Inductive Detector Winding Pitch Segmentation
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Solution Overview
Problem
Existing inductive position detectors face challenges in achieving high precision and linearity in tight space constraints due to closely grouped windings, which result in interaction or cross-talk and increased complexity and cost, especially in applications requiring multiple targets and frequencies.
Innovation Solution
The design incorporates a transmit and receive winding system with a passive circuit comprising windings of different pitches, where a fine pitch portion and a coarse pitch portion of the winding interact with corresponding receive windings to measure position, allowing for precise position detection while minimizing space and cost, and includes electronic circuitry for signal processing and calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If windings are arranged closely together to fit tight space constraints, then space utilization is improved, but cross-talk between windings increases and measurement performance deteriorates
Solution Approach 1:
The detector is divided into multiple independent winding groups, each group containing transmit and receive windings that are spatially separated. This segmentation isolates the magnetic fields of different winding groups, reducing cross-talk while maintaining compact overall detector dimensions.
Solution Approach 2:
The windings are arranged in three-dimensional space with separation along the measurement axis rather than being closely grouped in a single plane. This dimensional arrangement reduces magnetic field interaction between windings while preserving the detector's compact footprint.
2Adaptability or versatility
If multiple targets with different resonant frequencies are used to measure multiple positions, then measurement capability is improved, but device complexity and cost increase
Solution Approach 1:
A single detector design with multiple winding groups can measure multiple positions simultaneously by utilizing the different resonant frequencies of multiple targets. The electronic circuit processes signals from all winding groups to determine positions of multiple targets, making the detector universal for multi-position measurement applications.
Solution Approach 2:
Multiple measurement functions for different positions are combined into a single detector unit with integrated winding groups and electronic circuitry. This merging approach allows simultaneous measurement of multiple positions without requiring separate detector systems, reducing overall complexity.
3Volume of moving object
If winding size is reduced to fit tight space constraints, then space utilization is improved, but target distance must be reduced and linearity becomes more difficult to achieve
Solution Approach 1:
The detector uses multiple smaller winding groups distributed in space rather than one large winding. Each small winding group maintains good linearity characteristics, and their combined output achieves high-resolution measurement without requiring large individual winding sizes.
Solution Approach 2:
The winding groups are arranged in three-dimensional space with separation along the measurement axis. This spatial arrangement allows each winding to maintain appropriate size for good linearity while the overall detector remains compact, resolving the conflict between winding size and detector volume.
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 enables compact, high-precision position measurement with reduced cross-talk and complexity, achieving accurate position detection in various topologies with improved linearity and cost-effectiveness, particularly suitable for rotary and linear detectors.
Implementation Method 1
the mutual inductance between the transmit winding and the receive winding is a function of the relative displacement of the passive circuit along the measurement axis
Implementation Method 2
a passive circuit comprising a winding in electrical series with a capacitor
Data Source
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AI summary
An inductive detector arranged to measure position along a axis comprising: a transmit winding; a receive winding; a passive circuit comprising a winding in electrical series with a capacitor; wherein: the mutual inductance between the transmit winding and the receive winding is a function of the relative displacement of the passive circuit along the measurement axis; a first portion of one of the windings is wound on a first pitch and a second portion of the same winding is wound on a second pitch whose extent is greater than the first pitch.