Inductive Linear-Position Sensor Sense Coil Topology
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Solution Overview
Problem
Existing linear-position sensing technologies face challenges in accurately measuring the linear position and direction of movement of a target due to limitations in sensitivity and complexity, particularly in valve applications where precise positioning is critical.
Innovation Solution
The development of an inductive linear-position sensor that utilizes a configuration of oscillator coils, sense coils, and an integrated circuit to generate an output signal indicative of the target's linear position and movement direction, featuring sense coils arranged in two planes with multiple passes around loops, enhancing sensitivity and accuracy through sinusoidal modulation of induced signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sense coils are arranged in two planes with multiple passes around loops, then sensitivity and measurement precision are improved, but device complexity increases
Solution Approach 1:
The sense coils are arranged in two different planes (first plane and second plane) with multiple passes around loops in each plane. This spatial arrangement in multiple dimensions creates sinusoidal modulation patterns that enhance sensitivity and accuracy for determining linear position and direction of movement, while the planar configuration keeps the implementation relatively simple
Solution Approach 2:
The sensing system is divided into multiple segments: oscillator coils in a first plane, sense coils in a second plane, with each having specific loop configurations. This segmentation allows independent optimization of each coil's contribution to the sinusoidal modulation, improving overall measurement precision without requiring a completely complex integrated design
2Measurement precision
If sinusoidal modulation is used to enhance sensitivity, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system generates sinusoidal modulation signals automatically through the interaction between oscillator coils and sense coils arranged in two planes. The modulation is produced self-organically by the electromagnetic coupling between coils as the target moves, without requiring external modulation circuits or complex signal generation hardware, thus improving precision while maintaining simplicity
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 configuration allows for more sensitive and accurate linear-position sensing, enabling precise measurement of target movement while maintaining a simpler and cost-effective design compared to multi-plane configurations.
Implementation Method 1
If a coil of wire is placed in a changing magnetic field, a voltage will be induced at ends of the coil of wire. In a predictably changing magnetic field, the induced voltage will be predictable (based on factors including the area of the coil affected by the magnetic field and the degree of change of the magnetic field).
Data Source
AI summary
An apparatus for inductive linear-position sensing is disclosed. An apparatus may include a support structure and an electrically conductive material defining a continuous path for electrical current to flow between a first location and a second location. The continuous path may include: a first path portion defining a first spiraling path for the electrical current to flow in a clockwise direction around a first axis; a second path portion laterally spaced from the first path portion and defining a second spiraling path for the electrical current to flow in a counter-clockwise direction around a second axis; a first coupling portion coupling an inner portion of the first path portion to an inner portion of the second path portion; and a second coupling portion coupling an outer portion of the second path portion to an outer portion of the first path portion. Related systems, devices, and methods are also disclosed.