Inductive Sensor Coupling Overlap for Error and Signal Balance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing inductive sensor arrangements suffer from measurement errors and low signal amplitudes, which affect their accuracy and require larger installation spaces and more expensive amplifiers, while also compromising electromagnetic compatibility.
Innovation Solution
The inductive sensor arrangement optimizes the overlap ratio between the conductive coupling segment and the receiver structure to achieve a balance between measurement error and signal amplitude, using an overlap ratio of 0.7 to 0.8 to enhance signal amplitude and reduce measurement error, thereby allowing for smaller installation spaces and cost-effective semiconductor amplifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the overlap ratio between the conductive coupling segment and the receiver structure is increased, then the signal amplitude is improved, but the measurement error increases
Solution Approach 1:
The patent applies parameter changes by optimizing the overlap ratio to a specific range (0.6 to 0.8, preferably 0.7 to 0.75) rather than using extreme values. This intermediate parameter selection balances the conflicting requirements of measurement precision and signal amplitude, resolving the technical contradiction through quantitative parameter optimization.
2Measurement precision
If the signal amplitude is increased to improve measurement precision, then the installation space increases and amplifier costs increase
Solution Approach 1:
The patent changes the parameter of overlap ratio to an optimized range (0.6 to 0.8) which naturally increases signal amplitude without requiring proportional increases in installation space. This parameter optimization allows achieving better measurement precision while controlling the growth of installation space and amplifier requirements.
3Measurement precision
If the signal amplitude is increased to reduce measurement error, then the EMC robustness deteriorates
Solution Approach 1:
The patent applies parameter changes by selecting an intermediate overlap ratio range (0.6 to 0.8) that balances measurement precision and EMC robustness. This moderate parameter selection avoids the extremes that would cause either high measurement error or poor electromagnetic compatibility, resolving the contradiction between these two requirements.
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 reduces measurement errors, increases signal amplitude, improves signal-to-noise ratio, enhances EMC robustness, and allows for larger air gaps, resulting in cost savings and more compact designs.
Implementation Method 1
A high frequency current passes through the at least one exciter coil generating an alternating magnetic field, which induces eddy currents in the at least one coupling device
Implementation Method 2
The inductive coupling of the at least one exciter coil and the at least one receiving coil depends on the position of the corresponding coupling device. The induced voltage signal in the at least one receiver coil can be used to infer the current position of the coupling device
Data Source
AI summary
An inductive sensor arrangement for detecting a movement of a movable body is disclosed. The inductive sensor arrangement has a measured value acquisition device which includes an exciter structure and a receiver structure, and a coupling device. An evaluation and control unit is designed to couple a periodic alternating signal into the exciter structure during operation and to evaluate signals induced in the receiver structure and to determine a measurement signal. The coupling device has a base body with at least one electrically conductive coupling segment and is designed to influence an inductive coupling between the exciter structure and the receiver structure. An overlap ratio, which is calculated from an overlap dimension of the electrically conductive coupling segment in the direction of movement with respect to a periodic section of the receiver structure, is selected as a function of a resulting measurement error and a resulting amplitude of the measurement signal such that the resulting measurement error of the measurement signal falls below a predetermined first threshold value which is present at a coverage ratio of 0.5, and the resulting amplitude exceeds a predetermined design-dependent second threshold value.