Position Measuring Device Signal Period Adaptation
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Solution Overview
Problem
Existing position-measuring devices face challenges in varying the signal period of sinusoidal analog scanning signals to accommodate different scanning principles, leading to suboptimal signal quality due to either excessively large or small signal periods, which can be beyond the processing capabilities of conventional electronics.
Innovation Solution
A position-measuring device with a module that includes a conversion unit and a digital-to-analog converter to generate sinusoidal digital output signals with varied signal periods, adjusting the operating mode based on the frequency of the analog scanning signals to ensure optimal processing, particularly by increasing the output rate and reducing word width at higher frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If magnetic or inductive scanning principles are used with large grating periods, then mounting tolerances are relaxed, but the signal period becomes too large for optimal electronic processing
Solution Approach 1:
The patent changes the signal period parameter by using a digital signal processing approach that generates synthetic analog output signals with a reduced signal period compared to the original scanning signals, allowing optimal electronic processing while maintaining the benefits of large grating periods for mounting tolerance
2Manufacturing precision
If optical scanning principles are used with small grating periods, then small signal periods are achieved, but the signal period becomes too small for conventional electronics to process
Solution Approach 1:
The patent applies parameter change by digitally processing the high-frequency scanning signals and generating synthetic output signals with a varied (increased) signal period that is suitable for conventional electronic processing, thus bridging the gap between optical scanning capabilities and electronic processing limitations
3Productivity
If the signal period is varied using conventional methods, then the output signal frequency is increased, but the processing quality deteriorates at high frequencies
Solution Approach 1:
The patent implements a dynamic processing approach where the conversion unit adapts its operation based on the input signal frequency, using frequency-dependent processing strategies that maintain high signal quality across a wide range of output frequencies by adjusting the digital processing parameters accordingly
Solution Approach 2:
The patent introduces digital signal processing as an intermediary between the analog scanning signals and the final analog output signals, allowing for precise control and optimization of the signal period variation while maintaining high signal quality through digital algorithms
Data Source
AI summary
A position-measuring device includes a module configured to vary a signal period of a position-dependent sinusoidal analog scanning signal. A conversion unit is configured to receive the sinusoidal analog scanning signal and to generate therefrom a sinusoidal digital output signal having a varied signal period compared to the sinusoidal analog scanning signal. A digital-to-analog converter is configured to generate, from the sinusoidal digital output signal, a sinusoidal analog output signal having a varied signal period. The conversion unit is configured to change an operating mode in dependence upon a frequency of the sinusoidal analog scanning signal in such a way that in a case of higher frequencies of the sinusoidal analog scanning signal, the sinusoidal digital output signal is fed to the digital-to-analog converter at a higher output rate and with a smaller word width than in a case of lower frequencies of the sinusoidal analog scanning signal.