Sensor Coil Optimization for Position Determination Accuracy
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Solution Overview
Problem
Position sensors, particularly inductive position sensors, face inaccuracies due to non-uniform electromagnetic fields, wire trace connections, air-gap variations, and mismatches between receiver coils, leading to inaccurate position determination.
Innovation Solution
A computer-implemented method for optimizing position sensor coil design involves simulating coil performance, comparing it to specifications, and iteratively modifying the design to achieve improved accuracy, using algorithms to adjust coil layouts and account for non-idealities such as air-gap and coupling effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional coil designs are used, then device complexity is low, but measurement precision deteriorates due to non-uniform electromagnetic fields and coil mismatches
Solution Approach 1:
The patent applies preliminary action by performing simulation-based optimization of coil designs before manufacturing. Multiple coil configurations are simulated in advance to predict and correct non-uniform field effects, air-gap variations, and coil mismatches, allowing the selection of optimized designs that achieve high measurement precision without requiring complex post-manufacturing adjustments or calibration procedures
Solution Approach 2:
The patent employs parameter changes by systematically varying coil geometric parameters (such as trace width, spacing, winding patterns, and dimensional proportions) in simulations to identify configurations that minimize measurement errors. This includes adjusting parameters to compensate for non-uniform electromagnetic fields and reduce sensitivity to air-gap variations, thereby improving position determination accuracy through optimized physical dimensions
2Measurement precision
If iterative simulation and modification of coil designs is performed, then measurement precision improves, but loss of time increases due to multiple simulation iterations
Solution Approach 1:
The patent resolves this contradiction by performing comprehensive simulation and optimization in the preliminary design phase, before manufacturing. By anticipating and correcting potential measurement errors through advance simulation of various coil configurations, the need for time-consuming post-manufacturing calibration and linearization is eliminated, actually reducing total development time despite multiple simulation iterations
Solution Approach 2:
The patent uses virtual copying by creating detailed simulation models that replicate the electromagnetic behavior of physical coil designs. These digital twins allow for rapid iteration and comparison of multiple coil configurations without requiring physical prototypes, enabling thorough optimization while minimizing the time and material resources needed for physical testing and adjustment
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 significantly reduces position determination errors, achieving accuracy within 0.5% of full scale, a six-fold improvement over traditional methods, and eliminates the need for linearization or calibration, thereby shortening product development time.
Implementation Method 1
a transmit coil is used to induce eddy currents in a metallic target that is sliding or rotating above a set of receiver coils. Receiver coils receive the magnetic field generated from eddy currents and the transmit coils
Implementation Method 2
a transmit coil is used to induce eddy currents in a metallic target that is sliding or rotating above a set of receiver coils. Receiver coils receive the magnetic field generated from eddy currents
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 2C~2D
AI summary
In some embodiments, a coil design system is provided. In particular, a method of providing an optimized position locating sensor coil design in presented. The method includes receiving a coil design; simulating position determination with the coil design to form a simulated performance; comparing the simulated response with the specification to provide a comparison; and modifying the coil design based on a comparison between the simulated performance and a performance specification to arrive at an updated coil design.