Position Detection Device with Dual Coil Modules
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Solution Overview
Problem
Existing position detection systems for vehicles and linear motors face challenges in accurately determining position due to unknown or varying structural distances between sensor elements, leading to irregular movements and inability to control smooth movement.
Innovation Solution
A position detection device with two detecting modules arranged side-by-side on a carrier, each comprising an energizing coil and a receiving coil, outputs position signals to measure the distance between the modules, allowing for precise determination of the reference distance and compensation for changes in structural distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sensor coils are arranged at a distance for structural reasons, then device structure is simplified, but position determination precision deteriorates due to unknown or changing distances
Solution Approach 1:
A reference object with known geometry is introduced as an intermediary between the sensor coils and the position determination process. This reference object carries identification markers that enable the system to measure and compensate for the actual distance between sensor coils, thereby maintaining position precision despite structural simplifications that create unknown distances
Solution Approach 2:
The system replaces direct mechanical measurement of sensor coil distances with an optical/electromagnetic measurement approach. By using identification markers detected by sensor coils to calculate distances, the system substitutes physical distance measurement with signal-based measurement, enabling precise position determination without requiring mechanically precise sensor placement
2Ease of operation
If continuous periodic voltage signal is applied to sensor coil, then continuous measuring signal is provided, but position detection time increases due to envelope determination over several periods
Solution Approach 1:
The system performs preliminary measurement of the distance between sensor coils using identification markers before position detection. This pre-established distance information serves as a reference that enables direct position calculation from single-period signals, eliminating the need for time-consuming envelope determination over multiple periods while maintaining continuous detection capability
3Adaptability or versatility
If distance between sensor coils changes during operation, then system adapts to environmental conditions, but position determination precision deteriorates due to unknown distance changes
Solution Approach 1:
The system implements feedback by continuously measuring the distance between sensor coils through identification markers on the reference object. This measured distance information is fed back to the control unit, which uses it to compensate for thermal expansion or contraction effects, thereby maintaining position determination precision despite environmental changes
Solution Approach 2:
The system dynamically adjusts the position calculation parameters based on the measured distance between sensor coils. When temperature changes cause distance variations, the system updates its internal distance parameter to reflect the actual spacing, ensuring accurate position determination across different operating conditions
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
Enables precise position detection and smooth movement by correlating position signals with known reference distances, effectively addressing the issue of unknown or changing structural distances and improving control over vehicle or armature movement.
Implementation Method 1
Each detecting module comprises an energizing coil and a receiving coil assigned to the energizing coil
Data Source
AI summary
A position detection device for detecting a position of a movable element in a drive device comprises a carrier having two detecting modules for detecting a position of the movable element, the detecting modules being arranged side-by-side at a predetermined distance and without overlapping. Each detecting module comprises an energizing coil and a receiving coil assigned to the energizing coil and comprising a geometry having one period. The detecting modules are configured to output a position signal when detecting the movable element, so that during a shift of the movable element along the two detecting modules over the predefined distance this distance may be measured as a reference distance on the basis of the position signals.