Position Measuring Device Signal Error Correction
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Solution Overview
Problem
Incremental position measuring devices face limitations in detecting signal errors early, leading to sudden system failures and preventing preventive maintenance, as they reach standard signal processing unit boundaries, making it difficult to adjust detector units and resulting in immediate emergency stops.
Innovation Solution
A position measuring device with a signal processing unit that includes offset, amplitude, and phase correction units, along with a surveillance unit to detect signal errors and switch off correction units when limits are reached, allowing for early signaling of errors and maintaining system functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal processing units with correction functions are used to maintain signal quality, then measurement precision is improved, but device complexity increases and early error detection capability deteriorates
Solution Approach 1:
The signal processing unit is segmented into separate correction units (offset correction unit, amplitude correction unit, phase correction unit) that can be independently controlled. This segmentation allows the system to apply corrections selectively and switch off individual correction functions when their corresponding signal quality limits are reached, thereby maintaining measurement precision while managing device complexity and enabling early error detection.
2Measurement precision
If correction units continuously optimize detector signals, then measurement precision is maintained, but the ability to detect signal errors early deteriorates
Solution Approach 1:
A surveillance unit continuously monitors the quality of detector signals and provides feedback to the correction units. When signal quality parameters (offset, amplitude, phase) reach predetermined limits, the surveillance unit triggers a switching-off of the corresponding correction unit. This feedback mechanism enables early detection of signal errors while maintaining measurement precision through continuous correction until the limit is reached.
3Productivity
If standard signal processing boundaries are reached, then device operation continues, but sudden system failures occur preventing preventive maintenance
Solution Approach 1:
The surveillance unit performs preliminary detection of signal quality degradation by continuously monitoring detector signals and comparing them against predetermined quality limits. When a limit is approached or reached, the system takes preliminary action by switching off the corresponding correction unit and generating a warning signal, allowing preventive maintenance to be performed before sudden system failures occur, thus maintaining continuous operation while ensuring system stability.
Data Source
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AI summary
The present invention relates to a position measuring device comprising a scale carrier (14) with a measuring scale (16, 17), a scanning unit (12) which is movably arranged in a measuring direction relative to the measuring scale (16, 17) for generating position-dependent scanning signals (S0, S90, R) by scanning the measuring scale (16, 17), a signal processing unit (20, 120) for processing the scanning signals (S0, S90, R) into position signals (P0, P90, PR), and a signal interface (50) via which the position signals (P0, P90, PR) can be output to downstream electronics (80). The signal processing unit (20, 120) includes at least one correction unit (20.1, 20.2, 20.3; 120.1, 120.2, 120).3) arranged with which at least one signal error of at least one sampling signal (S0, S90, R) can be corrected, and a monitoring unit (30, 130) with which the reaching of a limit value of the signal error can be detected and subsequently at least the correction unit (20.1, 20.2, 20.3; 120.1, 120.2, 120.3) that triggers the event can be deactivated. The invention further relates to a method for operating a position measuring device.