Inductive Angle Sensor Layout for Precise Compact Position Sensing
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Solution Overview
Problem
Existing inductive angle measuring devices face challenges in achieving accurate and compact design while maintaining cost-effectiveness, particularly in the configuration of sensing elements with receiving conductive paths that generate precise positional signals.
Innovation Solution
The sensing element for an inductive angle measuring device is designed with specific arrangements of detector units and receiving conductive paths, including varying arc lengths and gap lengths, and amplitudes, which are connected to form sum signals and processed by electronic components to determine angular position accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple detector units with periodic receiving conductive paths are arranged along concentric circular lines with different radii, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The sensing element is divided into four detector units (first, second, third, fourth) arranged along concentric circular lines. Each detector unit contains receiving conductive paths that are segmented and periodic, allowing independent signal generation. This segmentation enables precise angular position determination through multiple signal sources while managing structural complexity through modular design.
Solution Approach 2:
The receiving conductive paths are arranged in multiple concentric circular lines with different radii, adding a radial dimension to the detector unit configuration. This dimensional arrangement allows the sensing element to capture angular position information from multiple radial distances simultaneously, improving measurement precision without proportionally increasing complexity.
2Manufacturing precision
If the first and second receiving conductive paths are arranged with specific gap lengths and arc lengths, then manufacturing precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent specifies precise geometric parameters for the receiving conductive paths, including gap lengths (first gap length, second gap length), arc lengths (first arc length, second arc length, third arc length, fourth arc length), and periodicities (first period length, second period length). These parameter changes enable accurate angular position determination while the parameters are designed to be multiples of period lengths, facilitating standardized manufacturing processes.
Solution Approach 2:
Different detector units have different local geometric characteristics - the first and third receiving conductive paths have specific gap lengths and arc lengths, while the second and fourth receiving conductive paths have different gap lengths and arc lengths. This local quality differentiation allows each detector unit to contribute uniquely to the overall measurement precision while maintaining manufacturability through localized feature definition.
3Volume of moving object
If detector units are arranged compactly with periodic curves, then volume is reduced, but measurement precision may deteriorate
Solution Approach 1:
The four detector units are nested along concentric circular lines with different radii, creating a compact radial arrangement. The receiving conductive paths are periodic curves that fit within the circular geometry, allowing the sensing element to maintain a compact volume while the multiple radial layers provide sufficient separation for accurate angular position measurement.
Solution Approach 2:
The receiving conductive paths are designed with periodic curves having specific period lengths (first period length for odd detector units, second period length for even detector units). This periodic structure allows the compact detector units to generate distinguishable signals that maintain measurement precision despite the compact arrangement, as the periodicity provides unique signal characteristics for each detector unit.
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 enables precise angular position measurement with improved accuracy and compactness, while maintaining cost-effectiveness by optimizing the layout of receiving conductive paths and electronic components.
Implementation Method 1
When a time-varying electrical excitation current is applied to the excitation tracks, signals dependent on the position are generated in the receiving tracks during the relative movement between the scale element and the sensing element
Data Source
AI summary
A sensing element for an inductive angle measuring device includes a first, a second, a third, and a fourth receiving conductive path. The second receiving conductive path extends over a second arc length, and the fourth receiving conductive path extends over a fourth arc length. The course of the first receiving conductive path and the third receiving conductive path is periodic along a first circular line. The course of the second receiving conductive path and the fourth receiving conductive path is periodic along a second circular line. The second receiving conductive path and the fourth receiving conductive path are arranged such that there is a first gap with a first gap length and a second gap with a second gap length between them in the circumferential direction. The first gap length and the second gap length are of different sizes, or the second arc length and the fourth arc length are of different sizes.