Inductive Scanning Element Radial Connecting Conductors
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Solution Overview
Problem
Existing inductive position measuring devices face challenges in achieving precise, compact, and cost-effective measurement of angular positions between rotating scale elements, particularly in high-speed applications like robot drives, where current solutions are inefficient and prone to interference.
Innovation Solution
A scanning element with a multi-layer circuit board design featuring detector units with periodic receiver tracks and connecting conductor tracks that run radially and circumferentially, allowing for precise angular position measurement by generating phase-shifted signals through time-changing excitation currents, while minimizing crosstalk and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple receiver tracks are arranged on a circuit board to measure angular positions of multiple scale elements, then measurement capability is improved, but device complexity and susceptibility to interference increase
Solution Approach 1:
The circuit board is divided into multiple detector units (first detector unit with first and third receiver tracks, second detector unit with second and fourth receiver tracks), each independently measuring angular positions of different scale elements. This segmentation allows multiple measurement functions while maintaining manageable complexity through modular design.
Solution Approach 2:
Receiver tracks are arranged in different radial dimensions and layers on the circuit board. The first and third receiver tracks are arranged in different radial dimensions, while the second and fourth receiver tracks are arranged in different radial dimensions. This spatial arrangement in multiple dimensions enables simultaneous measurements without excessive planar complexity.
2Measurement precision
If receiver tracks are arranged radially to improve angular resolution, then measurement precision is improved, but crosstalk and interference between tracks increase
Solution Approach 1:
The receiver tracks are segmented into different detector units with dedicated excitation and receiver tracks. Each detector unit independently processes signals from its own tracks, preventing crosstalk between units. The first detector unit handles first and third receiver tracks, while the second detector unit handles second and fourth receiver tracks.
Solution Approach 2:
Connection conductor tracks serve as intermediaries that radially connect the periodically arranged receiver conductor tracks to electronic components. These intermediaries are specifically designed to minimize interference and crosstalk while maintaining signal integrity, acting as controlled pathways that isolate signal flows between different track groups.
3Volume of moving object
If compact circuit board design is used to reduce device size, then device compactness is improved, but manufacturing precision requirements increase
Solution Approach 1:
The circuit board utilizes three-dimensional spatial arrangement with receiver tracks positioned in different radial dimensions and layers. This allows compact packaging of multiple measurement functions within a small footprint while maintaining adequate spacing between tracks to reduce manufacturing precision requirements compared to planar arrangements.
Solution Approach 2:
Multiple detector units and their associated tracks are nested within a compact circuit board structure. The first and second detector units, along with their respective excitation and receiver tracks, are integrated in a nested arrangement that maximizes space utilization while maintaining functional independence.
4Reliability
If connecting conductor tracks run radially to reduce interference, then signal quality is improved, but device complexity increases
Solution Approach 1:
The connection conductor tracks serve multiple functions: they radially connect receiver conductor tracks to electronic components, minimize interference through their radial geometry, and provide structured signal pathways that simplify overall device architecture. This multi-functionality reduces the need for additional dedicated components.
Solution Approach 2:
The connection conductor tracks are merged with the circuit board structure itself, integrating the connection function into the board's radial geometry rather than adding separate external connection elements. This merging reduces device complexity while maintaining signal quality.
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 solution enables precise and cost-effective measurement of angular positions between rotating scale elements, improving resolution and reducing interference, making it suitable for high-speed applications like robot drives.
Implementation Method 1
When a temporally varying electrical excitation current is applied to the excitation tracks, signals dependent on the angular position are generated in the receiver coils during the relative rotation between the rotor and stator
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a scanning element (1) for an inductive position measuring device comprising a printed circuit board (1.1) having a geometric center plane (M) located between two detector units (1.11, 1.12). The detector units (1.11, 1.12) comprise receiver conductors (1.1121, 1.1241), wherein the first detector unit (1.11) further comprises a first connecting conductor (1.116) which is electrically connected to one of the first receiver conductors (1.1121) and extends with a radial component through the first gap (U1). The second detector unit (1.12) comprises a second connecting conductor (1.126) which is electrically connected to one of the fourth receiver conductors (1.1241) and extends with a radial component through the second gap (U2).