverts the conventional approach by not trying to make sine and cosine signals identical or perfectly symmetric. Instead, it deliberately creates an asymmetric relationship where the sine signal period is intentionally set to 0.79-0.93 times the cosine signal period. This inversion resolves the contradiction by achieving high precision through controlled asymmetry rather than forced symmetry, thereby enabling a larger measurement window
3Measurement precision
If the winding loop dimensions are modified to adjust signal parameters, then the signal amplitude and period are improved, but the device complexity increases
Solution Approach 1:
The patent applies parameter changes by establishing specific mathematical relationships between sine and cosine signal parameters (period ratio of 0.79-0.93, matched amplitudes, aligned baselines). This resolves the contradiction by providing clear design guidelines that achieve high signal parameter accuracy without requiring complex winding configurations, as the relationships can be implemented through systematic parameter adjustment rather than intricate structural design
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 approach results in an enlarged measurement window with higher precision and reduced dispersion in results, improving linearity and reducing variations across the measurement range.
Implementation Method 1
In a known manner, such a primary winding allows a magnetic field to be generated during the flow of current through said primary winding. The magnetic field thus created is perceived by the secondary windings, and induces a voltage in said secondary windings.
Implementation Method 2
the receiver windings 25Sa, 26Ca placed in proximity to said target see an amount of flux of the magnetic field that is lower than if the target were absent
Data Source
AI summary
A method for defining a measurement range, called the useful span, of the inductive position sensor with emission of a cosine and sine signal by at least one first receiver winding and at least one second receiver winding, respectively. The cosine signal emitted by the one or more second receiver windings is taken as reference signal between the two sine and cosine signals for an adjustment of at least one parameter of the sine signal depending on a corresponding parameter of the cosine signal, at least one of the dimension and positioning parameters of the one or more first receiver windings being configured to generate a sine signal having the at least one parameter of the sine signal adjusted with respect to the cosine signal.