Sensor Coil Optimization for Position Sensing Accuracy
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Solution Overview
Problem
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 in position sensing systems.
Innovation Solution
An optimized coil design method that involves linearizing and offset compensating receiver coils, using geometric correction arrays and shift adjustments to improve coil positioning and signal accuracy, implemented through a simulation and iterative design algorithm to achieve precise position sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional coil design methods are used, then device complexity is reduced, but measurement precision deteriorates due to non-uniform electromagnetic fields and coil mismatches
Solution Approach 1:
The patent applies preliminary action by performing geometric corrections and offset compensations during the coil design phase rather than during operation. The geometric correction array and offset values are calculated in advance based on simulated or measured non-uniformities, allowing the system to achieve high measurement precision without adding complex real-time correction mechanisms.
Solution Approach 2:
The patent changes geometric parameters of the receiver coils through the geometric correction array, which adjusts coil positions and dimensions to compensate for non-uniform electromagnetic fields. This parameter modification approach improves measurement precision by optimizing coil geometry to counteract field non-uniformities without increasing device complexity.
2Measurement precision
If extensive calibration and linearization procedures are implemented, then measurement precision improves, but loss of time increases during product development
Solution Approach 1:
The patent performs calibration and linearization corrections in advance during the design phase. The offset compensation values and geometric correction arrays are pre-calculated using simulation or initial measurements, eliminating the need for extensive time-consuming calibration procedures during product development while maintaining high measurement precision.
Solution Approach 2:
The patent creates a digital model or lookup table (geometric correction array) that represents the ideal corrected coil geometry. This digital copy allows the system to apply corrections through simple data lookup and application rather than through complex physical calibration procedures, significantly reducing development time while maintaining accuracy.
3Measurement precision
If geometric corrections and offset compensations are applied, then measurement precision improves, but device complexity increases due to additional correction mechanisms
Solution Approach 1:
The patent modifies geometric parameters of existing coils through the geometric correction array rather than adding physical correction mechanisms. By adjusting coil positions, dimensions, and orientations in the design phase, the system achieves high measurement precision while avoiding the complexity of additional hardware components.
Solution Approach 2:
The patent replaces physical mechanical correction mechanisms with computational methods. The geometric correction array and offset compensations are implemented through software algorithms that process coil geometry data and calculate position measurements, substituting complex mechanical adjustment systems with simpler computational approaches.
4Measurement precision
If receiver coils are optimized for uniform field response, then measurement precision improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent calculates optimal geometric parameters for receiver coils using the geometric correction array, which compensates for expected manufacturing variations and field non-uniformities. By designing coils with pre-calculated geometric corrections built in, the system achieves high measurement precision while accommodating normal manufacturing tolerances without requiring excessive manufacturing precision.
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 optimized coil design significantly reduces position sensing errors, achieving accuracy within 0.5% of full scale, a six-fold improvement over traditional methods, and eliminates the need for extensive calibration and linearization, thereby shortening product development time.
Implementation Method 1
a transmit coil is used to induce eddy currents in a metallic target
Implementation Method 2
induce eddy currents in a metallic target that is sliding or rotating above a set of receiver coils
Implementation Method 3
Receiver coils receive the magnetic field generated from eddy currents and the transmit coils
Data Source
AI summary
In some embodiments, optimizing a coil design is provided. In particular, a method of providing an optimized position locating sensor coil design includes receiving a coil design, the coil design including geometric positions of a transmit coil and geometric positions of receive coils; linearizing one or more of the receive coils; and offset compensating the one or more of the receive coils. The linearization determines a geometric correction array for adjusting the geometric position of one of the receive coils. The offset correction includes determining a geometric shift to shift the geometric position of the one of the receive coils.